topic Re: Display asset content without <@streamasset in Alfresco Archive

Display asset content without <@streamasset

morphinof — Fri, 22 Apr 2011 10:39:25 GMT

Hi !In a web script ftl file, i list html files collection from a section and i would like to get the html content of these files.When i list asset properties i have following ones :cm:content = org.alfresco.wcm.client.impl.ContentInfo@822086cm:created = 21 avr. 2011cm:creator = admincm:description

Re: Display asset content without <@streamasset

bremmington — Tue, 26 Apr 2011 07:23:23 GMT

Why do you not want to use "streamasset"?

Re: Display asset content without <@streamasset

morphinof — Tue, 26 Apr 2011 08:28:25 GMT

Because i need to store this content into a js var that i want to give to a jQuery plugin.

Re: Display asset content without <@streamasset

bremmington — Tue, 26 Apr 2011 09:02:11 GMT

If I understand you correctly you have a Freemarker template rendering property names and values directly into JavaScript which is being sent back to the browser for execution. Presumably you need to escape each property name and value to ensure it's valid JavaScript which is why streamasset isn't appropriate.

I suggest that you write a Freemarker directive similar to AssetDirective (which is the one that is exposed with the name "streamasset") that escapes the content stream on the fly. I don't recommend that you read the content in as a String and then process it, since that will adversely affect the scalability of your webapp.

Re: Display asset content without <@streamasset

morphinof — Tue, 26 Apr 2011 09:14:41 GMT

Not exactly, maybe the post title is not really appropriate, in fact i was wondering how to access to html content of an html asset in a collection, and give it to js with ${}.

So far i found this in java <@streamasset implementation :

// Get the assets content stream
InputStream stream = asset.getContentAsInputStream().getStream();‍‍

I would like to access it directly (such as any asset propertie in my template ie : <#assign coords = location.properties["cm:description"]?split(",")>) and not through a directive, that's why i tried to found the right way to access it by displaying properties of an asset, is it possible ?

Here is my template :

<#if locations?? && locations.assets?size != 0>
    <script type="text/javascript">
    $("#gmap").gMap
    (
        {
            markers:
            [
                <#list locations.assets as location>
                    <#assign coords = location.properties["cm:description"]?split(",")>
                    {
                        latitude: ${coords[0]},
                        longitude: ${coords[1]},
                        html: "here i would like to put the html content of my asset"
                    },
                </#list>
            ],
            zoom: 10
        }
    );
    </script>
<#else>
    No locations !
</#if>‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Display asset content without <@streamasset

bremmington — Tue, 26 Apr 2011 13:13:07 GMT

There isn't any support in the WebQS API to read the content as a String. You would have to write that yourself by wrapping Asset.getContentAsInputStream with code that reads the stream into a String. I don't recommend that you do that unless you absolutely know that the content is small (and text-based).

For your specific example I would tend to do something like this:


<#if locations?? && locations.assets?size != 0>
    <script type="text/javascript">
    $("#gmap").gMap
    (
        {
            markers:
            [
                <#list locations.assets as location>
                    <#assign coords = location.properties["cm:description"]?split(",")>
                    {
                        latitude: ${coords[0]},
                        longitude: ${coords[1]},
                        html: <@streamasset asset=location />
                    },
                </#list>
            ],
            zoom: 10
        }
    );
    </script>
<#else>
    No locations !
</#if>
‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

If you have to escape the content of the location asset then I suggest that you write a variant of the streamasset directive that escapes the content stream directly.

Re: Display asset content without <@streamasset

morphinof — Tue, 26 Apr 2011 13:17:53 GMT

Sounds good

Is there any tutorial to create customs user-directives ?

Thanks a lot for your help !