ReactJS中的自定义组件
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可控自定义组件：
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <script src="js/react.js"></script> <script src="js/react-dom.js"></script> <script src="js/browser.min.js"></script> </head> <body> <script type="text/babel"> var Radio=React.createClass({ getInitialState:function(){ return { value:this.props.defaultValue }; }, handleChange:function(event){ if(this.props.onChange){ this.props.onChange(event); } this.setState({ value:event.target.value }); }, render:function(){ var children=[]; var value=this.props.value||this.state.value; React.Children.forEach(this.props.children,function(child,i){ var label=<label key={i}> <input type="radio" name={this.props.name} value={child.props.value} checked={child.props.value==value} onChange={this.handleChange}/> {child.props.children} <br/> </label>; children.push(label); }.bind(this)); return <span>{children}</span>; } }); var MyForm=React.createClass({ getInitialState:function(){ return ({my_radio:"B"}); }, handleChange:function(event){ this.setState({ my_radio:event.target.value }); }, submitHandler:function(event){ event.preventDefault(); alert(this.state.my_radio); }, render:function(){ return ( <form onSubmit={this.submitHandler}> <Radio value={this.state.my_radio} name="my_radio" onChange={this.handleChange}> <option value="A">First option</option> <option value="B">Second option</option> <option value="C">Third option</option> </Radio> <button type="submit">Speak</button> </form> ) } }); ReactDOM.render(<MyForm></MyForm>,document.body); </script> </body> </html>
不可控的自定义组件:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script src="js/react.js"></script>
<script src="js/react-dom.js"></script>
<script src="js/browser.min.js"></script>
</head>
<body>
<script type="text/babel">
var Radio=React.createClass({
getInitialState:function(){
return {
value:this.props.defaultValue
};
},
handleChange:function(event){
if(this.props.onChange){
this.props.onChange(event);
}
this.setState({
value:event.target.value
});
},
render:function(){
var children=[];
var value=this.props.value||this.state.value;
React.Children.forEach(this.props.children,function(child,i){
var label=<label>
<input type="radio" name={this.props.name} value={child.props.value} checked={child.props.value==value} onChange={this.handleChange}/>
{child.props.children}
<br/>
</label>;
children[‘label‘+i]=label;
}.bind(this));
return <span>{children}</span>;
}
});
var MyForm=React.createClass({
handleSubmit:function(event){
event.preventDefault();
alert(this.refs.radio.state.value);
},
render:function(){
return (
<form onSubmit={this.handleSubmit}>
<Radio ref="radio" name="my_radio" defaultValue="B">
<p value="A">First</p>
<option value="B">Second option</option>
<option value="C">Third option</option>
</Radio>
<button type="submit">Speak</button>
</form>
)
}
});
ReactDOM.render(<MyForm></MyForm>,document.body);
</script>
</body>
</html><!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script src="js/react.js"></script>
<script src="js/react-dom.js"></script>
<script src="js/browser.min.js"></script>
</head>
<body>
<script type="text/babel">
var Radio=React.createClass({
getInitialState:function(){
return {
value:this.props.defaultValue
};
},
handleChange:function(event){
if(this.props.onChange){
this.props.onChange(event);
}
this.setState({
value:event.target.value
});
},
render:function(){
var children=[];
var value=this.props.value||this.state.value;
React.Children.forEach(this.props.children,function(child,i){
var label=<label>
<input type="radio" name={this.props.name} value={child.props.value} checked={child.props.value==value} onChange={this.handleChange}/>
{child.props.children}
<br/>
</label>;
children[‘label‘+i]=label;
}.bind(this));
return <span>{children}</span>;
}
});
var MyForm=React.createClass({
handleSubmit:function(event){
event.preventDefault();
alert(this.refs.radio.state.value);
},
render:function(){
return (
<form onSubmit={this.handleSubmit}>
<Radio ref="radio" name="my_radio" defaultValue="B">
<p value="A">First</p>
<option value="B">Second option</option>
<option value="C">Third option</option>
</Radio>
<button type="submit">Speak</button>
</form>
)
}
});
ReactDOM.render(<MyForm></MyForm>,document.body);
</script>
</body>
</html>
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