/*

CUSTOM FORM ELEMENTS

Created by Ryan Fait
www.ryanfait.com

The only things you may need to change in this file are the following
variables: checkboxHeight, radioHeight and selectWidth (lines 24, 25, 26)

The numbers you set for checkboxHeight and radioHeight should be one quarter
of the total height of the image want to use for checkboxes and radio
buttons. Both images should contain the four stages of both inputs stacked
on top of each other in this order: unchecked, unchecked-clicked, checked,
checked-clicked.

You may need to adjust your images a bit if there is a slight vertical
movement during the different stages of the button activation.

The value of selectWidth should be the width of your select list image.

Visit http://ryanfait.com/ for more information.

*/
"use strict";
var checkboxHeight = "25";
var radioHeight = "25";
var selectWidth = "190";

/* No need to change anything after this */


document.write('<style type="text/css">input.styled { display: none; } select.styled { position: relative; width: ' + selectWidth + 'px; opacity: 0; filter: alpha(opacity=0); z-index: 5; } .disabled { opacity: 0.5; filter: alpha(opacity=50); }</style>');

var Custom = {
	init: function() {
		var inputs = document.getElementsByTagName("input"), span = Array(), textnode, option, active;
		for(var a = 0; a < inputs.length; a++) {
			if((inputs[a].type == "checkbox" || inputs[a].type == "radio") && inputs[a].className == "styled") {
				span[a] = document.createElement("span");
				span[a].className = inputs[a].type;

				if(inputs[a].checked === true) {
				    var position;
					if(inputs[a].type == "checkbox") {
						position = "0 -" + (checkboxHeight*2) + "px";
						span[a].style.backgroundPosition = position;
					} else {
						position = "0 -" + (radioHeight*2) + "px";
						span[a].style.backgroundPosition = position;
					}
				}
				inputs[a].parentNode.insertBefore(span[a], inputs[a]);
				inputs[a].onchange = Custom.clear;
				if(!inputs[a].getAttribute("disabled")) {
					span[a].onmousedown = Custom.pushed;
					span[a].onmouseup = Custom.check;
				} else {
					span[a].className = span[a].className += " disabled";
				}
			}
		}

        /**
         * Due to firefox browser cache/quirks, sometimes old span elements
         * are still present when you hit the back button. This routine here,
         * removes all previous occurances of the span, before the correct
         * span gets created in the next section.
         * I need to spin through all the span tags because IE, does not
         * provide getElementsByClassName.
         */
		var old_span = [];
		var span_tags = document.getElementsByTagName("span");
		for(var t=0; t<span_tags.length; t++)
		{
		    if(span_tags[t].className == "select")
		    {
		        old_span.push(span_tags[t]);
		    }
		}
		for(var p=0; p<old_span.length; p++) {
		    old_span[p].parentNode.removeChild(old_span[p]);
		}

		inputs = document.getElementsByTagName("select");
		for(var c = 0; c < inputs.length; c++) {
			if(inputs[c].className == "styled") {
				option = inputs[c].getElementsByTagName("option");
				active = option[0].childNodes[0].nodeValue;
				textnode = document.createTextNode(active);
				for(var f = 0; f < option.length; f++) {
					if(option[f].selected === true) {
						textnode = document.createTextNode(option[f].childNodes[0].nodeValue);
					}
				}
				span[c] = document.createElement("span");
				span[c].className = "select";
				span[c].id = "select" + inputs[c].name;
				span[c].appendChild(textnode);
				inputs[c].parentNode.insertBefore(span[c], inputs[c]);
				if(!inputs[c].getAttribute("disabled")) {
					inputs[c].onchange = Custom.choose;
				} else {
					inputs[c].previousSibling.className = inputs[c].previousSibling.className += " disabled";
				}
			}
		}
		document.onmouseup = Custom.clear;
	},
	pushed: function() {
		var element = this.nextSibling;
		if(element.checked === true && element.type == "checkbox") {
			this.style.backgroundPosition = "0 -" + checkboxHeight*3 + "px";
		} else if(element.checked === true && element.type == "radio") {
			this.style.backgroundPosition = "0 -" + radioHeight*3 + "px";
		} else if(element.checked !== true && element.type == "checkbox") {
			this.style.backgroundPosition = "0 -" + checkboxHeight + "px";
		} else {
			this.style.backgroundPosition = "0 -" + radioHeight + "px";
		}
	},
	check: function() {
		var element = this.nextSibling;
		if(element.checked === true && element.type == "checkbox") {
			this.style.backgroundPosition = "0 0";
			element.checked = false;
		} else {
			if(element.type == "checkbox") {
				this.style.backgroundPosition = "0 -" + checkboxHeight*2 + "px";
			} else {
				this.style.backgroundPosition = "0 -" + radioHeight*2 + "px";
				var group = this.nextSibling.name;
				var inputs = document.getElementsByTagName("input");
				for(var a = 0; a < inputs.length; a++) {
					if(inputs[a].name == group && inputs[a] != this.nextSibling) {
						inputs[a].previousSibling.style.backgroundPosition = "0 0";
					}
				}
			}
			element.checked = true;
		}
	},
	clear: function() {
		var inputs = document.getElementsByTagName("input");
		for(var b = 0; b < inputs.length; b++) {
			if(inputs[b].type == "checkbox" && inputs[b].checked === true && inputs[b].className == "styled") {
				inputs[b].previousSibling.style.backgroundPosition = "0 -" + checkboxHeight*2 + "px";
			} else if(inputs[b].type == "checkbox" && inputs[b].className == "styled") {
				inputs[b].previousSibling.style.backgroundPosition = "0 0";
			} else if(inputs[b].type == "radio" && inputs[b].checked === true && inputs[b].className == "styled") {
				inputs[b].previousSibling.style.backgroundPosition = "0 -" + radioHeight*2 + "px";
			} else if(inputs[b].type == "radio" && inputs[b].className == "styled") {
				inputs[b].previousSibling.style.backgroundPosition = "0 0";
			}
		}
	},
	choose: function() {
		var option = this.getElementsByTagName("option");
		for(var d = 0; d < option.length; d++) {
			if(option[d].selected === true) {
				document.getElementById("select" + this.name).childNodes[0].nodeValue = option[d].childNodes[0].nodeValue;
			}
		}
	}
};
window.onload = Custom.init;