// Copyright 2011 ESRI
// 
// All rights reserved under the copyright laws of the United States
// and applicable international laws, treaties, and conventions.
// 
// You may freely redistribute and use this sample code, with or
// without modification, provided you include the original copyright
// notice and use restrictions.
// 
// See the use restrictions.
// 

using System;
using System.Collections.Generic;
using System.Text;

namespace ADFWebPart
{
    public abstract class AJAXSharePointWebPart: System.Web.UI.WebControls.WebParts.WebPart
    {
        protected override void OnInit(System.EventArgs e)
        {
            base.OnInit(e);

            // Fix problem with postbacks and form actions (DevDiv 55525)
            Page.ClientScript.RegisterStartupScript(GetType(), this.ID, "_spOriginalFormAction = document.forms[0].action;", true);

            // By default, the onsubmit event for forms in SharePoint master pages call "return _spFormOnSubmitWrapper()" 
            // which blocks async postbacks after the first one.   Not calling "_spFormOnSubmitWrapper()" breaks all postbacks
            // and defeats the purpose of _spFormOnSubmitWrapper() which is to block repetitive postbacks.  
            // To call _spFormOnSubmitWrapper() and allow partial postbacks, remove "return" from the original call.  
            if (this.Page.Form != null)
            {
                string formOnSubmitAtt = this.Page.Form.Attributes["onsubmit"];
                if (!string.IsNullOrEmpty(formOnSubmitAtt) && formOnSubmitAtt == "return _spFormOnSubmitWrapper();")
                {
                    this.Page.Form.Attributes["onsubmit"] = "_spFormOnSubmitWrapper();";
                }
            }
        }

    }
}