react点滴

 

1.<SubSubComp {...this.props } /> 传递属性,{...props}的方式为组件传递了这两个属性,这就是JSX中的延展属性,"..."成为延展操作符,这种方式可以很方便地为组件指定多个属性   http://blog.csdn.net/yubo_725/article/details/50531817

2.mixin那里我真的没有看懂哈。

3.

<script type="text/jsx">
var FormApp = React.createClass({
  getInitialState:function(){
    return {
      inputValue: 'input value',
      selectValue: 'A',
      radioValue:'B',
      checkValues:[],
      textareaValue:'some text here,,,'
    }
},
  handleSubmit:function(e){
  e.preventDefault();
  var formData = {
  input: this.refs.goodInput.getDOMNode().value,
  select: this.refs.goodSelect.getDOMNode().value,
  textarea: this.refs.goodTextarea.getDOMNode().value,
  radio: this.state.radioValue,
  check: this.state.checkValues,
}

  console.log('the form result is:')
  console.log(formData);

  this.refs.goodRadio.saySomething();

},
  handleRadio:function(e){
    this.setState({
      radioValue: e.target.value,
  })
},
handleCheck:function(e){
  var checkValues = this.state.checkValues.slice();
  var newVal = e.target.value;
  var index = checkValues.indexOf(newVal);
  if( index == -1 ){
    checkValues.push( newVal )
  }else{
  checkValues.splice(index,1);
}

  this.setState({
    checkValues: checkValues,
  })
},
render: function(){
  return (
  <form onSubmit={this.handleSubmit}>
  <input ref="goodInput" type="text" defaultValue={this.state.inputValue }/>
  <!-- 这里的ref还可以这样写哈 function(comp){React.findDOMNode(comp).focus()} -->
  <br/>
  选项:
  <select defaultValue={ this.state.selectValue } ref="goodSelect">
  <option value="A">A</option>
  <option value="B">B</option>
  <option value="C">C</option>
  <option value="D">D</option>
  <option value="E">E</option>
  </select>
  <br/>
  <p>radio button!</p>
  <RadioButtons ref="goodRadio" handleRadio={this.handleRadio} />
  <br/>

  <Checkboxes handleCheck={this.handleCheck} />
  <br/>
  <textarea defaultValue={this.state.textareaValue} ref="goodTextarea"></textarea>
  <button type="submit">提交</button>

</form>
)
}
});

var RadioButtons = React.createClass({
  saySomething:function(){
    alert("yo what's up man!");
  },
render:function(){
  return (
    <span>
    A
    <input onChange={this.props.handleRadio} name="goodRadio" type="radio" value="A"/>
    B
    <input onChange={this.props.handleRadio} name="goodRadio" type="radio" defaultChecked value="B"/>
    C
    <input onChange={this.props.handleRadio} name="goodRadio" type="radio" value="C"/>
    </span>
  )
  }
});

var Checkboxes = React.createClass({
    render: function(){
      return (
      <span>
      A
      <input onChange={this.props.handleCheck} name="goodCheckbox" type="checkbox" value="A"/>
      B
      <input onChange={this.props.handleCheck} name="goodCheckbox" type="checkbox" value="B" />
      C
      f<input onChange={this.props.handleCheck} name="goodCheckbox" type="checkbox" value="C" />
    </span>)
}
})


var formApp = React.render(
    <FormApp />,
    document.getElementById('app')
)


</script>

 4.minxins的双向数据绑定。

<script type="text/jsx">
		var EasyForm = React.createClass({
			mixins: [ React.addons.LinkedStateMixin ],
			getInitialState:function(){
				return {
					message: 'react is awesome!',
					isReactAwesome: true,
				}
			},
			render:function(){
				return (
					<div>
						<h1>我想说: {this.state.message}</h1>
						<h2>React是不是很好用? {this.state.isReactAwesome?'非常好用!':'一般般。。。'}</h2>
						<input type="text" valueLink={this.linkState('message')} />
						<br/>
						<input type="checkbox" checkedLink={this.linkState('isReactAwesome') } />
						<br/>
						<SubComp messageLink={ this.linkState('message') } likeLink={this.linkState('isReactAwesome')} />

					</div>
				)
			}
		});

		var SubComp = React.createClass({
			render:function(){
				return (
					<div>
						<h3>这是个子组件哦</h3>
						<SubSubComp {...this.props } />
					</div>
				)
			}
		});

		var SubSubComp = React.createClass({
			render:function(){
				return (
					<div>
						<p>你想说什么?</p>
						<input type="text" valueLink={ this.props.messageLink } />
						<p>你稀罕React么?</p>
						<input type="checkbox" checkedLink = {this.props.likeLink } />
					</div>
				)
			}
		})


		React.render( <EasyForm />, document.getElementById('app') );


	</script>

4.生命周期的函数:

getInitialState

getDefaultProps

componentWillMount

componentDidMount

componentWillUnmount

killMySelf

shouldComponentUpdate

componentWillUpdate

componentDidUpdate

doUpdate

posted @ 2016-10-15 17:59  飘然离去  阅读(150)  评论(0编辑  收藏  举报