我的项目是一个对象数组，其中我只获取名称并在 3 中的表单 3 的屏幕上呈现，按钮下一个和上一个更改名称，并且可以过滤字母。
我想添加一个新值，输入输入并单击按钮add。
我的代码按钮：
addItem = () => {
const inValue = {
id: 0,
name: this.state.input
}
this.setState({
filtered: this.state.filtered.concat(inValue),
currentPage: 0
})
}我希望将值插入到filtered数组中。
我的代码全部：
import React, { Component } from 'react';
class App extends Component {
constructor() {
super();
const peoples =[{id:0, name:"Jean"},
{id:1, name:"Jaha"},
{id:2, name:"Rido"},
{id:3, name:"Ja"},
{id:4, name:"Letia"},
{id:5, name:"Di"},
{id:6, name:"Dane"},
{id:7, name:"Tamy"},
{id:8, name:"Tass"},
{id:9, name:"Ts"},
{id:10, name:"Abu"},
{id:11, name:"Ab"}];
this.state = {
elementsPerPage:3,
currentPage:0,
peoples,
input: "",
filtered: peoples,
teste: '',
};
}
getValueInput = (evt) => {
const inputValue = evt.target.value;
this.setState({ input: inputValue });
this.filterNames(inputValue);
}
filterNames = (inputValue)=> {
const { peoples } = this.state;
this.setState({
filtered: peoples.filter(item =>
item.name.includes(inputValue)),
currentPage:0
});
const Oi = this.state.filtered.map(item=>item.name);
if(Oi.length<=0){
alert('Você está adicionando um nome')
}
console.log(Oi)
}
elementsOnScreen = () => {
const {elementsPerPage, currentPage, filtered} = this.state;
return filtered
.map((item) => <li key={item.id}> {item.name} <button onClick={() => this.remove(item.name)}> Delete </button> </li>)
.slice(currentPage*elementsPerPage, currentPage*elementsPerPage + elementsPerPage);
if(this.state.filtered.length < 1){
this.setState({currentPage: this.state.currentPage - 1})
}
}
remove = (id) => {
console.log(this.state.filtered.length)
if(this.state.filtered.length < 0){
this.setState({currentPange: this.state.currenPage - 1})
}
this.setState({filtered: this.state.filtered.filter(item => item.name !== id) })
}
nextPage = () => {
console.log(this.state.filtered)
const {elementsPerPage, currentPage, filtered} = this.state;
if ((currentPage+1) * elementsPerPage < filtered.length){
this.setState({ currentPage: this.state.currentPage + 1 });
}
}
previousPage = () => {
const { currentPage } = this.state;
if(currentPage - 1 >= 0){
this.setState({ currentPage: this.state.currentPage - 1 });
}
}
addItem = () =>{
const inValue = {id:0 ,name: this.state.input}
this.setState({filtered: this.state.filtered.concat(inValue), currentPage: 0})
}
render() {
return (
<div>
<button onClick={this.addItem}> Add </button>
<input type="text" onChange={ this.getValueInput }></input>
<button onClick={this.previousPage}> Previous </button>
<button onClick={this.nextPage}> Next </button>
<h3>Current Page: {this.state.currentPage}</h3>
<ul>Names: {this.elementsOnScreen()}</ul>
</div>
);
}
}
export default App;