How can I find all text nodes between two element nodes with JavaScript/jQuery?

问题

Given the following HTML-Fragment:

<div>
  <p>
    abc <span id="x">[</span> def <br /> ghi
  </p>
  <p>
    <strong> jkl <span id="y">]</span> mno </strong>
  </p>
</div>

I need an algorithm to fetch all nodes of type Text between #x and #y with Javascript. Or is there a JQuery function that does exactly that?

The resulting Text nodes (whitespace nodes ignored) for the example above would then be:

['def', 'ghi', 'jkl']

回答1:

The following works in all major browsers using DOM methods and no library. It also ignores whitespace text nodes as mentioned in the question.

Obligatory jsfiddle: http://jsfiddle.net/timdown/a2Fm6/

function getTextNodesBetween(rootNode, startNode, endNode) {
    var pastStartNode = false, reachedEndNode = false, textNodes = [];

    function getTextNodes(node) {
        if (node == startNode) {
            pastStartNode = true;
        } else if (node == endNode) {
            reachedEndNode = true;
        } else if (node.nodeType == 3) {
            if (pastStartNode && !reachedEndNode && !/^\s*$/.test(node.nodeValue)) {
                textNodes.push(node);
            }
        } else {
            for (var i = 0, len = node.childNodes.length; !reachedEndNode && i < len; ++i) {
                getTextNodes(node.childNodes[i]);
            }
        }
    }

    getTextNodes(rootNode);
    return textNodes;
}

var x = document.getElementById("x"),
    y = document.getElementById("y");

var textNodes = getTextNodesBetween(document.body, x, y);
console.log(textNodes);

回答2:

The following example uses jQuery to find any two elements that are next to each other and may or may not have text nodes between them. This foreach loop will check the resulted elements to find any text nodes and add them to the list.

function getTextNodes() {
    var list = [];
    $(document.body).find("*+*").toArray().forEach(function (el) {
        var prev = el.previousSibling;
        while (prev != null && prev.nodeType == 3) {
            list.push(prev);
            prev = prev.previousSibling;
        }
    });
    return list;
}

来源：https://stackoverflow.com/questions/4398526/how-can-i-find-all-text-nodes-between-two-element-nodes-with-javascript-jquery

标签

javascript

jquery

traversal