Printing <img> to ColdFusion web app client from server side JSON

Posted on 2012-12-26
Last Modified: 2012-12-28
I'm working with ColdFusion 9 and JQuery datatables.

I'm using the JQuery databasles server side data capability to page through large datasets.  I want to display images in one the fields of the dataset.  My images reside outside the webroot for security reasons.  

How can I pull the image from the location on the server drive to display in the table.  I know I could use cfimage except for the data be returned to the client is JSON.

Is there a way to temporarily load the image in the browser memory so that the img tag can access it?
Question by:HyperBPP
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LVL 75

Accepted Solution

käµfm³d   👽 earned 250 total points
ID: 38721616
How large are the images? Perhaps a data URI could suffice?

Author Comment

ID: 38721918
They're small.  ~7kb.  Need to display as ~20x15px or so.  Looks like I encode them as base 64?
LVL 75

Expert Comment

by:käµfm³d 👽
ID: 38721935
Looks like I encode them as base 64?
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Author Comment

ID: 38722185
Ok, I'm doing the below, and it works except for the color of the icon gets changed.  Almost like a color negative.  Any thoughts?

<cfset thisFile = '#myIcons#unitIcon/#qFiltered.ICON#'>
	<cfset qFiltered.ICON = '<img
src="data:image/*;base64,#toBase64( photo )#"

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LVL 52

Expert Comment

ID: 38722368
What kind of image - jpg, png, ..?

As a test, do a <cfimage action="writeToBrowser" ...> of #photo# on a separate page. Are the image colors still wrong? Edit  If yes, it suggests a problem with the image itself. Try the same test with a few other images.  If no, it's a problem with the base64 function.

Author Comment

ID: 38723846

They are .png.

Tried the <cfimage action="writeToBrowser" ...> which worked fine.  If it's a problem with the base64 function what can I do?  Do I use a different function, or are my parameters wrong?


Author Comment

ID: 38723936
And another tidbit of info.  Just found that the images work in FireFox (with the coloring wrong) but do not display in Internet Explorer at all.
LVL 52

Assisted Solution

_agx_ earned 250 total points
ID: 38724064
Sorry I should've said "suggests a problem with the base64 function" not that it definitely *is* that function.  Something could be going wrong with the transfer through jquery.  You need to rule that out.  Add the same "<img> tag directly to your test page. Does it display correctly?

ie   <cfoutput>
          <img src="data:image/*;base64,#toBase64( photo )#" height="20"/>

You could also try reading the image binary and converting that to base64 - instead of using cfimage.

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