[英]Want to populate the input values based on the click of an object inside map(): React+Typescript
我正在維護一個存儲在狀態對象中的對象數組。 基本上,每當我單擊“添加”按鈕時,我都會將每個對象推送到這個數組。這會將這個對象存儲在數組中。
此外,我正在迭代這個對象數組以向下顯示頁面。
現在我正在嘗試根據我單擊的對象填充輸入字段。 我做不到。 基本上,我點擊的對象應該填充輸入字段,然后我應該能夠編輯它
幫助將不勝感激
對象數組的結構:
users= [
{"name":"xxx","email":"yyy","phone":"656"},
{"name":"yyy","email":"xxx","phone":"55"}
];
import * as React from 'react';
interface IState{
users : Account[];
user: Account
}
interface Account{
name: string;
email: string;
phone: string
}
export default class App extends React.Component<{},IState> {
constructor(props:any){
super(props);
this.state= {
users: [],
user: {
name: '',
email: '',
phone: '',
}
}
}
removeAccount = (i:number) => {
let users = [...this.state.users];
users.splice(i,1);
this.setState({users},()=>{console.log('setting the data')});
}
handleChange = ( event: React.ChangeEvent<HTMLInputElement>) => {
this.setState({
user:{
...this.state.user,
[event.currentTarget.name]:event.currentTarget.value
}
})
}
onAdd = () => {
e.preventDefault();
this.setState({
users: [...this.state.users, this.state.user],
user: { name:'', email: '', phone: ''}
},()=>{console.log('adding')});
}
clearInputs = () => {
this.setState({user: { name:'', email: '', phone: ''}});
}
showDetails = (i:number) => { //I need to populate the input fields based on the index of the object clicked.
console.log(i);
}
render(){
const { name, email, phone } = this.state.user;
<React.Fragment>
<form onSubmit={this.onAdd}>
<input type="text" value={name} onChange={(e:any) => this.handleChange(e)} name={"name"} />
<input type="text" value={email} onChange={(e:any) => this.handleChange(e)} name={"email"} />
<input type="text" value={phone} onChange={(e:any) => this.handleChange(e)} name={"phone"} />
<button type="submit">Add</button>
</form>
<ul>
{this.state.users.map((row:any ,index: number) =>
<li key={index}>
<a onClick={()=> this.showDetails(index)}><span>{row.name}</span></a> // on click of this,i need to display the values corresponding to this object in the above input fields
<i className="close far fa-times" onClick={() =>this.removeAccount(index)}/>
</li>
)}
</ul>
</React.Fragment>
}
}
基於代碼的邏輯showDetails
應該看起來像
showDetails = (i:number) => {
this.setState ({user: this.state.users.splice(i,1)});
console.log(i);
}
只需將user
設置為users
數組的選定元素。 React 將執行更新並使用更新的數據調用render()
。
還使用splice
將從數組中刪除當前正在編輯的用戶。 這遵循代碼的邏輯。 編輯后Add
,應點擊添加修改用戶返回到陣列。 這可能不方便,因此您可以考慮在state
添加editingIndex
並指定當前正在編輯的用戶對象。 在這種情況下,您必須在editingIndex
保存所選對象的editingIndex
。 在handleChange
您應該檢查是否現在正在編輯某些用戶對象並不僅在state
user
屬性中而且在相應的users
數組元素中修改數據
interface IState{
users : Account[];
user: Account;
editingIndex: number | null;
}
// In constructor
constructor(props:any){
super(props);
this.state= {
users: [],
user: {
name: '',
email: '',
phone: '',
},
editingIndex: null
}
}
showDetails = (i:number) => {
this.setState ({user: this.state.users[i], editingIndex: i});
console.log(i);
}
handleChange = ( event: React.ChangeEvent<HTMLInputElement>) => {
let user = {...this.state.user,
[event.currentTarget.name]:event.currentTarget.value};
this.setState({user});
// If we currently editing existing item, update it in array
if (this.state.editingIndex !== null) {
let users = [...this.state.users];
users[this.state.editingIndex] = user;
this.setState({users});
}
}
removeAccount = (i:number) => {
let users = [...this.state.users];
// If we're going to delete existing item which we've been editing, set editingIndex to null, to specify that editing ends
if (this.state.editingIndex === i)
this.setState({user: {name: '', email: '', phone: ''}, editingIndex: null});
users.splice(i,1);
this.setState({users},()=>{console.log('setting the data')});
}
onAdd = () => {
e.preventDefault();
// If we NOT editing, but adding new editingIndex will be null so add user to users array. If we editing existing element it's no need to add it once again.
if (this.state.editingIndex === null)
this.setState({ users: [...this.state.users, this.state.user] });
this.setState ({ editingIndex: null,
user: { name:'', email: '', phone: ''}
},()=>{console.log('adding')});
}
// render will have no change
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