CODEWITHSUNDEEP
c#javascriptasp.net.netvb.net
Mina Gabriel
Mina Gabriel

Reputation: 25080

prevent the post back vb and javascript

this is a post back problem (I don't want to use the client side to solve this issue , there must be a way to prevent the postBack then using the client side ) , i have a button when clicked it calls a javascript function from the code behind , but before it does this it post back the page , Question is : how can i skip the post back step and jump to the javascript part ??

<script type="text/javascript">
    function hello(name) {
        alert("hello world from javascript " + name)
        return false;
    }
</script>
 </head>
 <body>
<form id="form1" runat="server">
<div>
    <asp:Button ID="Button1" runat="server" Text="Button" />
</div>
</form>

code Behind : 

    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button1.Click
    Dim Myname As String = "myName"
    Dim cstype As Type = Me.GetType()
    Page.ClientScript.RegisterStartupScript(cstype, "MyKey", "hello('" & Myname & "');", True)

End Sub

Upvotes: 0

Views: 1779

Answers (4)

Adil
Adil

Reputation: 148110

  1. You should register this script in page_load or method before the button click event.

    Button1.Attributes.Add("onclick","return hello()");

  2. Use return before the call of hello method where you register script in code behind like this

    Page.ClientScript.RegisterStartupScript(cstype, "MyKey", "return hello('" & Myname & "');", True)

  3. Remove all statement from Button1_Click if you do not want postback. Or unbind server side click event

    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button1.Click

End Sub

Upvotes: 1

jrummell
jrummell

Reputation: 43067

Use a client side handler instead of a server side handler. Remove Button1_Click and add your js call as an OnClientClick attribute value.

<asp:Button ID="Button1" runat="server" Text="Button" 
            OnClientClick="return hello('myName');" />

Or, don't use a server control at all:

<button id="button1" onclick="return hello('myName');">Button</button>

Upvotes: 3

lkaradashkov
lkaradashkov

Reputation: 8889

I think you're looking to use the OnClientClick event of the button:

<asp:Button ID="Button1" OnClientClick="return hello('world')" runat="server" Text="Button" />

Upvotes: 1

theedam
theedam

Reputation: 629

Why not use a HTML button rather than an ASP button

<input id="Button1" type="button" value="button" runat="server" />

And server side write something like

Button1.Attributes.Add("onclick","hello()");

Upvotes: 1

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