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I created a File Uploader using the following code. My backend uses Struts2 . I am using the following code to upload but my Struts action is not getting invoked. For convenince I only pasted important pieces of the code.Can someone help me with this.Also how do we return the progress from the backend?

YUI({filter:"raw"}).use("uploader", function(Y) {
//Y.one("#overallProgress").set("text", "Uploader type: " + Y.Uploader.TYPE);
if (Y.Uploader.TYPE != "none" && !Y.UA.ios) {
var uploader = new Y.Uploader({width: "250px",
height: "35px",
multipleFiles: true,
swfURL: "http://yui.yahooapis.com/3.5.1/build/uploader/assets/flashuploader.swf?t=" + Math.random(),
simLimit: 2
});
var uploadDone = false;

uploader.render("#selectFilesButtonContainer");

uploader.after("fileselect", function (event) {

var fileList = event.fileList;
var fileTable = Y.one("#filenames tbody");
if (fileList.length > 0 && Y.one("#nofiles")) {
Y.one("#nofiles").remove();
}

if (uploadDone) {
uploadDone = false;
fileTable.setHTML("");
}

Y.each(fileList, function (fileInstance) {
fileTable.append("<tr id='" + fileInstance.get("id") + "_row" + "'>" +
"<td class='filename'>" + fileInstance.get("name") + "</td>" +
"<td class='filesize'>" + fileInstance.get("size") + "</td>" +
"<td class='percentdone'>Hasn't started yet</td>");
});
});

Y.one("#uploadFilesButton").on("click", function () {
if (!uploadDone && uploader.get("fileList").length > 0) {
uploader.uploadAll("http://localhost:8080/YUITest/uploadNominationDocs");

}
});
}
else {
Y.one("#uploaderContainer").set("text", "We are sorry, but the uploader technology is not supported" +
" on this platform.");
}


});

</script>