我遇到一个问题,加载页面后,我可以按“姓名”列(升序或降序)对表格进行排序 - - 或 - - 使用搜索栏过滤员工姓名。我的问题是,一旦我按字母顺序排序,搜索/过滤器就不再起作用。
我对 React 很陌生(我确信我的代码很明显),所以如果有明显的错误,请告诉我。提前致谢!
import React, { Component } from "react";
import API from "../utils/API"
import EmployeeRow from "./EmployeeRow"
class TableMain extends Component {
state = {
result: [],
search: "",
sortOrder: "descending"
}
componentDidMount() {
API.search()
.then(results => {
console.log(results)
this.setState({
result: results.data.results.map((res, i) => ({
image: res.picture.large,
firstName: res.name.first,
lastName: res.name.last,
phone: res.phone,
email: res.email,
dob: res.dob.date,
key: i
})
)
})
})
};
filterResults = (results) => {
const value = this.state.search
const finalResult = results.filter((employee) => {
const lastName = employee.lastName.toLowerCase();
const firstName = employee.firstName.toLowerCase()
const fullName = firstName + " " + lastName
if (fullName.includes(value)) {
return employee
}
});
return finalResult
};
sortResults = (event) => {
const results = this.state.result
// const id = event.target.id
// if (id === 'name'){
// } else if (id === 'phone'){
// } else if (id === 'email'){
// }
if (this.state.sortOrder === "descending") {
results.sort((a, b) => {
if (a.firstName > b.firstName) {
return -1
}
return a.firstName > b.firstName ? 1 : 0
},
this.setState({ sortOrder: "ascending" }))
} else if (this.state.sortOrder === "ascending") {
results.sort((a, b) => {
if (a.firstName < b.firstName) {
return -1
}
return a.firstName > b.firstName ? 1 : 0
},
this.setState({ sortOrder: "descending" }))
}
console.log("RESULTS: ", results)
this.setState({
sortedResults: results,
isSorted: true
})
}
onChange = e => {
const value = e.target.value;
if (!value) {
this.setState({ isSearchEmpty: true });
} else {
this.setState({ search: e.target.value, isSearchEmpty: false });
}
}
render() {
// console.log("State", this.state)
let employeeResults = this.state.result
if (this.state.isSearchEmpty) {
employeeResults = this.state.result
} else {
employeeResults = this.filterResults(this.state.result)
}
if (this.state.isSorted) {
employeeResults = this.state.sortedResults
}
return (
<div>
<input label="Search" onChange={this.onChange} />
<div className="row">
<table style={{ width: "100%" }}>
<tbody>
<tr>
<th>Image</th>
<th style={{ cursor: "pointer" }} onClick={this.sortResults} id="name">Name</th>
<th id="phone">Phone</th>
<th id="email">Email</th>
<th id="dob">DOB</th>
</tr>
{[...employeeResults].map((item) =>
<EmployeeRow
image={item.image}
firstName={item.firstName}
lastName={item.lastName}
email={item.email}
phone={item.phone}
dob={item.dob}
key={item.key}
/>
)}
</tbody>
</table>
</div>
</div>
)}
}
export default TableMain;
最佳答案
问题是:
if (this.state.isSorted) {
employeeResults = this.state.sortedResults;
}
排序时,您将 state.isSorted
设置为 true,但完成后您永远不会将其设置回 false。当您尝试过滤时,您将执行过滤:
if (this.state.isSearchEmpty) {
employeeResults = this.state.result;
} else {
employeeResults = this.filterResults(this.state.result);
}
if (this.state.isSorted) { // this is never reset after sorting.
employeeResults = this.state.sortedResults;
}
但是由于 this.state.isSorted
仍然为 true,因此您再次使用 this.state.sortedResults
中的值。
please let me know if there's something obvious I'm doing wrong
您正在为自己制造麻烦,因为您正在过滤/排序相同的数据集合。这就是为什么您需要在渲染中执行该操作,因为您正在尝试维护原始列表以供以后使用。
如果您将列表分为两个集合:原始未修改列表和显示列表,您始终可以引用原始列表来执行过滤/排序。
componentDidMount() {
API.search().then(results => {
const tableData = results.data.results.map((res, i) => ({
image: res.picture.large,
firstName: res.name.first,
lastName: res.name.last,
phone: res.phone,
email: res.email,
dob: res.dob.date,
key: i
}));
this.setState({ originalResults: tableData, displayResults: tableData });
});
}
一旦发生onChange
,就可以进行过滤:
onChange = e => {
const query = e.target.value;
this.setState(prevState => ({
displayResults:
query.length > 0
? this.filterResults(query, prevState.originalResults)
: prevState.originalResults
}));
};
排序也类似,可以对显示结果而不是整体执行排序,这意味着您现在可以对过滤结果进行排序。
我在这里创建了一个示例 https://codesandbox.io/s/sad-cannon-d61z6
我删除了所有缺失的功能。
关于javascript - 如何用React对同一张表数据进行过滤和排序?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/61284113/