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Vue.js で画像(ファイル)アップロード直後に表示させる方法

Posted at

バージョン

Vue.js: 2.4.3

サンプル

https://jsfiddle.net/vtexxmh1/1/
vue_upload.gif

方法

v-on でチェンジイベントを取る

.html
<div id="app">
  <h2>↓画像↓</h2>
  <img v-show="uploadedImage" :src="uploadedImage" />
  <input type="file" v-on:change="onFileChange">
</div>

取得したファイルをバインドする

.js
new Vue({
  el: '#app',
  data() {
    return {
      uploadedImage: '',
    };
  },
  methods: {
    onFileChange(e) {
      let files = e.target.files || e.dataTransfer.files;
      this.createImage(files[0]);
    },
    // アップロードした画像を表示
    createImage(file) {
      let reader = new FileReader();
      reader.onload = (e) => {
        this.uploadedImage = e.target.result;
      };
      reader.readAsDataURL(file);
    },
  },  
})
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