Delete files programmatically with jquery fileupload basic

Question

I\'m using the blueimp file upload plugin (the basic version) to implement multifile upload. I am trying to implement functionality to allow the user to remove queued files for

Answer 1

I solved this. Here is the solution with description:

I found my solution after tinkering with it some more. The key was remembering that I was in a call back. So in the event handler for the remove functionality, I just zeroed out the data.files array, and in the submit for that handler, I only submit if the files array has a length greater than 0. I cleaned up the event handler function so it's easier on the eyes. HTML is unchanged.

New JavaScript handling code:

 $('#myForm').fileupload({
            url: "/SomeUrl",
            dataType: 'html',            
            add: function (e, data) {
                $.each(data.files, function (index, file) {
                    var newFileDiv = $("<div class='uploadBox' id='fileDiv_" + file.name + "'><div class='leftEle'><a href='#' id='link_" + index + "' class='removeFile'>Remove</a></div><div class='midEle'>" + file.name + "</div></div>");
                    $('#uploadFilesBox').append(newFileDiv);

                    newFileDiv.find('a').on('click', { filename: file.name, files: data.files }, function (event) {                        
                        event.preventDefault();
                        var uploadFilesBox = $("#uploadFilesBox");
                        var remDiv = $(document.getElementById("fileDiv_" + event.data.filename));
                        remDiv.remove();                        
                        data.files.length = 0;    //zero out the files array                                     
                    });

                    data.context = newFileDiv;
                });

                $('#myButton')
                    .click(function () {
                        if (data.files.length > 0) {     //only submit if we have something to upload
                            data.submit();
                        }                                                    
                    });
            }
});

Answer 2

Thanks for that @Furynation.

What I did was similar to your approach. For every file I select I add a row to a table(pre upload submission). This row I assign to the data.context to use for later use.

See: https://github.com/blueimp/jQuery-File-Upload/issues/3083

My code snippet is in the add callback handler:

 $("#upload").click(function () {
                 if (data.files.length > 0) { 
                     data.submit();
                 }
            });
            data.context.find('a').on('click',function (event) {  
                event.preventDefault();
                data.context.remove();   
                data.files.length = 0;   
            });

This removes the table row and resets the array.

If there is a cleaner way, please let me know.

Answer 3

Works for me for multiple files - it checks all files and doesn't break when file with error is one in the middle of all files (like .splice() or .lenght=0 do). Idea is: do validation -> if error: mark index of file with error -> after all files/before upload: remove/delete wrong indexes/files by $.grep() -> upload good files together singleFileUploads: false.

$(this).fileupload({
        // ...
        singleFileUploads: false,   // << send all together, not single
        // ...
        add: function (e, data) {

            // array with all indexes of files with errors
            var error_uploads_indexes = [];

            // when add file - each file
            $.each(data.files, function(index, file) {

                // array for all errors - in example is only one: size
                var uploadErrors = [];

                // ... validation

                        // check size
                        if(data.files[index]['size'] > 1048576) {
                            uploadErrors.push('Filesize is too big');
                        };
                // ...

                // when errors
                if(uploadErrors.length > 0) {

                    // mark index of error file
                    error_uploads_indexes.push(index);
                    // alert error
                    alert(uploadErrors.join("\n"));

                };

            }); // << each


            // remove indexes (files) with error
            data.files = $.grep( data.files, function( n, i ) {
                return $.inArray(i, error_uploads_indexes) ==-1;
            });


            // if are files to upload
            if(data.files.length){
                // upload by ajax
                var jqXHR = data.submit().done(function (result, textStatus, jqXHR) {
                        //...
                     alert('done!') ;
                        // ...
                });
            } // 

        },
        // ...
    }); // << file_upload