如何生成一个完全由DOM元素及其所有后代组成的d3选择？

问题描述

假设 X 是一些任意的DOM元素。如何生成包含 X 及其所有后代的d3.js选择？

Suppose that X is some arbitrary DOM element. How can I generate a d3.js selection containing exactly X and all its descendants?

（注意 d3.select（X）.selectAll（'*'）给出的选择将包含 X ，但不会包含 X 本身。）

(Note that the selection given by d3.select(X).selectAll('*') will contain all the descendants of X, but it will not contain X itself.)

对于这个问题， X 的唯一约束是表达式 d3.select （X）评估为有效的d3.js选择。

For this question, the only constraint on X is that the expression d3.select(X) evaluate to a valid d3.js selection.

推荐答案

a href =https://github.com/mbostock/d3/wiki/Selections#d3_selectAll =nofollow> d3.selectAll（nodes） 接受数组式对象作为参数，您可以，将其转换为数组并将您的节点x添加到它。将此数组传递到 d3.selectAll（）将返回包含节点x及其所有后代的所需选择。

Since d3.selectAll(nodes) accepts an array-like object as a parameter you could obtain a NodeList of all descendants of your node x, convert it to an array and add your node x to it. Passing this array to d3.selectAll() will return the desired selection containing node x as well as all its descendants.

检查此操作：

var x = d3.select("#a_2").node(); // your node

// Get all children of node x as NodeList and convert to Array.
var xAndDescendants = Array.prototype.slice.call(  
        x.querySelectorAll("*")
    );  

// Add node x to the beginning
xAndDescendants.unshift(x);

// Select resulting array via d3.js
var selection = d3.selectAll(xAndDescendants);

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