topic Re: JavaScript: check for undefined variable in Alfresco Archive

JavaScript: check for undefined variable

mruflin — Mon, 02 Jul 2007 14:14:42 GMT

I'm unsuccessfully trying to find out whether a variable is defined or not. Is there a simple way to do this?Context:I'm inside a workflow.jbpm.AlfrescoJavaScript action (defined in a workflow) and am trying to check whether bpm_workflowDueDate is set or not.The following twobpm_workflowDueDate ===

Re: JavaScript: check for undefined variable

gavinc — Tue, 03 Jul 2007 08:58:05 GMT

Try using the following syntax:

if (bpm_workflowDueDate != void) taskInstance.dueDate = bpm_workflowDueDate;

This is used in the adhoc_processdefinition.xml file describing the ad hoc workflow.

Re: JavaScript: check for undefined variable

mruflin — Wed, 04 Jul 2007 16:07:27 GMT

This unfortunately does not work. The code inside <script> and inside the script action is executed differently. The first one passes, the second one throws a ReferenceError. I'm even not sure whether the first one is actually JavaScript.


  <task-node name="review">
    <task name="cwwf:reviewTask" swimlane="assignee">
      <event type="task-create">
        <script>        
          if (bpm_workflowDueDate != void) taskInstance.dueDate = bpm_workflowDueDate;
          if (bpm_workflowPriority != void) taskInstance.priority = bpm_workflowPriority;
      </script>
         <action class="org.alfresco.repo.workflow.jbpm.AlfrescoJavaScript">
         <script>
           if (bpm_workflowDueDate != void) {
              taskInstance.dueDate = bpm_workflowDueDate;
           }
          </script>
        </action>
      </event>
    </task>
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My guess is that RhinoScriptService handles undefined variables in a wrong way, because (x == undefined) is valid JavaScript yet does it throw an exception here.

Re: JavaScript: check for undefined variable

gavinc — Thu, 05 Jul 2007 08:16:11 GMT

Apologies, I obviously didn't read your post well enough.

The script within the first <script> block is actually beanShell syntax which is what I mistakenly thought you were referring to.

The second <script> block as you say is indeed RhinoScript and so x == undefined should work, we can't think of any reason why not.

We'll take a look and see if there is any reason for this.

Re: JavaScript: check for undefined variable

vladimir_kovaly — Fri, 09 Nov 2007 11:15:41 GMT

That works fine:


            <action class="org.alfresco.repo.workflow.jbpm.AlfrescoJavaScript">
               <script>
                  <![CDATA[
                  if (typeof bpm_workflowDueDate != 'undefined')
                     taskInstance.dueDate = bpm_workflowDueDate;
                  if (typeof bpm_workflowPriority != 'undefined')
                     taskInstance.priority = bpm_workflowPriority;
                  ]]>
               </script>
            </action>‍‍‍‍‍‍‍‍‍‍‍

Re: JavaScript: check for undefined variable

mathias_lin — Tue, 21 Jul 2015 04:54:00 GMT

x == undefined‍

does not work in all cases.

In a web script controller for example:

While this


if (args.to != undefined) …
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works, the following


if (requestbody != undefined) …
if (formdata != undefined) …
‍‍‍‍

will both throw an error:


ReferenceError: "requestbody"/"formdata" is not defined.
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