Looking at ViewState now will show no changes from the initial Page_Load. How to access the view-state values in JavaScript? When "Button" is clicked, a PostBack is caused. A Quick Primer on View State Consider a web page that consists of a Button and Label Web control and that in the Page_Load event handler the Label's Text property is set to some message, like "Hello, world!" Do the following. View State is the method to preserve the Value of the Page and Controls between round trips. navigator.platform returns the platform on which the browser is running. ViewState does not hold the controls, it holds the values of controls. Moreover, imagine that this assignment is only done on the first page visit and not on subsequent postbacks. there are several attachments to the form. Difference between SessionState and ViewState - A ViewState is a state of a page within a browser wherein the values of controls persist when post back operation is done. When the "Javascript Change" button is clicked, the client-side script alters the Text values of both Label1 and TextBox1. As we know when a html page is rendered on browser after round trips then it lost their control value. After *much* experimentation (viewstate on, viewstate off, checking eventtarget, doing unique ID lookup at page load to manually fire event, and much more) here was the skinny--it wasn't viewstate at all. How to set a HTML document's background color in JavaScript? View State is turned on by default and normally serializes the data in every control on the page regardless of whether it is actually used … When another page is loaded, the previous page data is no longer available. In older versions of ASP.NET, there was an option to “EnableViewStateMac” that would allow you to configure whether ViewState was protected against tampering with a Message Authentication Code (MAC – true setting). How to set a HTML document's background color? The CORS policy is enforced by the browser. - SessionState is the data of a user session and is maintained on the server side. Add another textbox and button control on to the page. This is the Base64 encoded string which we will be decoding. General Notice: If you find plagiarised (copied) content on this page, please let us know original source along with your correct email id (to communicate) for action. Am I missing something in what you have provided? As a secondary configuration option, ViewState was encrypted if the “ViewStateEncryptionMode” was set to true. It is a Page-Level State Management technique. It does not restore the value to control after page post back. The page has not been posted back, and Javascript cannot alter ViewState, so this is no surprise. It is one of the Client side state management technique. are there additional steps or commands? Rename the textbox to ‘txtViewState’ and set its ‘TextMode’ property to ‘Multiline’. That is used in Asp.Net. the edited javascript is what you have provided ~ event.target.viewState = {overViewMode:7}; i get no results. A CORS policy is a set of HTTP response headers. ViewState is the method that is used in ASP.NET to preserve page and control value or we can say it is technique to persist the data of page or control value between round trips. ViewState is used to store user data on page at the time of post back of web page. ViewState can hold the value on single web page, if we go to other page using response.redirect then ViewState will be null. Set the text property of the button control to ‘View ViewState’ as shown below: < To allow the browser to make a cross domain request from foo.app.moxio.com to sso.moxio.com we must set up a CORS policy on the target domain. Rather, the stupid repeater control is (apparently) reloading the control set … If you don't control the target domain you wont be able to set a CORS policy, look at alternatives to CORS. 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