Let's talk about three methods of uploading Vue images

With the development of the Internet, image uploading has become an important function in daily development. In Vue development, we also have many ways to implement image upload, such as using third-party plug-ins, native Ajax, and using HTML5's FileReader. This article will introduce these three ways to upload images and their respective advantages and disadvantages. I hope it will be helpful to you.

1. Use third-party plug-ins

In Vue development, we can use some widely used third-party plug-ins to upload images, such as Vue-Upload, Vue-Core-Image -Upload and so on. These plug-ins have been used and tested by many people, can effectively speed up our development process, and they can be quickly integrated into our projects. Here we take Vue-Upload as an example to explain how to use it.

The first step is to install the plug-in, enter in the command line:

npm install vue-upload

The second step is to introduce the plug-in, introduce Vue-Upload into the components that need to be used:

import VueUpload from 'vue-upload'

The third step is to use it in the component. We use a button as a trigger to select the image, and then use the Vue-Upload function to upload the image:

<button @click="upload()">选择文件</button>
<VueUpload ref="upload"
           :post-action="&#39;url&#39;"
           :headers="headers"
           :name="&#39;file&#39;"
           @input="onUpload"></VueUpload>

Among them, post-action is the upload address, headers is the request header, name is the file field name. The onUpload method is the method called after the upload is completed.

The advantage of Vue-Upload is that it is fast and convenient, but the disadvantage is also obvious, that is, we cannot fully customize the upload function.

2. Native Ajax

Vue also supports native Ajax requests to complete image uploads. We can implement an input input box in the component, and then use Ajax to upload the file selected in the input to the server. This method requires us to implement the complete upload process ourselves, including upload progress, exception handling, etc., but we can freely customize the upload function and will not be restricted by third-party plug-ins.

The first step is to add an input input box to the template:

<input ref="file" type="file" @change="upload()">

The second step is to implement the upload logic in Vue's methods:

upload: function () {
  const fileInput = this.$refs.file;
  const file = fileInput.files[0]
  const formData = new FormData();
  formData.append('file', file);

  axios.post('/upload', formData, {
    headers: {
      'Content-Type': 'multipart/form-data'
    },
    onUploadProgress: e => {
      // 上传进度的处理逻辑
    }
  }).then(res => {
    // 上传成功的处理逻辑
  }).catch(err => {
    // 异常处理逻辑
  })
}

This code Axios is used to send Ajax requests, and we can choose other network request libraries. onUploadProcess is the callback function of upload progress, in which we can implement the processing logic of upload progress.

3. Using HTML5’s FileReader

HTML5’s FileReader provides a new way to read files on the user’s local device, and we can use it to complete image uploads. This method can avoid the browser's default submission and page jump, and is more friendly to combine with Vue's component development method.

The first step is to define an image variable and a fileReader object in the component's data:

data: function () {
  const fileReader = new FileReader();
  fileReader.onload = () => {
    this.image = fileReader.result;
  };
  
  return {
    image: null,
    fileReader: fileReader
  };
}

The second step is to implement the file reading and uploading logic in the component's methods:

upload: function () {
  const fileInput = this.$refs.file;
  const file = fileInput.files[0]
  this.fileReader.readAsDataURL(file);
},
submit: function () {
  const image = this.image;
  axios.post('/upload', {image: image})
    .then(res => {
      // 上传成功的处理逻辑
    }).catch(err => {
      // 异常处理逻辑
    })
}

Here we read the image and store it in an image variable, and then submit the image to the server. The advantage of this method is that it has a friendly interface and clear image processing logic. The disadvantage is that it cannot support the display of upload progress.

Summary

This article introduces three methods to implement image upload in Vue, which are using third-party plug-ins, native Ajax and using HTML5's FileReader. Each method has its advantages and disadvantages, and developers can choose the appropriate method based on the actual needs of the project. Image uploading is a common function, and mastering these uploading methods is also one of the essential skills for Vue developers.

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