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Posted 11 Oct 2013
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Avoid Multiple Form Submits

, 11 Oct 2013
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Multiple form submits can result difficulties in web applications because of unexpected behaviors like multiple entries in database. Here is a

This articles was originally at wiki.asp.net but has now been given a new home on CodeProject. Editing rights for this article has been set at Bronze or above, so please go in and edit and update this article to keep it fresh and relevant.

Multiple form submits can result difficulties in web applications because of unexpected behaviors like multiple entries in database. Here is a solution to help you avoid multiple submits.


If you are submitting the page only once then you can use,

<span><</span>form onsubmit="return Submit();"><br />
And the method is like,
<span style="FONT-STYLE:italic;"><span><</span>script type="text/javascript"><br />var flag = false;<br /><br />function Submit()<br />{<br />  if (flag)<br />  {<br />    return false;<br />  }<br />  else<br />  {<br />   flag = true;<br />   return true;<br />  }<br />}<span><br /><</span>/script></span><br />

For a single button you can use,
btnSubmit.Attributes["onclick"] = "this.disabled=true;" +<br />GetPostBackEventReference(btnSubmit);
For pages with update panels multiple submit is a real problem as page is posting asynchronously or partially.In that scenario you can use Sys.WebForms.PageRequestManager for fixing the issue,
<span style="FONT-STYLE:italic;"><span><</span>asp:ScriptManager ID="ScriptManager1" runat="server"><br /><span><</span>/asp:ScriptManager><br /><br /><span><</span>script type="text/javascript"><br /><br />Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(BeginRequest);<br /><br />function BeginRequest(sender, e)<br />{<br /> e.get_postBackElement().disabled = true;<br />}<br /><br /><span><</span>/script></span>

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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ASP.NET Community
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The ASP.NET Wiki was started by Scott Hanselman in February of 2008. The idea is that folks spend a lot of time trolling the blogs, googlinglive-searching for answers to common "How To" questions. There's piles of fantastic community-created and MSFT-created content out there, but if it's not found by a search engine and the right combination of keywords, it's often lost.

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