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@ifun-vue2/seamless-scroll

v1.2.2

Published

数据无缝滚动,数据量大时,开启虚拟滚动,提升页面性能.

Downloads

18

Readme

安装

npm i @ifun-vue2/seamless-scroll

使用

import IFunSeamlessScroll from "@ifun-vue2/seamless-scroll";
// 样式
import "@ifun-vue2/seamless-scroll/dist/style.css";
// 使用
Vue.use(IFunSeamlessScroll);

特点

  • 实现数据的无缝滚动(纵向)
  • 实现大数据量的虚拟无缝 滚动(大数据量优化)
  • 滚动内容自定义渲染
  • 滚动区域内,滚动可由鼠标控制滚动

基本使用,数据滚动

通过传入data, 数据类型为数组。

<template>
  <div style="margin-bottom:20px;height:300px;">
    <IFunSeamlessScroll :data="data" />
  </div>
</template>

<script>
export default {
  data() {
    return {
      data: [],
    };
  },
  mounted() {
    this.data = new Array(100).fill(0).map((item, index) => ({
      value: index,
      label: "数据" + index,
    }));
  },
};
</script>

自定义数据渲染 key

使用options 来定义数据下拉渲染定义的 value、label 值。还有pageSizeitemWidth

<template>
  <div style="margin-bottom:20px;">
    <IFunSeamlessScroll :data="data" :options="options" />
  </div>
</template>

<script>
export default {
  data() {
    return {
      data: [],
      options: {
        value: "id",
        label: "title",
      },
    };
  },
  mounted() {
    this.data = new Array(100).fill(0).map((item, index) => ({
      id: index,
      title: "数据" + index,
    }));
  },
};
</script>

开启虚拟滚动列表

通过传入virtual:true, 标识开启虚拟列表。还需要确认传入参数options.pageSize 默认100,也就是低于 100 会全部渲染。数据量不大开启虚拟滚动也没啥作用。性能比不上全部渲染滚动。

<template>
  <div style="margin-bottom:20px;height:300px;">
    <IFunSeamlessScroll :data="data" :virtual="true" :options="options" />
  </div>
</template>

<script>
export default {
  data() {
    return {
      data: [],
      options: {
        // 定义size
        pageSize: 20,
      },
    };
  },
  mounted() {
    this.data = new Array(100).fill(0).map((item, index) => ({
      value: index,
      label: "数据" + index,
    }));
  },
};
</script>

定义滚动速度

通过属性speed 定义滚动速度。数值越大就越快。默认1

<template>
  <div style="margin-bottom:20px;height:300px;">
    <IFunSeamlessScroll :data="data" :speed="2" />
  </div>
</template>

<script>
export default {
  data() {
    return {
      data: [],
    };
  },
  mounted() {
    this.data = new Array(100).fill(0).map((item, index) => ({
      value: index,
      label: "数据" + index,
    }));
  },
};
</script>

scroll关闭滚动

通过传入scroll:false, 标识不需要滚动。这种场景在于数据量少于滚动区域时,滚动反而没有任何意义。

此时可以通过定义 :scroll="data.length>5" 展示所有的数据。这完全取决于你的主观判断;

当然你也可以在数据量多是关闭自动滚动,此时你可以设置跟元素overflow:auto 手动滚动。

<template>
  <div style="margin-bottom:20px;height:300px;">
    <IFunSeamlessScroll
      :data="data"
      :scroll="data.length > 5"
      :options="options"
    />
  </div>
</template>

<script>
export default {
  data() {
    return {
      data: [],
      options: {
        // 定义size
        pageSize: 20,
      },
    };
  },
  mounted() {
    this.data = new Array(100).fill(0).map((item, index) => ({
      value: index,
      label: "数据" + index,
    }));
  },
};
</script>

slot

  • 提供两个 slot 定义内容区域。没有数据时,为空时,可通过empty slot 定义数据空展示状态。

  • 自定义元素渲染 slot 具名item。即可进行自定义数据渲染。

<template>
  <div style="margin-bottom:20px;height:300px;">
    <IFunSeamlessScroll
      :data="data"
      :scroll="data.length > 5"
      :options="options"
    >
      <template v-slot="{ params }">
        <div class="info">
          <span>{{ params.label }}</span>
          <span>{{ params.value }}</span>
        </div>
      </template>
    </IFunSeamlessScroll>
  </div>
</template>

<script>
export default {
  data() {
    return {
      data: [],
      options: {
        // 定义size
        pageSize: 20,
      },
    };
  },
  mounted() {
    this.data = new Array(100).fill(0).map((item, index) => ({
      value: index,
      label: "数据" + index,
    }));
  },
};
</script>

重要 为了最佳的滚动效果查看,请定义options.itemWidth ;

动态计算滚动高度,这样可以无差别切换渲染。默认itemWidth:30 如果各个元素高度不一,则滚动效果不好。

鼠标滚动控制内容滚动

滚动内容区放开了鼠标滚动;可对当前内容实现鼠标的滚轮滚动;

不开启虚拟滚动时,没有任何问题;

开启虚拟滚动,当向上滚动时,分批次数据仅滚动到内容区顶部,不会在进行循环渲染;向下滚动则没有问题;

API 属性一览

| props | 说明 | 默认值 | | ----------- | -------------------- | ---------------- | | virtual | 是否开启虚拟滚动 | 默认 false | | data | 数据源 | 必传,Array | | speed | 滚动速度 | 默认 1 | | options | 滚动配置 | 详见下表 Options | | scroll | 控制是否需要自动滚动 | 默认 true | | whellScroll | 鼠标滚轮支持滚动 | 默认 true |

ScrollOptions

| props | 说明 | 默认值 | | --------- | :----------------: | ----------------------------------------------------------- | | value | 数据 key 值 | 默认 value | | label | 数据展示的名称 | 默认 label | | pageSize | 列表渲染的数据量 | 默认 100 | | itemWidth | 渲染的数据元素高度 | 竖向滚动为高度,横向滚动为宽度(暂时没有横向滚动),默认 30 |