从设计稿到实现React应用(分类数据处理)
阅读原文时间:2023年07月11日阅读:1

1. 确定设计稿和数据

设计稿:

数据:

[
{category: "Sporting Goods", price: "$49.99", stocked: true, name: "Football"},
{category: "Sporting Goods", price: "$9.99", stocked: true, name: "Baseball"},
{category: "Sporting Goods", price: "$29.99", stocked: false, name: "Basketball"},
{category: "Electronics", price: "$99.99", stocked: true, name: "iPod Touch"},
{category: "Electronics", price: "$399.99", stocked: false, name: "iPhone 5"},
{category: "Electronics", price: "$199.99", stocked: true, name: "Nexus 7"}
];

2. 将设计稿UI分组件层级

组件单一功能原则:

即一个组件实现一个功能。

图中,一个颜色是一种组件,按照嵌套关系,可以分为:

FilterableProductTable:

SearchBar:

ProductTable:

ProductCategoryRow

ProductRow

3. 确定需要的state值的个数

原则:

1. 值不是来自与props

  1. 值不是一成不变
  2. 值不能由其他state和props求得

该示例中,需要数据源的地方有:

1. 查询框的文本 // 会变化;state.filterText

  1. 复选框的状态 // 会变化;state.isStock
  2. 所有的产品列表数据 // 通过props传入; 无state
  3. 过滤后的产品列表数据 //通过1,2,3获得; 无state

4. 确定state的位置-状态提升

通过分析state对应的值作用的范围,state应该位于所有作用区域的父组件;

才能共享state。

从功能分析,1,2的状态会影响列表展示;则其应该位于查询框和列表的父组件;

即组件FilterableProductTable中。

3的状态会影响列表分类ProductCategoryRow和列表项ProductRow,则应该放在他们的父组件;

即组件ProductTable中。

5. 添加反向数据流

即通过触发子组件的事件监听,调用父组件传递过去的函数,从而改变父组件的state的值。

因为state的状态提升,而state又是私有状态,只能通过state所处的组件的函数进行修改。

6. 从下向上编写代码

/*
* @Author: LyraLee
* @Date: 2019-11-08 09:01:58
* @LastEditTime: 2019-11-20 17:32:14
* @Description: 分类数据处理
*/
'use strict'
const products = [
{category: "Sporting Goods", price: "$49.99", stocked: true, name: "Football"},
{category: "Electronics", price: "$399.99", stocked: false, name: "iPhone 5"},
{category: "Sporting Goods", price: "$9.99", stocked: true, name: "Baseball"},
{category: "Electronics", price: "$99.99", stocked: true, name: "iPod Touch"},
{category: "Sporting Goods", price: "$29.99", stocked: false, name: "Basketball"},
{category: "Electronics", price: "$199.99", stocked: true, name: "Nexus 7"}
];
function ProductRow(props) {
const product = props.product;
const { name } = product;
const renderName = !product.stocked ? {name} : name
return (
{renderName} {product.price}
)
}
function ProductCategoryRow(props) {
const product = props.product;
return(
{product.category}
)
}
function ProductTable(props) {
const { filterText, isStockedOnly, products } = props;
// 处理数据的方法!!!需要分类的属性是category,
// 如果数据不是按照该属性排序,那先将其按照category的字段顺序
let lastCategory = null;
let rows = []
products.sort((a,b) => a.category.localeCompare(b.category))
.forEach(product => {
if (!product.name.includes(filterText)) {
return;
}
if (isStockedOnly && !product.stocked) {
return;
}
if (product.category !== lastCategory) {
rows.push()
}
rows.push(

)
lastCategory = product.category;
});

return (

{rows}
name price

)
}
function SearchBar(props) {
function handleChange (e) {
const { name, type } = e.target;
const value = type === 'checkbox' ? e.target.checked : e.target.value;
props.handleChange(name, value);
}
const { filterText, isStockedOnly } = props;
return(

{' '} Only show products in stock


)
}
class FileterableProductTable extends React.Component {
constructor(props) {
super(props);
this.state = {
filterText: '',
isStockedOnly: false
}
}
handleChange = (name, value) => {
this.setState({
[name]: value
})
}
render() {
const { filterText, isStockedOnly } = this.state;
const { products } = this.props;
return(

)
}
}

ReactDOM.render(, root);