我喜欢在事件触发onDrag上将子属性的属性/ props / state值从子组件发送到父组件.我找不到合适的文件.
这是我的代码：
/*** @jsx React.DOM */
var APP=React.createClass({
getInitialState:function()
{
return {url:'http://www.youtube.com/embed/XGSy3_Czz8k'}
},handleDrag:function(vidurl)
{
alert(vidurl); //i need to get child component url here.
},render:function(){
return <div>
<VideoFrame src={this.state.url} />
<hr/>
<videos handle={this.handleDrag(vidurl)} />
</div>
}
});
var VideoFrame=React.createClass({
render:function(){
return <div>
<iframe width="420" height="315" src={this.props.src}>
</iframe>
</div>
}
});
var videos=React.createClass({
getInitialState:function()
{
return {vidurl:'http://www.youtube.com/embed/XGSy3_Czz8k'}
},render:function()
{
return <img src="http://upload.wikimedia.org/wikipedia/en/a/a6/Size_Small.PNG" onDrag={this.props.handle.bind(this.state.vidurl)}></img> //trying to send state value from here
}
});
React.renderComponent(<APP />,document.body);
我希望我的代码清楚.
解决方法
在App组件中这一行
<videos handle={this.handleDrag(vidurl)} />
在VideoForm这一行
return <img src="http://upload.wikimedia.org/wikipedia/en/a/a6/Size_Small.PNG" onDrag={this.props.handle.bind(this.state.vidurl)}></img> //trying to send state value from here
是不正确的,this.props.handle是父回调,应该只调用this.props.handle(this.state.videoUrl)
正确实施：
var APP = React.createClass({
getInitialState:function() {
return {url:'http://www.youtube.com/embed/XGSy3_Czz8k'}
},// Parent callback,pass this function to the child component
handleDrag:function(videoUrl) {
alert(videoUrl);
},render: function() {
return (
<div>
<Videos handle={this.handleDrag} />
</div>
);
})
var Videos = React.createClass({
getInitialState:function()
{
return {vidurl:'http://www.youtube.com/embed/XGSy3_Czz8k'}
},handleChanged: function(event) {
if(this.props.handle) {
this.props.handle(this.state.videoUrl);
}
},render:function()
{
return <img src="http://upload.wikimedia.org/wikipedia/en/a/a6/Size_Small.PNG" onDrag={this.handleChanged}></img> //trying to send state value from here
}
});
