Where are the Digital Asset Management Standards?

A brief post on the CMIS4DAM technical committee is up on the Alfresco blog.

Categories: Uncategorized

Adding Document Library Views to Alfresco Share

20120808 8 comments


In this post we’ll go through how to develop and deploy additional view types beyond the default simple and detailed views in the document library in Share.

The techniques here require Alfresco 4.0.2 or later, or a recent checkout of community HEAD.

The Document Library Component

We won’t go into all the details on how the document library is rendered but it’s a fairly standard webscript-based component with ‘server-side’ resources like FreeMarker files for HTML fragments, Javascript for manipulating the data model, and localization properties files, and ‘client-side’ resources sent to the browser like CSS and Javascript.

While adding a document library view will involve changes to both client-side and server-side tiers, most of our notable changes will be to client-side Javascript files sent to the browser. The server-side webscripts changes are primarily to load and instantiate the client-side objects.

The component we’re interested in is at:

and note that within that directory resources from include/documentlist.* are included by some of the primary files.

DocumentList and DocumentListViewRenderer

The DocumentList Javascript object makes up the bulk of the document library view and is defined in the client-side documentlist.js file along with event handler methods and other display setup. The DocumentList object sets up a YUI DataTable which handles most of the work of AJAX calls, pagination, etc.

Each column in the DataTable is assigned a method which dictates how to render that column given the data row.  For example, the DataTable calls DocumentList.fnRenderCellThumbnail for the ‘thumbnail’ column of each row it renders.

The DocumentList also contains a set of registered DocumentListViewRenderers, ‘simple‘ and ‘detailed‘ by default, which do the work of generating the HTML for their view type. In other words, DocumentList.fnRenderCellThumbnail actually determines the current view renderer based on the current viewRendererName and hands off its work to DocumentListViewRenderer.renderCellThumbnail.

This allows developers to create their own objects which extend and override the DocumentListViewRenderer with methods for their specific needs.

For this example our goal will be to add a view which is very similar to the existing detail view but with larger thumbnails.

Steps to Add a View

Define the View

For a new view we need to define a new DocumentListViewRenderer object.  That customization could be just a new instance of the base DocumentListViewRenderer with a different name so that alternate CSS is applied and metadata rendered.

The name of the view renderer specified in the constructor is used for CSS class names among other things so a simple example of adding a second detailed view with a larger thumbnail might look like:

new Alfresco.DocumentListViewRenderer("large");

In more complex scenarios you probably want to extend DocumentListViewRenderer in a client-side documentlist-custom.js file, which is what we’ll do in this example.

First we want to define a constructor:

Alfresco.DocumentListLargeViewRenderer = function(name)
   Alfresco.DocumentListLargeViewRenderer.superclass.constructor.call(this, name);
   // Defaults to large but we'll copy the metadata from detailed view
   this.metadataBannerViewName = "detailed";
   this.metadataLineViewName = "detailed";
   this.thumbnailColumnWidth = 200;
   return this;

then make it extend from DocumentListViewRenderer:

YAHOO.extend(Alfresco.DocumentListLargeViewRenderer, Alfresco.DocumentListViewRenderer);

and we’ll override the renderCellThumbnail method with almost the same code in the detail view, but adding a documents-large CSS class to the thumbnail container and changing the call to generateThumbnailUrl to use the imgpreview thumbnail definition:

Alfresco.DocumentList.generateThumbnailUrl(record, 'imgpreview')

(Full code)

Register the View

Once the view renderer has been defined it needs to be registered with the DocumentList object via its registerViewRenderer method.  This needs to be done after the DocumentList object has been created and setup, so a good place to perform the registration is after the YUI Bubbling Event postSetupViewRenderers has fired.  To register the same view above:

YAHOO.Bubbling.subscribe("postSetupViewRenderers", function(layer, args) {
   var scope = args[1].scope;
   var largeViewRenderer = new Alfresco.DocumentListLargeViewRenderer("large");
Accessing the View

The user has to be able to navigate to this new view and even though we’ve registered it, the DocumentList needs to know which view renderers are enabled and in what order, both of which are defined in the DocumentList’s options under viewRendererNames.  We can add our custom view above to the server-side FreeMarker model:


Note that the name here must match the name of the view renderer constructor.

Not only does this define that the ‘large‘ view is enabled, the navigation buttons are also rendered from this viewRendererNames list, so we’ve taken care of the interface as well.


Our overridden renderCellThumbnail method above adds the documents-large CSS class so we’ll need to define that, as well as the display of the view selection button. Here’s a portion of the documentlist-custom.css file:

.doclist .thumbnail.documents-large {
	height: 200px !important;
	width: 200px !important;
.doclist .thumbnail.documents-large img {
    max-width: 280px;


There are of course a number of ways this code could be packaged and deployed but this type of customization lends itself particularly well to a share extensibility module which Erik Winlöf and David Draper have blogged about in detail.  We’ll assume a standard Maven or Gradle Java project layout for the code, and to keep things simple the example deploys as a Share jar rather than an AMP.

Server-side Resources

We need to define the customization itself:



            <id>Example :: Document List Custom View</id>


We could place the javascript which creates the new view renderer a number of places, even purely client-side, but as we’ll see in another post it can be handy to have access to the FreeMarker data model so we’ll place it in:


Note that the the wrapping <@markup> directive there indicates that we want to inject the Javascript after documentListContainer.

We’ll place the server-side webscript javascript which enables the view at:


which will get its label from the localization file at:

Client-side Resources

For including client-side CSS, Javascript, and image resources in a jar we’ll place them in the META-INF dir at:

So at this point src/main/resources should look like:

Package that as jar or AMP and deploy to your Share instance.


The next time you go to a site’s document library you should see the additional
button for your view and the larger thumbnails:

Since we implemented this as a standard extensibility module you can completely disable it by going to your Share deployment’s module management page at something like http://localhost:8080/share/page/modules/deploy and disable the module.

What’s Next?

I’ll go into more advanced customizations in future posts, but in the meantime, what kind of doclib view are you going to build?

My Mullet Business Card

20110902 3 comments

I recently had to redesign my business card and decided to take a step back and think about the different functions it serves at different times. What resulted was my new mullet cards: business in the front, party in the back.

A business card can be much more than just a means to contact you at a later time.

It’s a way to connect with people on a personal level

At networking events I notice that people often jump to the address when handed a business card in order to strike up a conversation about people or places they know near there.  There’s a good chance we have a lot more in common than that so I threw several work and personal interests in a sort of thin word cloud.  Maybe they’re an avid cyclist, maybe they’ve just started coworking, or maybe they want to blow off this networking event and go get a good beer.

Who the hell was this and why do I have their card?

If I don’t process (I use CardMunch) the cards I’ve collected at an event with 24 hrs (which I usually do) I often can’t place a person by their name or company alone if I didn’t have more than a brief conversation with them.  My interests might help someone recall who handed them the card, but a face will almost certainly do the trick.  Realtors usually have a headshot on their cards, why shouldn’t I?

Use QR codes wisely

QR codes are meant to ease entry and access for mobile devices.  Often people put all of their contact info in one QR code in something like a vCard format, which can work, but when you try to put all of your information in a single code it can greatly affect the ability of QR readers recognize it, especially in bad lighting.  Even if the vCard does get captured it most often gets neatly tucked away in their address book, never to be viewed again.

I chose instead to go with two simple codes; one that is the URL for my About Me page, and one that is my Google Voice number.  If I’m telling someone how cool Untappd is or discussing cycling routes they can quickly snap the About Me QR code I just handed them and get right to my Untappd or RunKeeper profiles from there.  If weeks later they find my card and decide they want to chat they can snap the Call Me code which is only the phone number so most readers will just ask for a quick confirmation then dial directly, no hunting through address books.

Don’t buck the trend too much

The front is pretty much your traditional card with basic contact info.  Obviously not everyone knows what a QR code is, let alone how to read them, or is going to want to look at my ugly mug. Business in the front.

A shout out to the printers

I used MOO.  I was very impressed with the ease of submitting and verifying, speed of printing and shipping, and quality of the final product.  They did a fantastic job and I highly recommend them.

This was a good first pass, I’ll probably modify them a bit for the next round.  Do you have any suggestions?

Categories: Uncategorized

Inconsistent CMIS Query Results? It’s not You, It’s your Locale.

A simple CMIS query like:

SELECT D.* FROM cmis:document AS D WHERE D.cmis:name LIKE '%Flower%' OR D.cmis:contentStreamFileName LIKE '%Flower%'

was giving me a fit lately, not working at all in RightsPro‘s CMIS plugin which uses OpenCMIS and yielding inconsistent results in CMIS Workbench where re-posting the same query ten times would give the expected result maybe half the time.

Thanks to Florian Müller and this post, it seems as though Alfresco doesn’t always behave as expected when the locale is set in the CMIS session.

Removing the locale session parameters got things working in RightsPro, but I didn’t immediately see an easy way to change the locale in a Workbench session (the log shows that it’s using a default of en_US), and I still don’t know what’s up with the inconsistent results there, perhaps a coincidental caching issue.

This was all using OpenCMIS 0.3 against Alfresco Enterprise 3.3.1 over SSL.

Searching Custom Aspects via CMIS

20110212 2 comments

I didn’t immediately see any simple, working examples of how to search custom aspect properties via CMIS so I’ll post a brief one here.

The Aspect

In this example we’re using a CMIS query to search for the IPTC caption property provided by the IPTC/EXIF project. After installing that module the properties are applied using an aspect which is defined in $ALFRESCO_HOME/WEB-INF/classes/alfresco/module/iptcexif/model/iptcModel.xml.

Within that file you’ll see:

      <aspect name="iptc:iptc">

The Query

In our case the target Alfresco repository is running enterprise 3.3.1 and aspects are implemented via JOIN syntax as very briefly stated in the wiki.

So the resulting query for this particular search of the IPTC caption field ends up looking like:

SELECT D.*, IPTC.* FROM cmis:document AS D JOIN iptc:iptc AS IPTC ON D.cmis:objectId = IPTC.cmis:objectId WHERE IPTC.iptc:caption LIKE '%searchTerm%'

The Changes

There were big changes in Alfresco 3.4 in terms of metadata extraction and I haven’t yet had a chance to update the forge projects (or determine if they’re still even needed) and there are proposals for aspects in the next CMIS spec so I’ll be back to update this post.

Categories: Alfresco, CMIS Tags: , , ,

MyFaces Tomahawk and the HTML BASE Tag

This one incited a bit of facepalm.

When trying to changing part of RightsPro‘s header implementation to use the HTML BASE tag the element seemed to be ignored completely and resource references were still relative to the page URL.  The tag was present, correct, and closed, but having no affect.

It turns out the BASE tag must appear ‘before any element that refers to an external source’ but MyFaces Tomahawk adds any script references needed immediately after the opening HEAD tag, rendering the BASE tag useless.

I don’t have time to modify the Tomahawk source at the moment for a proper fix but did submit a bug.

As a workaround you can put the BASE tag above the head element. It’s not valid HTML but most browsers will still obey it and render the page properly.

A short post, but it may save a few precious hairs from being pulled out. I’ll update if and when the bug is resolved.

Categories: Uncategorized

Spring @Configurable With AJDT Compile-Time Weaving

I know, that’s a honey of a title, but you found this didn’t you?

Anyways, after some house cleaning and re-organizing of the projects that make up RightsPro in Eclipse I found that domain objects annotated with Spring’s @Configurable annotation were no longer having their dependencies injected when running the app in tomcat or when running AbstractTransactionalDataSourceSpringContextTests unit tests.

Turns out I must have removed the AspectJ library during re-organization and added it back in which also seemed to wipe out the AspectJ Build settings in the project properties.  When AspectJ does its compile-time weaving it doesn’t know anything about the @Configurable annotation unless you add spring-aspects.jar to the Aspect Path tab in the AspectJ Build settings.

F yeah, magical aspects are back in business.

Categories: Java, Spring Tags: , , ,