Here I will explain how to disable browser back button functionality using JavaScript in asp.net.
Description
One day I got requirement like disable browser back button to prevent users going back to previous page using back button of the browser. I search many sites for proper code to prevent users navigating back to previous page but there is no use because some of them work in IE but not in Mozilla and some of them will work in Mozilla but not in IE.
Here this JavaScript functionality will work in all browsers and prevent users navigating back to previous page by hitting on browser back button check below piece of JavaScript code
<script type="text/javascript" language="javascript">
function DisableBackButton() {
window.history.forward()
}
DisableBackButton();
window.onload = DisableBackButton;
window.onpageshow = function(evt) { if (evt.persisted) DisableBackButton() }
window.onunload = function() { void (0) }
</script>
|
We need to place above script in header section of a page wherever we need to prevent users navigate back to another page by using browser back button.
I will explain our requirement with an example I have two pages Defaul1.aspx and Default2.aspx now I will redirect from Default1.aspx page to Defaul2.aspx page. After come from Defaul1.aspx page to Default2.aspx if I try to navigate back to Default1.aspx page from Defaul2.aspx then I want prevent user navigate back to previous page (Defaul1.aspx). To achieve this functionality place above JavaScript function in header section of required page.
After add our JavaScript functionality to our page that code will be like this
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Disable Browser Back buttons</title>
<script type="text/javascript" language="javascript">
function DisableBackButton() {
window.history.forward()
}
DisableBackButton();
window.onload = DisableBackButton;
window.onpageshow = function(evt) { if (evt.persisted) DisableBackButton() }
window.onunload = function() { void (0) }
</script>
</head>
<body >
<form id="form1" runat="server">
<div>
First Page
</div>
<div>
<asp:Button id="btnFirst" runat="server" Text="Go to First Page" PostBackUrl="~/Default.aspx" />
<asp:Button ID="btnSecond" runat="server" Text="Go to Second Page" PostBackUrl="~/Default2.aspx" />
<asp:Button ID="btnThree" runat="server" Text="Go to Third Page" PostBackUrl="~/Default3.aspx" />
</div>
</form>
</body>
</html>
|
We can also achieve this by disabling browser caching in code behind write the following lines of code in Page_Init event or Page_Load event and don’t forgot to add namespace using System.Web; because HttpCacheability related to that namespace.
protected void Page_Init(object sender, EventArgs e)
{
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.Cache.SetExpires(DateTime.Now.AddSeconds(-1));
Response.Cache.SetNoStore();
}
|
We need to place this code in a page wherever we need to disable browser back button. If we use above caching method to disable browser back button that will display webpage expired message like this
 |
No comments:
Post a Comment