Validate image on drop in Vue Uploader component

11 Jun 20246 minutes to read

The uploader component allows you to upload all type of images by setting image/* to allowedExtensions property or directly you can set it to accept attribute of uploader element.

By default, the behavior is working with select a file using browse button. But, this behavior doesn’t support on drag and drop the files. You can handle this behavior manually using selected event by filtering the file types from application.

In the following example, validated image files using images/*. You are able to drag and drop the image files with extension of png, jpg, bpg, gif and tiff to upload it.

Composition API (~/src/App.vue)
Options API (~/src/App.vue)
<template>
  <div>
    <ejs-uploader ref="uploadObj" id='defaultfileupload' :selected="onSelect" name="UploadFiles" :autoUpload="autoUpload"
      :asyncSettings="path" :allowedExtensions="extensions"></ejs-uploader>
  </div>
</template>
<script setup>

import { UploaderComponent as EjsUploader } from '@syncfusion/ej2-vue-inputs';

const path = {
  saveUrl: 'https://services.syncfusion.com/vue/production/api/FileUploader/Save',
  removeUrl: 'https://services.syncfusion.com/vue/production/api/FileUploader/Remove'
};
const autoUpload = false;
const extensions = 'image/*';

const onSelect = (args) => {
  if (args.event.type === 'drop') {
    let allImages = ['png', 'jpg', 'jpeg', 'gif', 'tiff', 'bpg'];
    let files = args.filesData;
    let modifiedFiles = [];
    for (let file of files) {
      if (allImages.indexOf(file.type) === -1) {
        file.status = 'File type is not allowed';
        file.statusCode = '0';
      }
      modifiedFiles.push(file);
    }
    args.isModified = true;
  }
};

</script>
<style>
@import "../node_modules/@syncfusion/ej2-base/styles/material.css";
@import "../node_modules/@syncfusion/ej2-buttons/styles/material.css";
@import "../node_modules/@syncfusion/ej2-vue-inputs/styles/material.css";

#container {
  visibility: hidden;
  padding-left: 5%;
  width: 100%;
}

#loader {
  color: #008cff;
  font-family: 'Helvetica Neue', 'calibiri';
  font-size: 14px;
  height: 40px;
  left: 45%;
  position: absolute;
  top: 45%;
  width: 30%;
}
</style>
<template>
  <div>
    <ejs-uploader ref="uploadObj" id='defaultfileupload' :selected="onSelect" name="UploadFiles" :autoUpload="autoUpload"
      :asyncSettings="path" :allowedExtensions="extensions"></ejs-uploader>
  </div>
</template>
<script>

import { UploaderComponent } from '@syncfusion/ej2-vue-inputs';

export default {
  name: "App",
  components: {
    "ejs-uploader": UploaderComponent
  },
  data: function () {
    return {
      path: {
        saveUrl: 'https://services.syncfusion.com/vue/production/api/FileUploader/Save',
        removeUrl: 'https://services.syncfusion.com/vue/production/api/FileUploader/Remove'
      },
      autoUpload: false,
      extensions: 'image/*'
    }
  },
  methods: {
    onSelect: function (args) {
      if (args.event.type === 'drop') {
        let allImages = ['png', 'jpg', 'jpeg', 'gif', 'tiff', 'bpg'];
        let files = args.filesData;
        let modifiedFiles = [];
        for (let file of files) {
          if (allImages.indexOf(file.type) === -1) {
            file.status = 'File type is not allowed';
            file.statusCode = '0';
          }
          modifiedFiles.push(file);
        }
        args.isModified = true;
      }
    }
  }
}
</script>
<style>
@import "../node_modules/@syncfusion/ej2-base/styles/material.css";
@import "../node_modules/@syncfusion/ej2-buttons/styles/material.css";
@import "../node_modules/@syncfusion/ej2-vue-inputs/styles/material.css";

#container {
  visibility: hidden;
  padding-left: 5%;
  width: 100%;
}

#loader {
  color: #008cff;
  font-family: 'Helvetica Neue', 'calibiri';
  font-size: 14px;
  height: 40px;
  left: 45%;
  position: absolute;
  top: 45%;
  width: 30%;
}
</style>

You can also explore Vue File Upload feature tour page for its groundbreaking features. You can also explore our Vue File Upload example to understand how to browse the files which you want to upload to the server.