我正在使用add button
生成一個動態列表。我可以生成動態列表。但有delete
按鈕也存在於每個li
。我想刪除該項目時按下刪除按鈕。我做一個action
以及還原本文首先我不知道如何綁定動態生成list.I單擊事件我得到錯誤,當用戶按下刪除鍵如何從列表中刪除項目使用刪除按鈕在反應?
這裏是我的代碼 https://plnkr.co/edit/JEG6o4JCBIQWAt2A4S3r?p=preview //代碼放在這裏
const { createStore, bindActionCreators, applyMiddleware,combineReducers } = Redux;
const { Provider, connect } = ReactRedux;
const thunk = window.ReduxThunk.default;
const first_redux =function(state =[] ,action){
switch (action.type){
case 'ADD_ITEM':
return [
...state,
action.payload
];
case 'DELETE_ITEM':
var index = state.indexOf(action.payload);
return state.slice(index,1);
default :
return state
}
}
const actions ={
addItem :function(item){
return {
type :"ADD_ITEM",
payload :item
}
} ,
deleteItem :function(item){
return {
type :"DELETE_ITEM",
payload :item
}
}
}
var combindReducer = combineReducers({
item:first_redux
})
const store = createStore(combindReducer);
class First extends React.Component {
constructor (props){
super(props);
this.state = {
names :[],
username :''
}
this.changeEv =this.changeEv.bind(this);
this.addName =this.addName.bind(this);
this.handle =this.handle.bind(this);
}
changeEv(e){
this.setState({
username : e.target.value
})
}
addName(){
if(this.state.username !== ''){
this.props.add(this.state.username)
this.setState({
username : ''
})
}
}
handle(){
alert('---')
}
render() {
const data =[{"name":"test1"},{"name":"test2"}];
var listItems = this.props.names.map(function(d, idx){
return (<li key={idx}><span>{d}</span><button onClick={this.handle}>delete</button></li>)
})
return (
<div>
<input type="text" onChange ={this.changeEv} value={this.state.username}/>
<button onClick={this.addName}>add</button>
{listItems}
</div>
);
}
}
function mapStateToProps(state){
console.log('=================');
console.log(state);
return {
names: state.item,
};
console.log(this.state);
}
function mapDispatchToProps(dispatch){
return {
add:bindActionCreators(actions.addItem,dispatch)
}
}
const Appcontainer =connect(mapStateToProps,mapDispatchToProps)(First)
ReactDOM.render(
<Provider store ={store}>
<Appcontainer/>
</Provider>
,document.getElementById('root'));
該plunkur不工作。當我點擊添加,我沒有看到生成列表 – Swapnil