d3.js node.path()用法及代碼示例

d3.js中的node.path()函數用於返回源節點和目標節點之間的最短路徑。

用法:

node.path(target);

參數：此函數接受上麵給定並在下麵描述的單個參數：

target:此參數接受目標節點。

返回值：該函數返回一個數組。

下麵給出的是上麵給出的函數的一些例子。

範例1：從根節點到任何其他節點的路徑。

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 = { 
            name:"rootNode", 
            children:[ 
                { 
                    name:"child1" 
                }, 
                { 
                    name:"child2", 
                    children:[ 
                        { 
                            name:"grandchild1", 
                            children:[ 
                                { name:"grand granchild1" }, 
                                { name:"grand granchild2" } 
                            ] 
                        }, 
                    ] 
                }, 
                { 
                    name:"child3", 
                    children:[ 
                        { name:"grandchild2" }, 
                        { name:"grandchild3" }, 
                        { name:"grandchild4" }, 
                        { name:"grandchild5" } 
                    ] 
                } 
            ] 
        }; 
  
        var obj = d3.hierarchy(tree); 
  
        // Printing path from rootnode 
        // to grand granchild1 
        console.log(obj.path(obj.children[1]. 
            children[0].children[0])); 
  
        console.log("Printing path from rootnode"  
                + "to grand granchild1:"); 
  
        let path = obj.path(obj.children[1] 
                .children[0].children[0]); 
  
        console.log(path[0].data.name + "->"  
                + path[1].data.name + "->" 
                + path[2].data.name + "->"  
                + path[3].data.name);         
    </script> 
</body> 
  
</html>

輸出：

範例2：以下代碼演示了從任何節點到任何其他節點的路徑。

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 = { 
            name:"rootNode", 
            children:[ 
                { 
                    name:"child1" 
                }, 
                { 
                    name:"child2", 
                    children:[ 
                        { 
                            name:"grandchild1", 
                            children:[ 
                                { name:"grand granchild1" }, 
                                { name:"grand granchild2" } 
                            ] 
                        }, 
                    ] 
                }, 
                { 
                    name:"child3", 
                    children:[ 
                        { name:"grandchild2" }, 
                        { name:"grandchild3" }, 
                        { name:"grandchild4" }, 
                        { name:"grandchild5" } 
                    ] 
                } 
            ] 
        }; 
  
        var obj = d3.hierarchy(tree); 
  
        // Printing path from any node to 
        // any other node 
        var grandchild3 = obj.children[2].children[1]; 
        var child2 = obj.children[1]; 
        console.log(grandchild3.path(child2)); 
  
        console.log("Printing path from anynode to"  
                + " any other node "); 
        let path = grandchild3.path(child2); 
  
        console.log(path[0].data.name + "->"  
                + path[1].data.name + "->" 
                + path[2].data.name + "->"  
                + path[3].data.name); 
    </script> 
</body> 
  
</html>

輸出：

相關用法

注：本文由純淨天空篩選整理自tarun007大神的英文原創作品 D3.js node.path() Function。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。