Hi,
how do we write a javascript function to add 2 numbers and call it in a command button click?


nalaka hewage

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nalaka hewage
http://nalakahewage.blogspot.com

create the function in the HTML

call it in the button click by adding an attribute in the Page_Load
button.attributes.add("onclick", "javascript:yourfucntion();")

Thanx a lot.
can u please tell me what are the other events in textboxes and buttons that we can call java script functions by adding attributes.

Example :- button - OnClick
        :- Textbox - onBlur


nalaka hewage

Hi

We can call all the in-built events of the controls using Attributes.Add. Few examples are as below:

 - onblur
 - onchange
 - onclick
 - ondblclick
 - onfocus
 - onkeydown
 - onkeypress
 - onmousedown
 - onmouseup
 - onpropertychange



Regards
Mike

hi,

I wrote a small javascript function to calculate a percentage by retrieving values 2 text boxes. it gives an error. can anybody tell me the reason for this error

Error:-
Microsoft JScript runtime error: 'document.form1.number2' is null or not an object

this is the line i got the error:-
theAnswer = ((document.form1.number2.value - document.form1.number1.value) / document.form1.number1.value * 100);

thanx




nalaka hewage

Hi Nalla!

plz check
1>document.form1.number2.value , might be you have different text field name.
2>document.form1.number2.value might be empty??
3>Always put check for the value exists or not before to perform arithmetic calculation
If possible put your form code,so that it may help us to figure out problem
Hope this will help you.


Cheers :)

vinod

Hi,
 I checked all 3 scenarios. those are alright. but I'm getting that error.



nalaka hewage

Hii Nalla!!
plz check
<script>
function getValue()
{
theAnswer = ((document.form1.number2.value - document.form1.number1.value) / document.form1.number1.value * 100);
alert(theAnswer)
}
</script>
<form name=form1>
Number1<input type=text name=number1><br>
Number2<input type=text name=number2>
<br>
<input type=button onclick="getValue()" value="calculate" name=number22>
</form>

hope this will help you


Cheers :)

vinod

Thanx a lot Vinod.


nalaka hewage