element-plus picture preview

Background: The image needs to be zoomed in and previewed in the project;

solution:

① Use the preview function that comes with el-image;

② Use the el-image-preview component to preview;

1. Use el-image to preview:

Official Documentation: Image Image | Element Plus

1. Official example:

<template>
  <div class="demo-image__preview">
    <el-image
      style="width: 100px; height: 100px"
      :src="url" 
      :zoom-rate="1.2"
      :preview-src-list="srcList" //需要预览的图片列表
      :initial-index="4" //从哪一张图片开始预览
      fit="cover" //相当于 object-fit:cover
    />
  </div>
</template>

<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>

2. Apply to the project (full code):

<template>
  <div>
    <el-table :data="initUserFileList" style="width: 100%" table-layout="auto">
        <el-table-column prop="originalImg" label="Original Image" width="180">
            <template #default="scope">
              <div class="maskContainer previewBox">
                <div class="demo-image__preview">
                  <el-image
                    :src="scope.row.originalImg"
                    :zoom-rate="1.2"
                    :preview-src-list="[scope.row.originalImg]" //如果希望可以左右切换图片，此处可以换成数组 ['imageUrl','imageUrl','imageUrl',...]
                    :initial-index="4"
                    class="originalImg"
                    hide-on-click-modal
                  />
                </div>
              </div>
            </template>
          </el-table-column>
      </el-table>
   </div>
</template>

<script setup>
import {ref, onMounted} from 'vue'

const initUserFileList = ref([]);
const getInitUserFileList = async () => {
    let res = await getUserFileList(); //此处的 getUserFileList 为获取图片列表的方法
    if (res.code === 1) {
        initUserFileList.value = res.data.paginate;
    } else {
        ElMessage.warning(res.msg)
        return false;
    }
}

onMounted(() => { 
    getInitUserFileList();    
});
</script>

3. Rough renderings:

2. Use el-image-preview to preview:

1. The el-image-preview component uses:

//showViewer 来控制预览组件的显示和隐藏
//previewList 为预览的图片列表

<div class="demo-image__preview">
    <el-image-viewer hide-on-click-modal @close="()=>{showViewer = false}" v-if="showViewer" :url-list="previewList" />
</div>

2. Example of use:

<template>
    <div>
        <el-image
                :src="url"
                :zoom-rate="1.2"
                :initial-index="4"
                class="originalImg"
                @click="()=>{showViewer = true}"
        />
        <div class="demo-image__preview">
            <el-image-viewer hide-on-click-modal @close="()=>{showViewer = false}" v-if="showViewer" :url-list="previewList" />
        </div>
    </div>
</template>


<script setup>
import {ref} from 'vue'

const url = ref('https://fuss10.elemecdn.com/a/3f/3302e58f9a181d2509f3dc0fa68b0jpeg.jpeg');
const previewList = ref([
    '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',
]);

const showViewer = ref(false);
</script>

3. Effect picture:

 

3. Extended functions (add a mask to the picture, set the button on the mask and click to enlarge):

1. Expected effect:

 2. Use the built-in preview function of el-image:

Disadvantage: If the table is dynamically updated in real time, there will be misalignment when clicking on the image preview

<template>
    <div>
        <el-table ref="imgTableRef" :header-cell-style="{'text-align':'center'}" :data="previewList" style="width: 100%">
            <el-table-column prop="imagePath" label="Original Image" width="200">
                <template #default="scope">
                    <div class="maskContainer previewBox">
                        <div class="demo-image__preview">
                            <el-image :src="scope.row"
                                      :zoom-rate="1.2"
                                      :preview-src-list="[scope.row]"
                                      :initial-index="4"
                                      class="originalImg"
                                      hide-on-click-modal
                            />
                        </div>
                        <div class="mask">
                            <div class="downloadImg svgBox">
                                <download/>
                            </div>
                            <div class="zoomInImg svgBox" @click="showImgView('originalImg', scope.$index)">
                                <zoom-in/>
                            </div>
                        </div>
                    </div>
                </template>
            </el-table-column>
        </el-table>
    </div>
</template>

<script setup>
import {ref} from 'vue'

const previewList = ref([
    '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',
]);

const showImgView = (domClass, index) => {
    console.log(index)
    let dom = document.getElementsByClassName(domClass);
    dom[index].firstChild.click(); //调用 el-image 的预览方法
}
</script>

<style lang="scss" scoped>
.maskContainer {
  position: relative;
  line-height: 0;

  &:hover {
    .mask {
      opacity: 1;
    }

    img {
      transform: scale(1.1);
    }
  }

  .mask {
    transition: all 0.5s;
    opacity: 0;
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: rgba($color: #000000, $alpha: 0.3);
    display: flex;
    align-items: center;
    justify-content: center;

    .svgBox {
      height: 50px;
      width: 50px;
      background: rgb(#000, 0.3);
      border-radius: 50%;
      margin: 10px;
      padding: 10px;
      cursor: pointer;
    }

    svg {
      color: #fff;
      width: 30px;
      height: 30px;
    }
  }
}
</style>

3. Use el-image-preview to preview:

Applicable to non-dynamically updated tables and dynamically updated tables;

<template>
    <div>
        <div class="demo-image__preview">
            <el-image-viewer hide-on-click-modal @close="()=>{showViewer = false}" v-if="showViewer" :url-list="previewList" />
        </div>
        <el-table ref="imgTableRef" :header-cell-style="{'text-align':'center'}" :data="initFileList" style="width: 100%">
            <el-table-column prop="imagePath" label="Original Image" width="200">
                <template #default="scope">
                    <div class="maskContainer previewBox">
                        <div class="demo-image__preview">
                            <el-image :src="scope.row" class="originalImg" lazy>
                                <template #error>
                                    <div class="image-slot el-image__error">
                                        <el-icon :size="30"><PictureFilled /></el-icon>
                                    </div>
                                </template>
                            </el-image>
                        </div>
                        <div class="mask">
                            <div class="downloadImg svgBox">
                                <download/>
                            </div>
                            <div class="zoomInImg svgBox" @click="showImgView(scope.row)">
                                <zoom-in/>
                            </div>
                        </div>
                    </div>
                </template>
            </el-table-column>
        </el-table>
    </div>
</template>

<script setup>
import {ref} from 'vue'

const initFileList = ref([
    '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',
]);

const showViewer = ref(false);
const previewList = ref([]);
const showImgView = (src) => {
    showViewer.value = true;
    previewList.value = [src]
};
</script>

<style lang="scss" scoped>
.maskContainer {
  position: relative;
  line-height: 0;

  &:hover {
    .mask {
      opacity: 1;
    }

    img {
      transform: scale(1.1);
    }
  }

  .mask {
    transition: all 0.5s;
    opacity: 0;
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: rgba($color: #000000, $alpha: 0.3);
    display: flex;
    align-items: center;
    justify-content: center;

    .svgBox {
      height: 50px;
      width: 50px;
      background: rgb(#000, 0.3);
      border-radius: 50%;
      margin: 10px;
      padding: 10px;
      cursor: pointer;
    }

    svg {
      color: #fff;
      width: 30px;
      height: 30px;
    }
  }
}
</style>