我正在尝试获取范围对象内的所有 DOM 节点,最好的方法是什么?
var selection = window.getSelection(); //what the user has selected
var range = selection.getRangeAt(0); //the first range of the selection
var startNode = range.startContainer;
var endNode = range.endContainer;
var allNodes = /*insert magic*/;
在过去的几个小时里我一直在思考一种方法,并想出了这个:
var getNextNode = function(node, skipChildren){
//if there are child nodes and we didn't come from a child node
if (node.firstChild && !skipChildren) {
return node.firstChild;
}
if (!node.parentNode){
return null;
}
return node.nextSibling
|| getNextNode(node.parentNode, true);
};
var getNodesInRange = function(range){
var startNode = range.startContainer.childNodes[range.startOffset]
|| range.startContainer;//it's a text node
var endNode = range.endContainer.childNodes[range.endOffset]
|| range.endContainer;
if (startNode == endNode && startNode.childNodes.length === 0) {
return [startNode];
};
var nodes = [];
do {
nodes.push(startNode);
}
while ((startNode = getNextNode(startNode))
&& (startNode != endNode));
return nodes;
};
但是,当结束节点是开始节点的父节点时,它会返回页面上的所有内容。我确定我忽略了一些显而易见的事情?或者也许是以完全错误的方式去做的。
MDC/DOM/范围 https://developer.mozilla.org/en/DOM/range
这是我为解决这个问题而提出的一个实现:
function getNextNode(node)
{
if (node.firstChild)
return node.firstChild;
while (node)
{
if (node.nextSibling)
return node.nextSibling;
node = node.parentNode;
}
}
function getNodesInRange(range)
{
var start = range.startContainer;
var end = range.endContainer;
var commonAncestor = range.commonAncestorContainer;
var nodes = [];
var node;
// walk parent nodes from start to common ancestor
for (node = start.parentNode; node; node = node.parentNode)
{
nodes.push(node);
if (node == commonAncestor)
break;
}
nodes.reverse();
// walk children and siblings from start until end is found
for (node = start; node; node = getNextNode(node))
{
nodes.push(node);
if (node == end)
break;
}
return nodes;
}
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