Dropzone: prevent uploading of duplicate files

Question

I am using Dropzone. I\'d like to prevent the uploading of a file which already exists as thumbnail in Dropzone \"panel\". With uploading I mean not to allow a file with the

Answer 1

Add these simple lines of code:

myDropzone.on("addedfile", function(file) {
    if (this.files.length) {
        var _i, _len;
        for (_i = 0, _len = this.files.length; _i < _len - 1; _i++) // -1 to exclude current file
        {
            if(this.files[_i].name === file.name && this.files[_i].size === file.size && this.files[_i].lastModifiedDate.toString() === file.lastModifiedDate.toString())
            {
                this.removeFile(file);
            }
        }
    }
});