リストコントロールでは、リストアイテムに表示するデータを動的に読み込む（ロードオンデマンド）ことが可能です。
概要
loadプロパティを使用することで、リストアイテムがロードされるときに実行する処理を設定することができます。また、pageSizeプロパティを使用することで、ロードオンデマンドでデータを表示する場合に、一度に読み込むアイテムの数を設定することが可能です。
以下のサンプルコードでは、ロードオンデマンドで一度に読み込むアイテムの数を「20」に設定しているので、リストアイテムを最後のアイテムまでスクロールさせると、２０個ずつリストアイテムが動的に追加されます。
import '@mescius/inputman/CSS/gc.inputman-js.css';
import { InputMan } from '@mescius/inputman';
import { loadData } from './data';
InputMan.appearanceStyle = InputMan.AppearanceStyle.Modern;
const gcListBox = new InputMan.GcListBox(document.getElementById('gcListBox'), {
width: 100,
virtualMode: true,
load: (context) => loadData(
{ pageNumber: context.pageNumber, pageSize: 20 },
(items) => context.success(items))
});
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>リストコントロール - 動的読み込み</title>
<!-- SystemJS -->
<script src="node_modules/systemjs/dist/system.src.js"></script>
<script src="systemjs.config.js"></script>
<script>
window.onload = function() {
System.import('./src/app');
}
</script>
</head>
<body>
<select id="gcListBox"></select>
</body>
</html>
export const loadData = (args, cb) => {
setTimeout(() => {
var items = generateItems(args);
cb(items);
}, 500)
}
const generateItems = (args) => {
var items = [];
for (var i = 0; i < args.pageSize; i++) {
items.push('項目' + (args.pageNumber * args.pageSize + i));
}
return items;
}
System.config({
transpiler: 'plugin-babel',
babelOptions: {
es2015: true
},
meta: {
'*.css': { loader: 'css' }
},
paths: {
// paths serve as alias
'npm:': 'node_modules/'
},
// map tells the System loader where to look for things
map: {
'@mescius/inputman': 'npm:@mescius/inputman/index.js',
'@mescius/inputman/CSS': 'npm:@mescius/inputman/CSS',
'@mescius/inputman.richtexteditor': 'npm:@mescius/inputman.richtexteditor/index.js',
"@mescius/inputman.richtexteditor/CSS": "npm:@mescius/inputman.richtexteditor/CSS",
'@mescius/inputman.richtexteditor/JS/plugins/advlist': 'npm:@mescius/inputman.richtexteditor/JS/plugins/advlist/plugin.js',
'@mescius/inputman.richtexteditor/JS/plugins/all': 'npm:@mescius/inputman.richtexteditor/JS/plugins/all/plugin.js',
'@mescius/inputman.richtexteditor/JS/plugins/autosave': 'npm:@mescius/inputman.richtexteditor/JS/plugins/autosave/plugin.js',
'@mescius/inputman.richtexteditor/JS/plugins/charmap': 'npm:@mescius/inputman.richtexteditor/JS/plugins/charmap/plugin.js',
'@mescius/inputman.richtexteditor/JS/plugins/directionality': 'npm:@mescius/inputman.richtexteditor/JS/plugins/directionality/plugin.js',
'@mescius/inputman.richtexteditor/JS/plugins/emoticons': 'npm:@mescius/inputman.richtexteditor/JS/plugins/emoticons/plugin.js',
'@mescius/inputman.richtexteditor/JS/plugins/fullscreen': 'npm:@mescius/inputman.richtexteditor/JS/plugins/fullscreen/plugin.js',
'@mescius/inputman.richtexteditor/JS/plugins/htmlcode': 'npm:@mescius/inputman.richtexteditor/JS/plugins/htmlcode/plugin.js',
'@mescius/inputman.richtexteditor/JS/plugins/image': 'npm:@mescius/inputman.richtexteditor/JS/plugins/image/plugin.js',
'@mescius/inputman.richtexteditor/JS/plugins/link': 'npm:@mescius/inputman.richtexteditor/JS/plugins/link/plugin.js',
'@mescius/inputman.richtexteditor/JS/plugins/lists': 'npm:@mescius/inputman.richtexteditor/JS/plugins/lists/plugin.js',
'@mescius/inputman.richtexteditor/JS/plugins/media': 'npm:@mescius/inputman.richtexteditor/JS/plugins/media/plugin.js',
'@mescius/inputman.richtexteditor/JS/plugins/pagebreak': 'npm:@mescius/inputman.richtexteditor/JS/plugins/pagebreak/plugin.js',
'@mescius/inputman.richtexteditor/JS/plugins/preview': 'npm:@mescius/inputman.richtexteditor/JS/plugins/preview/plugin.js',
'@mescius/inputman.richtexteditor/JS/plugins/save': 'npm:@mescius/inputman.richtexteditor/JS/plugins/save/plugin.js',
'@mescius/inputman.richtexteditor/JS/plugins/searchreplace': 'npm:@mescius/inputman.richtexteditor/JS/plugins/searchreplace/plugin.js',
'@mescius/inputman.richtexteditor/JS/plugins/table': 'npm:@mescius/inputman.richtexteditor/JS/plugins/table/plugin.js',
'@mescius/inputman.richtexteditor/JS/plugins/template': 'npm:@mescius/inputman.richtexteditor/JS/plugins/template/plugin.js',
'@mescius/inputman.richtexteditor/JS/plugins/wordcount': 'npm:@mescius/inputman.richtexteditor/JS/plugins/wordcount/plugin.js',
'@mescius/inputman.comment': 'npm:@mescius/inputman.comment/index.js',
'@mescius/inputman.comment/CSS': 'npm:@mescius/inputman.comment/CSS',
'@mescius/wijmo': 'npm:@mescius/wijmo/index.js',
'@mescius/wijmo.styles': 'npm:@mescius/wijmo.styles',
'@mescius/wijmo.cultures': 'npm:@mescius/wijmo.cultures',
'@mescius/wijmo.input': 'npm:@mescius/wijmo.input/index.js',
'@mescius/wijmo.grid': 'npm:@mescius/wijmo.grid/index.js',
'@mescius/wijmo.nav': 'npm:@mescius/wijmo.nav/index.js',
'@mescius/spread-sheets': 'npm:@mescius/spread-sheets/index.js',
'@mescius/spread-sheets-resources-ja': 'npm:@mescius/spread-sheets-resources-ja/index.js',
'@mescius/spread-sheets/styles': 'npm:@mescius/spread-sheets/styles',
'css': 'npm:systemjs-plugin-css/css.js',
'plugin-babel': 'npm:systemjs-plugin-babel/plugin-babel.js',
'systemjs-babel-build': 'npm:systemjs-plugin-babel/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'
},
}
});
