Ajax Observe Field - Dependent PopUp List Example


AjaxUpdateContainer has an optional 'observeFieldID' binding. You can set this binding to the id of the element to observe. When the element changes, the observed value will be sent back to the server (as a "partial form submission"), and the AjaxUpdateContainer will be updated. This feature requires that you use the ERExtensions framework (due to required changes to WOForm). With partial form submission, only the observed field's value is submitted back to the server so that you can attempt to avoid validation failures that might occur if the entire form was submitted.


This can be used to create dependent PopUpButtons like in the following example: