[英]updating the state in componentwillreceive Props where state is an array
I have an array as a state . 我有一个数组作为状态。
let coursedata=[];
class XYZ extends React.Component {
constructor(props) {
super(props);
this.state = {
coursedata
};
}
componentWillReceiveProps(newProps) {
if (newProps.course.courses.data) {
const newstate = [
...this.state.coursedata,
newProps.courses.courses.data
];
this.setState({
coursedata: newstate
});
}
}
Please not that newProps.course.courses.data is an array of objects. 请不要newProps.course.courses.data是对象数组。 My goal is to have state as an array of objects.
我的目标是将状态作为对象数组。
I assume you want to concatenate newProps.course.courses.data
to state.courseData. 我假设您想将
newProps.course.courses.data
连接到state.courseData。 If that is the case, simple solution would be: 如果是这样,简单的解决方案将是:
componentWillReceiveProps(newProps) {
const {courseData} = this.state;
if(newProps.course.courses.data) {
return this.setState({
courseData: courseData.concat(newProps.course.courses.data),
});
}
}
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