Execute ClientSide before ServerSide in ASP.NET

问题

I am using ASP.NET 3.5.

When the user click on say btnSubmit I want to first execute some JavaScript code and then execute some C#/VB.NET code.

Is this possible? If so how would one do it?

Thanks in advance!

回答1:

This is very simple:

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>

回答2:

Have the JavaScript execute and then call a web service with xmlhttprequest from the javascript

回答3:

There is onClientClick property - check this out http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.button.onclientclick.aspx

回答4:

Of course, you simply add an onClick event all JS code is executed before the postback.

If the code is for validation and you decide you don't want to submit you can return false and it won't post.

<asp:Button OnClientClick="" />

回答5:

Thanks for the answer guys!

To execute a function from code behind one would do this in VB.NET

 Protected Sub btnSubmit_Click(blah blah) Handles btnSubmit.Click

    ClientScript.RegisterStartupScript(Me.GetType(), "hiya", "Message()", True)
    lblLabel.Text = "Hello my name is Etienne!"

End Sub

来源：https://stackoverflow.com/questions/3415215/execute-clientside-before-serverside-in-asp-net

标签

javascript

ASP.NET

vb.net

code-behind