Search code examples
asp.nettriggersupdatepanel

What is the difference between AsyncPostBackTrigger & PostBackTrigger?

What is the difference between AsyncPostBackTrigger & PostBackTrigger?

Solution

  • Controls inside an UpdatePanel by default cause a partial page update, controls outside cause a postback, using these triggers it is possible to change this behaviour as required.

    From http://seminaarit.codezone.fi/video/devdays-2007/track1/2/2-ASP-dotNET_AJAX_Extensions.ppt: (dead link)

    AsyncPostBackTrigger

    • Converts postbacks into async callbacks * Typically used to trigger updates when controls outside an UpdatePanel post back * If ChildrenAsTriggers="false", can be used to specify which controls inside UpdatePanel should call back rather than post back

    PostBackTrigger

    • Lets controls inside UpdatePanel post back. * Typically used to allow certain controls to post back when ChildrenAsTriggers="true"