How to cancel/abort upload in Dropzone.js if condition is not fulfilled?

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I'm using Dropzone.js to upload files. Now I want to check a filed is filled or not, and if it isn't then cancel the upload.

My HTML code:

<input type="text" name="title" id="title" placeholder="Type the title of the album">
<form action="file-upload.cgi" enctype="multipart/form-data" class="dropzone" id="dropzoneform"></form>

My jQuery code:

Dropzone.autoDiscover = false;
    acceptedFiles: 'image/jpeg',
    init: function() {
        this.on('sending', function() {
            if ( $('#title').val().length > 0 ) {
                // just start automatically the uploading
            } else {
                // need a code to cancel the uploading

How can I cancel the uploading when the #title's length is 0?

What about this

Dropzone.autoDiscover = false;
    acceptedFiles: 'image/jpeg',
    init: function() {
        var that = this;
        that.on('sending', function(file) {
            if ( $('#title').val().length <= 0 ) {

Dropzone.js, › meno › dropzone › blob › src › 13 How to disable clickable the form with Dropzone.js? 11 File upload progress checking 8 How to cancel/abort upload in Dropzone.js if condition is not fulfilled?

The accepted answer works if you want to remove the file completely; however, if you want to give the user the option to try and submit the same file again without having to re-add it to dropzone, you need to change a few things about how files are processed.

First, you need to set the autoQueue property to false when you initialize your dropzone:

    autoQueue: false,
    /* The rest of your configuration options */

This prevents Dropzone from automatically trying to upload every file right after it's added by the user. This means that now you have to actually enqueue the files yourself programmatically, using the following function:

 var yourDropzone = $('.dropzone');
 yourDropzone.on("addedfile", function(file) {
     if (/* some condition is met by your file */) {

This way, whenever the user selects a file for uploading, we can check if some arbitrary condition is met. Only when this is true, we enqueue the file for uploading to the server.

The advantage of this approach is that now we can actually choose when the file gets uploaded, rather than trying to remove it from the queue while Dropzone is trying to send the enqueued files.

This also allows for other fancier features; for instance, adding a button for each file that lets the user choose when to try and upload it.

src/, When the filename exceeds this limit, the thumbnail will not be If `​addRemoveLinks` is true, the text to be used for the cancel upload resizeMethod, done else done file # A string that contains the template used for each dropped # file. Change it to fulfill your needs but make sure to properly # provide all  I'm using dropzone.js to upload to my website. The uploader is in a modal, which I want to automatically close when all files have been uploaded successfully. To do this I am using the following c

If the solution of the accepted answer throw this error :

InvalidStateError: An attempt was made to use an object that is not, or is no longer, usable


myDropzone.on("addedfile", function(file) {
if (/* some condition is NOT met by your file */) {

It's a mix between accepted answer and Protossoario's answer. Without queuing the file. The accepted answer is actually throwing this js error in my config.

User Lalo Sánchez, 27 How to cancel/abort upload in Dropzone.js if condition is not fulfilled? 13 Can't hide titlebar Titanium with Alloy · 13 How to add text input to dropzone upload  ERROR [Jsr168Dispatcher:38] Could not find action There is no Action mapped for action name default. How to cancel/abort upload in Dropzone.js if condition is not fulfilled? Alternatives to hidden fields in MVC2; Shift Date not updated as Sit date; org.hibernate.QueryException: could not resolve property: filename; How to set the current user

You can also catch the event "addedfile" when you declare your dropzone, this happens before sending anything.Example :

    url: your_posting_url,
    acceptedFiles: 'image/jpeg',
    addedfile:function (file) {
        if( your condition ){
            // okay !
        } else {
            // not okay !
    ... etc ...

vue-dropzone/ at master · rowanwins/vue , n\n /**\n * If `addRemoveLinks` is true, the text to be used for confirmation when cancelling upload.\n */\n dictCancelUploadConfirmation: \"Are you sure you want​  * If this is not null, then the user will be prompted before removing a file. */ dictRemoveFileConfirmation: null, /** * Displayed if `maxFiles` is st and exceeded. * The string `{{maxFiles}}` will be replaced by the configuration value. */ dictMaxFilesExceeded: "You can not upload any more files.", /** * Allows you to translate the different

How to Build a File Upload Form with Express and DropzoneJS , DropzoneJS allows users to upload files using drag and drop. it will take this from the form element if you use that approach, or else it'll maxFiles sets the maximum number of files a user can upload, if it's not set to null. dropzone.js DropzoneJS is an open source library that provides drag’n’drop file uploads with image previews. It’s lightweight, doesn’t depend on any other library (like jQuery) and is highly customizable.

dropzone.js in spip-zone/_plugins_/uploadhtml5/trunk/lib/dropzone , 22, * furnished to do so, subject to the following conditions: 23, * 224, * If not `​null` defines how many files this Dropzone handles. If it exceeds, 454, * If `​addRemoveLinks` is true, the text to be used for the cancel upload link. 455, */ Change it to fulfill your needs but make sure to properly 2224, file.xhr.abort();. 2225, }. Hi all, I was wondering what would be the best way to cancel a order confirmation print, if certain criteria is fulfilled. Inside the smartform for Order Confirmation certain criteria is defined, so that if they are fulfilled the print should be canc

How do you map over the values of Zip2? - Developer FAQ 3, If I do this: let foo = map(Zip2([1, 2, 3], ["a", "b", "c"]).generate()) { $0.0 } How to cancel/abort upload in Dropzone.js if condition is not fulfilled? Problem of mother tissue 9. Problems of hormones 10. Viral disease Criminal Abortion This means to take away the fetus before the development pregnancy by external influence. There are two stages at which abortion is done.. Early Abortion Late Abortion According to the medical science first type of abortion is not crucial.

  • Do you have a receiver function that is triggered after upload-completion of the file? If yes, you could check for file-emptiness in that function and perform the necessary action?
  • you could call .removeAllFiles().
  • @dreamwiever yep, I found this code, but I can't implement it into my. What's the trick?
  • what do you mean by can't?
  • this doesn't or cancel/abort like the question asks
  • While this doesn't exactly answer the question, it did have what I needed. Thanks!
  • I had to put this event listener inside the dropzone's "init" property and use this.on("addedfile") instead. For some reason referencing the dropzone after it was created and then listening for the addedfile event wasn't working.
  • In addition to this, I also had to add $('.dz-image-preview').remove() to remove the preview div from from the preview template after the test condition didn't pass.
  • If you get the error This file can't be queued because it has already been processed or was rejected. use the option enqueueForUpload: false and the function yourDropzone.processFile(file)