I wanted to display a d3 graphics inside a modal window created using react-bootstrap. First I tried displaying d3 circle directly inside (non-modal) div
element. I tried it as follows:
import "./styles.css";
import React from "react";
import * as d3 from "d3";
export default class App extends React.Component {
testRef = React.createRef();
constructor(props) {
super(props);
this.changeText = this.changeText.bind(this);
}
async changeText() {
let svg = d3
.select(this.testRef.current)
.append("svg")
.attr("width", 200)
.attr("height", 200);
// Add the path using this helper function
svg
.append("circle")
.attr("cx", 100)
.attr("cy", 100)
.attr("r", 50)
.attr("stroke", "black")
.attr("fill", "#69a3b2");
// this.testRef.current.innerHtml = "Test123";
}
render() {
return (
<>
<div className="App">
<div ref={this.testRef} />
<button onClick={this.changeText}> Draw circle inside div </button>
</div>
</>
);
}
}
And its working as can be seen in this codesandbox :
Now I tried to add d3 circle to modal popup created using react-bootstrap as shown below:
import React from "react";
import ReactDOM from "react-dom";
import Modal from "react-bootstrap/Modal";
import Button from "react-bootstrap/Button";
import ButtonToolbar from "react-bootstrap/ButtonToolbar";
import * as d3 from "d3";
import "./styles.css";
class App extends React.Component {
constructor(...args) {
super(...args);
this.state = { modalShow: false };
}
testRef = React.createRef();
showD3 = () => {
this.setState({ modalShow: true });
// console.log(this.testRef.current);
let svg = d3
.select(this.testRef.current)
.append("svg")
.attr("width", 200)
.attr("height", 200);
// Add the path using this helper function
svg
.append("circle")
.attr("cx", 100)
.attr("cy", 100)
.attr("r", 50)
.attr("stroke", "black")
.attr("fill", "#69a3b2");
};
render() {
let modalClose = () => this.setState({ modalShow: false });
return (
<>
<ButtonToolbar>
<Button variant="primary" onClick={this.showD3}>
Launch vertically centered modal
</Button>
</ButtonToolbar>
<Modal show={this.state.modalShow} onHide={modalClose}>
<Modal.Header closeButton>
<Modal.Title>Modal heading</Modal.Title>
</Modal.Header>
<Modal.Body>
D3 in React
<div ref={this.testRef}></div>
</Modal.Body>
</Modal>
</>
);
}
}
const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);
However this doesnt work as can be seen in this codesandbox :
It does show the modal dialog, but without D3 circle. Why is this so?
I realized that we have to handle rendering in component life cycle methods. In this case in componentDidMount
method. We have to just manipulate the state in the click event. I was able to do this with class components as follows:
import React from "react";
import ReactDOM from "react-dom";
import Modal from "react-bootstrap/Modal";
import Button from "react-bootstrap/Button";
import ButtonToolbar from "react-bootstrap/ButtonToolbar";
import * as d3 from "d3";
import "./styles.css";
class App extends React.Component {
constructor(...args) {
super(...args);
let _color = "#" + Math.floor(Math.random() * 16777215).toString(16);
this.state = { modalShow: false, color: _color, showChart: false };
}
chart = React.createRef();
componentDidUpdate() {
if (this.state.modalShow) {
this.renderChart();
}
}
renderChart() {
let svg = d3
.select(this.chart.current)
.append("svg")
.attr("width", 200)
.attr("height", 200);
svg
.append("circle")
.attr("cx", 100)
.attr("cy", 100)
.attr("r", 50)
.attr("stroke", "black")
.attr("fill", this.state.color);
}
changeChartState() {
let _color = "#" + Math.floor(Math.random() * 16777215).toString(16);
this.setState({ color: _color });
}
showD3 = () => {
this.setState({ modalShow: true });
this.changeChartState();
};
render() {
let modalClose = () => this.setState({ modalShow: false });
return (
<>
<ButtonToolbar>
<Button variant="primary" onClick={this.showD3}>
Launch vertically centered modal
</Button>
</ButtonToolbar>
<Modal show={this.state.modalShow} onHide={modalClose}>
<Modal.Header closeButton>
<Modal.Title>Modal heading</Modal.Title>
</Modal.Header>
<Modal.Body>
D3 in React
<div ref={this.chart}></div>
</Modal.Body>
</Modal>
</>
);
}
}
const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);
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