» jQuery fieldSelection by Alex Brem v0.2.3 - last cange: 2006-12-20

/*
 * jQuery plugin: fieldSelection - v0.2.3 - last cange: 2006-12-20
 * (c) 2006 Alex Brem <alex@0xab.cd> - /web/20070404164425/http://blog.0xab.cd
 */

(function() {

	var rx_newline = /(\u000d\u000a|\u000a|\u000d|\u0085\u2028|\u2029)/gm;

	var fieldSelection = {
		
		getSelection: function() {

			var e = (this.jquery) ? this[0] : this;
			
			return (

				/* mozilla / dom 3.0 */
				('selectionStart' in e && function() {
					var l = e.selectionEnd - e.selectionStart;
					
					var range = { start: e.selectionStart, end: e.selectionEnd, length: l, text: e.value.substr(e.selectionStart, l) };

					if (e.tagName.toLowerCase() == 'textarea') {
						var col = range.row = 0;
						e.value.substr(0, range.start).replace(rx_newline, function() { range.row++; col = arguments[2] });
						range.col = (col) ? range.start - col - 1 : range.start;
					}

					return range;

				}) ||

				/* exploder */
				(document.selection && function() {

					e.focus();

					var r = document.selection.createRange();
					if (r === null) {
						return { start: 0, end: 0, length: 0 }
					}
					
					var re = e.createTextRange();
					var rc = re.duplicate();
					re.moveToBookmark(r.getBookmark());
					rc.setEndPoint('EndToStart', re);

					var range = { start: rc.text.length, end: rc.text.length + r.text.length, length: r.text.length, text: r.text };

					if (e.tagName.toLowerCase() == 'textarea') {
						var col = row = 0;

						e.value.substr(0, range.start).replace(rx_newline, function() { row++; col = arguments[2] });

						range.row = row;
						range.col = (col) ? range.start - col - 2 : range.start;
						
						/*
							see! this browser is stupid to such an extend. simply unbelievable.
							
							we need a fix because of IE getting the newline-thing wrong.
							IE counts \r\n  but they are under the cursor when the new line starts
							and so we do not get an carent/key event for this character (WTF!?)

							(update) hooray. I've hacked a solution.
							
							(update2) argh! HOLY SHIT! this crap works only until the 2nd line break.
							hey IE developers! no insulting, but did you code IE while you were on drugs?
							
							conclusion: the CR/LF handling of textareas is completely fucked up!
							
							try for yourself: disable the next code block, clear the textarea and
							enter just some newlines.. then move the caret up and down and watch
							the positions together with the hex dump.
							
							to be continued... *sigh*
						 */

						var rl = rc.duplicate();
						var bm = rc.getBookmark();
						// is there a preceding CR
						if (rl.findText("\r", 0, 536870912 + 131072)) { // \n is mysteriously undetectable!
							// yes. now set range from found CR to selection/caret
							rl.setEndPoint('EndToStart', re);
							//console.log(rl.text.length);
							if (rl.text == '') {
								// hooray! we're at the beginning of a new column
								// IE is stupid, so we have to zero col and inc row
								// but strangely this only works after the first CR/LF
								range.col = 0;
								range.row++;
							}

						}
					
					}
					
					return range;

				}) ||

				/* browser not supported */
				function() { return null }

			)();

		},

		setSelection: function() {
			
			var e = (this.jquery) ? this[0] : this;
			
			var index = (arguments.length > 0) && ( // -1 means don't change index
									( typeof arguments[0] == 'string') && (
													((arguments[0] == ''  || arguments[0] == 'none'   ) && [   -1,    0]) // unselect all
											||	((arguments[0] == '*' || arguments[0] == 'all'    ) && [    0,   -1]) // select all
											||	((arguments[0] == '<' || arguments[0] == 'tostart') && [    0, null]) // select start to current
											||	((arguments[0] == '>' || arguments[0] == 'toend'  ) && [  null,   -1]) // select current to end
											||	((arguments[0] == '^' || arguments[0] == 'start'  ) && [    0,    0]) // cursor to start
											||	((arguments[0] == '$' || arguments[0] == 'end'    ) && [   null, -1]) // cursor to end
											||	((arguments[0] == '|' || arguments[0] == 'center' ) && [  '|',  '|']) // select word under cursor
										) ||
										( typeof arguments[0] == 'object') && (
													(('start' in arguments[0] || 'end' in arguments[0]) && [arguments[0]['start'] || null, arguments[0]['end'] || null]) // json {start: n, end: n}
											||	('pos' in arguments[0] && [arguments[0]['pos'], arguments[0]['pos']] || null) // json {pos: n}
											||	((typeof arguments[0][0] != 'undefined' && typeof arguments[0][1] != 'undefined') && arguments[0]) // array [start, end]
										) || ( arguments.length == 2) && [arguments[0], arguments[1]] // 2 parameters (start, end)
									)		|| [null, null];

			var named = { 'current': null, 'start': 0, 'end': -1 };
			if (typeof index[0] == 'string') { index[0] = (index[0] in named) ? named[index[0]] : null }
			if (typeof index[1] == 'string') { index[1] = (index[1] in named) ? named[index[1]] : null }
			
			return (
				
				/* mozilla / dom 3.0 */
				('selectionStart' in e && function() {
					e.focus();

					// note: we could use setSelectionRange as a substitute
					e.selectionStart = (index[0] === null) ? e.selectionStart : index[0];
					e.selectionEnd = (index[1] === null) ? e.selectionEnd : ((index[1] == -1) ? e.value.length : index[1]);
					
					return jQuery(e);
				}) ||

				/* exploder */
				(document.selection && function() {
					var range = jQuery(e).getSelection();
					var start = (index[0] === null) ? range.start : index[0];
					var end = (index[1] === null) ? range.end : ((index[1] == -1) ? e.value.length : index[1]);

					var r = document.selection.createRange();
					var re = e.createTextRange();
					re.moveStart('character', (index[0] === null) ? range.start : index[0]);
					re.moveEnd('character', (index[1] === null) ? -(e.value.length - range.end) : ((index[1] == -1) ? 0 : -(e.value.length - index[1])));
					r.moveToBookmark(re.getBookmark());
					r.select();

					return jQuery(e);
				}) ||

				/* browser not supported */
				function() { return jQuery(e) }
				
			)();
			
		},

		replaceSelection: function() {

			var e = (this.jquery) ? this[0] : this;
			var text = arguments[0] || '';
			var select_new = arguments[1] || false;

			return (

				/* mozilla / dom 3.0 */
				('selectionStart' in e && function() {
					e.focus();
					var start = e.selectionStart;
					e.value = e.value.substr(0, e.selectionStart) + text + e.value.substr(e.selectionEnd, e.value.length);
					if (select_new) {
						e.setSelectionRange(start, start + text.length);
					}
					return jQuery(e);
				}) ||

				/* exploder */
				(document.selection && function() {
					e.focus();
					var r = document.selection.createRange();
					r.text = text;
					if (!select_new) { // to make IE behave nicely we must use reverse psychology ;)
						r.collapse(false);
						r.select();
					}
					return jQuery(e);
				}) ||

				/* browser not supported */
				function() {
					e.value += text;
					return jQuery(e);
				}

			)();

		}

	};

	jQuery.each(fieldSelection, function(i) { jQuery.fn[i] = this; });

})();

fieldSelection - a jQuery plugin

Copyright (c) 2006, Alex Brem
All rights reserved.

Redistribution and use of this software in source and binary forms, with or without modification, are
permitted provided that the following conditions are met:

* Redistributions of source code must retain the above
  copyright notice, this list of conditions and the
  following disclaimer.

* Redistributions in binary form must reproduce the above
  copyright notice, this list of conditions and the
  following disclaimer in the documentation and/or other
  materials provided with the distribution.

* Neither my name nor the names of its contributors may
  be used to endorse or promote products derived from
  this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Mach mit!