Avoid Multiple Form Submits

Flickr Tags: Avoid Multiple Form Submits

 

Multiple form submits is a serious issue in web applications because it’ll result in unexpected behavior like multiple entries in database .I have spent some time for the same in Google and I got some solutions for that.
If you are submitting the page only once then you can use,

<form onsubmit="return Submit();">

And the method is like,

 

<script type="text/javascript">

var flag = false;

function Submit() {

if (flag) {

return false;

}

else {

flag = true;

return true;

}

}

</script>

For a single button you can use,

btnSubmit.Attributes["onclick"] = "this.disabled=true;" + GetPostBackEventReference(btnSubmit);

 

For pages with update panels multiple submit is a serious issue as page is posting asynchronously or partially.In that scenario you can use Sys.WebForms.PageRequestManager for fixing the issue,

<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<script type="text/javascript">
Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(BeginRequest);
function BeginRequest(sender, e) {
e.get_postBackElement().disabled = true;
}
</script>