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07.13.2008 at 03:34AM PDT, ID: 23560607
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9.7

making a function relative to the input box it is called from - using "this"?

Asked by codeQuantum in JavaScript, JScript

Hi experts,

Right now I am using the following function to turn text in an input field into uppercase. Problem is, I will use this function on multiple fields and I want to make it dynamic. I don't want to have to specify the form/field name in the javascript code.

Ideally, I would like something in the style of : function upCase() { this.value = this.value.toUpperCase() }

I thought "this" would point to the current input box, but it does not work.

In short :

1) how to make the javascript code dynamic
2) why using this.value does not work? (I would appreciate a detailed explanation of how "this" works.)Start Free Trial 
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// javascript
function upCase()
{
	str = document.forms["form"]["uls"].value;
	document.forms["form"]["uls"].value = str.toUpperCase();
}
 
// html
<input name="uls" type="text" id="uls" value="JJ13" size="22" onkeyup="upCase();" />
[+][-]07.13.2008 at 03:38AM PDT, ID: 21991937

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About this solution

Zones: JavaScript, JScript
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Solution Provided By: hernst42
Participating Experts: 1
Solution Grade: A
 
 
[+][-]07.13.2008 at 03:45AM PDT, ID: 21991953

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