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Asked: 2026-05-10T19:05:20+00:00

I have a problem with how ASP.Net generates the img tag. I have a

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I have a problem with how ASP.Net generates the img tag. I have a server control like this: 

<asp:Image runat='server' ID='someWarning' ImageUrl='~/images/warning.gif' AlternateText='Warning' />

I expect it to generate this: 

<img id='ctl00_ContentPlaceHolder1_ctl00_someWarning' src='../images/warning.gif' />

but instead it generates this:

<img alt='' src='/Image.ashx;img=%2fimages%2fwarning.gif'</img>

This give me errors when I execute the following js:

document.getElementById('ctl00_ContentPlaceHolder1_someWarning')

Any idea why it won’t generate the expected html?

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1 Answer

  1. Looks like it’s trying to use a custom handler (ashx) to deliver the image. Do you have any additional modules that may be overriding the default behaviour of the asp:Image?

    Your JavaScript won’t work because the image tag has not been given an ID in the HTML that was generated.

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