button.attributes.add not working properly

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Hi,

I'm running through a problem of client side scripting in ASP.Net. I've following code added for a button to show up and image on client side and go up server side:

btnSearch.Attributes.Add("onclick", "document.getElementById('preloaderImage').style.visibility='visible';");

This is working fine but only when I click the button first time, not on second and further clicks. I appreciate any help !!

Best regards,
Sunny.

Posted 18-Sep-12 23:18pm

Sunny_Kumar_

Updated 18-Sep-12 23:40pm

Kenneth Haugland

v2

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deepakaitr12345 19-Sep-12 5:34am

where did you write the above statements.
if the control goes to the server side after showing this then.definatly next time it will not call.must write the code on proper place.

Thanks

Sunny_Kumar_ 19-Sep-12 5:43am

I've written this code on Page_Load()

deepakaitr12345 19-Sep-12 5:47am

correct but under the Page.IsPostBack or outside.???

Thanks

Sunny_Kumar_ 19-Sep-12 5:57am

I've tried both, putting inside IsPostBack & outside of it.

Thanks

Mohd Imran Saifi 19-Sep-12 6:10am

what are you trying to do; image show/hide or what?

Sunny_Kumar_ 19-Sep-12 6:16am

exactly! I want to show an image as soon the button gets a click and hide the image as soon the server side code is processed.

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nikunjmochi · Answer 1 · 2012-09-19T00:50:00

Solution 1

Can't you add javascript on ASPX page for button.

That way you will not need to think worry adding attribute on code-behind.

Also you can write J-Query on document.ready which will be executed once page is loaded fully so you can hide the image,

Posted 19-Sep-12 0:50am

nikunjmochi

Updated 19-Sep-12 0:52am

v3

Comments

Sunny_Kumar_ 19-Sep-12 7:04am

thanks nikunjmochi,

I did it myself just a minute back... I just added this code inside <body> tag:

<script type="text/javascript" language="javascript">
Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(BeginRequestHandler);
Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);
function BeginRequestHandler(sender, args) {
var elem = args.get_postBackElement();
ManagePreloader('visible');
}
function EndRequestHandler(sender, args) {
ManagePreloader('hidden');
}
function ManagePreloader(state) {
document.getElementById('preloaderImage').style.visibility = state;
}

</script>

Just wanted to share how I handled this :)

Sunny_Kumar_ 19-Sep-12 7:04am

now it works like a charm !!

nikunjmochi 19-Sep-12 7:47am

great!!