The d3.hierarchy() function in D3.js library is used to construct a root node data from a given hierarchical data. The data that is given must be of an object and must represent a root node.
Syntax:
d3.hierarchy(data[, children]);
Parameters: This function takes a single parameter as given above and described below.
- data: This parameter is an object of representing hierarchical data.
Return Value: This function return an object.
Below given are a few examples of the function given above.
Example 1:
HTML
<!DOCTYPE html> <html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" path1tent=
"width=device-width, initial-scale = 1.0"/>
</script>
</head>
<body>
<script>
var obj = d3.hierarchy({
name: "rootNode",
children: [
{
name: "child1"
},
{
name: "child2",
children: [
{ name: "grandChild1" },
{ name: "grandChild2" },
{ name: "grandChild3" },
{ name: "grandChild4" }
]
},
{
name: "child3",
children: [
{ name: "grandChild5" },
{ name: "grandChild6" },
]
}
]
});
console.log(obj);
</script>
</body>
</html>
|
Output:
Example 2:
HTML
<!DOCTYPE html> <html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" path1tent=
"width=device-width, initial-scale = 1.0"/>
</script>
</head>
<body>
<script>
var obj = d3.hierarchy({
name: "rootNode",
children: [
{
name: "child1"
},
{
name: "child2",
children: [
{ name: "grandChild1" },
]
}
]
});
console.log(obj);
console.log(obj.data);
console.log(obj.data.children[0]);
</script>
</body>
</html>
|
Output: