taro-listview
v2.0.4
Published
listView pullDownRefresh and skeleton
Downloads
65
Maintainers
Readme
- [x] 列表内部懒模块-解决小程序图片过多内存问题
- [ ] skeleton 拓展状态屏
- [ ] virtual-list(WIP)【虚拟列表】
- [x] 支持TaroV3 、NPM版本2.x.x
安装方式
安装:
npm i taro-listview
,yarn add taro-listview
使用案例
引入组件
!!!需给组件设置固定高度
API
ListView
可配置参数
页面状态控制参数
| 属性 | 说明 | 类型 | 默认值 | 必传 | | :---------------- | :---------------------------------------------- | :---------------- | :-------------------- | :--- | | style | - | - | - | - | | lazy | 开启懒加载(传入字符串为父元素 className 且开启) | boolean or string | false or '.lazy-view' | - | | hasMore | 加载更多 | boolean | true | true | | isEmpty | 展示空凭页 | boolean | - | - | | isError | 展示错误页 | boolean | - | - | | needInit | 初始化&自动调用下拉刷新方法 | boolean | - | - | | distanceToRefresh | 下拉刷新距离 | number | - | - | | damping | 最大下拉距离 | number | - | - | | autoHeight | 开启自适应高度 | boolean | - | - | | lazyStorage | Storage Key值用于区分ListView | string | box | - |
自定义页面 UI(状态提示语,空白屏、错误屏、底部状态的 UI 自定义)
| 属性 | 说明 | 类型 | 默认值 | 必传 |
| :------------------ | :--------------------------------------------------------------- | :-------- | :------------------------------------------------------------------------------------------------------ | :--- |
| color | 下拉加载时 loading 的颜色 | string | #667baf | - |
| emptyText | 空白页提示语 | string | - | - |
| footerLoadedText | 列表底部加载完毕提示语 | string | - |
| footerLoadingText | 列表底部加载中提示语 | string | 加载中 | - |
| launch | *是否开启状态屏的渲染,状态屏节点对应以下 renderXX 属性(如下) | object | { launchError = false, launchEmpty = false, launchFooterLoaded = false, launchFooterLoading = false }
| - |
| renderError | 错误页 | Taro.Node | - | - |
| renderEmpty | 空白页 | Taro.Node | - | - |
| renderFooterLoaded | 自定义底部加载完毕 | Taro.Node | - | - |
| renderFooterLoading | 自定义底部加载 | Taro.Node | - | - |
| indicator | 下拉提示语 | Object | { release = '加载中', activate = '下拉刷新', deactivate = '释放刷新'}
| - |
*错误屏中重新初始化方法与下拉刷新方法一致
import Taro, { Component } from "@tarojs/taro";
import { View, Image } from "@tarojs/components";
import ListView, { LazyBlock } from "taro-listview";
const blankList = [
{
author: {},
title: "this is a example"
},
{
author: {},
title: "this is a example"
},
{
author: {},
title: "this is a example"
},
{
author: {},
title: "this is a example"
}
];
let pageIndex = 1;
export default class Index extends Component {
state = {
isLoaded: false,
error: false,
hasMore: true,
isEmpty: false,
list: blankList
};
getData = async (pIndex = pageIndex) => {
if (pIndex === 1) this.setState({ isLoaded: false });
const {
data: { data }
} = await Taro.request({
url: "https://cnodejs.org/api/v1/topics",
data: {
limit: 10,
page: pIndex
}
});
console.log({ data });
return { list: data, hasMore: true, isLoaded: pIndex === 1 };
};
componentDidMount() {
this.refList.fetchInit();
}
pullDownRefresh = async () => {
pageIndex = 1;
const res = await this.getData(1);
this.setState(res);
};
onScrollToLower = async fn => {
const { list } = this.state;
const { list: newList, hasMore } = await this.getData(++pageIndex);
this.setState({
list: list.concat(newList),
hasMore
});
fn();
};
refList = {};
insRef = node => {
this.refList = node;
};
render() {
const { isLoaded, error, hasMore, isEmpty, list } = this.state;
return (
<View className="skeleton lazy-view">
<ListView
lazy
ref={node => this.insRef(node)}
isLoaded={isLoaded}
isError={error}
hasMore={hasMore}
style={{ height: "100vh" }}
isEmpty={isEmpty}
onPullDownRefresh={this.pullDownRefresh}
onScrollToLower={this.onScrollToLower}
lazyStorage='lazyView'
>
{list.map((item, index) => {
return (
<View className="item skeleton-bg" key={index}>
<LazyBlock current={index} className="avatar" lazyStorage='lazyView'>
<Image
className="avatar skeleton-radius"
src={item.author.avatar_url}
/>
</LazyBlock>
<View className="title skeleton-rect">{item.title}</View>
</View>
);
})}
</ListView>
</View>
);
}
}
模块懒加载
1.模块需固定同一高度。
2.只能在 ListView 组件内使用,并开启 lazy 模式,且父元素的 className='lazy-view'!!!
3.组件需传入模块遍历后的下标。
API
LazyBlock
| 属性 | 说明 | 类型 |默认值 |必传 | | :------- | :--------------- | :--------- |:--------- |:--------- | | current | 传入模块遍历后的下标 | number | null | true | | lazyStorage | Storage Key值用于区分ListView(获取是哪一个ListView) | string | box | - |
import Taro, { Component } from "@tarojs/taro";
import { View, Image } from "@tarojs/components";
import ListView, { LazyBlock } from "taro-listView";
let pageIndex = 1;
export default class Index extends Component {
state = {
isLoaded: false,
error: false,
hasMore: true,
isEmpty: false,
list: []
};
getData = async (pIndex = pageIndex) => {
if (pIndex === 1) this.setState({ isLoaded: false });
const {
data: { data }
} = await Taro.request({
url: "https://cnodejs.org/api/v1/topics",
data: {
limit: 10,
page: pIndex
}
});
return { list: data, hasMore: true, isLoaded: pIndex === 1 };
};
componentDidMount() {
this.getData();
}
onScrollToLower = async fn => {
const { list } = this.state;
const { list: newList, hasMore } = await this.getData(++pageIndex);
this.setState({
list: list.concat(newList),
hasMore
});
fn();
};
render() {
const { isLoaded, error, hasMore, isEmpty, list } = this.state;
return (
<View className="lazy-view">
<ListView
lazy
isLoaded={isLoaded}
hasMore={hasMore}
style={{ height: "100vh" }}
onScrollToLower={this.onScrollToLower}
lazyStorage='lazyViewBlock'
>
{list.map((item, index) => {
return (
<View className='item' key={index}>
<LazyBlock current={index} className='avatar' lazyStorage='lazyViewBlock'>
<Image className='avatar' src={item.author.avatar_url} />
</LazyBlock>
<View className="title">{item.title}</View>
</View>
);
})}
</ListView>
</View>
);
}
}
骨架屏
1.因骨架屏是捕捉已有占位数据的样式,再绘制出骨架,所以要先注入默认空白占位数据。
2.且需要一个传入父元素的 className(默认获取为“skeleton”),以便寻找元素下的所有“关节”元素。可通过传入 selector 参数自定义 className。
有且只有捕捉以下提供的“关节”样式名:背景('skeleton-bg')、矩阵('skeleton-rect')、圆形('skeleton-redius')。
3.ListView 组件已嵌套 Skeleton 组件,直接调用对应属性即可。
*“关节”元素需内容撑开,或者固定高度。
API
Skeleton
| 属性 | 说明 | 类型 | 默认值 | 必传 | | :------- | :------------------------------------ | :------- | :----- | :--- | | isLoaded | 骨架屏是否显示(eg:加载第一页时开启) | boolean | false | - | | selector | 骨架屏外层 class 名称 | skeleton | - | - |
import Taro, { useState } from "@tarojs/taro";
import { View, Button } from "@tarojs/components";
import { Skeleton } from "components";
import "./index.scss";
export default () => {
const [isLoaded, setLoaded] = useState(false);
return (
<View>
<Button onClick={() => setLoaded(!isLoaded)}>toggle</Button>
<View className="skeleton">
<Skeleton isLoaded={isLoaded}>
{Array(4)
.fill(1)
.map(i => (
<View className="item skeleton-bg" key={i}>
<View className="avatar skeleton-radius" />
<View className="title skeleton-rect">title</View>
</View>
))}
</Skeleton>
</View>
</View>
);
};
方法参数
| 事件名称 | 说明 | 类型 | 默认值 | 必传 | | :---------------- | :--------------- | :------- | :----- | :--- | | onPullDownRefresh | 下拉刷新触发函数 | function | - | - | | onScrollToLower | 上拉底触发函数 | function | - | - |
onPullDownRefresh = () => {
getData();
};
onScrollToLower = async fn => {
await getData();
fn();
};