效果如下图所示：
<!DOCTYPE html>
<html>
<head>
<title>Expanding/collapsing cells</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=edge"/>
<link rel="stylesheet" type="text/css" href="../../../codebase/dhtmlx.css"/>
<script src="../../../codebase/dhtmlx.js"></script>
<style>
div#layoutObj {
position: relative;
margin-top: 20px;
margin-left: 20px;
600px;
height: 400px;
}
</style>
<script>
var myLayout;
var sel;
function doOnLoad() {
myLayout = new dhtmlXLayoutObject({
parent: "layoutObj",
pattern: "3L"
});
sel = document.getElementById("sel");
myLayout.forEachItem(function(item){sel.options.add(new Option(item.getId(),item.getId()));});
}
function getId() {
var sel = document.getElementById("sel");
var id = sel.options[sel.selectedIndex].value;
return id;
}
function expand() {
myLayout.cells(getId()).expand();
}
function collapse() {
myLayout.cells(getId()).collapse();
}
</script>
</head>
<body onload="doOnLoad();">
<div id="layoutObj"></div>
<div style="position: relative; margin-top: 40px; margin-left: 20px;">
Item: <select id="sel"></select>
<input type="button" value="Expand" onclick="expand();">
<input type="button" value="Collapse" onclick="collapse();">
</div>
</body>
</html>