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docs: image-viewer component support named slot viewer (#3357 )

2021-09-12 17:51:13 +08:00

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Image 图片

图片容器，在保留原生 img 的特性下，支持懒加载，自定义占位、加载失败等

基础用法

:::demo 可通过fit确定图片如何适应到容器框，同原生 object-fit。

<div class="demo-image">
  <div class="block" v-for="fit in fits" :key="fit">
    <span class="demonstration">{{ fit }}</span>
    <el-image
      style="width: 100px; height: 100px"
      :src="url"
      :fit="fit"
    ></el-image>
  </div>
</div>

<script>
  export default {
    data() {
      return {
        fits: ['fill', 'contain', 'cover', 'none', 'scale-down'],
        url: 'https://fuss10.elemecdn.com/e/5d/4a731a90594a4af544c0c25941171jpeg.jpeg',
      }
    },
  }
</script>
<!--
<setup>

  import { defineComponent, reactive, toRefs } from 'vue';

  export default defineComponent({
    setup() {
      const state = reactive({
        fits: ['fill', 'contain', 'cover', 'none', 'scale-down'],
        url: 'https://fuss10.elemecdn.com/e/5d/4a731a90594a4af544c0c25941171jpeg.jpeg'
      });

      return {
        ...toRefs(state),
      };
    },
  });
</setup>
-->

:::

占位内容

:::demo 可通过slot = placeholder可自定义占位内容

<div class="demo-image__placeholder">
  <div class="block">
    <span class="demonstration">默认</span>
    <el-image :src="src"></el-image>
  </div>
  <div class="block">
    <span class="demonstration">自定义</span>
    <el-image :src="src">
      <template #placeholder>
        <div class="image-slot">加载中<span class="dot">...</span></div>
      </template>
    </el-image>
  </div>
</div>

<script>
  export default {
    data() {
      return {
        src: 'https://cube.elemecdn.com/6/94/4d3ea53c084bad6931a56d5158a48jpeg.jpeg',
      }
    },
  }
</script>
<!--
<setup>

  import { defineComponent, ref } from 'vue';

  export default defineComponent({
    setup() {
      const src = ref('https://cube.elemecdn.com/6/94/4d3ea53c084bad6931a56d5158a48jpeg.jpeg');

      return {
        src,
      };
    },
  });

</setup>
-->

:::

加载失败

:::demo 可通过slot = error可自定义加载失败内容

<div class="demo-image__error">
  <div class="block">
    <span class="demonstration">默认</span>
    <el-image></el-image>
  </div>
  <div class="block">
    <span class="demonstration">自定义</span>
    <el-image>
      <template #error>
        <div class="image-slot">
          <i class="el-icon-picture-outline"></i>
        </div>
      </template>
    </el-image>
  </div>
</div>

:::

懒加载

:::demo 可通过lazy开启懒加载功能，当图片滚动到可视范围内才会加载。可通过scroll-container来设置滚动容器，若未定义，则为最近一个overflow值为auto或scroll的父元素。

<div class="demo-image__lazy">
  <el-image v-for="url in urls" :key="url" :src="url" lazy></el-image>
</div>

<script>
  export default {
    data() {
      return {
        urls: [
          '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>
<!--
<setup>
  import { defineComponent, ref } from 'vue';

  export default defineComponent({
    setup() {
      const urls = 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',
      ]);

      return {
        urls,
      };
    },
  });

</setup>
-->

:::

大图预览

:::demo 可通过 previewSrcList 开启预览大图的功能。

<div class="demo-image__preview">
  <el-image
    style="width: 100px; height: 100px"
    :src="url"
    :preview-src-list="srcList"
  >
  </el-image>
</div>

<script>
  export default {
    data() {
      return {
        url: 'https://fuss10.elemecdn.com/e/5d/4a731a90594a4af544c0c25941171jpeg.jpeg',
        srcList: [
          'https://fuss10.elemecdn.com/8/27/f01c15bb73e1ef3793e64e6b7bbccjpeg.jpeg',
          'https://fuss10.elemecdn.com/1/8e/aeffeb4de74e2fde4bd74fc7b4486jpeg.jpeg',
        ],
      }
    },
  }
</script>
<!--
<setup>

  import { defineComponent, ref } from 'vue';

  export default defineComponent({
    setup() {
      const url = ref('https://fuss10.elemecdn.com/e/5d/4a731a90594a4af544c0c25941171jpeg.jpeg');
      const srcList = ref([
        'https://fuss10.elemecdn.com/8/27/f01c15bb73e1ef3793e64e6b7bbccjpeg.jpeg',
        'https://fuss10.elemecdn.com/1/8e/aeffeb4de74e2fde4bd74fc7b4486jpeg.jpeg',
      ]);

      return {
        url,
        srcList,
      };
    },
  });

</setup>
-->

:::

Image Attributes

参数	说明	类型	可选值	默认值
alt	原生 alt	string	-	-
fit	确定图片如何适应容器框，同原生 object-fit	string	fill / contain / cover / none / scale-down	-
hide-on-click-modal	当开启 preview 功能时，是否可以通过点击遮罩层关闭 preview	boolean	true / false	false
lazy	是否开启懒加载	boolean	—	false
preview-src-list	开启图片预览功能	Array	—	-
referrer-policy	原生 referrerPolicy	string	-	-
src	图片源，同原生	string	—	-
scroll-container	开启懒加载后，监听 scroll 事件的容器	string / HTMLElement	—	最近一个 overflow 值为 auto 或 scroll 的父元素
z-index	设置图片预览的 z-index	Number	—	2000
append-to-body	image 自身是否插入至 body 元素上。嵌套的父元素设置了 transform 属性必须指定该属性并赋值为 true	boolean	—	false

Image Events

事件名称	说明	回调参数
load	图片加载成功触发	(e: Event)
error	图片加载失败触发	(e: Error)

Image Slots

名称	说明
placeholder	图片未加载的占位内容
error	加载失败的内容

ImageViewer Attributes

参数	说明	类型	可选值	默认值
url-list	用于预览的图片链接列表	Array<string>	-	[]
z-index	预览时遮罩层的 z-index	number / string	int / string<int>	2000
initial-index	预览的首张图片的位置, 小于等于数组长度	number	int	0
infinite	是否可以无限循环预览	boolean	true / false	true
hide-on-click-modal	是否可以通过点击遮罩层关闭预览	boolean	true / false	false

ImageViewer Events

事件名称	说明	回调参数
close	当点击 X 按钮或者在 hide-on-click-modal 为 true 时点击遮罩层时触发	无
switch	当图片切换时触发	(val: number) 切换目标的下标

ImageViewer Slots

名称	说明
viewer	预览区域的内容

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