Use javascript to determine if an ASP.NET page is a postback

Question

Is it possible to determine if an ASP.NET page is a postback from javascript? So basically a javascript equivalent of C# Page.IsPostBack.

Thanks.

moinudin · Accepted Answer · 2011-03-10 08:12:07Z

14

I would just put a render tag in the javascript

var isPostBack = <%= Page.IsPostBack ? "true" : "false" %>;

Putting the "true" and "false" as strings should be done to eliminate any possible issues converting the type to a string as in C# true.ToString() is usually "True" which is an error in javascript.

edited Mar 10, 2011 at 8:12

moinudin

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answered Jan 2, 2009 at 16:05

Bob

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2 Comments

Kieran Senior Over a year ago

This is something we do as well, very handy +1

patridge Over a year ago

Of course, at this point, it is technically "wasPostBack". :P

Joel Coehoorn · Accepted Answer · 2009-01-02 16:05:48Z

2

Sure. Just use your server code to write out a javascript flag, if you really need this.

But I suspect you're barking up the wrong tree here.

answered Jan 2, 2009 at 16:05

Joel Coehoorn

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Comments

Robb C · Accepted Answer · 2009-01-06 17:02:47Z

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I'm not exactly sure of what you are trying to do but you might want to look into the PageRequestManagerClass:

http://www.asp.net/AJAX/Documentation/Live/ClientReference/Sys.WebForms/PageRequestManagerClass/default.aspx

It exposes events for all different parts of the request.

answered Jan 6, 2009 at 17:02

Robb C

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