I have created a button, and in the action tab selected "mouse up", and "run a javascript." When another page is loaded, the previous page data is no longer available. How to set a HTML document's background color in JavaScript? View State is the method to preserve the Value of the Page and Controls between round trips. If you don't control the target domain you wont be able to set a CORS policy, look at alternatives to CORS. ViewState can hold the value on single web page, if we go to other page using response.redirect then ViewState will be null. The page has not been posted back, and Javascript cannot alter ViewState, so this is no surprise. When "Button" is clicked, a PostBack is caused. As we know when a html page is rendered on browser after round trips then it lost their control value. Rather, the stupid repeater control is (apparently) reloading the control set … ViewState is used to store user data on page at the time of post back of web page. Rename the textbox to ‘txtViewState’ and set its ‘TextMode’ property to ‘Multiline’. - SessionState is the data of a user session and is maintained on the server side. are there additional steps or commands? 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 … 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). Am I missing something in what you have provided? When the "Javascript Change" button is clicked, the client-side script alters the Text values of both Label1 and TextBox1. It is one of the Client side state management technique. This is the Base64 encoded string which we will be decoding. Looking at ViewState now will show no changes from the initial Page_Load. navigator.platform returns the platform on which the browser is running. A CORS policy is a set of HTTP response headers. there are several attachments to the form. Moreover, imagine that this assignment is only done on the first page visit and not on subsequent postbacks. 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. How to access the view-state values in JavaScript? 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. This article describes ASP.NET view state and shows with an example how view state works in ASP.NET. the edited javascript is what you have provided ~ event.target.viewState = {overViewMode:7}; i get no results. It does not restore the value to control after page post back. Do the following. The CORS policy is enforced by the browser. As a secondary configuration option, ViewState was encrypted if the “ViewStateEncryptionMode” was set to true. 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. 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. Set the text property of the button control to ‘View ViewState’ as shown below: < It is a Page-Level State Management technique. How to set a HTML document's background color? That is used in Asp.Net. Add another textbox and button control on to the page. ViewState does not hold the controls, it holds the values of controls. 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