单击图表元素时如何重定向用户

Question

I am using react-chartJs-2 library to display the charts. Suppose, user clicks on the bar/Doughnut chart section he must be redirected to a specific page. Following is the code I have done for DoughnutChart:

1. ChartDisplay.jsx

<div className="DonutChartSection" >
   <Doughnut labelArray = {this.state.labelArr} DataArray = {this.state.DoughnutDataArr} colorArray = {this.state.DoughnutColorArr} title={"Employees"} />
</div>

2. Doughnut.jsx

    import React from 'react'; import {Doughnut} from 'react-chartjs-2'; Chart.defaults.global.defaultFontStyle = 'Bold'; Chart.defaults.global.defaultLegendPosition = 'left'; export default class DoughnutChartView extends React.Component{ constructor(props) {     super(props);     this.state = { }; } render() { let data = { labels: this.props.labelArray, datasets: [{ data: this.props.DataArray, backgroundColor: this.props.colorArray, hoverBackgroundColor: this.props.colorArray, }] } return ( <div> <span className="titleName" >{this.props.title}</span> <Doughnut data={data} /> </div> ); } };

I went through the github page and found the following event which can be used for click event but can't figure out how can I use it in my code.

https://github.com/jerairrest/react-chartjs-2#onelementsclick--getelementsatevent-function

Answer 1

Indeed, you actually answered your question already: onElementsClick can be used to execute an action when user clicks on an element of the chart. onElementsClick is a prop of the chart itself, so:

<Doughnut data={data} onElementsClick={elems => {
    // if required to build the URL, you can 
    // get datasetIndex and value index from an `elem`:
    console.log(elems[0]._datasetIndex + ', ' + elems[0]._index);
    // and then redirect to the target page:
    window.location = "https://example.com";
}} />

Note that elems may include more than one element, for example in case of a stacked bar chart (in which case it includes all elements of a bar clicked).

Answer 2

here is a actually quick solution for clicking on a pie Chart

import { Pie } from 'react-chartjs-2'
        <Pie
            getElementAtEvent={(data) => {
                if(data.length >= 1){
                    const dataItem: any  = data[0]
                    const index = dataItem.index
                    const foundLabel = props.labels[index]
                    // redirect or do stuff
                }
            }}