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D3.js node.eachAfter() Function

Last Updated : 31 Aug, 2020
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The node.eachAfter() function is used to invoke a particular function for each node but in a post-order-traversal order. It visits each node in post-traversal order and performs an operation on that particular node and each of its descendants.

Syntax:

node.eachAfter(function);

Parameters: This function accepts a single parameter as mentioned above and described below:

  • function: This is the function that is to be invoked for each node.

Return Values: This function does not return anything.

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 src =
        "https://d3js.org/d3.v4.min.js">
    </script>
</head> 

<body> 
    <script> 
   // Constructing a tree
   var tree={
            // Root node
            name: "rootNode", 
            children: [
                {
                    // Child of root node
                    name: "child1", 
                    value: 2
                },
                {
                    // Child of root node
                    name: "child2", 
                    value: 3,
                    children: [
                        {
                            // Child of child2
                            name: "grandchild1", 
                            value: 1,
                            children:[
                                {   
                                    // Child of grandchild1
                                    name: "grand_granchild1_1",
                                    value: 4
                                }, 
                                {
                                    // Child of grandchild1
                                    name: "grand_granchild1_2",
                                    value: 5
                                }  
                            ]
                        },
                        {
                            name: "grandchild2",
                            children:[
                                {
                                    // Child of grandchild2
                                    name: "grand_granchild2_1"
                                },  
                                {
                                    // Child of grandchild2
                                    name: "grand_granchild2_2"
                                }  
                            ]
                        }
                    ]
                }
            ]
        };

        var obj = d3.hierarchy(tree);

        const BFS = [];

        obj.eachAfter(d => BFS.push
        (
            " ".repeat(d.depth) + `${d.depth}: ${d.data.name}`
        ));

        BFS.forEach((e)=>{
            console.log(e);
        })
    </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 src =
        "https://d3js.org/d3.v4.min.js">
    </script>
</head> 

<body> 
    <script>
        var obj = d3.hierarchy({
            // Root node
            name: "rootNode", 
            children: [
                {
                    // Child of root node
                    name: "child1", 
                    value: 2
                },
                {
                    // Child of root node
                    name: "child2", 
                    value: 3,
                    children: [
                        {
                            // Child of child2
                            name: "grandchild1", 
                            value: 1,
                            children:[
                                {
                                    // Child of grandchild1
                                    name: "grand_granchild1_1",
                                    value: 4
                                }, 
                                
                                {
                                    // Child of grandchild1
                                    name: "grand_granchild1_2",
                                    value: 5
                                }  
                            ]
                        }
                    ]
                }
            ]
        });

        const BFS = [];

        obj.eachAfter(d => BFS.push
        (
            " ".repeat(d.depth) + `${d.depth}: ${d.data.name}`
        ));
        
        console.log(BFS);
    </script> 
</body> 

</html>

Output:


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D3.js node.eachBefore() Function

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