在 textarea 中光标位置插入字符串

好久没晒代码了。今天心情不错，搬出来晒晒太阳。

回过头来看看，代码有问题，继续修改下。2012-10-24

<html>
	<body>
		<textarea onmouseup="getCursorInfo(this)" onkeyup="setPosition(this)">123456</textarea>
		<script>
			var getCursorInfo = function (textarea) {
				var result = {};
				if (textarea.setSelectionRange) { 
					// W3C
					result.end = textarea.selectionEnd;
					result.start = textarea.selectionStart;
					result.text = textarea.value.substring(result.start, result.end);
				} else if (document.selection) { 
					// IE
					var i = 0,
					oS = document.selection.createRange(),
					// Don't: oR = textarea.createTextRange()
					oR = document.body.createTextRange();
					oR.moveToElementText(textarea);
					result.text = oS.text;
					oS.getBookmark();
					// object.moveStart(sUnit [, iCount])
					// Return Value: Integer that returns the number of units moved.
					for (i = 0; oR.compareEndPoints('StartToStart', oS) < 0 && oS.moveStart("character", -1) !== 0; i ++) {
						// Why? You can alert(textarea.value.length)
						if (textarea.value.charAt(i) == '/n') {
							i ++;
						}
					}
				result.start = i;
				result.end = i + result.text.length;
			}

			return result;
		}

		var setPosition = function (textarea) {
			if (textarea.setSelectionRange) { 
				textarea.setSelectionRange(2, 6);
			} else {
				var oR = textarea.createTextRange();
				oR.collapse(true);
				oR.moveStart('character', 2);
				oR.moveEnd('character', 6);
				oR.select();
			}
		}
	&lt;/script&gt;
&lt;/body&gt;

</html>

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