Allow only float numbers with 2 decimals and 1 decimal dot

// credit to http://stackoverflow.com/questions/21374605/java-script-to-allow-only-numbers-comma-dot-back-space
function _validateFloatNumber(element, evt) {
	var event, key, numberSplitByDot,
		caretPos, dotPos, regex, notValid = false;

	event = evt || window.event;
	key = event.keyCode || event.which;
	key = String.fromCharCode(key);
	if (key.length == 0) { // do nothing if it is non-char button
		return;
	}
	if (event.charCode == 0) { // in Firefox key will be not empty but charCode will be 0 for non-char buttons
		return;
	}

	regex = /^[0-9.\b]+$/; // allow only numbers and decimal dot
	if (!regex.test(key)) {
		notValid = true;
	}

	numberSplitByDot = element.value.split('.');
	if (numberSplitByDot.length > 1 && key == '.') { // only 1 dot
		notValid = true;
	}

	caretPos = _getCursorPosition(element);
	dotPos = element.value.indexOf('.');
	if (caretPos > dotPos && numberSplitByDot[1] && numberSplitByDot[1].length > 1) { // only 2 digits after dot
		notValid = true;
	}

	if (notValid) {
		event.returnValue = false;
		if (event.preventDefault) {
			event.preventDefault();
		}
	}
}

// credit to http://stackoverflow.com/questions/2897155/get-cursor-position-in-characters-within-a-text-input-field
function _getCursorPosition(element) {
	var caretPos = 0;
	if ('selectionStart' in element) { // modern browsers
		caretPos = element.selectionStart;
	} else if (document.selection) { // IE
		element.focus();
		var sel = document.selection.createRange(); // to get cursor position, get empty selection range
		var selLen = document.selection.createRange().text.length;
		sel.moveStart('character', -element.value.length); // move selection start to 0 position
		caretPos = sel.text.length - selLen; // the caret position is selection length
	}
	return caretPos;
}

jQuery(function($){ // document.ready and noConflict mode
        $('.target').on('keypress', function (event) {
              return _validateFloatNumber(this, event);
        });
});