asp.net - intercept __doPostBack function -
according post can intercept post overriding function __dopostback wont work. if view generated source not able see function meant auto generated , causes asp.net make postback.
where function? , how intercept it?
i'm using asp.net 4 , vs 2012
default.aspx
<%@ page language="vb" autoeventwireup="false" codefile="default.aspx.vb" inherits="_default" %> <!doctype html> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> <script> //breaks here cant find __dopostback var __original = __dopostback; __dopostback = myfunction(); function myfunction() { alert('intercept'); } </script> </head> <body> <form id="form1" runat="server"> <div> <asp:textbox id="textbox1" runat="server" ></asp:textbox> <asp:button id="button1" runat="server" text="button" /> </div> </form> </body> </html> default.aspx.vb
partial class _default inherits system.web.ui.page protected sub form1_load(sender object, e eventargs) handles form1.load end sub protected sub button1_click(sender object, e eventargs) handles button1.click dim txt string = textbox1.text end sub end class
an asp.net button renders <input type="submit" /> postback form, , never use method. __dopostback method used elements not input buttons not cause post operation server. function that's inside 1 of microsoft's javascript file, , gets rendered out on client. common uses __dopostback linkbutton controls, controls may have autopostback="true", , others.
also, there may call webforms_dopostback... named that posts back, internally calls __dopostback.
if trying prevent postback on click of button, attach submit event of form, , cancel postback operation way.
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