assigning a value to a Vue variable inside a JavaScript function when using Dropzone

Currently, I am working on a Laravel page that utilizes Vue for the overall functionality and axios post for form submission. However, I've encountered a complex situation.

Within my page, there is a standard dropzone (using plain JS dropzone code) where I upload images. As I drop an image, the console successfully logs the file name. The challenge arises when I try to transfer that filename into a variable or object in my Vue code.

The dropzone code looks like this:

Dropzone.options.imageWithZones = {
        init: function() {
            this.on("addedfile", 
                function(file) { 
                    console.log(file.name);
            });
        }           
    };

Here is the relevant part of my Vue code, where I need to assign the file name to ImageZoneName:

new Vue({
      components: {
        Multiselect: window.VueMultiselect.default
      },
      el: "#commonDiv",
      data() {
        return{
            ImageZoneName: [],
            
        }

      },
........

I am seeking advice on the most straightforward approach to capture the file name when it's added to the dropzone and set the value of vue's ImageZoneName object with that filename.

Answer №1

There are two methods to achieve this:

  1. One approach is to move the dropzone event configuration inside the Vue mounted lifecycle method, allowing easy access to the Vue instance for setting variables.

new Vue({
  el: "#app",
  data: {
    imageZoneNames: [],
  },
  mounted() {
    const vm = this;
    Dropzone.options.imageWithZones = {
        init: function() {
          this.on("addedfile", 
            function(file) { 
              vm.imageZoneNames.push(file.name);
            }
          );
        }           
      };
  } // end mounted
})
<link href="https://cdnjs.cloudflare.com/ajax/libs/dropzone/5.7.1/dropzone.min.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/dropzone/5.7.1/dropzone.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.min.js"></script>
<div id="app">
  Files:
  <ul>
    <li v-for="fileName in imageZoneNames" :key="fileName">
      {{ fileName }}
    </li>
  </ul>
  <form action="/file-upload"
      class="dropzone"
      id="imageWithZones"></form>
</div>

  1. The other way is to assign the Vue instance to a variable and then access the data directly through that variable.

const vm = new Vue({
  el: "#app",
  data: {
    imageZoneNames: [],
  },
})

Dropzone.options.imageWithZones = {
  init: function() {
    this.on("addedfile", 
      function(file) { 
        vm.imageZoneNames.push(file.name)
      }
      );
  }           
};
<script src="https://cdnjs.cloudflare.com/ajax/libs/dropzone/5.7.1/dropzone.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/dropzone/5.7.1/dropzone.min.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.min.js"></script>
<div id="app">
  Files:
  <ul>
    <li v-for="fileName in imageZoneNames" :key="fileName">
      {{ fileName }}
    </li>
  </ul>
  <form action="/file-upload"
      class="dropzone"
      id="imageWithZones"></form>
</div>

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