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114 lines
2.6 KiB
Markdown
114 lines
2.6 KiB
Markdown
## Waterfall 瀑布流
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### 使用指南
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#### 全局注册
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`Waterfall`引入后就自动全局安装。如果需要，可以再次手动安装：
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```js
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import Vue from 'vue';
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import { Waterfall } from 'vant';
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Waterfall.install(Vue);
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```
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#### 局部注册
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如果你只是想在某个组件中使用`Waterfall`，可以在对应组件中注册`Waterfall`指令，这样只能在你注册的组件中使用`Waterfall`：
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```js
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import { Waterfall } from 'vant';
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export default {
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directives: {
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WaterfallLower: Waterfall('lower'),
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WaterfallUpper: Waterfall('upper')
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}
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};
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```
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### 代码演示
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<script>
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export default {
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data() {
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return {
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list: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10],
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loading: false,
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finished: false
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};
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},
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methods: {
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loadMore() {
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if (this.list.length >= 200) {
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this.finished = true;
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return;
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}
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this.loading = true;
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setTimeout(() => {
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let lastNumber = this.list[this.list.length - 1];
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for (let i = 0; i < 5; i ++) {
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lastNumber += 1;
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this.list.push(lastNumber);
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}
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this.loading = false;
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}, 200);
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}
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},
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computed: {
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isWaterfallDisabled() {
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return this.loading || this.finished;
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}
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}
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};
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</script>
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<style>
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.demo-waterfall {
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ul {
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max-height: 360px;
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overflow: scroll;
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border-top: 1px solid #e5e5e5;
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}
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li {
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line-height: 50px;
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border-bottom: 1px solid #e5e5e5;
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background: #fff;
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text-align: center;
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}
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.page-desc {
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padding: 5px 0;
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line-height: 1.4;
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font-size: 14px;
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text-align: center;
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color: #666;
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}
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}
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</style>
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#### 基础用法
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使用 `v-waterfall-lower` 监听滚动到达底部，并执行相应函数。若是函数执行中需要异步加载数据，可以将 `waterfall-disabled` 指定的值置为 false，禁止 `v-waterfall-lower` 监听滚动事件
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:::demo 基础用法
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```html
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<p class="page-desc">当即将滚动到元素底部时，会自动加载更多</p>
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<ul
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v-waterfall-lower="loadMore"
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waterfall-disabled="isWaterfallDisabled"
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waterfall-offset="400">
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<li v-for="(item, index) in list">{{ item }}</li>
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</ul>
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```
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:::
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### API
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| 参数 | 说明 | 类型 | 默认值 | 可选值 |
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|-----------|-----------|-----------|-------------|-------------|
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| v-waterfall-lower | 滚动到底部, 触发执行的函数 | `Function` | - | |
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| v-waterfall-upper | 滚动到顶部, 触发执行的函数 | `Function` | - | |
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| waterfall-disabled | 在vue对象中表示是否禁止瀑布流触发的key值 | `String` | - | |
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| waterfall-offset | 触发瀑布流加载的阈值 | `Number` | `300` | |
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