How can I add a client-side (JavaScript) confirmation message box using ASP.NET?
How might I add a JavaScript message box with a confir开发者_如何学Pythonmation option in ASP.NET?
Try using confirm :
<script>
var userWantsToContinue = confirm("do you want to continue ?");
</script>
The below uses client side messagebox and redirects to a page test.aspx only if textbox contain some value.
In default.aspx:
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
<script>
function validate_this()
{
if (document.getElementById("TextBox1").value.length == 0)
{
return false;
}
else
{
return confirm('Do you wish to continue');
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="Button1" runat="server" Text="Button" OnClientClick = "javascript:return validate_this();"/>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox></div>
</form>
</body>
</html>
In default.aspx.vb:
Partial Class _Default
Inherits System.Web.UI.Page
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
If TextBox1.Text <> "" Then
Response.Redirect("test.aspx")
End If
End Sub
End Class
Use Javascript's confirm() method.
if(confirm('Are you sure?')) {
// executed if the user clicks OK
}
If you are needing to add a confirm dialog box when the user clicks a button (such as a Delete button), where clicking Cancel has the effect of canceling a postback, you can use the Button control's OnClientClick property like so:
OnClientClick="return confirm('This will permanently delete this item. Are you sure you want to do this?');"
For more information on working with client-side script in an ASP.NET WebForms application, check out: Client-Side Enhancements in ASP.NET.
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