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[![Uploadify - JQuery File Upload Plugin Script](https://box.kancloud.cn/2015-11-02_5636cc82d8b6c.png)](http://www.uploadify.com) # checkScript Input Type:**string** Input Format:**null** Default:**null** Required:**optional** The **checkScript** option allows you to check the upload folder for any files that exist with the same name as any files that are in the queue for upload. The back-end script should return a JSON encoded array of the matching file names in order for this option to work. ### Demo Javascript Code 1. $('#file_upload').uploadify({ 1.   'uploader'    : '/uploadify/uploadify.swf', 1.   'script'      : '/uploadify/uploadify.php', 1.   'cancelImg'   : '/uploadify/cancel.png', 1.   'folder'      : '/uploads' 1. }); HTML Code 1. <inputtype="file"id="file_upload"name="file_upload"/> 1. <ahref="javascript:$('#file_upload').uploadifyUpload();">Upload Files</a> [Upload Files](#) [![Download the Latest Version](https://box.kancloud.cn/2015-11-02_5636cc82ea7d9.png)](#) Help keep Uploadify free and support the development of other excellent apps! ![](../image/564003e1de21f.gif) [home](#)  |  [about](#)  |  [download](#)  |  [demos](#)  |  [documentation](#)  |  [faqs](#)  |  [forums](#) ©2011 by [Reactive Apps](http://www.reactiveapps.com)