getTextNodeList.js : 対象のDOMノード及び子孫ノードからテキストノードを抽出して配列を返す

getTextNodeList.js

/**
 * getTextNodeList.js
 *
 * @version 1.1.7
 * @author think49
 * @url https://gist.github.com/658424
 */

var getTextNodeList = (function () {

  // define DOM Interface Object "Node" (for IE)
  var Node = (typeof Node === 'function' || typeof Node === 'object' && Node) ? Node : (function () {
    function Node () { ; }

    // define Function#name
    if (!('name' in Node)) {
      Node.name = 'Node';
    }

    // define nodeType literal
    Node.ELEMENT_NODE = 1;
    Node.ATTRIBUTE_NODE = 2;
    Node.TEXT_NODE = 3;
    Node.CDATA_SECTION_NODE = 4;
    Node.ENTITY_REFERENCE_NODE = 5;
    Node.ENTITY_NODE = 6;
    Node.PROCESSING_INSTRUCTION_NODE = 7;
    Node.COMMENT_NODE = 8;
    Node.DOCUMENT_NODE = 9;
    Node.DOCUMENT_TYPE_NODE = 10;
    Node.DOCUMENT_FRAGMENT_NODE = 11;

    // define Function#toString
    Node.toString = function () { return 'function Node() { [custom code] }'; };

    return Node;
  })();


  function getTextNodeList (contextNode) {
    var ELEMENT_NODE, DOCUMENT_NODE, DOCUMENT_FRAGMENT_NODE, TEXT_NODE, textNodeList, targetNode, i, l;

    if (typeof contextNode !== 'object') {
      throw new TypeError(contextNode + ' is not a object');
    }

    ELEMENT_NODE = Node.ELEMENT_NODE;
    DOCUMENT_NODE = Node.DOCUMENT_NODE;
    DOCUMENT_FRAGMENT_NODE = Node.DOCUMENT_FRAGMENT_NODE;
    TEXT_NODE = Node.TEXT_NODE;
    textNodeList = [];

    if ('length' in contextNode && 'item' in contextNode) {

      for (i = 0, l = contextNode.length; i < l; i++) {
        targetNode = contextNode[i];

        switch (targetNode.nodeType) {
          case ELEMENT_NODE:
          case DOCUMENT_NODE:
          case DOCUMENT_FRAGMENT_NODE:
            textNodeList = textNodeList.concat(getTextNodeList(targetNode.childNodes));
            break;
          case TEXT_NODE:
            textNodeList.push(targetNode);
            break;
        }
      }

    } else {

      switch (contextNode.nodeType) {
        case ELEMENT_NODE:
        case DOCUMENT_NODE:
        case DOCUMENT_FRAGMENT_NODE:
          textNodeList = textNodeList.concat(getTextNodeList(contextNode.childNodes));
          break;
        case TEXT_NODE:
          textNodeList.push(contextNode);
          break;
      }
    }

    return textNodeList;
  }

  return getTextNodeList;
})();

下記URLで解説しています。

getTextNodeList.js
http://vird2002.s8.xrea.com/javascript/getTextNodeList.html

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U D ◆TPP2IbCBBq さんにアドバイスをいただきました。

掲示板/JavaScript質問板/document.body の子孫テキストノードを配列で取得 - TAG index Webサイト
http://www.tagindex.com/cgi-lib/q4bbs/patio.cgi?mode=view&no=2724