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descendant-sel.html
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descendant-sel.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
<head>
<meta http-equiv="Content-type" content="text/html;charset=UTF-8">
<link rel="Index" href="../">
<title>Toggle Class To Trigger Descendant Selector Rules</title>
<style type="text/css">
/* Make table pretty */
table {
border: 1px solid #8893af;
background: #dfe3ff;
width: 33em;
font-family: verdana, sans-serif;
margin: 12px;
}
tr {
background: #eef6ff;
}
td {
padding: 4px;
}
/* The descendant selector trick */
.even .odd-row, .odd tr {
display: none;
}
.odd .odd-row {
display: block;
display: table-row;
}
.odd-row {
background: #fdfeff;
}
</style>
<script type="text/javascript">
function showEven() {
var testTable = document.getElementById("testTable");
testTable.className = "even";
}
function showOdd() {
var testTable = document.getElementById("testTable");
testTable.className = "odd";
}
function showAll() {
var testTable = document.getElementById("testTable");
testTable.className = "";
}
</script>
</head>
<body>
<h1>Toggle Class To Trigger Descendant Selector Rules</h1>
<h2>Description</h2>
<p>
By toggling a class name on the table, the descendant selector is applied and certain rows are shown
and hidden.
</p>
<h2>Demonstration</h2>
<div>
<button onclick="showEven()">showEven()</button>
<button onclick="showOdd()">showOdd()</button>
<button onclick="showAll()">showAll()</button>
</div>
<table id="testTable">
<tr>
<td>even row, even row, even row, even row, even row, even row</td>
</tr>
<tr class="odd-row">
<td>odd row, odd row, odd row, odd row, odd row, odd row</td>
</tr>
<tr>
<td>even row, even row, even row, even row, even row, even row</td>
</tr>
<tr class="odd-row">
<td>odd row, odd row, odd row, odd row, odd row, odd row</td>
</tr>
<tr>
<td>even row, even row, even row, even row, even row, even row</td>
</tr>
<tr class="odd-row">
<td>odd row, odd row, odd row, odd row, odd row, odd row</td>
</tr>
<tr>
<td>even row, even row, even row, even row, even row, even row</td>
</tr>
<tr class="odd-row">
<td>odd row, odd row, odd row, odd row, odd row, odd row</td>
</tr>
</table>
</body>
</html>