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VisualizaçõesReact TypeError: Cannot read properties of undefined (reading 'params')
In React, I have a recursive TreeView which is working fine. When the tree is rendered, from treedata derived props like catid are passed to a TreeNode component which then renders React Link instances. These Links now can have parameters like catid:
<Link to={'/Comp1/' + catid}>{catname}</Link>
and these form the clickable items of the TreeView.
In App.js, I have a Route like this:
<Route path="/Comp1/:catid">
<Comp1 />
</Route>
So when Link is clicked, the parameter catid is passed to the component.
This component Comp1 is structured as follows:
import React, { Component } from 'react';
export default class Comp1 extends Component {
constructor() {
super();
this.state = { catid: 0 };
}
componentDidMount() {
this.setState({
catid: this.props.match.params
});
}
render() {
return (
<div>
Hello, I am class Comp1, clicked item { this.state.catid }
</div>
);
}
};
Now, when running the App, it crashes while debug output is as follows:
1 Respostas
Responde à pergunta0
I found this somewhere.
I had to extend the Route with a render of the target component and you can then specify the params you need as props to the component, which are getting their value from props.match.params:
<Route exact path="/Comp1/:catid/:catname" render={(props) => (
<Comp1 catid={props.match.params.catid} catname={props.match.params.catname} />
)} />
In the Link, you simply say:
<Link to={'/Comp1/' + catid + '/' + catname}>{catname}</Link>
In the target component, you can simply do:
import React, { Component } from 'react';
export default class Comp1 extends Component {
render() {
return (
this.props.catname ? <div>Hello, I am class Comp1, clicked item:
{this.props.catname} id={this.props.catid}</div> : null
);
}
};
Clicking another Link will update component props and rerender.