Question

I have a custom control that has the following prototype.

Type.registerNamespace('Demo');  Demo.CustomTextBox = function(element) {     Demo.CustomTextBox.initializeBase(this, [element]); }  Demo.CustomTextBox.prototype = {      initialize: function() {     Demo.CustomTextBox.callBaseMethod(this, 'initialize');          this._onblurHandler = Function.createDelegate(this, this._onBlur);          $addHandlers(this.get_element(),                      {                          'blur': this._onBlur                      },                      this);     },      dispose: function() {         $clearHandlers(this.get_element());          Demo.CustomTextBox.callBaseMethod(this, 'dispose');     },      _onBlur: function(e) {         if (this.get_element() && !this.get_element().disabled) {             alert(this.get_element().value);         }     } }  Demo.CustomTextBox.registerClass('Demo.CustomTextBox', Sys.UI.Control);  if (typeof (Sys) !== 'undefined') Sys.Application.notifyScriptLoaded(); 

How can i raise a post back event to the server in the _onBlur method?

Cheers

Rohan

Answer 1

You can use the __doPostBack method to do this, which has a signature of:

function __doPostBack(eventTarget, eventArgument) 

So it would be something along the lines of:

__doPostBack(this.get_element().id, 0); 

Or you can optionally pass an argument along with the event if desired.