D3.js node.depth Property

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The D3.js node.depth property returns the length of the path from the node up to the root.

Syntax:

node.depth

Return Value: This property returns the length of the path from the node up to the root.

Example 1:

HTML

<!DOCTYPE html> 
<html> 
<head> 
    <meta charset="utf-8"> 
  
    <script src= 
        "https://d3js.org/d3.v5.min.js"> 
    </script> 
</head> 
  
<body> 
    <script> 
        var data = { 
            "name":"zambiatek",  
            "about":"Computer Science Portal", 
            "children":[ 
                {"name":"GFG1"}, 
                {"name":"GFG2"}, 
                {"name":"GFG3"}, 
                {"name":"GFG4"} 
            ] 
        } 
        var root = d3.hierarchy(data); 
        console.log(root.children[0].depth); 
    </script> 
</body> 
  
</html>

Output:

Example 2: In this example, this method returns undefined as the root node has no child node.

HTML

<!DOCTYPE html> 
<html> 
<head> 
    <meta charset="utf-8"> 
  
    <script src= 
        "https://d3js.org/d3.v5.min.js"> 
    </script> 
</head> 
  
<body> 
    <script> 
        var data = {"name":"GFG1"} 
  
        var root = d3.hierarchy(data); 
  
        console.log(root.depth); 
    </script> 
</body> 
  
</html>

Output:

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