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[英]react component state change after ajax call but does not rerender component
[英]Rerender component child after after state change in parent component
您好正在嘗試在更改選擇選項的值后刷新圖,但它顯示了第一個圖,當我更改選擇選項時,狀態已更改,但圖未更改,我認為問題出在狀態更改時生命周期組件中沒改變,只有一次,我該如何解決它,謝謝
import React, { Component } from "react";
import PropTypes from "prop-types";
import { connect } from "react-redux";
import Select from "react-select";
import Graph from "../graph/Graph";
class Home extends Component {
state = {
selectedOption: null
};
handleChange = selectedOption => {
this.setState({ selectedOption });
console.log(`Option selected:`, selectedOption);
};
render() {
const { user } = this.props.auth;
const { organization } = user;
console.log(organization);
//const organization = user.organization;
console.log(user);
//let organization = user.organization[0];
const options = organization.map(org => ({
value: org.conceptPrefix,
label: org.name
}));
const { selectedOption } = this.state;
let graphObject;
if (selectedOption == null) {
graphObject = <h4>Choose Organization</h4>;
} else {
graphObject = (
<div>
<Graph org={this.state.selectedOption.value} />
</div>
);
}
return (
<div>
<Select
value={selectedOption}
onChange={this.handleChange}
options={options}
/>
{graphObject}
</div>
);
}
}
Home.propTypes = {
auth: PropTypes.object.isRequired
};
const mapStateToProps = state => ({
auth: state.auth,
graph: state.graph
});
export default connect(
mapStateToProps,
{}
)(Home);
import React, { Component } from "react";
import PropTypes from "prop-types";
import { connect } from "react-redux";
import { graphGet } from "../../actions/graphActions";
import GraphImp from "./GraphImp";
class Graph extends Component {
constructor(props) {
super(props);
this.state = {
org: props.org
};
}
componentWillReceiveProps(nextProps) {
if (nextProps.errors) {
this.setState({ errors: nextProps.errors });
}
}
componentDidMount() {
this.props.graphGet(this.props.org);
}
render() {
// {this.props.graph.graph && this.state.formSubmitted
// ? this.createList()
// : "wait Graph"}
const { graph, loading } = this.props.graph;
let graphContent;
if (graph == null || loading) {
graphContent = <h4>Loading ...</h4>;
} else {
graphContent = <GraphImp grapheData={graph} />;
}
return <div>{graphContent}</div>;
}
}
Graph.prototypes = {
graphGet: PropTypes.func.isRequired,
auth: PropTypes.object.isRequired,
errors: PropTypes.object.isRequired,
graph: PropTypes.object.isRequired
};
const mapStateToProps = state => ({
auth: state.auth,
graph: state.graph,
errors: state.errors
});
export default connect(
mapStateToProps,
{ graphGet }
)(Graph);
有兩種方法可以實現您的目標。
第一種選擇:在Graph中實現componentDidUpdate
componentDidUpdate(prevProps) {
if(prevProps.org !== this.props.org) {
this.setState({ org: this.props.org });
this.props.graphGet(this.props.org);
}
}
第二種選擇:每當通過更改鍵更改選項時,強制做出反應以完全重新安裝和渲染圖形(確保鍵不是對象/數組)
<Graph key={this.state.selectedOption.value} org={this.state.selectedOption.value} />
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