Blueimp File Upload: Remove a file from file list before upload

Question

How can I remove a file from the selected files list in Blueimp plugins before submitting the form to upload. I tried this SO answer but its just remove file from UI not from queue.

Here is my code

$(function(){
            $("#UploadPhotos").click(function(){
                $("#ItemPhotos").click();
            });
            $('#ItemPhotos').fileupload({
                    url: "${pageContext.servletContext.contextPath}/XYZ",
                    //dataType: 'json',
                    autoUpload: false,
                    acceptFileTypes: /(\.|\/)(gif|jpe?g|png)$/i,
                    maxFileSize: 5000000, // 5 MB
                    // Enable image resizing, except for Android and Opera,
                    // which actually support image resizing, but fail to
                    // send Blob objects via XHR requests:
                    disableImageResize: /Android(?!.*Chrome)|Opera/
                        .test(window.navigator.userAgent),
                    previewMaxWidth: 171,
                    singleFileUploads:false,
                    previewMaxHeight: 180,
                    previewCrop: true
                }).on('fileuploadadd', function (e, data) {
                    data.context = $('<div/>').appendTo('#FilesListThumb');
                    $.each(data.files, function (index, file) {
                        var node = $('<div><h6>X</h6></div>').addClass("thumbnail-ib");
                        node.appendTo(data.context);
                        node.find("h6").click(function(){
                            node.remove();
                        });
                    });
                    $("#itemSellForm").submit(function(){
                        data.formData = $("#itemSellForm").serializeArray();
                        data.submit();
                        return false;
                    });                        
                }).on('fileuploadprocessalways', function (e, data) {
                    var index = data.index,
                        file = data.files[index],
                        node = $(data.context.children()[index]);
                    if (file.preview) {
                        node
                            .addClass("thumbnail")
                            .append(file.preview);
                    }
                    if (file.error) {
                        node
                            .addClass("thumbnail")
                            .append($('<span class="text-danger"/>').text("Upload Failed"));
                    }
                }).on('fileuploadfail', function (e, data) {
                    $.each(data.files, function (index, file) {
                        var error = $('<span class="text-danger"/>').text('File upload failed.');
                        $(data.context.children()[index])
                            .append('<br>')
                            .append(error);
                    });
                }).on("fileuploaddone",function(e,data){
                  //  sendData = false;
                 alert("done");
                });
        });

here when I click h6 thumbnail is removed from ui only not from the list of ifles

Answer 1

Every BlueImp callback have 2 parameters: an event and a data object.

The data object contains a files array which you can edit in order to alter files that will be uploaded. So if you delete one of these array elements (array.pop, or other methods...) before submitting your request, it can be considered as removed.