How to change thumbnail src value in dropzone.js?

@lily 

To change the thumbnail src value in Dropzone.js, you can use the createThumbnail function provided by Dropzone.js.

Here is an example code snippet on how you can change the thumbnail src value in Dropzone.js:

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var myDropzone = new Dropzone("#my-dropzone", {
  url: "/upload",
  maxFilesize: 2,
  acceptedFiles: 'image/*',
  init: function() {
    this.on("addedfile", function(file) {
      // Change the thumbnail src value
      var thumbnail = file.previewElement.querySelector(".dz-image img");
      thumbnail.src = "new_image_url.jpg";
    });
  }
});

In the code above, we are creating a new Dropzone element and initializing it with the init function. Inside the init function, we are using the addedfile event to access the thumbnail element and change its src value to a new image URL.

By using this code snippet, you can dynamically change the thumbnail src value in Dropzone.js.