How to add a Javascript event in codebehind

Hi all,

I know this is a trivial question, but I can't seem to figure it out. Pardon my inarticulation in asking the question...

I'm using ASP.NET such that in the OnLoad event of the codebehind, some javascript is dynamically assigned to a button's "onclick" event. Works as expected if the user clicks on the button. However, I also want this javascript to fire when other events occur on the page (i.e. certain values are entered into select textboxes). How, in the codebehind, can I simulate the user clicking this button so that the onclick javascript fires?

Thanks.

Robert

May 28 '08 #1

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1665

DrBunchman

979

Expert 512MB

Hi Robert,

You can assign javascript to other controls in the same way as you did with your button. Check out this for a list of the possible events that you can use.

If you want to use the same javascript code for different events then you should store it as a function. A Javascript function defined between the <head /> tags can be called from any part of your page. Simply define the function and call it like so:

On your .aspx page:

Expand|Select|Wrap|Line Numbers

 
<head> 

<script type="text/javascript">

function TestFunction()

{

alert('Hello World!!')

}

</script>

</head>

On your code behind page:

Expand|Select|Wrap|Line Numbers

textbox1.attributes.add("onchange", "TestFunction();")

Does this help?

Dr B

PS Robert, you've posted your question in the ASP Forum which is for Classic ASP only - I've moved it for you but please post all your future ASP.NET questions in the .NET forum. Thanks.

May 29 '08 #2

deric

Could the following help?

In your code behind:

Expand|Select|Wrap|Line Numbers

 
Public myEvent As String

myEvent = ""

...

myEvent = "myFunction();"

In your .aspx page:

Expand|Select|Wrap|Line Numbers

 
<html>

<script language="javascript">

function myFunction(){

...

}

</script>

...

<input type="button" name="myButton" onclick="<% =myEvent %>" />

<input type="input" name="myText" onchange="<% =myEvent %>" />

...

</html>

May 29 '08 #3

kunal pawar

297

100+

DrBunchman is gives right code and solution hope this will helps you

May 30 '08 #4

RobertTheProgrammer

First of all, thanks for moving the thread to the .NET forum instead. I'm still learning...

Second, thanks for the response. I kind of figured that calling the javascript was the way to do it, but I just couldn't get my head wrapped around it.

Thanks again.

Robert

May 30 '08 #5

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How to add a Javascript event in codebehind

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