d3.js node.eachAfter()用法及代码示例

node.eachAfter()函数用于为每个节点调用一个特定的函数，但顺序为post-order-traversal。它以post-traversal的顺序访问每个节点，并对该特定节点及其每个后代执行操作。

用法:

node.eachAfter(function);

参数：该函数接受如上所述和以下描述的单个参数：

function:这是要为每个节点调用的函数。

返回值：此函数不返回任何内容。

范例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>

输出：

范例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>

输出：

相关用法

注：本文由纯净天空筛选整理自tarun007大神的英文原创作品 D3.js node.eachAfter() Function。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。