[Javascript] Programmatically set onchange event for textbox

[Terry Riegel]

The library prototype.js has a form observer that should do exactly  
what you need.

The documentation for prototype doesn't exist, so others have tried  
to fill in the missing info. This article explains how to use the  
library to observe a form. I like the library as a lot of the cross  
browser issues are taken care of.

http://www.sitepoint.com/article/painless-javascript-prototype/2


Terry


On Oct 4, 2006, at 1:24 AM, Brian L. Matthews wrote:

>> <input name="txtCardNumber" type="text" maxlength="16"  
>> id="txtCardNumber" />
>> [...]
>> So, I have the following code and when the page loads, I do get  
>> the "Textbox
>> found" message. However, when I type in the text box, I do not get  
>> the "Card
>> Number Typed" alert.
>
> onchange only fires when the field loses focus (i.e. you tab out or  
> click the page somewhere outside the field). That's often  
> sufficient (it usually doesn't make sense to do field validation on  
> a partially typed field). If you want to validate the first digit  
> as soon as it's typed, look into the onkey events, but make sure  
> you read about browser compatibility (<http://www.quirksmode.org/>  
> is a good site, I'm sure there are others).
>
> Brian
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