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vue前端图片上传、回显图片

方法一(基于vue+html):

<label>文件:</label>
<input type="file" @change="selectFile($event)"/>
<button type="button" @click="upfile($event)">上传</button>
<div>
    <img :src="'upfiles/'+filename" />
</div>
<script src="js/axios.min.js"></script>
    <script src="js/vue.js"></script>
    <script>
        const vm = new Vue({
            el:"#app",
            data:{
                file:null,
                filename:"shangchuang.png"
            },
            methods: {
                selectFile(event){
                    console.log(event);
                    this.file = event.target.files[0];
                },
                upfile(event){
                    let formdata = new FormData();
                    formdata.append("file",this.file);
                    axios.post("http://localhost:8080/upfile/photo",formdata,{
                        "Content-type":"multipart/form-data"
                    }).then((res)=>{
                        console.log(res.data);
                        this.filename = res.data;
                    });
                }
            },
        })
    </script>

方法二(基于vue+element):

<template v-slot="scope">
    <el-image :src="getAssetsFile(scope.row.reason)"></el-image>
</template>
<el-form-item label="图片" prop="reason">
    <el-upload
       :action="imgUrl"
       :class="{ disabled: uploadDisabled }"
       list-type="picture-card"
       :limit="limitcount"
       :on-change="handleChange"
       :on-remove="handleRemove"
       :show-file-list="true"
       :on-success="onSuccess"
       style="width: 200px;margin-left: 54px">
    </el-upload>
    <el-dialog :visible.sync="dialogVisible">
       <img v-if="dialogImageUrl" width="100%" :src="dialogImageUrl" alt="">
       <el-icon v-else class="avatar-uploader-icon"><plus /></el-icon>
    </el-dialog>
</el-form-item>
return{
    imgUrl:'http://localhost:8080/mainupfile/photo',//文件上传访问后端的路径
    dialogImageUrl: null,
    dialogVisible: false,
    uploadDisabled: false,
    limitcount: 1,
}

methods:{
    /** 回显图片 */
    getAssetsFile(url){
      return new URL(`../../assets/upload/${url}`, import.meta.url).href
    },
    /**选择图片*/
    handleChange(file, fileList) {
      this.uploadDisabled = fileList.length >= this.limitcount;
      console.log("this.uploadDisabled", this.uploadDisabled);
      return false;
    },
    /**删除图片*/
    handleRemove(file, fileList) {
      this.uploadDisabled = fileList.length >= this.limitcount;
      console.log("this.uploadDisabled", this.uploadDisabled);
    },
    /**成功获取图片*/
    onSuccess: function (response) {

      // this.imgUrl= this.FormList;
      this.dialogImageUrl = response;
      //
      this.FormList.reason = response
    },
}

方法三(基于vue+vant):

<img :src="'src/assets/upload/'+photo">
<van-uploader name="file" :after-read="afterRead">
    <p>从相册中选择</p>
</van-uploader>
const afterRead = async (file) => {
    const modifiedFile = new File([file.file], '.png'); // 修改文件名为 new_filename.jpg
  try {
    const formData = new FormData();
    formData.append('file', modifiedFile);

    const response = await axios.post('http://localhost:8080/upphoto/fileUpload', formData, {
      headers: {
        'Content-Type': 'multipart/form-data',
      },
    });

    console.log("图片为:"+response.data);
    showToast({
      type: 'success',
      message: '头像上传成功',
    });
    photo.value = response.data;
    console.log("photo:"+photo.value);
    console.log("response.data:"+response.data);
  } catch (error) {
    console.error('头像上传失败:', error);
    showToast({
      type: 'fail',
      message: '头像上传失败',
    });
  }
};

图片预览效果的实现:

Element Plus官网实现:

<el-image
      style="width: 100px; height: 100px"
      :src="url"
      :zoom-rate="1.2"
      :max-scale="7"
      :min-scale="0.2"
      :preview-src-list="srcList"
      :initial-index="4"
      fit="cover"
    />
</div>

<script lang="ts" setup>
const url =
  'https://fuss10.elemecdn.com/a/3f/3302e58f9a181d2509f3dc0fa68b0jpeg.jpeg'
const srcList = [
  'https://fuss10.elemecdn.com/a/3f/3302e58f9a181d2509f3dc0fa68b0jpeg.jpeg',
  'https://fuss10.elemecdn.com/1/34/19aa98b1fcb2781c4fba33d850549jpeg.jpeg',
  'https://fuss10.elemecdn.com/0/6f/e35ff375812e6b0020b6b4e8f9583jpeg.jpeg',
  'https://fuss10.elemecdn.com/9/bb/e27858e973f5d7d3904835f46abbdjpeg.jpeg',
  'https://fuss10.elemecdn.com/d/e6/c4d93a3805b3ce3f323f7974e6f78jpeg.jpeg',
  'https://fuss10.elemecdn.com/3/28/bbf893f792f03a54408b3b7a7ebf0jpeg.jpeg',
  'https://fuss10.elemecdn.com/2/11/6535bcfb26e4c79b48ddde44f4b6fjpeg.jpeg',
]
</script>

<style scoped>
.demo-image__error .image-slot {
  font-size: 30px;
}
.demo-image__error .image-slot .el-icon {
  font-size: 30px;
}
.demo-image__error .el-image {
  width: 100%;
  height: 200px;
}
</style>

如果不想用官网的方法,就自己定义事件:

<template v-slot="scope">
    <el-image :src="getAssetsFile(scope.row.cardphoto)" 
fit="cover" 
style="width: 50px; height: 50px"  class="building-image" @click="openPreview(scope.row.cardphoto)"></el-image>
</template>
//弹出图片层
<el-dialog v-model="previewDialogVisible" width="30%">
     <div style="display: flex;justify-content: center;align-items: center;width: 100%;height: 100%;">
             <el-image :src="previewImageUrl" fit="contain" 
style="width: 100%; height: 100%"></el-image>
     </div>
</el-dialog>

//逻辑,我这里是使用了ts语法setup
const previewDialogVisible = ref(false);
const previewImageUrl = ref('');

const getAssetsFile=(url: string)=>{
    return new URL(`../assets/upload/${url}`, import.meta.url).href;
    // return "../assets/upload/"+ url
}

const openPreview = (url: string) => {
  previewImageUrl.value = getAssetsFile(url);
  previewDialogVisible.value = true;
};
标签: 前端 vue elementui

本文转载自: https://blog.csdn.net/fugaoliang/article/details/134636057
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