Demos
Input(React)
ComboBox
Objects
Overview

ComboBox with Objects (React)

The ComboBox can be bound to an object array, but to display the right item in the object, you should set the displayMemberPath to the name of the property to display in the ComboBox's drop down. This sample displays the values for the selectedIndex, selectedValue, or text properties based on the selected object as user changes selection.

This example uses React.

JavaScript
Angular
Vue
React
app.jsx
index.html
app.css
data.jsx
Copy to CodeMine
import 'bootstrap.css';
import '@mescius/wijmo.styles/wijmo.css';
import ReactDOM from 'react-dom/client';
import React, { useState } from 'react';
import useEvent from 'react-use-event-hook';
import * as wijmo from '@mescius/wijmo';
import * as wjInput from '@mescius/wijmo.react.input';
import './app.css';
import { data } from './data';
function App() {
    const [text, setText] = useState(null);
    const [index, setIndex] = useState(null);
    const [value, setValue] = useState(null);
    const initCombo = useEvent((sender) => {
        setText(sender.text);
        setIndex(sender.selectedIndex);
        setValue(sender.selectedValue);
    });
    const formatCurrency = (number) => {
        return wijmo.Globalize.format(number, 'c');
    };
    const onSelectedIndexChanged = useEvent((sender) => {
        setText(sender.text);
        setIndex(sender.selectedIndex);
        setValue(sender.selectedValue);
    });
    return (<div className="container-fluid">
      <div className="form-group">
        <label htmlFor="theCombo">Select an item:</label>
        <wjInput.ComboBox id="theCombo" displayMemberPath="country" selectedValuePath="sales" itemsSource={data} initialized={initCombo} selectedIndexChanged={onSelectedIndexChanged}>
        </wjInput.ComboBox>
      </div>
      <p>
        The current text is: <b>{text}</b>.
      </p>
      <p>
        The selectedIndex is: <b>{index}</b>.
      </p>
      <p>
        The selectedValue is: <b>{formatCurrency(value)}</b>.
      </p>
    </div>);
}
const container = document.getElementById('app');
if (container) {
    const root = ReactDOM.createRoot(container);
    root.render(<App />);
}
import 'bootstrap.css'; import '@mescius/wijmo.styles/wijmo.css'; import ReactDOM from 'react-dom/client'; import React, { useState } from 'react'; import useEvent from 'react-use-event-hook'; import * as wijmo from '@mescius/wijmo'; import * as wjInput from '@mescius/wijmo.react.input'; import './app.css'; import { data } from './data'; function App() { const [text, setText] = useState(null); const [index, setIndex] = useState(null); const [value, setValue] = useState(null); const initCombo = useEvent((sender) => { setText(sender.text); setIndex(sender.selectedIndex); setValue(sender.selectedValue); }); const formatCurrency = (number) => { return wijmo.Globalize.format(number, 'c'); }; const onSelectedIndexChanged = useEvent((sender) => { setText(sender.text); setIndex(sender.selectedIndex); setValue(sender.selectedValue); }); return (<div className="container-fluid"> <div className="form-group"> <label htmlFor="theCombo">Select an item:</label> <wjInput.ComboBox id="theCombo" displayMemberPath="country" selectedValuePath="sales" itemsSource={data} initialized={initCombo} selectedIndexChanged={onSelectedIndexChanged}> </wjInput.ComboBox> </div> <p> The current text is: <b>{text}</b>. </p> <p> The selectedIndex is: <b>{index}</b>. </p> <p> The selectedValue is: <b>{formatCurrency(value)}</b>. </p> </div>); } const container = document.getElementById('app'); if (container) { const root = ReactDOM.createRoot(container); root.render(<App />); }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>MESCIUS Wijmo ComboBox with Objects</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- SystemJS --> <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.40/system.src.js" integrity="sha512-G6mEj6h18+m3MvzdviSDfPle/TfH0//cXcB33AKlNR/Rha0yQsKefDZKRTkIZos97HEGq2JMV1RT5ybMoQ3WsQ==" crossorigin="anonymous"></script> <script src="systemjs.config.js"></script> <script> System.import('./src/app'); </script> </head> <body> <div id="app"></div> </body> </html>
label { margin-right: 3px; }
function getData() { // create some random data let countries = ['China', 'Germany', 'Greece', 'Italy', 'Japan', 'Portugal', 'Russia', 'Spain', 'UK', 'US'], data = []; // for (let i = 0; i < countries.length; i++) { data.push({ country: countries[i], active: i % 5 != 0, sales: Math.random() * 100000, expenses: Math.random() * 50000 }); } // return data; } export const data = getData();
(function (global) { window.process = { env: { NODE_ENV: "production" } } System.config({ transpiler: 'plugin-babel', babelOptions: { es2015: true, react: true }, meta: { '*.css': { loader: 'css' } }, paths: { // paths serve as alias 'npm:': 'node_modules/' }, // map tells the System loader where to look for things map: { 'jszip': 'npm:jszip/dist/jszip.js', '@mescius/wijmo': 'npm:@mescius/wijmo/index.js', '@mescius/wijmo.input': 'npm:@mescius/wijmo.input/index.js', '@mescius/wijmo.styles': 'npm:@mescius/wijmo.styles', '@mescius/wijmo.cultures': 'npm:@mescius/wijmo.cultures', '@mescius/wijmo.chart': 'npm:@mescius/wijmo.chart/index.js', '@mescius/wijmo.chart.analytics': 'npm:@mescius/wijmo.chart.analytics/index.js', '@mescius/wijmo.chart.animation': 'npm:@mescius/wijmo.chart.animation/index.js', '@mescius/wijmo.chart.annotation': 'npm:@mescius/wijmo.chart.annotation/index.js', '@mescius/wijmo.chart.finance': 'npm:@mescius/wijmo.chart.finance/index.js', 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'systemjs-babel-build':'npm:systemjs-plugin-babel/systemjs-babel-browser.js', "react-use-event-hook": "npm:react-use-event-hook/dist/esm/useEvent.js", }, // packages tells the System loader how to load when no filename and/or no extension packages: { src: { defaultExtension: 'jsx' }, "node_modules": { defaultExtension: 'js' }, } }); })(this);