Raised when the upload is about to be started.
<script type="text/javascript" src="iuembed.js"> </script> <script type="text/javascript"> function ImageUploaderID_BeforeUpload() { //...your code... } var iu = new ImageUploaderWriter("ImageUploaderID", 610, 500); //...params... //...other event listeners... iu.addEventListener("BeforeUpload", "ImageUploaderID_BeforeUpload"); //...other event listeners... iu.writeHtml(); </script>
A boolean value (true or false). If event handler returns false (or zero), the upload is cancelled.
Otherwise, upload begins immediately after the event handler finishes. This makes the event
handler convenient for validating additional data provided by user.