I hit an interesting issue recently, around provisioning the Content Search web part onto a page with the AllUsersWebPart element. I should say upfront that I’m not (currently) providing an awesome “here’s some code” solution to the problem, but will suggest approaches that should work fine. Mainly I want to raise awareness of the problem at this stage – if you hit it, you’re not going crazy.
So, before we get to my actual issue, we have an interesting decision point if we are working against a site with publishing in the "developer/Visual Studio” way. Do we:
- You are NOT going to need those HTML files in production – they are not used at runtime. The whole thing is purely to support the design phase!
Touching a file –> to trigger an event receiver –> to generate a file –> which you already have in the development environment == no sense to me :) However, I would say that if you *are* working in a publishing site (e.g. in SPD), always edit the HTML file if it exists – otherwise of course, your changes to the .js file will be overwritten whenever that event receiver executes.
I use XML like the following for this – I found that the key property, ‘HtmlDesignAssociated’ defaults to 0 (zero) but when deploying the .js file only, I like to set it to zero explicitly:
With that out of the way, let’s discuss the problem I see when extending the above - to have a Content Search web part automatically added to a page with AllUsersWebPart element.
Problem - custom Display Template not linked when provisioning Content Search web part using AllUsersWebPart
[Update April 30, 2013 – Ivan Neganov has found a solution to what follows, see the comments at the bottom of the article!]
Hopefully that title was descriptive enough. So the goal is to provision the Display Template in a Feature, but also make use of it – i.e. provision some kind of page which has a pre-configured Content Search web part on it, where the configuration ‘points to’ a custom Display Template. I think this scenario will be pretty common – you’d use it in many places, such as rolling up some news articles with a particular look and feel. The process I used is what any experienced SharePoint developer would probably expect:
- Configure the CSWP with the right settings on a page
- Export the web part to get the XML
- Drop into an AllUsersWebPart element in a Feature
- Check the settings all look good
The key bit of configuration we’re interested in is this line, but it all looks good at this stage:
<property name="ItemTemplateId" type="string">~sitecollection/_catalogs/masterpage/Display Templates/Content Web Parts/Item_Picture3Lines_COB_blue.js</property>
The overall web part XML is as follows (the “ItemTemplateId” is the last property to be listed):
The result is that seemingly all aspects of CSWP configuration take effect, except the custom Display TemplateSo. all other properties are applied, so the search query works fine and shows the correct items - but the look and feel is the out-of-the-box branding supplied by the ‘Item_Picture3Lines.js’ template (i.e. not my ‘Item_Picture3Lines_COB_blue.js’ file). What’s weird is that if you then edit the page, you find that your custom template is indeed available for selection (see first image in this article), and selecting it works just fine and the branding gets applied. At first I assumed this was some sort of issue with the format, or a ‘provisioning sequence’ issue, and played around with some ideas (breaking things into multiple Features with dependencies etc.) – none worked, so it was time to break out Reflector Pro.
After a pretty forensic ‘debugging SP2013 code’ investigation (I had a colleague trace my steps independently, thanks Hrayr!), this looks like a possible bug to me. We also tried environments before and after the March 2013 Public Update, but saw the same results. Essentially the provisioning process eventually calls into some code in the ContentBySearchWebPart class itself, and in particular a method called IsTemplateLocationValid. We see that one check appears to expect the path to start with “~sitecollection/_catalogs/masterpage” (this has been stripped off by earlier SharePoint code, despite the value being specified that way in the XML), so that one fails (click to see larger image – and sorry if you’re not into the Visual Studio ‘Dark’ theme!):
..and the next check expects SPContext to be present. However, it isn’t! I’m not sure why, given the Feature is being activated through the browser in the SharePoint ‘Activate Site Features’ page in my case, but there is definitely no SPContext. So between these two checks, I’d expect one to succeed. I can’t help but think that there is currently a minor bug in SharePoint 2013 - where SPContext is expected to be present in this provisioning process, but for whatever reason it isn’t. I say this partly because I notice that even for out-of-the-box templates, the value comes through stripped of the “~sitecollection” token:
I also tried using *just* the filename:
<property name="ItemTemplateId" type="string">Item_Picture3Lines_COB_blue.js</property>
..but then the page does not load (blank screen, HTML not output properly) and ULS shows the following runtime error:
Application error when access /SitePages/CSWP_Provisioned.aspx, Error=Cannot make a cache safe URL for "item_picture3lines_cob_provisioned.js", file not found. Please verify that the file exists under the layouts directory.
at Microsoft.SharePoint.Utilities.SPUtility.MakeBrowserCacheSafeLayoutsUrl(String name, Boolean localizable, Int32 desiredVersion)
Broadly I think these are the options:
- Manually fix-up any pages where you are adding the Content Search web part using AllUsersWebPart – i.e. edit the page by hand, select the Display Template in the web part properties, then save the page.
- On-premises only - run some server-side code (e.g. in a Feature receiver) to fix things up. Use SPLimitedWebPartManager to update the web part properties.
- For Office 365 – run some client-side code (JSOM or CSOM) to fix up the web part.
I don’t think any of the code would be hugely challenging to write – I might do it soon if no-one else does :) But for now, I just wanted to highlight the issue. Do you see a different behavior? Please leave a comment and let me know if so!