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