topic Re: Cascading Dropdown in alfresco share in Alfresco Archive

Cascading Dropdown in alfresco share

joshijimit — Thu, 10 Mar 2011 11:49:51 GMT

Hi All,I have a requirement in my project to implement cascading dropdown in alfresco share.I have followed the below link of jean barmash's blog and implemented cascading dropdown in alfresco explorer.http://blogs.alfresco.com/wp/jbarmash/2008/08/18/implementing-cascading-dropdowns-for-editing-prop

Re: Cascading Dropdown in alfresco share

joshijimit — Mon, 14 Mar 2011 04:49:45 GMT

Hi Alfresco team,

Can you please share some ideas on how could I be able to implement cascading dropdown in alfresco share??
What I did so far is, I have added two dropdowns in share-config-custom.xml like below
————————————————————————————————————————————–
<field id="ccdroducta" label="My Product">
                <control template="controls/selectone.ftl">
                </control>

</field>
<field id="ccd:trima" label="My Dependent Product">
                <control template="controls/selectone.ftl">
                </control>
</field>
————————————————————————————————————————————–

And I have filled "My Product" dropdown from custom constraint class assigned in content model. and also register ONCHANGE event on both the dropdowns
by adding ONCHANGE event in "controls/selectone.ftl" file like below. I can pass the selected value in dropdown to this function as well.
————————————————————————————————————————————–
<select id="${fieldHtmlId}" name="${field.name}" tabindex="0" ONCHANGE="fetchDependentList(${field.name},this.options[this.selectedIndex].value,this.options[this.selectedIndex].value);"
     ……….Rest of the code………..
————————————————————————————————————————————–

But Now the problem is, Shall I call WebService from java script and get the JSON response and fill the dependent dropdown?

Or should I change my approach or modify something in order to achieve it??
Your help would be of grt help here as I haven't found anyone who has implemented the kind of fuctionality..

Regards,
Jimit

Re: Cascading Dropdown in alfresco share

pavaniakella — Wed, 23 Mar 2011 11:07:49 GMT

Hi Jimit,

I am also trying to implement dynamic list drop down in share datalist. I am not able to get the drop down refreshed. That means it is just picking up the values that are there at the server start. In Alfresco wit is refreshed using component generator..But I don't know any implementation in share.. If you know any information on how to make the values refreshed. Please help me.

Regards,
Pavani

Re: Cascading Dropdown in alfresco share

mikeh — Wed, 23 Mar 2011 11:10:23 GMT

…
Shall I call WebService from java script and get the JSON response and fill the dependent dropdown?

Yes, that seems like a sensible approach.

Thanks,
Mike

Re: Cascading Dropdown in alfresco share

croc — Wed, 13 Apr 2011 09:19:21 GMT

Hi All,

Does anyone know where I can find th source code for this post.

I checked on the site below but there are files
http://blogs.alfresco.com/wp/jbarmash/2008/08/18/implementing-cascading-dropdowns-for-editing-properties/

Thanks,
Croc

Re: Cascading Dropdown in alfresco share

joshijimit — Wed, 13 Apr 2011 09:31:03 GMT

Hi All,

I have the source code of the above article..
If anyone wants it plese send me a PM.

Also I have made cascading dropdown works in alfrsco share but its hard to explain everything on the forum right now a I am preparing a document. Will soon update this forum with the solution.
meanwhile if anyone interested to achieve the same can contact me through PM.
Regards,
Jimit

Re: Cascading Dropdown in alfresco share

joshijimit — Fri, 15 Apr 2011 06:22:45 GMT

Hi All,

I am ready with the initial draft of the implementation. Here we go.
Step by step approach
1) Create content Model with dynamic constraint. (cascadingModel.xml)


<?xml version="1.0" encoding="UTF-8"?>
<!– Definition of new Model –>
<model name="ccd:cascadingmodel" xmlns="http://www.alfresco.org/model/dictionary/1.0">

   <!– Optional meta-data about the model –>
   <description>Cascading Model</description>
   <author>Cybage</author>
   <version>1.0</version>

   <!– Imports are required to allow references to definitions in other models –>
   <imports>
      <!– Import Alfresco Dictionary Definitions –>
      <import uri="http://www.alfresco.org/model/dictionary/1.0"
         prefix="d" />
      <!– Import Alfresco Content Domain Model Definitions –>
      <import uri="http://www.alfresco.org/model/content/1.0" prefix="cm" />
      <import uri="http://www.alfresco.org/model/system/1.0" prefix="sys" />
   </imports>

   <!– Introduction of new namespaces defined by this model –>
   <namespaces>
      <namespace uri="http://www.cascading.com/model/content/1.0"
         prefix="ccd" />
   </namespaces>

   <constraints>
      
      <constraint name="ccd:productList"
         type="com.mycomp.cascading.demo.ListOfValuesProductConstraint">
         <parameter name="allowedValues">
            <list>
            </list>
         </parameter>
      </constraint>
      <constraint name="ccd:trimList"
         type="com.mycomp.cascading.demo.ListOfValuesTrimConstraint">
         <parameter name="allowedValues">
            <list>
            </list>
         </parameter>
      </constraint>
      <constraint name="ccd:vehicleColorList"
         type="com.mycomp.cascading.demo.ListOfValuesVehicleColorConstraint">
         <parameter name="allowedValues">
            <list>
            </list>
         </parameter>
      </constraint>   
      
   </constraints>

   <types>
      <!– Enterprise-wide generic document type –>
      <type name="ccd:doc">
         <title>Cascading Document</title>
         <parent>cm:content</parent>
      </type>
   </types>
   <aspects>
      <aspect name="ccd:imageAsset">
         <title>Cascading Aspect</title>
         <properties>
            <property name="ccd:producta">
               <title>Product Name</title>
               <type>d:text</type>
               <constraints>
                  <constraint ref="ccd:productList" />
               </constraints>               
            </property>
            <property name="ccd:trima">
               <title>Trim</title>
               <type>d:text</type>   
               <constraints>
                  <constraint ref="ccd:trimList" />
               </constraints>            
            </property>
            <property name="ccd:vehicleColora">
               <title>Vehicle Color</title>
               <type>d:text</type>
               <constraints>
                  <constraint ref="ccd:vehicleColorList" />
               </constraints>               
            </property>
         </properties>
      </aspect>
   </aspects>
</model>
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2) Create constraint that loads values from database. (ListOfValuesProductConstraint)



package com.mycomp.cascading.demo;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

import javax.faces.model.SelectItem;

import org.alfresco.repo.dictionary.constraint.ListOfValuesConstraint;
import org.alfresco.web.bean.repository.Node;
import org.alfresco.web.bean.generator.BaseComponentGenerator;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class ListOfValuesProductConstraint extends SearchBasedListConstraint {

   private static Log logger = LogFactory.getLog(BaseComponentGenerator.class);

   private static final long serialVersionUID = 1;
   private Node node = null;

   public Node getNode() {
      return node;
   }

   public void setNode(Node node) {
      this.node = node;
   }

   private List<String> allowedLabels;

   public void setAllowedValues(List allowedValues) {
   }

   public void setCaseSensitive(boolean caseSensitive) {
   }

   public void initialize() {
      super.setCaseSensitive(false);
      this.loadDB();
   }

   public List<String> getAllowedLabels() {
      return this.allowedLabels;
   }

   public void setAllowedLabels(List<String> allowedLabels) {
      this.allowedLabels = allowedLabels;
   }

   public List<SelectItem> getSelectItemList() {
      List<SelectItem> result = new ArrayList<SelectItem>(this
            .getAllowedValues().size());
      for (int i = 0; i < this.getAllowedValues().size(); i++) {
         result.add(new SelectItem((Object) this.getAllowedValues().get(i),
               this.allowedLabels.get(i)));
      }
      return result;
   }

   protected void loadDB() {

      String driverName = "org.gjt.mm.mysql.Driver";
      String serverName = "localhost";
      String mydatabase = "cascading";
      String username = "root";
      String password = "root";

      List<String> av = new ArrayList<String>();
      List<String> al = new ArrayList<String>();
      Connection connection = null;
      Statement stmt = null;
      ResultSet rs = null;
      

         try {

            Class.forName(driverName);
            String url = "jdbc:mysql://" + serverName + "/" + mydatabase;
            connection = DriverManager.getConnection(url, username,
                  password);
            stmt = connection.createStatement();
            rs = stmt.executeQuery("select distinct product from imageasset");
            av.add("–Select–");
            while (rs.next()) {
               av.add(rs.getString("product"));
               //al.add(rs.getString("label"));
            }
         } catch (Exception e) {
         } finally {
            try {
               if (rs != null)
                  rs.close();
               if (stmt != null)
                  stmt.close();
               if (connection != null && !connection.isClosed())
                  connection.close();
            } catch (SQLException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
            }
         }

         super.setAllowedValues(av);
         //this.setAllowedLabels(al);
      }
   
}
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3) Create custom template of Alfresco Share to register onChange event call java backed web script on change of values in dropdown. (selectoneCustom.ftl)
Note: Needs to create separate template for each parent dropdown as we are passing child reference in script and make an Ajax call to fill dependent dropdown.



<#include "/org/alfresco/components/form/controls/common/utils.inc.ftl" />
<script language="JavaScript" type="text/javascript">

function getProduct(frm,selectedValue) {

   var xmlhttp;
   
   if (window.XMLHttpRequest) {
         xmlhttp = new XMLHttpRequest();
   } else {
         xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
   }
   
   xmlhttp.onreadystatechange = function() {
      var ticket;
      
      if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
         
            
            //var jsonString = xmlhttp.responseText;                        
            //var myFirstJSON = eval('(' + jsonString + ')'); 
            
            var theSel = frm.prop_ccd_trima;                     
            theSel.disabled = false;            
            
            removeAllOptions(theSel);      
            //alert(selectedValue +" "+ myFirstJSON[0][0]);            
            //insertOldSchool(theSel,myFirstJSON[0][0],myFirstJSON[0][0]);
            
            var resp = xmlhttp.responseText;
            var respArr = resp.split(',');
            for(var i=0;i<respArr.length;i++){
               insertOldSchool(theSel,respArr[i],respArr[i]);
            }
            
            
      }      
   };
   xmlhttp.open("GET","http://jimitj/alfresco/service/demo/cascading?field=trim&key=product&value='+selectedValue ,true);

   xmlhttp.send();

}

</script>

<#if field.control.params.optionSeparator??>
   <#assign optionSeparator=field.control.params.optionSeparator>
<#else>
   <#assign optionSeparator=",">
</#if>
<#if field.control.params.labelSeparator??>
   <#assign labelSeparator=field.control.params.labelSeparator>
<#else>
   <#assign labelSeparator="|">
</#if>

<div class="form-field">
   <#if form.mode == "view">
      <div class="viewmode-field">
         <#if field.mandatory && !(field.value?is_number) && field.value?string == "">
            <span class="incomplete-warning"><img src="${url.context}/res/components/form/images/warning-16.png" title="${msg("form.field.incomplete")}" /><span>
         </#if>
         <#if field.control.params.options?? && field.control.params.options != "">
         <span class="viewmode-label">${field.label?html}:</span>         
         <#if field.value?string == "">
            <#assign valueToShow=msg("form.control.novalue")>            
         <#else>
            <#assign valueToShow=field.value>
            <#list field.control.params.options?split(optionSeparator) as nameValue>
               <#if nameValue?index_of(labelSeparator) == -1>
                  <#if nameValue == field.value?string || (field.value?is_number && field.value?c == nameValue)>
                     <#assign valueToShow=nameValue>
                     <#break>
                  </#if>
               <#else>
                  <#assign choice=nameValue?split(labelSeparator)>
                  <#if choice[0] == field.value?string || (field.value?is_number && field.value?c == choice[0])>
                     <#assign valueToShow=msgValue(choice[1])>
                     <#break>
                  </#if>
               </#if>
            </#list>
         </#if>         
         <span class="viewmode-value">${valueToShow?html}</span>
         </#if>
      </div>
   <#else>
      
      <#if field.control.params.options?? && field.control.params.options != "">
         <label for="${fieldHtmlId}">${field.label?html}:<#if field.mandatory><span class="mandatory-indicator">${msg("form.required.fields.marker")}</span></#if></label>   
         <select id="${fieldHtmlId}" name="${field.name}" tabindex="0" ONCHANGE="getProduct(this.form,this.options[this.selectedIndex].value);"
               <#if field.description??>title="${field.description}"</#if>
               <#if field.control.params.size??>size="${field.control.params.size}"</#if> 
               <#if field.control.params.styleClass??>class="${field.control.params.styleClass}"</#if>
               <#if field.control.params.style??>style="${field.control.params.style}"</#if>
               <#if field.disabled  && !(field.control.params.forceEditable?? && field.control.params.forceEditable == "true")>disabled="true"</#if>>
               <#list field.control.params.options?split(optionSeparator) as nameValue>
                  <#if nameValue?index_of(labelSeparator) == -1>
                     <option value="${nameValue?html}"<#if nameValue == field.value?string || (field.value?is_number && field.value?c == nameValue)> selected="selected"</#if>>${nameValue?html}</option>
                  <#else>
                     <#assign choice=nameValue?split(labelSeparator)>
                     <option value="${choice[0]?html}"<#if choice[0] == field.value?string || (field.value?is_number && field.value?c == choice[0])> selected="selected"</#if>>${msgValue(choice[1])?html}</option>
                  </#if>
               </#list>
         </select>
         <@formLib.renderFieldHelp field=field />
      <#else>              
        
      </#if>
   </#if>
</div>
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4) Share-config-custom.xml to show properties in alfresco share.



config  evaluator="node-type" condition="cm:content">
      <forms>
         <!– Default form configuration used on the document details and edit metadata pages –>
         <form>
            <field-visibility>          
              
               
               <show id="ccd:producta"/>
               <show id="ccd:trima"/>
               <show id="ccd:vehicleColora"/>
               
              
            </field-visibility>
             <appearance>            
             <field id="ccd:producta" label="Product">
                <control template="controls/selectoneCustom.ftl">                   
                </control>                

             </field>
             <field id="ccd:trima" label="Trim">
                <control template="controls/selectoneDepenedentDisable.ftl">                   
                </control>
             </field>
             <field id="ccd:vehicleColora" label="Vehicle Color">
                <control template="controls/selectoneDisable.ftl">                   
                </control>
             </field>
            
          </appearance>

         </form>

         <!– Document Library pop-up Edit Metadata form –>
         <form id="doclib-simple-metadata">
            <field-visibility>
            
               <show id="ccd:producta"/>
               <show id="ccd:trima"/>
               <show id="ccd:vehicleColora"/>
              
            </field-visibility>
            <edit-form template="../documentlibrary/forms/doclib-simple-metadata.ftl" />
             <appearance>            
             <field id="ccd:producta" label="Product">
                <control template="controls/selectoneCustom.ftl">                   
                </control>                

             </field>
             <field id="ccd:trima" label="Trim">
                <control template="controls/selectoneDepenedentDisable.ftl">                   
                </control>
             </field>
             <field id="ccd:vehicleColora" label="Vehicle Color">
                <control template="controls/selectoneDisable.ftl">                   
                </control>
             </field>
            
          </appearance>
            
         </form>

         <!– Document Library Inline Edit form –>
         <form id="doclib-inline-edit">
            <field-visibility>
               
             
               <show id="ccd:producta"/>
               <show id="ccd:trima"/>
               <show id="ccd:vehicleColora"/>
            
            </field-visibility>
            
         </form>
      </forms>
     

   </config>
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5) Java backed Web script: Fetch values from database according to the value passed to it from web script call. (CascadingWebScript.java)



package com.mycomp.cascading.demo;

import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.servlet.http.HttpServletRequest;

import org.springframework.extensions.webscripts.AbstractWebScript;
import org.springframework.extensions.webscripts.WebScriptRequest;
import org.springframework.extensions.webscripts.WebScriptResponse;
import org.springframework.extensions.webscripts.servlet.WebScriptServletRequest;

public class CascadingWebScript extends AbstractWebScript {

   public void execute(WebScriptRequest req, WebScriptResponse res)
         throws IOException {

      String driverName = "org.gjt.mm.mysql.Driver";
      String serverName = "localhost";
      String mydatabase = "cascading";
      String username = "root";
      String password = "root";

      Connection connection = null;
      Statement stmt = null;
      ResultSet rs = null;

      try {

         HttpServletRequest httpReq = ((WebScriptServletRequest) req)
               .getHttpServletRequest();

         String field = httpReq.getParameter("field");
         String key = httpReq.getParameter("key");
         String value = httpReq.getParameter("value");

         System.out.println("Debugg : " + field + ":" + key + ":" + value);
         Class.forName(driverName);
         String url = "jdbc:mysql://" + serverName + "/" + mydatabase;
         connection = DriverManager.getConnection(url, username, password);
         stmt = connection.createStatement();

         rs = stmt.executeQuery("select distinct " + field
               + " from imageasset where " + key + "= '" + value + "'");

         String response = "–Select–,";
         while (rs.next()) {
            if (rs.isLast())
               response += rs.getString(field);
            else
               response += rs.getString(field) + ",";
         }

         System.out.println("Debugg : " + response);

         res.getWriter().write(response);

      } catch (Exception e) {
         e.printStackTrace();
         res.getWriter().write("Error");
      } finally {
         try {
            if (rs != null)
               rs.close();
            if (stmt != null)
               stmt.close();
            if (connection != null && !connection.isClosed())
               connection.close();
         } catch (SQLException e) {
            e.printStackTrace();
            res.getWriter().write("Error");
         }
      }
   }
}
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6) Config file for Java backed web script. (cascading.get.desc.xml)
Needs to put it under: Alfresco_Home\ tomcat\webapps\alfresco\WEB-INF\classes\alfresco\templates\webscripts\org\alfresco\demo



<webscript>
  <shortname>Cascading Web script </shortname>
  <description>Get values from database</description>
  <url>/demo/cascading?field={field}&amp;key={key}&amp;value={value}</url>
  <authentication>none</authentication>
  <format default="json">argument</format>
</webscript>
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7) Needs to put an entry to define a script as java backed webscript in web-scripts-application-context.xml under: Alfresco_Home\ tomcat\webapps\alfresco\WEB-INF\classes\alfresco
Note: Watch out Naming convension of bean id.



<bean id="webscript.org.alfresco.demo.cascading.get"
         class="com.mycomp.cascading.demo.CascadingWebScript"
         parent="webscript">
   </bean>
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8. If you are calling alfresco web script from Liferay portlet on client side (ajax call), you need to implement Apache as a proxy server(add mod_proxy module in apache) to alfresco and Liferay to make cross browser scripting enable.

Let me know if you face any problem while implementation.

Re: Cascading Dropdown in alfresco share

csabee — Mon, 30 May 2011 13:32:24 GMT

Hi there,

I've found lots of errors/problems in this implementation (I've been trying to implement this for 3 days based on your results).

Here are some problems:
1. function insertOldSchool is missing implementation
2. I don't know why, but the xmlhttp.onreadystatechange() call isn't being executed.
However, from firebug I can see the correct response
3. Lots of things are hardcoded. I don't know how to correctly implement for the webscript to get database connection settings from a file, or a model.
4. The ftl won't render the fields if their choicelist is empty. But if they aren't rendered, they won't be updated by their parents (no element found…)

Thanks,

Re: Cascading Dropdown in alfresco share

csabee — Mon, 30 May 2011 14:02:27 GMT

OK, for problem 2. here is the solution:
- Be sure, that all the .ftl -s will call function differenting in names for the field's onchange event

Here is an other problem:
removeAllOptions() isn't defined

Re: Cascading Dropdown in alfresco share

johanpi — Fri, 10 Jun 2011 17:31:18 GMT

I got everything working…

Implemented one class with parameters to use on multiple dropdown boxes.

Problem is the constraint on the sub-dropdown. It must have all the values of the constraints and initially is disabled but filled with all the values.

After selecting the fist dropdown it filters the second and works.
Problem every time it is edited the second dropdown have all the values…

Just some feedback.
Regards

Re: Cascading Dropdown in alfresco share

joshijimit — Mon, 05 Sep 2011 17:38:49 GMT

Hi All,

I have implemented it successfully and its running on production server without any problem.
Send me PM if you want to get help to implement this functionality in your project.

-Jimit

Re: Cascading Dropdown in alfresco share

rfernandes — Wed, 25 Jan 2012 15:34:14 GMT

Hi Guys,

Maybe this is useful to you.

You can check the source code at the Google Code Project: http://code.google.com/p/share-form-control-dependency/

The idea is if you select value A for the main property the conditioned property (or properties) should automatically just present the corresponding allowed values.

The basic idea is to have specific form controls for Alfresco Share aware of the convention used to configure in our content model those dependencies and also have those generic form controls empowered (through client javascript) to update the corresponding form controls according to the updates made by the user on the other associated properties.

So if we define our constraints like (like the sample model on our google code project):

<constraints>
      <constraint name="sample:parentConstraint" type="LIST">
         <parameter name="allowedValues">
           <list>
               <value></value>
               <value>1 - VALUE A</value>
               <value>2 - VALUE B</value>
               <value>3 - VALUE C</value>
           </list>
         </parameter>
      </constraint>
      <constraint name="sample:constraintOne" type="LIST">
         <parameter name="allowedValues">
           <list>
               <value></value>
               <value>1 - SUBVALUE ONE AX</value>
               <value>1 - SUBVALUE ONE AY</value>
               <value>1 - SUBVALUE ONE AZ</value>
               <value>2 - SUBVALUE ONE BX</value>
               <value>2 - SUBVALUE ONE BY</value>
               <value>3 - SUBVALUE ONE CY</value>
               <value>3 - SUBVALUE ONE CZ</value>
           </list>
         </parameter>
      </constraint>
      <constraint name="sample:constraintTwo" type="LIST">
         <parameter name="allowedValues">
           <list>
               <value></value>
               <value>1.2.3 - SUBVALUE TWO ABCX</value>
               <value>2.3 - SUBVALUE TWO BCX</value>
               <value>2.3 - SUBVALUE TWO BCY</value>
               <value>2.3 - SUBVALUE TWO BCZ</value>
               <value>3 - SUBVALUE TWO CX</value>
               <value>3 - SUBVALUE TWO CY</value>
               <value>3 - SUBVALUE TWO CZ</value>
           </list>
         </parameter>
      </constraint>
   </constraints>‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

What we are saying (through convention) is that some possible values for properties one and two (to which will apply the constraintOne and constraintTwo) just should shown if the corresponding group value (the number which starts the value) was selected for the main property. If the value selected for the main property changes we will also want to change the shown values for the other properties one and two. For cases like 1.2.3 – SUBVALUE TWO ABCX in the constraintTwo, we will want the value to be available for property two for whatever value (1, 2 or 3) is selected for the main property. We also don’t want the values to be presented with the preceding main property association 1 -, 2 -, etc. And finally we want all updates to happen dynamically as user fulfills the form.

Well that’s exactly what our custom form control components do. They are generic and can be used for any equivalent case. Just build the jar, incorporate in your project and finally configure your form for Alfresco Share:

<form>
        <field-visibility>
          <show id="sample:mainProperty" />
          <show id="sample:propertyOne" />
          <show id="sample:propertyTwo" />
          <show id="sample:propertyThree" />
        </field-visibility>
        <appearance>          
          <field id="sample:mainProperty">
            <control template="/org/alfresco/components/form/controls/parent-filter-selectone.ftl">
          <control-param name="filteredProperty">sample_propertyOne,sample_propertyTwo</control-param>
            </control>
          </field>
          <field id="sample:propertyOne">
            <control template="/org/alfresco/components/form/controls/filtered-selectone.ftl"/>
          </field>
          <field id="sample:propertyTwo">
            <control template="/org/alfresco/components/form/controls/filtered-selectone.ftl"/>
          </field>
        </appearance>
      </form>‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

As you see we are using the same custom form control filtered-selectone.ftl for both conditioned properties, and another parent-filter-selectone.ftl for the main one. This last one must also receive the list of conditioned properties (separated by comma) as a control-param. As the dependency is “injected” this way at the form control configuration level this allows for us to have many separated groups of associated properties in the same form.

And with that in place the magic will happen.

Pay attention as besides the dynamic filtering of values we also have the initial numbers who define our dependency convention ripped from the values shown in the form.

The good stuff is that this is fully generic and can be used for any form, type or aspect, including search forms, data-lists types, and so on.

Finally the last advantage this pattern has is that: it allows you to manage the associated dynamic behavior of your properties, in your types and aspects, just by configuring your content model constraints (that can be located in a dynamic model for example and so allow for hot update without server restarts).

Re: Cascading Dropdown in alfresco share

akash066 — Tue, 22 Jan 2013 13:23:00 GMT

Hi Jimit,

If you have succeeded in this work then can you share the steps regarding the same.

With Regards,
Akash

Re: Cascading Dropdown in alfresco share

scouil — Tue, 12 Feb 2013 09:08:45 GMT

Hello everyone,

I've personally implemented yet another approach.
Since the main problem is that constraints and form fields are handled independently, I chose to represent the cascading dropdowns as a single property.
I define it as a basic listOfValues constraint:


<parameter name="allowedValues">
    <list>
   <value>parent1/test1</value>
   <value>parent1/test2</value>
   <value>parent1/test3</value>
   <value>parent2/test4</value>
   <value>parent2/test5</value>
    </list
</parameter
‍‍‍‍‍‍‍‍‍‍‍

All the dependancies and display is handled in a single client-side custom form component:


<#include "/org/alfresco/components/form/controls/common/utils.inc.ftl" />

<!– defines how the option list elements are separated when passed to the client –>
<#if field.control.params.optionSeparator??>
   <#assign optionSeparator=field.control.params.optionSeparator>
<#else>
   <#assign optionSeparator=",">
</#if>

<!– defines how the label list elements are separated when passed to the client –>
<#if field.control.params.labelSeparator??>
   <#assign labelSeparator=field.control.params.labelSeparator>
<#else>
   <#assign labelSeparator="|">
</#if>

<!– current value –>
<#assign fieldValue=field.value>

<!– handle default value for empty current value –>
<#if fieldValue?string == "" && field.control.params.defaultValueContextProperty??>
   <#if context.properties[field.control.params.defaultValueContextProperty]??>
      <#assign fieldValue = context.properties[field.control.params.defaultValueContextProperty]>
   <#elseif args[field.control.params.defaultValueContextProperty]??>
      <#assign fieldValue = args[field.control.params.defaultValueContextProperty]>
   </#if>
</#if>

<script type="text/javascript">
   /* string used to separate the parent from the child */
   var OPTION_SEPARATOR = "/";

   /**
   * Scripts used to split and synchronize the data between the 2 lists.
   **/
   
   /**
   *   @param stringValues: string containing the available values for the given field
   *   @returns a javascript object containing those values
   **/
   function getValsArrayFromString(stringValues) {
      //array with the options
      var valsArray = stringValues.split("${optionSeparator}");
      //remove the labels
      for (var i = 0; i < valsArray.length; i++) {
         if(valsArray.indexOf("${labelSeparator}") != -1) {
            valsArray = valsArray.substr(0,valsArray.indexOf("${labelSeparator}"));
         }
      }
      return valsArray;
   }

   /**
   * Extracts the parent value from the full value of the option
   **/
   function getParentValue(fullValue) {
      return fullValue.substr(0,fullValue.indexOf(OPTION_SEPARATOR));
   }

   /**
   * Extracts the child value from the full value of the option
   **/
   function getChildValue(fullValue) {
      return fullValue.substr(fullValue.indexOf(OPTION_SEPARATOR) + 1);
   }

   /**
   * Parent value have been changed.
   * Reset the current total value, child value and updates the available child values
   **/
   function onChangeParentValue(stringValues, parentId, childId, totalId) {
      /* get an array from the string values */
      var valsArray = getValsArrayFromString(stringValues);
      var parentValue = document.getElementById(parentId).value;
      var childSelect = document.getElementById(childId);
      
      /* empty the child select */
      while(childSelect.firstChild) {
         childSelect.removeChild(childSelect.firstChild);
      }
      
      /* fill the child select with the new values */
      for (var i = 0; i < valsArray.length; i++) {
         if ( getParentValue(valsArray) == parentValue) {
            var childValue = getChildValue(valsArray);
            var childOption = document.createElement("option");
            childOption.value = childValue;
            childOption.innerHTML = childValue;
            childSelect.appendChild(childOption);
         }
      }
   }

   /**
   * Child value have been changed.
   * Update the total value
   **/
   function onChangeChildValue(stringValues, parentId, childId, totalId) {
      var parentValue = document.getElementById(parentId).value;
      var childValue = document.getElementById(childId).value;
      document.getElementById(totalId).value = parentValue + OPTION_SEPARATOR + childValue;
   }

   /**
   * Initial filling of the parent values available
   * TODO: handle default value
   **/
   function populateSelects(stringValues, initialValue, parentId, childId, totalId) {
      /* get an array from the string values */
      var valsArray = getValsArrayFromString(stringValues);
      var parentSelect = document.getElementById(parentId);
      /* we only want to display each parent value once. This object keeps track of the already added ones */
      var uniqueParentValues = {};
      
      /* populate parent select */
      for (var i = 0; i < valsArray.length; i++) {
         var realV = getParentValue(valsArray);
         if(!uniqueParentValues.hasOwnProperty(realV)) {
            uniqueParentValues[realV] = true;
            
            /* create new option for the parent select */
            var parOption = document.createElement("option");
            parOption.value = realV;
            parOption.innerHTML = realV;
            if(realV == getParentValue(initialValue)) {
               parOption.selected = "selected";
            }
            parentSelect.appendChild(parOption);
         }
      }
      
      /* populate child select */
      onChangeParentValue(stringValues, parentId, childId, totalId);
      
      /* sets the correct child value */
      var childSelect = document.getElementById(childId);
      childSelect.value = getChildValue(initialValue);
      onChangeChildValue(stringValues, parentId, childId, totalId);
   }
</script>

<div class="form-field">
   <!– readonly mode. No action required, display the composed value as is –>
   <#if form.mode == "view">
      <div class="viewmode-field">
         <#if field.mandatory && !(fieldValue?is_number) && fieldValue?string == "">
            <span class="incomplete-warning"><img src="${url.context}/res/components/form/images/warning-16.png" title="${msg("form.field.incomplete")}" /><span>
         </#if>
         <span class="viewmode-label">${field.label?html}:</span>
         <#if fieldValue?string == "">
            <#assign valueToShow=msg("form.control.novalue")>
         <#else>
            <#assign valueToShow=fieldValue>
            <#if field.control.params.options?? && field.control.params.options != "">
               <#list field.control.params.options?split(optionSeparator) as nameValue>
                  <#if nameValue?index_of(labelSeparator) == -1>
                     <#if nameValue == fieldValue?string || (fieldValue?is_number && fieldValue?c == nameValue)>
                        <#assign valueToShow=nameValue>
                        <#break>
                     </#if>
                  <#else>
                     <#assign choice=nameValue?split(labelSeparator)>
                     <#if choice[0] == fieldValue?string || (fieldValue?is_number && fieldValue?c == choice[0])>
                        <#assign valueToShow=msgValue(choice[1])>
                        <#break>
                     </#if>
                  </#if>
               </#list>
            </#if>
         </#if>
         <span class="viewmode-value">${valueToShow?html}</span>
      </div>
   <#else>
     <!– Editable mode. –>
     <!– let's keep a single label for both fields –>
      <label for="${fieldHtmlId}">${field.label?html}:<#if field.mandatory><span class="mandatory-indicator">${msg("form.required.fields.marker")}</span></#if></label>
      <#if field.control.params.options?? && field.control.params.options != "">
       <!– first select for the parent value –>
         <select id="parent-${fieldHtmlId}" tabindex="0"
               <#if field.description??>title="${field.description}"</#if>
               <#if field.control.params.size??>size="${field.control.params.size}"</#if> 
               <#if field.control.params.styleClass??>class="${field.control.params.styleClass}"</#if>
               <#if field.control.params.style??>style="${field.control.params.style}"</#if>
               <#if field.disabled  && !(field.control.params.forceEditable?? && field.control.params.forceEditable == "true")>disabled="true"</#if>
            onchange="onChangeParentValue('${field.control.params.options}', 'parent-${fieldHtmlId}', 'child-${fieldHtmlId}', '${fieldHtmlId}');" >
         </select>
       
       <!– second select for the child value –>
         <select id="child-${fieldHtmlId}" name="${field.name}" tabindex="0"
               <#if field.description??>title="${field.description}"</#if>
               <#if field.control.params.size??>size="${field.control.params.size}"</#if> 
               <#if field.control.params.styleClass??>class="${field.control.params.styleClass}"</#if>
               <#if field.control.params.style??>style="${field.control.params.style}"</#if>
               <#if field.disabled  && !(field.control.params.forceEditable?? && field.control.params.forceEditable == "true")>disabled="true"</#if>
            onchange="onChangeChildValue('${field.control.params.options}', 'parent-${fieldHtmlId}', 'child-${fieldHtmlId}', '${fieldHtmlId}');" >
         </select>
       
       <!– hidden field containing the final value (e.g. the one sent to the server and stored in database) –>
       <input type="hidden" id="${fieldHtmlId}" name="${field.name}" />
       
         <@formLib.renderFieldHelp field=field />
      <#else>
         <div id="${fieldHtmlId}" class="missing-options">${msg("form.control.selectone.missing-options")}</div>
      </#if>
   </#if>
</div>

<!– IMPORTANT: this script must execute after the fields are created –>
<script type="text/javascript">
   setTimeout(function(){populateSelects("${field.control.params.options}", "${fieldValue}", "parent-${fieldHtmlId}", "child-${fieldHtmlId}", "${fieldHtmlId}");}, 1000);
</script>
‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Then all you have to do is override the views (there might be several of them) where your custom constraint appears to explicitely ask for it to be rendered with this new form component (let's call it "cascading-dropdowns.ftl"):


<field id="my:cascadingProperty" label-id="workflow.field.cascadingProperty">
   <control template="/org/alfresco/components/form/controls/cascading-dropdowns.ftl" />
</field>
‍‍‍‍‍

Pros:
- easy to deploy
- relatively standard, so there are few chances that a new version of Alfresco breaks it

Cons:
- The list of available values can be huge depending on your needs.
- The value stored in database isn't 2 clean fields but a single one you'd have to parse if you retrieve it programatically/via CMIS/etc.
- I have no idea if you could write a similar component to override its display in alfresco explorer. The current one only works for Share.

There still is room for improvement (on the size parameter or the field title/labels) but I hope you get the idea and can improve it further to meet your needs.

Re: Cascading Dropdown in alfresco share

alexsolomatin — Tue, 12 Feb 2013 10:44:00 GMT

Hi everyone,

Has anybody tried to use such custom controls in Advanced Search? I implemented a solution when all dynamic constraints are defined in JSON files which are loaded by AJAX calls when rendering custom controls. Everything is fine in the latest Chrome and Firefox but I have a strange problem with IE on the Advanced Search page. It looks like no any javascripts defined in the custom cotrol template are loaded, so when the change event occurs, the browser can't just find the event handler. By the way, everything is OK on the Edit properties page.

I discoverd that almost all controls on the Advanced Search page are loaded by the YUI library. Maybe there are some differences in the implementation for IE and the rest of browsers… Has anyone had similar problems?

Re: Cascading Dropdown in alfresco share

scouil — Fri, 15 Feb 2013 10:53:00 GMT

Hello,

Good point there. IE was beyond my testing scope (lucky me!) but it is a troubling issue.
I noticed something was different in the advanced search since the script line at the end of my file was triggered BEFORE the html was injected.
But I didn't get into it more deeply and simply delayed my script call.

I guess a solution would be to dynamically create the onchange events in javascript. This will ensure that the closures are correctly set.

I'll repost the new code if it succeeds.

Re: Cascading Dropdown in alfresco share

scouil — Fri, 15 Feb 2013 12:31:50 GMT

As expected, defining the onchange event in javascript fixes it.
I ended up refactoring a bit my code and spliting it into 2 files:

/org/alfresco/components/form/controls/cascading-dropdowns.ftl :


<#include "/org/alfresco/components/form/controls/common/utils.inc.ftl" />
<#include "/org/alfresco/components/form/controls/common/cascadingDropdownUtils.inc.ftl" />

<!– current value –>
<#assign fieldValue=field.value>

<!– handle default value for empty current value –>
<#if fieldValue?string == "" && field.control.params.defaultValueContextProperty??>
   <#if context.properties[field.control.params.defaultValueContextProperty]??>
      <#assign fieldValue = context.properties[field.control.params.defaultValueContextProperty]>
   <#elseif args[field.control.params.defaultValueContextProperty]??>
      <#assign fieldValue = args[field.control.params.defaultValueContextProperty]>
   </#if>
</#if>

<div class="form-field">
   <!– readonly mode. No action required, display the composed value as is –>
   <#if form.mode == "view">
      <div class="viewmode-field">
         <#if field.mandatory && !(fieldValue?is_number) && fieldValue?string == "">
            <span class="incomplete-warning"><img src="${url.context}/res/components/form/images/warning-16.png" title="${msg("form.field.incomplete" )}" /><span>
         </#if>
         <span class="viewmode-label">${field.label?html}:</span>
         <#if fieldValue?string == "">
            <#assign valueToShow=msg("form.control.novalue" )>
         <#else>
            <#assign valueToShow=fieldValue>
            <#if field.control.params.options?? && field.control.params.options != "">
               <#list field.control.params.options?split(optionSeparator) as nameValue>
                  <#if nameValue?index_of(labelSeparator) == -1>
                     <#if nameValue == fieldValue?string || (fieldValue?is_number && fieldValue?c == nameValue)>
                        <#assign valueToShow=nameValue>
                        <#break>
                     </#if>
                  <#else>
                     <#assign choice=nameValue?split(labelSeparator)>
                     <#if choice[0] == fieldValue?string || (fieldValue?is_number && fieldValue?c == choice[0])>
                        <#assign valueToShow=msgValue(choice[1])>
                        <#break>
                     </#if>
                  </#if>
               </#list>
            </#if>
         </#if>
         <span class="viewmode-value">${valueToShow?html}</span>
      </div>
   <#else>
     <!– Editable mode. –>
     <!– let's keep a single label for both fields –>
      <label for="${fieldHtmlId}">${field.label?html}:<#if field.mandatory><span class="mandatory-indicator">${msg("form.required.fields.marker" )}</span></#if></label>
      <#if field.control.params.options?? && field.control.params.options != "">
       <!– first select for the parent value –>
         <select id="parent-${fieldHtmlId}" tabindex="0"
               <#if field.description??>title="${field.description}"</#if>
               <#if field.control.params.size??>size="${field.control.params.size}"</#if> 
               <#if field.control.params.styleClass??>class="${field.control.params.styleClass}"</#if>
               <#if field.control.params.style??>style="${field.control.params.style}"</#if>
               <#if field.disabled  && !(field.control.params.forceEditable?? && field.control.params.forceEditable == "true" )>disabled="true"</#if>>
         </select>
       
       <!– second select for the child value –>
         <select id="child-${fieldHtmlId}" name="${field.name}" tabindex="0"
               <#if field.description??>title="${field.description}"</#if>
               <#if field.control.params.size??>size="${field.control.params.size}"</#if> 
               <#if field.control.params.styleClass??>class="${field.control.params.styleClass}"</#if>
               <#if field.control.params.style??>style="${field.control.params.style}"</#if>
               <#if field.disabled  && !(field.control.params.forceEditable?? && field.control.params.forceEditable == "true" )>disabled="true"</#if>>
         </select>
       
       <!– hidden field containing the final value (e.g. the one sent to the server and stored in database) –>
       <input type="hidden" id="${fieldHtmlId}" name="${field.name}" />
       
         <@formLib.renderFieldHelp field=field />
      <#else>
         <div id="${fieldHtmlId}" class="missing-options">${msg("form.control.selectone.missing-options" )}</div>
      </#if>
   </#if>
</div>

<!– IMPORTANT: this script must execute after the fields are created –>
<script type="text/javascript">//<![CDATA[
   setTimeout(function(){populateSelects("${field.control.params.options}", "${fieldValue}", "parent-${fieldHtmlId}", "child-${fieldHtmlId}", "${fieldHtmlId}");}, 1000);
//]]></script>
‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

and /org/alfresco/components/form/controls/common/cascadingDropdownUtils.inc.ftl :


<!– defines how the option list elements are separated when passed to the client –>
<#if field.control.params.optionSeparator??>
   <#assign optionSeparator=field.control.params.optionSeparator>
<#else>
   <#assign optionSeparator=",">
</#if>

<!– defines how the label list elements are separated when passed to the client –>
<#if field.control.params.labelSeparator??>
   <#assign labelSeparator=field.control.params.labelSeparator>
<#else>
   <#assign labelSeparator="|">
</#if>

<script type="text/javascript">//<![CDATA[
<!– defines how the option list elements are separated when passed to the client –>
<#if field.control.params.optionSeparator??>
   <#assign optionSeparator=field.control.params.optionSeparator>
<#else>
   <#assign optionSeparator=",">
</#if>

<!– defines how the label list elements are separated when passed to the client –>
<#if field.control.params.labelSeparator??>
   <#assign labelSeparator=field.control.params.labelSeparator>
<#else>
   <#assign labelSeparator="|">
</#if>

<script type="text/javascript">//<![CDATA[
   /* string used to separate the parent from the child */
   var OPTION_SEPARATOR = "/";

   /**
   * Functions used to split and synchronize the data between the 2 lists.
   **/
   
   /**
   *   @param stringValues: string containing the available values for the given field
   *   @returns a javascript object containing those values
   **/
   function getValsArrayFromString(stringValues) {
      //array with the options
      var valsArray = stringValues.split("${optionSeparator}");
      //remove the labels
      for (var i = 0; i < valsArray.length; i++) {
         if(valsArray.indexOf("${labelSeparator}") != -1) {
            valsArray = valsArray.substr(0,valsArray.indexOf("${labelSeparator}"));
         }
      }
      return valsArray;
   }

   /**
   * Extracts the parent value from the full value of the option
   **/
   function getParentValue(fullValue) {
      return fullValue.substr(0,fullValue.indexOf(OPTION_SEPARATOR));
   }

   /**
   * Extracts the child value from the full value of the option
   **/
   function getChildValue(fullValue) {
      return fullValue.substr(fullValue.indexOf(OPTION_SEPARATOR) + 1);
   }

   /**
   * Parent value have been changed.
   * Reset the current total value, child value and updates the available child values
   **/
   function onChangeParentValue(valsArray, parentId, childId, totalId) {
      var parentValue = document.getElementById(parentId).value;
      var childSelect = document.getElementById(childId);
      
      /* empty the child select */
      while(childSelect.firstChild) {
         childSelect.removeChild(childSelect.firstChild);
      }
      
      /* fill the child select with the new values */
      for (var i = 0; i < valsArray.length; i++) {
         if ( getParentValue(valsArray) == parentValue) {
            var childValue = getChildValue(valsArray);
            var childOption = document.createElement("option");
            childOption.value = childValue;
            childOption.innerHTML = childValue;
            childSelect.appendChild(childOption);
         }
      }
   }

   /**
   * Child value have been changed.
   * Update the total value
   **/
   function onChangeChildValue(parentId, childId, totalId) {
      var parentValue = document.getElementById(parentId).value;
      var childValue = document.getElementById(childId).value;
      document.getElementById(totalId).value = parentValue + OPTION_SEPARATOR + childValue;
   }

   /**
   * Initial filling of the parent values available
   * TODO: handle default value
   **/
   function populateSelects(stringValues, initialValue, parentId, childId, totalId) {
      /* get an array from the string values */
      var valsArray = getValsArrayFromString(stringValues);
      var parentSelect = document.getElementById(parentId);
      /* we only want to display each parent value once. This object keeps track of the already added ones */
      var uniqueParentValues = {};
      
      /* populate parent select */
      for (var i = 0; i < valsArray.length; i++) {
         var realV = getParentValue(valsArray);
         if(!uniqueParentValues.hasOwnProperty(realV)) {
            uniqueParentValues[realV] = true;
            
            /* create new option for the parent select */
            var parOption = document.createElement("option");
            parOption.value = realV;
            parOption.innerHTML = realV;
            if(realV == getParentValue(initialValue)) {
               parOption.selected = "selected";
            }
            parentSelect.appendChild(parOption);
         }
      }
      parentSelect.onchange = function(){onChangeParentValue(valsArray, parentId, childId, totalId);};
      
      /* populate child select */
      onChangeParentValue(valsArray, parentId, childId, totalId);
      
      /* sets the correct child value */
      var childSelect = document.getElementById(childId);
      childSelect.value = getChildValue(initialValue);
      childSelect.onchange = function(){onChangeChildValue(parentId, childId, totalId);};
      onChangeChildValue(parentId, childId, totalId);
   }
//]]></script>
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IE advanced search now works as expected.

Re: Cascading Dropdown in alfresco share

alexsolomatin — Fri, 22 Feb 2013 13:46:24 GMT

Thanks, Scouil!

Your solution works well.

Re: Cascading Dropdown in alfresco share

umaistudio — Wed, 18 Jun 2014 09:05:22 GMT

Please guide me "how to create multiple dropdown for single property"

Re: Cascading Dropdown in alfresco share

scouil — Thu, 19 Jun 2014 04:11:38 GMT

I'm not sure what your requirement is there, but could you look below at the solution where I render cascading dropdown based on a single property?
It might just help you getting started with yours.