Steven,
Start with something like this:
zipcodeField.add(new OnChangeAjaxBehavior() {
@Override protected void onUpdate(AjaxRequestTarget target) {
// do your stuff here
}
@Override protected IAjaxCallDecorator getAjaxCallDecorator() {
return new AjaxCallDecorator() {
@Override public CharSequence decorateScript(CharSequence script) {
return "if(this.value.length % 5 == 0){" + script + "}";
}
};
}
});
Regards - Cemal
jWeekend
OO & Java Technologies, Wicket
Consulting, Development, Training
http://jWeekend.com
On 12 February 2010 20:45, Steven Haines <[email protected]> wrote:
> Hi,
>
> I
> would like to add AJAX behavior to an application that sends an update
> to my application after a certain number of characters have been typed.
> For example, if the user is entering a zipcode, I would like a callback
> to my application to be made after the user enters the fifth character.
>
> I've
> written code using OnChangeAjaxBehavior that sends messages back to my
> application after every character has been typed, such as the following:
>
> final TextField<String> zipcodeField = new TextField<String>( "zipcode" );
> form.add( zipcodeField.setRequired( true ) );
> OnChangeAjaxBehavior zipcodeUpdated = new OnChangeAjaxBehavior() {
> �...@override
> protected void onUpdate( AjaxRequestTarget target ) {
> System.out.println( "Zipcode value: " +
> zipcodeField.getDefaultModelObjectAsString() );
> }
> };
> zipcodeField.add( zipcodeUpdated );
>
>
> I
> could check to see the size of the zipcodeField (in this example), but
> it makes my application more chatty than it needs to be. I also tried
> using onblur, which works fine, but does not satisfy my business
> requirements:
>
> final TextField<String> zipcodeField = new TextField<String>( "zipcode" );
> form.add( zipcodeField.setRequired( true ) );
>
> AjaxFormComponentUpdatingBehavior zipcodeOnBlur = new
> AjaxFormComponentUpdatingBehavior( "onblur" ) {
> �...@override
> protected void onUpdate( AjaxRequestTarget target ) {
> System.out.println( "Zipcode value (form component): " +
> getFormComponent().getModelObject() );
> }
> };
> zipcodeField.add( zipcodeOnBlur );
>
>
>
> Prior
> to using Wicket (which I'm currently prototyping for my company), we
> would handle this logic in JavaScript (observe changes to the field and
> when the user enters the fifth character then we made an AJAX call back
> our Struts 2 application.)
>
> What is the best way to achieve the same end using Wicket?
>
> Thanks, in advance, for your help!
> Steve
>
> P.S.
> I started using Wicket as part of an article series (because of all of
> your passion for it) and I have to say all of you are doing incredible
> work - I love it.. Here's the link to the article series in case any of
> you are interested:
> http://www.informit.com/guides/content.aspx?g=java&seqNum=529
>
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