/*
	CRIR - Checkbox & Radio Input Replacement
	Author: Chris Erwin (me[at]chriserwin.com)
*/

crir = {
	userAgent: '',
	isSafari: false,
	init: function() {

		this.userAgent = navigator.userAgent.toLowerCase();
		this.isSafari = ((this.userAgent.indexOf('safari')!=-1)&&(this.userAgent.indexOf('mac')!=-1))?true:false;

		if (! this.isSafari) { // the script doesn't work in safari.
			arrLabels = document.getElementsByTagName('label');

			searchLabels:
			for (var i=0; i<arrLabels.length; i++) {
				// get the input element based on the for attribute of the label tag
				if (arrLabels[i].getAttributeNode('for') && arrLabels[i].getAttributeNode('for').value != '') {
					labelElementFor = arrLabels[i].getAttributeNode('for').value;
					inputElement = document.getElementById(labelElementFor);
				}
				else {
					continue searchLabels;
				}

				inputElementClass = inputElement.className;

				// if the input is specified to be hidden intiate it
				if (inputElementClass == 'crirHiddenJS') {
					inputElement.className = 'crirHidden';

					inputElementType = inputElement.getAttributeNode('type').value;

					// add the appropriate event listener to the input element
					if (inputElementType == "checkbox") {
						inputElement.onclick = crir.toggleCheckboxLabel;
					}
					else {
						inputElement.onclick = crir.toggleRadioLabel;
					}

					// set the initial label state
					if (inputElement.checked) {
						if (inputElementType == 'checkbox') { arrLabels[i].className = 'checkbox_checked'}
						else { arrLabels[i].className = 'radio_checked' }
					}
					else {
						if (inputElementType == 'checkbox') { arrLabels[i].className = 'checkbox_unchecked'}
						else { arrLabels[i].className = 'radio_unchecked' }
					}
				}
				else if (inputElement.nodeName != 'SELECT' && inputElement.getAttributeNode('type').value == 'radio') { // this so even if a radio is not hidden but belongs to a group of hidden radios it will still work.
					arrLabels[i].onclick = crir.toggleRadioLabel;
					inputElement.onclick = crir.toggleRadioLabel;
				}
			}
		}
	},

	findLabel: function (inputElementID) {
		arrLabels = document.getElementsByTagName('label');

		searchLoop:
		for (var i=0; i<arrLabels.length; i++) {
			if (arrLabels[i].getAttributeNode('for') && arrLabels[i].getAttributeNode('for').value == inputElementID) {
				return arrLabels[i];
				break searchLoop;
			}
		}
	},

	toggleCheckboxLabel: function () {
		labelElement = crir.findLabel(this.getAttributeNode('id').value);
		if(labelElement.className == 'checkbox_checked') {
			labelElement.className = "checkbox_unchecked";
		}
		else {
			labelElement.className = "checkbox_checked";
		}
		updateBoxes(this.getAttributeNode('id').value);

	},

	toggleRadioLabel: function () {
		clickedLabelElement = crir.findLabel(this.getAttributeNode('id').value);

		clickedInputElement = this;
		clickedInputElementName = clickedInputElement.getAttributeNode('name').value;

		arrInputs = document.getElementsByTagName('input');

		// uncheck (label class) all radios in the same group
		for (var i=0; i<arrInputs.length; i++) {
			inputElementType = arrInputs[i].getAttributeNode('type').value;
			if (inputElementType == 'radio') {
				inputElementName = arrInputs[i].getAttributeNode('name').value;
				inputElementClass = arrInputs[i].className;
				// find radio buttons with the same 'name' as the one we've changed and have a class of chkHidden
				// and then set them to unchecked
				if (inputElementName == clickedInputElementName && inputElementClass == 'crirHidden') {
					inputElementID = arrInputs[i].getAttributeNode('id').value;
					labelElement = crir.findLabel(inputElementID);
					labelElement.className = 'radio_unchecked';
				}
			}
		}

		// if the radio clicked is hidden set the label to checked
		if (clickedInputElement.className == 'crirHidden') {
			clickedLabelElement.className = 'radio_checked';
		}
	},

	addEvent: function(element, eventType, doFunction, useCapture){
		if (element.addEventListener)
		{
			element.addEventListener(eventType, doFunction, useCapture);
			return true;
		} else if (element.attachEvent) {
			var r = element.attachEvent('on' + eventType, doFunction);
			return r;
		} else {
			element['on' + eventType] = doFunction;
		}
	}
}

crir.addEvent(window, 'load', crir.init, false);