Dynamic query string in html css link

Question

Can anyone tell me why this works:

<script type="text/javascript" src="/js/jqFuncs.js?v=<%=jqFuncsScriptlastWriteTime %>" />

But this doesn't

<link type="text/css" rel="stylesheet" href="/css/site.css?v=<%=sitecsslastWriteTime %>" />

My code behind has:

public string jqFuncsScriptlastWriteTime = System.IO.File.GetLastWriteTime(@"c:/web/cs3/js/jqFuncs.js").ToString("yyMMdd");
public string sitecsslastWriteTime = System.IO.File.GetLastWriteTime(@"c:/web/cs3/css/site.css").ToString("yyMMdd");

The rendered HTML looks like this:

<script type="text/javascript" src="/js/jqFuncs.js?v=131126" ></script>
<link type="text/css" rel="stylesheet" href="/css/site.css?v=&lt;%=sitecsslastWriteTime %>" />

could you try adding rel="stylesheet" on your link tag? not sure if it is required in all browsers. According to this, it is required: w3schools.com/tags/tag_link.asp — David Fleeman
– David Fleeman, Commented Dec 10, 2013 at 14:41
the rel doesn't make a difference to the server rending the variable — Gordon Copestake
– Gordon Copestake, Commented Dec 10, 2013 at 14:43
So this is a server side problem -- the variable is not written into the page? You should update your question instead of saying "it doesn't work". If it is not writing the expected variable value into the page on the server side, I would guess the file c:/web/cs3/css/site.css doesn't exist or you don't have access to it. — David Fleeman
– David Fleeman, Commented Dec 10, 2013 at 14:44
Great, now we can fix this for you! Please refer to this for fix: stackoverflow.com/questions/5603086/… — David Fleeman
– David Fleeman, Commented Dec 10, 2013 at 14:52

Community · Accepted Answer · 2017-05-23 11:57:34Z

2

The problem is caused by the way ASP.NET treats LINK tags. Here is another question/answer that provides the solution:

Problem in Expression tag to bind string variable

I would try adding runat="server" first on the link tag. If that does not work, then I would use the other solution that is the accepted answer.

edited May 23, 2017 at 11:57

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answered Dec 10, 2013 at 14:52

David Fleeman

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2 Comments

Gordon Copestake Over a year ago

Thanks Dave, this pointed me to a slightly different answer, but one that worked!

David Fleeman Over a year ago

NP - I found the link valuable because it had the REASON why your original code did not work as well as a solution! Happy coding!

Community · Accepted Answer · 2017-05-23 11:57:34Z

2

Hie Gordon,

There are some differences between href and src. More details here:

Difference between SRC and HREF

Thanks!

edited May 23, 2017 at 11:57

CommunityBot

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answered Dec 10, 2013 at 14:38

Eliezer Bernart

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1 Comment

Gordon Copestake Over a year ago

hmmmmm i see. Is there a way I can add a dynamic query string to a href then?

Gordon Copestake · Accepted Answer · 2013-12-10 14:57:15Z

2

For anyone else searching for the answer i used this:

<%= String.Format("<link type=\"text/css\" rel=\"stylesheet\" href=\"/css/site.css?v={0}\" />", sitecsslastWriteTime) %>

answered Dec 10, 2013 at 14:57

Gordon Copestake

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