How to set html img src from code behind

Question

3.00/5 (1 vote)

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I have a html image in my asp.net page. Intially it is set to self.png.

Image will be set dynamically from server side means from code behind. How is it possible.

<img alt="" src="self.png" runat="server" class ="igte_rPayNet_ButtonImg" />

Any one please provide useful info.

Thanks

What I have tried:

on page_load event how can i change the image.
i was tried by using java script it's not working.

var img1 = document.getElementByClassNames("igte_rPayNet_ButtonImg");
var imag1= document.getElementsByTagName("igte_rPayNet_ButtonImg");

alert(img1);
alert(imag1);

trying the below i am getting objectHtmlcollections errors

var ig = document.getElementById("igte_rPayNet_ButtonImg").src = "../Images/joy.png";
alert(ig);

using JS am unable to getting it, and unable changing the image.

Posted 10-Feb-16 23:56pm

Kapuraveni BharathKumar

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3 solutions

Solution 1

Give the img tag an ID and then you should be able to reach it from the server-side:

HTML

<img alt="" src="self.png"  runat="server" class="igte_rPayNet_ButtonImg" id="yourIdHere" />

C#

yourIdHere.Src = "path-here.png"

Posted 11-Feb-16 0:05am

Thomas Daniels

Updated 11-Feb-16 0:08am

v2

Comments

Kapuraveni BharathKumar 11-Feb-16 6:56am

Thanks for the reply,
with out using img tag id, i want to do this.
using img tag class name if it is possible? to change the image by dynamically or using javascript.

Thomas Daniels 11-Feb-16 7:15am

I'm not sure why you want to do this, but anyway, it is possible. You can either search for the control, or use the PreRender event: http://stackoverflow.com/questions/2766408/how-to-select-an-element-by-class-instead-of-id-in-asp-net

Solution 2

The method is called getElementsByClassName, and it returns an array;

var img1 = document.getElementsByClassName("igte_rPayNet_ButtonImg");

if (img1.length > 0)
{
    img1[0].src = "joy.png";
}

Posted 11-Feb-16 0:11am

F-ES Sitecore

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Kapuraveni BharathKumar · Accepted Answer · 2016-02-11T01:20:00

Here is the Answer. thank you all for your support.

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script language="javascript" type="text/javascript">
$(function () {
$('.igte_rPayNet_ButtonImg').attr("src", '../Images/joy.png');
});
</script>