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Showing Resized Images on a Community Server/Telligent Blog

  • Artykuł

Back in Community Server 2.1 (i.e. prior to the recent upgrade of the MSDN/TechNet blog platform), I could specify a URL like the following to show a smaller version of an image in a blog post:

https://blogs.msdn.com/photos/jjameson/images/9997719/500x258.aspx

I also provided a link to allow users to see the full-size image, for example:

https://blogs.msdn.com/photos/jjameson/images/9997719/original.aspx

Here's some typical HTML markup for showing images in my blog posts:

     <div class="image">
        <img src="https://msdntnarchive.z22.web.core.windows.net/media/MSDNBlogsFS/prod.evol.blogs.msdn.com/CommunityServer.Components.PostAttachments/00/09/99/77/19/Hyper-V%20Staggered%20Start.png" original-url="https://blogs.msdn.com/photos/jjameson/images/9997719/500x258.aspx"
            alt="Hyper-V Manager showing the staggered start of various VMs"
            width="500" height="258" />
        <div class="caption">
            Figure 1: Hyper-V staggered start</div>
        <div class="imageLink">
            <a href="https://msdntnarchive.z22.web.core.windows.net/media/MSDNBlogsFS/prod.evol.blogs.msdn.com/CommunityServer.Components.PostAttachments/00/09/99/77/19/Hyper-V%20Staggered%20Start.png" original-url="https://blogs.msdn.com/photos/jjameson/images/9997719/original.aspx"
            target="_blank">
                See full-sized image.</a>
        </div>
    </div>

After the upgrade of the MSDN/TechNet blog platform to Telligent Community 5.5, we can no longer store images in "/photos" (i.e. media libraries have been disabled in our Telligent installation). Instead, we are now expected to upload images through the file storage feature on our blogs (i.e. via our blog dashboard pages, by clicking Manage --> Files).

Note that before the upgrade, it was very easy to grab the URLs of resized images stored in Community Server photo galleries (now called media libraries, I believe). However, when uploading images through blog file storage, you aren't provided with any out-of-the-box functionality to view the images in various sizes.

Fortunately, with a little extra work, you can use one of the out-of-the-box HTTP handlers (resized-image.ashx) to dynamically resize images uploaded via blog file storage in Telligent Community 5.5.

For example, the new URL corresponding to the first URL shown above is:

https://blogs.msdn.com/resized-image.ashx/__size/500x258/__key/CommunityServer-Components-PostAttachments/00-09-99-77-19/Hyper_2D00_V-Staggered-Start.png

Essentially it's a matter of replacing "cfs-filesystemfile.ashx" in the URL with "resized-image.ashx" and adding the desired size for the image.

Note that you don't have to specify both height and width for the new image size. For example, "/__size/500x0" produces similar results in the above example (in other words, the height is automatically calculated in order to preserve the aspect ratio of the image).

Important

There appears to be a bug in Telligent Evolution 5.5 when the filename for the image contains certain characters (e.g. parentheses). For example, if you upload an image named "Upgraded TFS project site in SharePoint Server 2010 (with Reporting Services error).png"and then attempt to dynamically resize it using the resized-image.ashx handler, you will find it simply doesn't work. Fortunately if you rename the image to remove the parentheses (and subsequently upload the renamed file), then the image resizer works as expected.