这个功能实现的步骤如下所示：
最终实现全选和反选，代码如下所示：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<script src="./js/react.js"></script>
<script src="./js/react-dom.js"></script>
<script src="./js/browser.min.js"></script>
</head>
<body>
<div id="dome"></div>
<script type="text/babel">
//搜索区域
var Ck = React.createClass({
//处理搜索事件的函数
handleKey:function(e){
//alert('test');
//判断回车enter键才处理,keyCode13==回车键
if(e.keyCode == 13){
//alert('test');
//如果搜索内容是空的让他不走了
if(!e.target.value) return;
//否则添加任务了
var ckcon = {
text : e.target.value,
isDown: false
}
//利用属性完成
this.props.addCkcon(ckcon);
//清空搜索框的内容
e.target.value = '';
} },
render:function(){
return(
<div>
<input type="text" placeholder="你要干嘛？" onKeyUp={this.handleKey} />
</div>
);
}
});
//列表项区域
var Lists = React.createClass({
handleClick:function(){
//alert('test');
this.props.deleteCkcon(this.props.index);
},
//处理单选框的变化事件
handleChange:function(e){
//修改那个任务，修改的值是什么
this.props.changeStatus(this.props.index,e.target.checked);
},
render:function(){
return(
<li>
<label>
<input type="checkbox" checked={this.props.todo.isDown} onChange={this.handleChange} />
{this.props.todo.text}
</label>
<button onClick={this.handleClick}>删除</button>
</li>
);
}
});
//列表框区域
var Ul = React.createClass({
render:function(){
//保存this指针
var _this = this;
return(
<ul>
{
this.props.todos.map(function(item,index){
return <Lists todo={item} key={index} index={index} deleteCkcon={_this.props.deleteCkcon} changeStatus={_this.props.changeStatus} />
})
}
</ul>
);
}
});
//状态组建
var Status = React.createClass({
handleClick:function(){
//alert('test');
//删除已完成的
this.props.deleteDown();
},
handleChange:function(e){
this.props.changeAllStatus(e.target.checked);
},
render:function(){
return(
<div>
<input type="checkbox" checked={this.props.isAllChecked} onChange={this.handleChange} />
{this.props.countDown} 已完成 / {this.props.total} 总数
<button onClick={this.handleClick}>清除已完成</button>
</div>
);
}
});
//总组建
var Zong = React.createClass({
getInitialState:function(){
return {
todos :[
{text:'6点起床',isDown:true},
{text:'7点出门',isDown:true},
{text:'8点吃早饭',isDown:false},
{text:'9点上班',isDown:true},
{text:'12点下班',isDown:false}
],
isAllChecked: false
}
},
addCkcon:function(todo){
//接收到用户的添加的内容然后铺push过去即可
this.state.todos.push(todo);
//然后更新state
this.setState({
todos : this.state.todos
});
},
//处理删除任务
deleteCkcon:function(index){
//用函数splice来删除掉指定的数组元素
this.state.todos.splice(index,1);
//删除完成后来更新下页面的内容
this.setState({
todos : this.state.todos
});
},
//任务单选框的属性
changeStatus:function(index,isDown){
this.state.todos[index].isDown = isDown
this.setState({
todos : this.state.todos
})
this.checkAll();
},
//如果所有任务都完成了，就设置isAllChecked都为true
checkAll:function(){
if(this.state.todos.every(function(todo){ return todo.isDown})){
this.setState({
isAllChecked:true
});
}else{
this.setState({
isAllChecked:false
});
}
},
//统计总的任务个数
total:function(){
return this.state.todos.length || 0
},
//统计已完成的
countDown:function(){
var arr = this.state.todos.filter(function(todo){
return todo.isDown
});
return arr.length || 0;
},
//删除已完成的任务
deleteDown:function(){
var arr = this.state.todos.filter(function(todo){
return !todo.isDown
});
this.setState({
todos:arr
});
this.checkAll();
},
changeAllStatus:function(isDown){
//修改todos里面每个任务的状态
this.state.todos.forEach(function(todo){
todo.isDown = isDown;
});
//修改isAllChecked里面的值
this.setState({
todos:this.state.todos,
isAllChecked:isDown
}); },
render:function(){
return(
<div>
<Ck addCkcon={this.addCkcon} />
<Ul todos={this.state.todos} deleteCkcon={this.deleteCkcon} changeStatus={this.changeStatus} />
<Status total={this.total()} countDown={this.countDown()} deleteDown={this.deleteDown} isAllChecked={this.state.isAllChecked} changeAllStatus={this.changeAllStatus} />
</div>
);
}
});
ReactDOM.render(
<Zong />,
document.getElementById('dome')
);
</script>
</body>
</html>