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All controls accept Button and ImageButton use JavaScript for causing a postback. To enable postback on these controls one has to set AutoPostBack property to true. When you set this property to true, __doPostBack function is called on event which causes a postback.
asp:Button is an asp.net server control which fire an event on the server side. <input id="Submit1" type="submit" is a client side button of type submit, but it can act as a server side button as well by adding. runat="server" and onserverclick="eventname"
Have your javascript return false when it's done.
<asp:button runat="server".... OnClientClick="myfunction(); return false;" />
YourButton.Attributes.Add("onclick", "return false");
or
<asp:button runat="server" ... OnClientClick="return false" />
You can use jquery click action and use the preventDefault() function to avoid postback
<asp:button ID="btnMyButton" runat="server" Text="MyButton" />
$("#btnMyButton").click(function (e) {
// some actions here
e.preventDefault();
}
Consider this.
<script type="text/javascript">
Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(BeginRequest);
function BeginRequest(sender, e) {
e.get_postBackElement().disabled = true;
}
</script>
The others are right that you need your callback to return false; however I'd like to add that doing it by setting the onclick is an ugly old way of doing things. I'd recommend reading about unobtrusive javascript. Using a library like jQuery could make your life easier, and the HTML less coupled to your javascript (and jQuery's supported by Microsoft now!)
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