[](http://www.uploadify.com) # onSelectOnce Input Type:**function** Input Format:**function(event,data) {}** Required:**optional** The **onSelectOnce** option allows you to run a custom function once each time files are added to the queue. There is no default function for this option. ### Arguments **event **The event object.**** **data **An object containing details about the select operation. - **[fileCount]** - The total number of files in the queue**** - **[filesSelected]** - The number of files selected in the select operation**** - **[filesReplaced]** - The number of files that were replaced in the queue**** - **[allBytesTotal]** - The total number of bytes for all files in the queue ### Demo Javascript Code 1. $('#file_upload').uploadify({ 1.   'uploader'     : '/uploadify/uploadify.swf', 1.   'script'       : '/uploadify/uploadify.php', 1.   'cancelImg'    : '/uploadify/cancel.png', 1.   'folder'       : '/uploads', 1.   'multi'        : true, 1.   'onSelectOnce' : function(event,data){ 1.       alert(data.filesSelected + ' files were selected for upload.'); 1.     } 1. }); HTML Code 1. <inputtype="file"id="file_upload"name="file_upload"/> 1. <ahref="javascript:$('#file_upload').uploadifyUpload();">Upload Files</a> [Upload Files](#) [](#) Help keep Uploadify free and support the development of other excellent apps!  [home](#)  |  [about](#)  |  [download](#)  |  [demos](#)  |  [documentation](#)  |  [faqs](#)  |  [forums](#) ©2011 by [Reactive Apps](http://www.reactiveapps.com)