import 'bootstrap.css';
import '@mescius/wijmo.styles/wijmo.css';
import './styles.css';
//
import * as wjInput from '@mescius/wijmo.input';
import { getData } from './data';
//
document.readyState === 'complete' ? init() : window.onload = init;
//
function init() {
// the ListBox
let theListBox = new wjInput.ListBox('#theListBox', {
itemsSource: getData()
});
//
// add elements when the user scrolls to the bottom of the list
theListBox.hostElement.addEventListener('scroll', e => {
let el = e.target;
//
// near the bottom?
if (el.scrollTop + el.clientHeight > el.scrollHeight - 20) {
//
// add five elements to the list
let arr = theListBox.itemsSource;
for (let i = 0; i < 5; i++) {
arr.push('item ' + arr.length);
}
//
// refresh the list and keep the scroll top
let top = el.scrollTop;
theListBox.collectionView.refresh();
el.scrollTop = top;
//
// show how many items we have
let cnt = document.querySelector('#count');
cnt.textContent = `The list now has ${arr.length} items.`;
}
});
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>MESCIUS Wijmo Infinite ListBox</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- SystemJS -->
<script src="https://cdn.jsdelivr.net/npm/systemjs@0.21.5/dist/system.src.js" integrity="sha512-skZbMyvYdNoZfLmiGn5ii6KmklM82rYX2uWctBhzaXPxJgiv4XBwJnFGr5k8s+6tE1pcR1nuTKghozJHyzMcoA==" crossorigin="anonymous"></script>
<script src="systemjs.config.js"></script>
<script>
System.import('./src/app');
</script>
</head>
<body>
<main class="container-fluid">
<div id="theListBox"></div>
<p id="count">
</p>
</main>
</body>
</html>
// get some data
export function getData() {
let arr = [];
for (let i = 0; i < 20; i++) {
arr.push('item ' + i);
}
return arr;
}
.wj-listbox {
height: 200px;
width: 200px;
margin-left: 2em;
}
.wj-listbox-item {
line-height: 2.5em;
}
body {
margin-bottom: 24pt;
}
(function (global) {
System.config({
transpiler: 'plugin-babel',
babelOptions: {
es2015: true,
},
meta: {
'*.css': { loader: 'css' },
},
paths: {
// paths serve as alias
'npm:': 'node_modules/',
'cdn:': 'https://cdn.mescius.io/demoapps/packages/wijmojs/latest/',
'pcdn:': 'https://cdn.jsdelivr.net/npm/'
},
// map tells the System loader where to look for things
map: {
'@mescius/wijmo': 'cdn:@mescius/wijmo/index.js',
'@mescius/wijmo.input': 'cdn:@mescius/wijmo.input/index.js',
'@mescius/wijmo.styles': 'cdn:@mescius/wijmo.styles',
'@mescius/wijmo.cultures': 'cdn:@mescius/wijmo.cultures',
'@mescius/wijmo.chart': 'cdn:@mescius/wijmo.chart/index.js',
'@mescius/wijmo.chart.analytics': 'cdn:@mescius/wijmo.chart.analytics/index.js',
'@mescius/wijmo.chart.animation': 'cdn:@mescius/wijmo.chart.animation/index.js',
'@mescius/wijmo.chart.annotation': 'cdn:@mescius/wijmo.chart.annotation/index.js',
'@mescius/wijmo.chart.finance': 'cdn:@mescius/wijmo.chart.finance/index.js',
'@mescius/wijmo.chart.finance.analytics': 'cdn:@mescius/wijmo.chart.finance.analytics/index.js',
'@mescius/wijmo.chart.hierarchical': 'cdn:@mescius/wijmo.chart.hierarchical/index.js',
'@mescius/wijmo.chart.interaction': 'cdn:@mescius/wijmo.chart.interaction/index.js',
'@mescius/wijmo.chart.radar': 'cdn:@mescius/wijmo.chart.radar/index.js',
'@mescius/wijmo.chart.render': 'cdn:@mescius/wijmo.chart.render/index.js',
'@mescius/wijmo.chart.webgl': 'cdn:@mescius/wijmo.chart.webgl/index.js',
'@mescius/wijmo.chart.map': 'cdn:@mescius/wijmo.chart.map/index.js',
'@mescius/wijmo.gauge': 'cdn:@mescius/wijmo.gauge/index.js',
'@mescius/wijmo.grid': 'cdn:@mescius/wijmo.grid/index.js',
'@mescius/wijmo.grid.detail': 'cdn:@mescius/wijmo.grid.detail/index.js',
'@mescius/wijmo.grid.filter': 'cdn:@mescius/wijmo.grid.filter/index.js',
'@mescius/wijmo.grid.search': 'cdn:@mescius/wijmo.grid.search/index.js',
'@mescius/wijmo.grid.style': 'cdn:@mescius/wijmo.grid.style/index.js',
'@mescius/wijmo.grid.grouppanel': 'cdn:@mescius/wijmo.grid.grouppanel/index.js',
'@mescius/wijmo.grid.multirow': 'cdn:@mescius/wijmo.grid.multirow/index.js',
'@mescius/wijmo.grid.transposed': 'cdn:@mescius/wijmo.grid.transposed/index.js',
'@mescius/wijmo.grid.transposedmultirow': 'cdn:@mescius/wijmo.grid.transposedmultirow/index.js',
'@mescius/wijmo.grid.pdf': 'cdn:@mescius/wijmo.grid.pdf/index.js',
'@mescius/wijmo.grid.sheet': 'cdn:@mescius/wijmo.grid.sheet/index.js',
'@mescius/wijmo.grid.xlsx': 'cdn:@mescius/wijmo.grid.xlsx/index.js',
'@mescius/wijmo.grid.selector': 'cdn:@mescius/wijmo.grid.selector/index.js',
'@mescius/wijmo.grid.cellmaker': 'cdn:@mescius/wijmo.grid.cellmaker/index.js',
'@mescius/wijmo.nav': 'cdn:@mescius/wijmo.nav/index.js',
'@mescius/wijmo.odata': 'cdn:@mescius/wijmo.odata/index.js',
'@mescius/wijmo.olap': 'cdn:@mescius/wijmo.olap/index.js',
'@mescius/wijmo.rest': 'cdn:@mescius/wijmo.rest/index.js',
'@mescius/wijmo.pdf': 'cdn:@mescius/wijmo.pdf/index.js',
'@mescius/wijmo.pdf.security': 'cdn:@mescius/wijmo.pdf.security/index.js',
'@mescius/wijmo.viewer': 'cdn:@mescius/wijmo.viewer/index.js',
'@mescius/wijmo.xlsx': 'cdn:@mescius/wijmo.xlsx/index.js',
'@mescius/wijmo.undo': 'cdn:@mescius/wijmo.undo/index.js',
'@mescius/wijmo.interop.grid': 'cdn:@mescius/wijmo.interop.grid/index.js',
'@mescius/wijmo.touch': 'cdn:@mescius/wijmo.touch/index.js',
'@mescius/wijmo.cloud': 'cdn:@mescius/wijmo.cloud/index.js',
'@mescius/wijmo.barcode': 'cdn:@mescius/wijmo.barcode/index.js',
'@mescius/wijmo.barcode.common': 'cdn:@mescius/wijmo.barcode.common/index.js',
'@mescius/wijmo.barcode.composite': 'cdn:@mescius/wijmo.barcode.composite/index.js',
'@mescius/wijmo.barcode.specialized': 'cdn:@mescius/wijmo.barcode.specialized/index.js',
jszip: 'pcdn:jszip@3.8.0/dist/jszip.js',
'bootstrap.css': 'pcdn:bootstrap@3.3.7/dist/css/bootstrap.min.css',
css: 'pcdn:systemjs-plugin-css@0.1.37/css.js',
'plugin-babel': 'pcdn:systemjs-plugin-babel@0.0.25/plugin-babel.js',
'systemjs-babel-build': 'pcdn:systemjs-plugin-babel@0.0.25/systemjs-babel-browser.js',
},
// packages tells the System loader how to load when no filename and/or no extension
packages: {
src: {
defaultExtension: 'js',
},
node_modules: {
defaultExtension: 'js',
},
},
});
})(this);
