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Friday, July 2, 2010

Firing an ASP.NET postback for a control on page load

The following can be used to automatically fire the post back event from an ASP.NET control when the page is done loading client side. Using ClientScript.GetPostBackEventReference() avoids the need to manually create the __doPostBack script using the controls client id.

    string triggerScript = ClientScript.GetPostBackEventReference(this.btnRefreshData, string.Empty);
    Page.ClientScript.RegisterStartupScript(this.GetType(), "PostbackControlScript", triggerScript, true);

If using an UpdatePanel with partial postback use the following instead:

    string triggerScript = ClientScript.GetPostBackEventReference(this.btnRefreshData, string.Empty);
    if(ScriptManager.GetCurrent(Page).IsInAsyncPostBack)
    {
        ScriptManager.RegisterStartupScript(this.btnRefreshData, this.GetType(), "PostbackControlScriptUpdate", triggerScript, true);
    }
    else
    {
        Page.ClientScript.RegisterStartupScript(this.GetType(), "PostbackControlScript", triggerScript, true);

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