html代码:

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">

<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>jQuery-textarea取选中文字-置textarea光标位置-响应快捷键示例</title>
<script type="text/JavaScript" src="jQuery-1.4.2.min.js"></script>
<script type="text/JavaScript" src="jQuery.selection.js"></script>
<script type="text/JavaScript">
$(function() {
var textval = '',
bpost = 0;
$("#description").select(function() {
$("#start").val($("#description").selection().start);
$("#end").val($("#description").selection().end);
textval = $("#description").selection().text;
bpost = $("#description").getCurPos();
});
$("#description").keydown(function(e) {
if (e.shiftKey && e.which == 98 || e.which == 66) {
var rstr = "[b]" + textval + "[/b]";
$("#description").val($("#description").val().replace(textval, rstr));
$("#description").setCurPos(bpost + rstr.length);
$("#text").val(textval);
return false;
}
})
});
</script>
</head>
<body>
<h3>jQuery-textarea取选中文字-置textarea光标位置-响应快捷键示例
</h3>
<textarea id="description" rows="8" cols="50">jQuery-textarea取选中文字-置textarea光标位置-响应快捷键示例 jQuery-textarea取选中文字-置textarea光标位置-响应快捷键示例jQuery-textarea取选中文字-置textarea光标位置-响应快捷键示例
</textarea>
<br>
选中字符:<br>
<textarea id="text" rows="8" cols="50">
</textarea>
</body>
</html>

jQuery.selection.js
源码(整合自网络):

(function($){
$.fn.selection = function(){
var s,e,range,stored_range;
if(this[0].selectionStart == undefined){
var selection=document.selection;
if (this[0].tagName.toLowerCase() != "textarea") {
var val = this.val();
range = selection.createRange().duplicate();
range.moveEnd("character", val.length);
s = (range.text == "" val.length:val.lastIndexOf(range.text));
range = selection.createRange().duplicate();
range.moveStart("character", -val.length);
e = range.text.length;
}else {
range = selection.createRange(),
stored_range = range.duplicate();
stored_range.moveToElementText(this[0]);
stored_range.setEndPoint('EndToEnd', range);
s = stored_range.text.length - range.text.length;
e = s + range.text.length;
}
}else{
s=this[0].selectionStart,
e=this[0].selectionEnd;
}
var te=this[0].value.substring(s,e);
return {start:s,end:e,text:te}
};
$.fn.extend({
getCurPos: function(){
var e=$(this).get(0);
e.focus();
if(e.selectionStart != undefined){ //FF
return e.selectionStart;
}else{ //IE
var r = document.selection.createRange();
if (r == null) {
return e.value.length;
}
var re = e.createTextRange();
var rc = re.duplicate();
re.moveToBookmark(r.getBookmark());
rc.setEndPoint('EndToStart', re);
return rc.text.length;
}
return e.value.length;
},
setCurPos: function(pos) {
var e=$(this).get(0);
e.focus();
if (e.setSelectionRange) {
e.setSelectionRange(pos, pos);
} else if (e.createTextRange) {
var range = e.createTextRange();
range.collapse(true);
range.moveEnd('character', pos);
range.moveStart('character', pos);
range.select();
}
}
});
})(jQuery);

jQuery-1.4.2.min.js源码:

/*!
* jQuery JavaScript Library v1.4.2
* http://jQuery.com/
*
* Copyright 2010, John Resig
* Dual licensed under the MIT or GPL Version 2 licenses.
* http://jQuery.org/license
*
* Includes Sizzle.js
* http://sizzlejs.com/
* Copyright 2010, The Dojo Foundation
* Released under the MIT, BSD, and GPL Licenses.
*
* Date: Sat Feb 13 22:33:48 2010 -0500
*/
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