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(function($) {
$.fn.caret = function(pos) {
var target = this[0];
var isContentEditable = target.contentEditable === 'true';
//get
if (arguments.length == 0) {
//HTML5
if (window.getSelection) {
//contenteditable
if (isContentEditable) {
target.focus();
var range1 = window.getSelection().getRangeAt(0),
range2 = range1.cloneRange();
range2.selectNodeContents(target);
range2.setEnd(range1.endContainer, range1.endOffset);
return range2.toString().length;
}
//textarea
return target.selectionStart;
}
//IE<9
if (document.selection) {
target.focus();
//contenteditable
if (isContentEditable) {
var range1 = document.selection.createRange(),
range2 = document.body.createTextRange();
range2.moveToElementText(target);
range2.setEndPoint('EndToEnd', range1);
return range2.text.length;
}
//textarea
var pos = 0,
range = target.createTextRange(),
range2 = document.selection.createRange().duplicate(),
bookmark = range2.getBookmark();
range.moveToBookmark(bookmark);
while (range.moveStart('character', -1) !== 0) pos++;
return pos;
}
//not supported
return 0;
}
//set
if (pos == -1)
pos = this[isContentEditable? 'text' : 'val']().length;
//HTML5
if (window.getSelection) {
//contenteditable
if (isContentEditable) {
target.focus();
window.getSelection().collapse(target.firstChild, pos);
}
//textarea
else
target.setSelectionRange(pos, pos);
}
//IE<9
else if (document.body.createTextRange) {
var range = document.body.createTextRange();
range.moveToElementText(target);
range.moveStart('character', pos);
range.collapse(true);
range.select();
}
if (!isContentEditable)
target.focus();
return pos;
}
})(jQuery)
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