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<!doctype html>
<html>
<head>
<title>vscroll table demo</title>
<meta charset="utf-8">
<style>
#viewport {
height: 350px;
width: 300px;
overflow-y: scroll;
}
table {
border-collapse: collapse;
width: 100%;
}
th {
background: #f0f0f0;
position: sticky;
text-align: left;
top: 0;
padding: 5px;
}
th:first-child {
width: 50px;
}
td {
padding: 2px;
}
.num {
font-size: smaller;
}
</style>
<script src="https://cdn.jsdelivr.net/npm/vscroll/dist/bundles/vscroll.umd.js"></script>
</head>
<body>
<h3>VScroll Table Demo (CDN)</h3>
<div id="viewport">
<table>
<thead>
<tr>
<th>Num</th>
<th>Text</th>
</tr>
</thead>
<tbody id="vscroll">
<tr data-padding-backward>
<td colspan="2"></td>
</tr>
<!-- vscroll rows -->
<tr data-padding-forward>
<td colspan="2"></td>
</tr>
</tbody>
</table>
</div>
<script>
(() => {
const Datasource = VScroll.makeDatasource();
// datasource, generates items in runtime
const datasource = new Datasource({
get: (index, count, success) => {
const data = [];
for (let i = index; i <= index + count - 1; i++) {
data.push({ id: i, text: 'item #' + i });
}
success(data);
},
settings: {
minIndex: 1,
viewportElement: () => document.getElementById('viewport'),
},
});
const workflowParams = {
consumer: {
name: 'VScroll Table Demo (CDN)',
version: 'not published',
},
element: document.getElementById('vscroll'),
datasource,
run: (newItems) => {
if (!newItems.length && !oldItems.length) {
return;
}
processItems(newItems, oldItems);
oldItems = newItems;
},
// DOM routines override, to provide table-header offset
Routines: class extends VScroll.Routines {
getOffset() {
return document.querySelector('#viewport thead')?.offsetHeight || 0;
}
},
};
// old items storage
let oldItems = [];
// renderer, detects change and provides consistent view
const processItems = (newItems, oldItems) => {
// remove elements not present
oldItems
.filter((item) => !newItems.includes(item))
.forEach((item) => item.element.remove());
// create and insert new elements
const elements = [];
let beforeElement = workflowParams.element.querySelector(
'[data-padding-forward]'
);
for (let i = newItems.length - 1; i >= 0; i--) {
if (oldItems.includes(newItems[i])) {
if (!elements.length) {
beforeElement = newItems[i].element;
continue;
} else {
break;
}
}
elements.unshift(createItemElement(newItems[i]));
}
elements.forEach((elt) =>
beforeElement.insertAdjacentElement('beforebegin', elt)
);
};
// creates and returns single item HTML element
const createItemElement = (item) => {
const element = document.createElement('tr');
element.setAttribute('data-sid', item.nodeId);
if (item.invisible) {
element.style.position = 'fixed';
element.style.top = '-99px';
}
element.innerHTML = `<td class="num">${item.$index}</td><td>${item.data.text}</td>`;
return element;
};
// run the VScroll Workflow
new VScroll.Workflow(workflowParams);
})();
</script>
</body>
</html>