React.js-传递的函数“不是函数"错误 [英] React.js - Passed function "not a function" Error
问题描述
我试图将道具从子组件传递到父组件,但是由于某种原因,在单击渲染后,在js控制台中出现错误"TypeError:this.props.onClick is a function"子组件.
I am trying to pass props from a child component to a parent component, but for some reason I'm getting the error "TypeError: this.props.onClick is not a function" in the js console after clicking on the rendered child components.
基本上,我想做的是管理一个类别列表,其中一个类别子组件具有"selected"属性为true,并在每次单击类别li时正确更新.
Basically what I am trying to do is manage a list of categories in which one category subcomponent has the 'selected' prop as true, and updates correctly every time you click on a category li.
这是一个具有以下代码的jsfiddle: http://jsfiddle.net/kb3gN/8023/
Here is a jsfiddle with the code: http://jsfiddle.net/kb3gN/8023/
我真的还不太了解如何有效使用React.js的概念,因此可以提供任何帮助!
I don't really feel like I've grasped the concepts of how to use React.js effectively yet, so any help is appreciated!
最好的问候和感谢,
bnunamak
代码:
var CategoryList = React.createClass({
getInitialState:function(){
return {
items:[
["cat1", false],
["cat2", true]
],
lastToggled:["cat2"]
}
},
//Function passed to child (changes items state)
handleClick:function(child){
var tempItems = this.state.items;
if(this.state.lastToggled[0] === child.props.name){
var index = this.getInd(this.state.tempItems, child.props.name);
tempItems[index][1] = !tempItems[index][1];
this.setState({items: tempItems});
}else{
var newIndex = this.getInd(this.state.tempItems, child.props.name);
tempItems[newIndex][1] = !tempItems[newIndex][1];
var oldIndex = this.getInd(this.state.tempItems, this.state.lastToggled[0]);
tempItems[oldIndex][1] = false;
this.setState({items: tempItems, lastToggled: tempItems[newIndex][0]});
}
},
//getInd not relevant to problem
getInd:function(arr, elname){
for (var i = arr.length - 1; i >= 0; i--) {
if(arr[i][0] === elname){
return i;
}
};
return -1;
},
render:function(){
return (<ul className="category-list">
{
this.state.items.map(function(item){
return <Category onClick={this.handleClick} name={item[0]} selected={item[1]} />;
})
}
</ul>)
}
});
var Category = React.createClass({
render:function(){
if(this.props.selected){
return (<li onClick={this.propogateClick} className="selected">{this.props.name}</li>);
}else{
return (<li onClick={this.propogateClick}>{this.props.name}</li>);
}
},
propogateClick: function(){
this.props.onClick(this);
}
});
React.renderComponent(<CategoryList/>, document.getElementById('example'));
推荐答案
您可以使用bind解决此问题
You can use bind to solve this problem
this.state.items.map(function(item){
return <Category onClick={this.handleClick} name={item[0]} selected={item[1]} />;
}.bind(this))
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