選択範囲の文字列を取得するjs

create-range.js

// See: Introduction to Range
// http://www.quirksmode.org/dom/range_intro.html

var range = document.createRange();
// In which DOM node does the Range start or end?
range.setStart(selectionObject.anchorNode, selectionObject.anchorOffset);
// At which text offset does the Range start or end? The text offset is the position of the first or last character in the text node that's part of the Range.
range.setEnd(selectionObject.focusNode, selectionObject.focusOffset);

find-text-nodes.js

// See: javascript - Find all text nodes - Stack Overflow
// http://stackoverflow.com/questions/9178174/find-all-text-nodes

function doSomething(element) {
  console.log("type:" + typeof element, "class:" + element, "content:", element);
}

function recurse(element)
{
    if (element.childNodes.length > 0) 
        for (var i = 0; i < element.childNodes.length; i++) 
            recurse(element.childNodes[i]);

    if (element.nodeType == Node.TEXT_NODE && /\S/.test(element.nodeValue)) 
        doSomething(element);
}
var html = document.getElementsByTagName('html')[0];
recurse(html);

selected-text.js

var range = window.getSelection().getRangeAt(0);
range.endContainer.textContent.slice(range.startOffset, range.endOffset);