Dynamic onclick event

getsanjay.sharma

Is there any way I can attach a function dynamically which takes some
parameters ?

<html>
<head>
<script>
doSomething = function(x)
{
alert(x);
}

reattach = function()
{
// doesn't work
document.getEle mentById("btnOn e").onclick = doSomething(200 );

// neither does this
document.getEle mentById("btnTw o").addEventLis tener("onclick" ,
doSomething(200 ), true);
}
</script>
</head>
<body>
<form>
<input type="button" name="btnOne" id="btnOne"
onclick="doSome thing(2)" value="One" />
<br />
<br />
<input type="button" name="btnTwo" id="btnTwo" onclick="reatta ch()"
value="Dynamic" />
</form>
</body>
</html>

By using the first syntax I just end up executing the function.

By using the addEventListene r function I get some weird error like:
"uncaught exception: [Exception... "Could not convert JavaScript
argument" nsresult: "0x80570009 (NS_ERROR_XPC_B AD_CONVERT_JS)"
location: "JS frame ::"

Any help is greatly appreciated.

May 13 '07 #1

Subscribe Reply

14824

ASM

ge************* *@gmail.com a écrit :

Is there any way I can attach a function dynamically which takes some
parameters ?

<html>
<head>
<script>
doSomething = function(x)
{
alert(x);
}

reattach = function()
{
// doesn't work
document.getEle mentById("btnOn e").onclick = doSomething(200 );

Perhaps :
document.getEle mentById("btnOn e").onclick = 'doSomething(20 0)';

Certainly :
document.getEle mentById("btnOn e").onclick = function() {
doSomething(200 );
}

or :
document.getEle mentById("btnOn e").onclick=Fun ction('doSometh ing(200)');
May be :
document.getEle mentById("btnTw o").addEventLis tener("onclick" ,
"doSomething(20 0)",
true);
}
--
Stephane Moriaux et son (moins) vieux Mac déjà dépassé
Stephane Moriaux and his (less) old Mac already out of date

May 13 '07 #2

getsanjay.sharma

Perhaps :

document.getEle mentById("btnOn e").onclick = 'doSomething(20 0)';

Certainly :
document.getEle mentById("btnOn e").onclick = function() {
doSomething(200 );
}

or :
document.getEle mentById("btnOn e").onclick=Fun ction('doSometh ing(200)');

May be :
document.getEle mentById("btnTw o").addEventLis tener("onclick" ,
"doSomething(20 0)",
true);

}

What if a variable is used inside the function instead of a literal ?
Like doSomething(myV ar) ? I guues I am facing some scoping problems
when using your second approach.

var i = 100;
document.getEle mentById("btnOn e").onclick = function()
{ doSomething(i); }

For some weird reason, it can't read the value of i inside the
function scope and it always shows blank. Then I tried using:

var i = 100;
document.getEle mentById("btnOn e").onclick = function(i)
{ doSomething(i); }

The above approach always gives 'i' the value of 'document.mouse event'
for no good reason.

And the attachEventList ener method as usual gives me this error:
"uncaught exception: [Exception... "Could not convert JavaScript
argument" nsresult: "0x80570009 (NS_ERROR_XPC_B AD_CONVERT_JS)"
location: "JS frame ::"

Any suggestions?

May 13 '07 #3

RobG

On May 14, 5:31 am, getsanjay.sha.. .@gmail.com wrote:

Perhaps :
document.getEle mentById("btnOn e").onclick = 'doSomething(20 0)';

Certainly :
document.getEle mentById("btnOn e").onclick = function() {
doSomething(200 );
}

or :
document.getEle mentById("btnOn e").onclick=Fun ction('doSometh ing(200)');

May be :
document.getEle mentById("btnTw o").addEventLis tener("onclick" ,
"doSomething(20 0)",
true);

}

What if a variable is used inside the function instead of a literal ?
Like doSomething(myV ar) ? I guues I am facing some scoping problems
when using your second approach.

var i = 100;
document.getEle mentById("btnOn e").onclick = function()
{ doSomething(i); }

For some weird reason, it can't read the value of i inside the
function scope and it always shows blank. Then I tried using:

var i = 100;
document.getEle mentById("btnOn e").onclick = function(i)
{ doSomething(i); }

The above approach always gives 'i' the value of 'document.mouse event'
for no good reason.

And the attachEventList ener method as usual gives me this error:
"uncaught exception: [Exception... "Could not convert JavaScript
argument" nsresult: "0x80570009 (NS_ERROR_XPC_B AD_CONVERT_JS)"
location: "JS frame ::"

Any suggestions?

You have discovered a number of things in regard to events and
closures. A good introductoin to events is at Quirskmode, and to
closures in the FAQ notes (see links below):

Quirksmode: Introduction to events (there are many pages, read them
all):
<URL: http://www.quirksmode.org/js/introevents.html >

Closures (rather long and detailed but it's all good stuff):
<URL: http://www.jibbering.com/faq/faq_notes/closures.html >
--
Rob

May 13 '07 #4

ASM

ge************* *@gmail.com a écrit :

>
What if a variable is used inside the function instead of a literal ?
Like doSomething(myV ar) ? I guues I am facing some scoping problems
when using your second approach.

var i = 100;
document.getEle mentById("btnOn e").onclick = function()
{ doSomething(i); }

Any suggestions?

May 13 '07 #5

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