/*

Set to false if you don't want the error messages

*/

var err = true;



/*

Set to true if you want modal javascript dialogues instead of DOM messages

*/

var modal = false;



/*

Browser detect, need's a little work

*/

var ie;

if (navigator.appVersion.indexOf("MSIE")!=-1) {

	ie = true; 

} else {

	ie = false;

}



/**

* Loops through the page forms and add's onSubmit events to forms

* with the class name 'validate'.

**/

var addOnSubmitEvent = function() {

    var frms = document.getElementsByTagName('form');

    for (var i=0; i<frms.length; i++) {

        if (frms[i].className.indexOf('validate') != -1) {

            frms[i].onsubmit = function() {

                return validate(this);

            }

        }

    }

}



/**

* Function for displaying error message to user.

* @param frm [Object HTMLFormElement] The form

* @param el [Object HTMLInputElement] Source of the error message

**/

var displayErrorMessage = function(frm, el) {

   

    var labels = document.getElementsByTagName('label');

    var errorMsg = '';

   

    if (el.type=='radio'||el.type=='checkbox') {

        for (var i = 0; i<labels.length; i++) {

            if (labels[i].htmlFor== el.name) {

                errorMsg = 'Debes de estar deacuerdo con los ' + labels[i].innerHTML.replace('*','');

            }

        }

    } 



    else {

        for (var i = 0; i<labels.length; i++) {

            if (labels[i].htmlFor==el.id) {

                errorMsg = 'Enter your ' + labels[i].innerHTML.replace('*','');

            }

        }

    }

    

    if (err) {

        if (modal) {

            alert(errorMsg);

            el.focus();

        }

        else {

            if (document.getElementById(frm.id+'_errorMessage')) {

                frm.removeChild( document.getElementById (frm.id+'_errorMessage'));

            }

            var errorDiv = document.createElement('div');

            errorDiv.id = frm.id+'_errorMessage';

            errorDiv.className = 'errorMessage';

            errorDiv.innerHTML = errorMsg;

            frm.insertBefore(errorDiv, frm.childNodes[0]);

            el.focus();

        }

    }

}



/**

* Function called to validate form elements.

* @param frm [Object HTMLFormElement] The form to validate

* @return [Boolean] Did the form validate or not

**/

var validate = function(frm) {

	var el = frm.elements;

	for (var i=0; i<el.length; i++) {

    	if (el[i].className.indexOf('req') != -1) {

			

			// Text, Textarea, File

			if (el[i].type=='text'||el[i].type=='textarea'||el[i].type=='file') {

				if (el[i].value=="") {

					el[i].className = el[i].className + ' error';

 					err == true ? displayErrorMessage(frm, el[i]) : null;

					return false;

 				} else {

					el[i].className = el[i].className.replace('error','');

				}



			}



			// Radio

			else if (el[i].type=='radio') {

				var radiogroup = el[el[i].name];

		        var itemchecked = false;

		        for(var j = 0 ; j < radiogroup.length ; ++j) {

					if(radiogroup[j].checked) {

						itemchecked = true;

						break;

					}

		        }

		        if(!itemchecked) { 

					el[i].className = el[i].className + ' error';

 					err == true ? displayErrorMessage(frm, el[i]) : null;

					return false;

		        }

			}

			

			// Checkbox

			else if (el[i].type=='checkbox') {

				var itemchecked = false;

		        var elems = document.getElementsByTagName("input");

		        for(var j=0; j<elems.length; j++) {

					if(elems[j].type=='checkbox'&&elems[j].name==el[i].name) {

		        		if(elems[j].checked) {

		        			itemchecked = true;

		        			break;

		        		}

		        	}

		        }

		        if(!itemchecked) { 

					el[i].className = el[i].className + ' error';

 					err == true ? displayErrorMessage(frm, el[i]) : null;

					return false;

				}

			}

			

			// Select-one

			else if (el[i].type=='select-one') {

				if (el[i].selectedIndex==0) {

					el[i].className = el[i].className + ' error';

 					err == true ? displayErrorMessage(frm, el[i]) : null;

					return false;

		        } else {

		        	el[i].className = el[i].className.replace('error','');

		        }

			}

			

			// Select-multiple

			else if (el[i].type=='select-multiple') {

				var optionselected = false;

		      	for(var j=0;j<el[i].options.length; ++j) {

		      		if (el[i].options[j].selected) {

		      			optionselected = true;

		      			break;

		      		}

		      	}

		      	if (!optionselected) {

					el[i].className = el[i].className + ' error';

 					err == true ? displayErrorMessage(frm, el[i]) : null;

					return false;

		        } else {

		        	el[i].className = el[i].className.replace('error','');

		        }

			}

		}

	}

	return true;

}





/**

* Function called when a element changes it's value.

**/

var evaluate = function() {

	for (i=0; i<conds.length; i++) {

		var element = document.getElementsByName(conds[i][0]);

		var elemVal = conds[i][1];

		var elements = document.getElementsByName(conds[i][2]);

		var bol = conds[i][3];

		

		if (ie) {

		/* For Internet Explorer */

			for (var k=0; k<element.length; k++) {

				if (element[k].name==event.srcElement.name) {

					if (event.srcElement.type=='select-one') {

						if(event.srcElement[event.srcElement.selectedIndex].value==elemVal) {

							setState(elements, bol);

						} else {

							setState(elements, !bol);

						}

					} else if (event.srcElement.type=='select-multiple') {

						var optionselected = false;

						for(var j=0; j<event.srcElement.options.length; j++) {

		      				if (event.srcElement.options[j].value==elemVal&&event.srcElement.options[j].selected) {

		      					optionselected = true;

		      					break;

		      				}

		      			}

						if (optionselected) {

							setState(elements, bol);

						} else {

							setState(elements, !bol);

						}

					} else {

						if(event.srcElement.value==elemVal) {

							setState(elements, bol);

						} else {

							setState(elements, !bol);

						}

					}

				}

			}

		} else {

		/* For other browsers */

			for (var k=0; k<element.length; k++) {

				if (element[k].name==this.name) {

					if (this.type=='select-one') {

						if(this[this.selectedIndex].value==elemVal) {

							setState(elements, bol);

						} else {

							setState(elements, !bol);

						}

					} else if (this.type=='select-multiple') {

						var optionselected = false;

						for(var j=0; j<this.options.length; j++) {

		      				if (this.options[j].value==elemVal&&this.options[j].selected) {

		      					optionselected = true;

		      					break;

		      				}

		      			}

						if (optionselected) {

							setState(elements, bol);

						} else {

							setState(elements, !bol);

						}

					} else {

						if(this.value==elemVal) {

							setState(elements, bol);

						} else {

							setState(elements, !bol);

						}

					}

				}

			}

		}

	}

}



/**

* Set a single or a group of elements to required or not required.

* @param elements [Object HTMLCollection] The elements to set required states on

* @param bol [Boolean] Set elements required or not required

**/

var setState = function(elements, bol) {

	if (bol) {

		for (var j=0; j<elements.length; j++) {

			if (elements[j].className.indexOf('req')==-1) {

				elements[j].className += ' req';

			}

		}

	} else {

		for (var j=0; j<elements.length; j++) {

			newClassName = elements[j].className.replace('req','');

			elements[j].className = newClassName;

		}

	}

}



/**

* Attach conditions to form elements.

**/

var attachConditions = function() {

	attachBlurs(document.getElementsByTagName('input'));

	attachBlurs(document.getElementsByTagName('select'));

}



/**

* Attach onBlur or onClick to elements depending on element type.

* @param elements [Object HTLMCollection] The elements to attach onBlur events to

**/

var attachBlurs = function(elements) {

	for (var i=0; i<elements.length; i++) {

		if (elements[i].type=='checkbox'||elements[i].type=='radio') {

			if (ie) {

				elements[i].attachEvent('onclick', evaluate, false);

			} else {

				elements[i].addEventListener('click', evaluate, false);

			}

		} else {

			if (ie) {

				elements[i].attachEvent('onblur', evaluate, false);

			} else {

				elements[i].addEventListener('blur', evaluate, false);

			}

		}

	}

}



/*

Conditions

Syntax: conds.push(Array('element name','element value','element name', false));

You should put your conditions in a seperate file and include in the page.

*/

var conds = Array();



/*

Add onLoad events to start the whole thing

*/

if (ie) {

	window.attachEvent("onload", addOnSubmitEvent, false);

	window.attachEvent("onload", attachConditions, false);

} else {

	window.addEventListener("load", addOnSubmitEvent, false);

	window.addEventListener("load", attachConditions, false);

}