JavaScript
Article
By Sam Deering

6 jQuery Cursor Functions

By Sam Deering
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jQuery code snippets to perform wonders with your mouse cursor! They can be used for setting and getting text cursor positions within input and textarea fields and selection ranges. Enjoy!

//Example jQuery get cursor position function call
$("input[name='username']").getCursorPosition();
jQuery.fn.getCursorPosition = function(){
	if(this.lengh == 0) return -1;
	return $(this).getSelectionStart();
}
//Example jQuery set cursor position function call
$("input[name='username']").setCursorPosition(5);
jQuery.fn.setCursorPosition = function(position){
	if(this.lengh == 0) return this;
	return $(this).setSelection(position, position);
}

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//Example jQuery get text selection function call
$("input[name='username']").getSelection();
jQuery.fn.getSelection = function(){
	if(this.lengh == 0) return -1;
	var s = $(this).getSelectionStart();
	var e = $(this).getSelectionEnd();
	return this[0].value.substring(s,e);
}
//Example jQuery get text selection start function call
$("input[name='username']").getSelectionStart();
jQuery.fn.getSelectionStart = function(){
	if(this.lengh == 0) return -1;
	input = this[0];

	var pos = input.value.length;

	if (input.createTextRange) {
		var r = document.selection.createRange().duplicate();
		r.moveEnd('character', input.value.length);
		if (r.text == '') 
		pos = input.value.length;
		pos = input.value.lastIndexOf(r.text);
	} else if(typeof(input.selectionStart)!="undefined")
	pos = input.selectionStart;

	return pos;
}
//Example jQuery get text selection end function call
$("input[name='username']").getSelectionEnd();
jQuery.fn.getSelectionEnd = function(){
	if(this.lengh == 0) return -1;
	input = this[0];

	var pos = input.value.length;

	if (input.createTextRange) {
		var r = document.selection.createRange().duplicate();
		r.moveStart('character', -input.value.length);
		if (r.text == '') 
		pos = input.value.length;
		pos = input.value.lastIndexOf(r.text);
	} else if(typeof(input.selectionEnd)!="undefined")
	pos = input.selectionEnd;

	return pos;
}
//Example jQuery set text selection function call
$("input[name='username']").setSelection(4, 20);
jQuery.fn.setSelection = function(selectionStart, selectionEnd) {
	if(this.lengh == 0) return this;
	input = this[0];

	if (input.createTextRange) {
		var range = input.createTextRange();
		range.collapse(true);
		range.moveEnd('character', selectionEnd);
		range.moveStart('character', selectionStart);
		range.select();
	} else if (input.setSelectionRange) {
		input.focus();
		input.setSelectionRange(selectionStart, selectionEnd);
	}

	return this;
}
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