How to limit the number of dropzone.js files uploaded?

Question

Depending on the use case, how do I constrain the number of files that dropzone.js will allow?

For example, I might need to only allow 1, 2, or 4 files uploaded.

Answer 1

I'd like to point out. maybe this just happens to me, HOWEVER, when I use this.removeAllFiles() in dropzone, it fires the event COMPLETE and this blows, what I did was check if the fileData was empty or not so I could actually submit the form.

Answer 2

it looks like maxFiles is the parameter you are looking for.

https://github.com/enyo/dropzone/blob/master/src/dropzone.coffee#L667

Answer 3

Dropzone.options.dpzSingleFile = {
    paramName: "file", // The name that will be used to transfer the file
    maxFiles: 1,
    init: function() {
        this.on("maxfilesexceeded", function(file) {
            this.removeAllFiles();
            this.addFile(file);
        });
    }
};

Answer 4

You can also add in callbacks - here I'm using Dropzone for Angular

dzCallbacks = {
    'addedfile' : function(file){
        $scope.btSend = false;
        $scope.form.logoFile = file;
    },
    'success' : function(file, xhr){
        $scope.btSend = true;
        console.log(file, xhr);
    },
    'maxfilesexceeded': function(file) {
         $timeout(function() { 
            file._removeLink.click();
        }, 2000);
    }
}

Answer 5

Why do not you just use CSS to disable the click event. When max files is reached, Dropzone will automatically add a class of dz-max-files-reached.

Use css to disable click on dropzone:

.dz-max-files-reached {
          pointer-events: none;
          cursor: default;
}

Credit: this answer

Answer 6

I thought that the most intuitive single file upload process was to replace the previous file upon a new entry.

  $(".drop-image").dropzone({
    url: '/cart?upload-engraving=true',
    maxFiles: 1,
    maxfilesexceeded: function(file) {
        this.removeAllFiles();
        this.addFile(file);
    }
})