react-examples/professional_javascript_for_web/ch12/DOMRangeExample2.htm at master · zhangjunhd/react-examples · GitHub

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<!DOCTYPE html>
<html>
    <head>
        <title>DOM Range Example</title>
        <script type="text/javascript">
            function useRanges() {
                var range1 = document.createRange(),
                    range2 = document.createRange(),
                    p1 = document.getElementById("p1"),
                    p1Index = -1,
                    i, len;

                for (i=0, len=p1.parentNode.childNodes.length; i < len; i++) {
                    if (p1.parentNode.childNodes[i] == p1) {
                        p1Index = i;
                        break;
                    }
                }

                range1.setStart(p1.parentNode, p1Index);
                range1.setEnd(p1.parentNode, p1Index + 1);
                range2.setStart(p1, 0);
                range2.setEnd(p1, p1.childNodes.length);


                document.getElementById("txtStartContainer1").value = range1.startContainer.tagName;
                document.getElementById("txtStartOffset1").value = range1.startOffset;
                document.getElementById("txtEndContainer1").value = range1.endContainer.tagName;
                document.getElementById("txtEndOffset1").value = range1.endOffset;
                document.getElementById("txtCommonAncestor1").value = range1.commonAncestorContainer.tagName;

                document.getElementById("txtStartContainer2").value = range2.startContainer.tagName;
                document.getElementById("txtStartOffset2").value = range2.startOffset;
                document.getElementById("txtEndContainer2").value = range2.endContainer.tagName;
                document.getElementById("txtEndOffset2").value = range2.endOffset;
                document.getElementById("txtCommonAncestor2").value = range2.commonAncestorContainer.tagName;
            }
        </script>
    </head>
    <body>
        <p id="p1"><b>Hello</b> world!</p>
        <input type="button" value="Use Ranges" onclick="useRanges()">
        <table border="0">
        <tr>
            <td>
                <fieldset>
                    <legend>range1</legend>
                    Start Container: <input type="text" id="txtStartContainer1"><br>
                    Start Offset: <input type="text" id="txtStartOffset1"><br>
                    End Container: <input type="text" id="txtEndContainer1"><br>
                    End Offset: <input type="text" id="txtEndOffset1"><br>
                    Common Ancestor: <input type="text" id="txtCommonAncestor1"><br>
                </fieldset>
            </td>
            <td>
                <fieldset>
                    <legend>range2</legend>
                    Start Container: <input type="text" id="txtStartContainer2"><br>
                    Start Offset: <input type="text" id="txtStartOffset2"><br>
                    End Container: <input type="text" id="txtEndContainer2"><br>
                    End Offset: <input type="text" id="txtEndOffset2"><br>
                    Common Ancestor: <input type="text" id="txtCommonAncestor2"><br>
                </fieldset>
            </td>
        </tr>
        </table>
        <p><strong>Note:</strong> This example uses DOM ranges and will only work in browsers that support DOM ranges. This example will fail in Internet Explorer &lt; 9.</p>
    </body>
</html>