Question

My AutoCompleteTextField (getChoices method implemented and working):

AutoCompleteTextField<String> objectDescription = new AutoCompleteTextField<String>("objectDescription") { 
     getChoices() {...}
}

To this textfield I add:

objectDescription.add(new OnChangeAjaxBehavior()) {
     onUpdate() {....}
}

The onUpdate method gets called everytime I write something in my textfield but not when I choose some item from the autocomplete menu. The string from the menu is written to the textfield but only calls the onUpdate when another change is made.

Edit: Before Wicket 1.5 this was working.

Answer 1

Add an AjaxFormComponentUpdatingBehavior("onchange").

The OnChangeAjaxbehavior() seems to fire at every change (uses the Javascript Wicket.ChangeHandler), like in every key press.

Using an AjaxFormComponentUpdatingBehavior will add the event listener to onChange javascript events, like in focusing out of the textfield with a different value, or in selecting a value from the autocomplete list.

Still not sure why doesn’t OnChangeAjaxbehavior extends AjaxFormComponentUpdatingBehavior inherit this logic from AjaxFormComponentUpdatingBehavior, there must be something it’s overriding.

UPDATE This might well be the reason why onchange javascript events are being ignored when using OnChangeAjaxBehavior. The source code for Wicket.ChangeHandler, found in wicket-ajax.js, sets handlers for different events:

• Backs up the onchange event handler in onchangeoriginal:

obj.onchangeoriginal = obj.onchange

• If the browser is IE, Safari, and some other, it assigns the original onchange event handler to onKeyUp, onpaste and oncut.
• If not, it assigns the original onchange event handler to onInput.

• Finally, it always removes the onchange event handler:

  obj.onchange = function(event){
      Wicket.stopEvent(event);
  }

The code in wicket-autocomplete.js seems to be manually firing the onchange event handler at item selection. Probably it should be checking for obj.onchangeoriginal first.

So, being this js executed in OnDomReady, I doubt it’s possible to make those two behaviors coexist. Maybe it’s time to file a new JIRA?

This might be a slightly related issue: WICKET-2424: OnChangeAjaxBehavior + DatePicker do not work together