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On my ASPX page, there is a button with this code:
OnClick="save_Click"
Is it possible to execute Javascript before postback and if the result is true, then do the postback and go to method save_click?
345
There is a property called "OnClientClick" as well. Here you can specify a function that will validate (I'm guessing), or just run regular javascript.
If your data is not valid you can just return false; from the method. That should cancel your postback
108
you should use the very well known way: return confirm('bla bla bla')
adding this snippet to the onclick attribute of the button in the page or button prerender method, server side...
30
http://msdn.microsoft.com/en-us/library/7ytf5t7k.aspx
<%@ Page Language="C#" %>
<script runat="server">
protected void Button1_Click(Object sender, EventArgs e)
{
Label1.Text = "Server click handler called.";
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<body>
<form id="form1" runat="server">
<asp:Button ID="Button1" Runat="server"
OnClick="Button1_Click"
OnClientClick="return confirm('Ready to submit.');"
Text="Test Client Click" />
<br />
<asp:Label ID="Label1" Runat="server" text="" />
</form>
</body>
</html>
Possible duplicate of : Execute ClientSide before ServerSide in ASP.NET
44
I changed the definition of the __doPostback function to accomplish this:
<script type="text/javascript">
var originalDoPostback = __doPostBack;
__doPostBack = function (p1, p2) {
doSomethingCustomHere();
originalDoPostback(p1, p2);
};
</script>
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