Insert variable value from JS using code injection

Question

in JS I have this code:

var trade ="some text";
var id = 12;
var script = "<img src='"+<%=GetImageURL(id, "~/images/default.jpg") %>+"' 

              alt='"+trade+"' width='180' />";

I want to call the method GetImageURL with my variable id, but I can't, because this variable is from JS. How call GetImageURL with value of id from JS?

When GetImageURL is executed, the JS is still being emitted by the server (presumably), so it hasn't been parsed by browser and thus doesn't really exist yet. — LB2
– LB2, Commented Mar 21, 2014 at 14:09

i100 · Accepted Answer · 2014-03-21 14:09:22Z

2

GetImageURL is server side method. To call it from javascript (which is client side) you should use ajax.

answered Mar 21, 2014 at 14:09

i100

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Comments

longchiwen · Accepted Answer · 2014-03-21 15:00:43Z

1

You can't use js variable in server side method. You could use fake ID paramter in GetImageURL and then replace it with js variable in javascript. Something like:

var trade ="some text";
var id = 12;
var url = '<%=GetImageURL("[FAKEID]", "~/images/default.jpg") %>'.replace("[FAKEID]",id);
var script = "<img src='"+url +"' alt='"+trade+"' width='180' />";

If you want to use GUID then you can set Guid.Empty as fake parameter

 var trade ="some text";
 var id = 12;
 var url = '<%=GetImageURL(Guid.Empty, "~/images/default.jpg") %>'.replace("<%=Guid.Empty.ToString()%>",id);
 var script = "<img src='"+url +"' alt='"+trade+"' width='180' />";

edited Mar 21, 2014 at 15:00

answered Mar 21, 2014 at 14:28

longchiwen

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2 Comments

Alex Over a year ago

"[FAKEID]" is string, but I need to be Guid, have any suggestions how to proceed? please

Alex Over a year ago

I tried to use your code, but when is call the method GetImageURL is sent guid null is not sent id from replace, and the methot not work right, replace is done after calling the method, anyway thanks for your time

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