如何在vuejs中上传图片？

Question

请在下面是我的vue组件的脚本部分中的代码.

我正在获取所有输入字段,但图像和视频上传显示空值.

我试图解决这个问题,但无济于事.

        playVideo(url) {
            let video = $('#video-preview').get(0);
            video.preload = 'metadata';
            // Load video in Safari / IE11
            if (url) {
                video.muted = false;
                video.playsInline = true;
                video.play();
            }
        },

        // Read a file input as a data URL.
        readDataUrl(input, callback) {
            if (input.files && input.files[0]) {
                let fileReader = new FileReader();
                fileReader.onload = function () {
                    callback(fileReader.result);
                };
                fileReader.readAsDataURL(input.files[0]);
            }
            else {
                callback(null);
            }
        },

        // Read a file input as an object url.
        readObjectUrl(input, callback) {
            if (input.files && input.files[0]) {
                let fileReader = new FileReader();
                fileReader.onload = function () {
                    let blob = new Blob([fileReader.result], {type: input.files[0].type});
                    let url = URL.createObjectURL(blob);
                    callback(url, blob);
                };
                fileReader.readAsArrayBuffer(input.files[0]);
            }
            else {
                callback(null);
            }

        },

    }

}

我想要实现的是上传图像和视频文件,在保存为blob之前预览它们.

上图显示了我的回复@samayo

图像和视频blob显示空值.

Answer 1

如果您想上传图像并在提交之前预览它，您可以选择使用简单且实用的方式。

<template>
  <input type="file" accept="image/*" @change="onChange" />
  <div id="preview">
    <img v-if="item.imageUrl" :src="item.imageUrl" />
  </div>
</template>


<script>
export default {
  name: 'imageUpload',
  data() {
    return {
      item:{
          //...
          image : null,
          imageUrl: null
      }
    }
  },
  methods: {
    onChange(e) {
      const file = e.target.files[0]
      this.image = file
      this.item.imageUrl = URL.createObjectURL(file)
    }
  }
} 
</script>

Answer 2

如果您使用axios或fetch上传vue文件非常简单.

这是我当前项目的副本/面食.我用axios上传图片:

首先,您需要让您的输入看起来像这样:

<input type="file" accept="image/*" @change="uploadImage($event)" id="file-input">

然后添加如下方法:

methods: {

  uploadImage(event) {

    const URL = 'http://foobar.com/upload'; 

    let data = new FormData();
    data.append('name', 'my-picture');
    data.append('file', event.target.files[0]); 

    let config = {
      header : {
        'Content-Type' : 'image/png'
      }
    }

    axios.put(
      URL, 
      data,
      config
    ).then(
      response => {
        console.log('image upload response > ', response)
      }
    )
  }
}

Answer 3

I think in your case you are looking for a solution like this

example: uploading a image and previewing it before submission

<template>
   <div>
      <img src:"previewImage" class="uploading-image" />
      <input type="file" accept="image/jpeg" @change=uploadImage>
   </div>
</template>

<script>
    export default {
        name:'imageUpload',
        data(){
            return{
               previewImage:null
            }
        },
        methods:{
            uploadImage(e){
                const image = e.target.files[0];
                const reader = new FileReader();
                reader.readAsDataURL(image);
                reader.onload = e =>{
                    this.previewImage = e.target.result;
                    console.log(this.previewImage);
                };
            }
        }
     }  // missing closure added
</script>



<style>
   .uploading-image{
     display:flex;
   }
 </style>

Answer 4

我是根据其他几个人的回答来总结一下的。

this.image已进行 base64 编码并准备发送到您的 API。

<template>
    <v-file-input
       v-model="file"
       chips
       accept="image/*"
       label="Image"
       @change="onFileChange"
    />
</template>

<script>
export default {
    data: { file: null, image: null },
    methods: {
        onFileChange() {
            const reader = new FileReader()
            reader.readAsDataURL(this.file)
            reader.onload = e => {
                this.image = e.target.result
                console.log(this.image)
            }
        },
    },
}
</script>