c# - How to get modified Image (img) Source (src) server-side? -

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i stuck on giving me headache. new asp.net , can't through seems simple in php.

i have img element declare empty src attribute :

<img runat="server" id="result_img" />

on client-side, have script changes values of attribute :

var img = $("img[id$='result_img']")[0]; img.src = 'pathtoimg';

the image showing , perfect.

however, when try modified value on server-side this

var urlimage = result_img.src;

the 'src' attribute still empty.

am doing wrong or impossible in asp ?

thanks help

i attach event handler click event on save button, or form submission event, , write image hidden field there. or use ajax post server.


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