/*
Form Validator
Author: Peter Tornstrand <peter[at]tornstrand[dot]com>
Homepage: http://www.tornstrand.com/scripts/javascript-form-validation/
Date: 2006-07-02
Version: 1.21
*/

/*
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 = 'Please, input '+labels[i].innerHTML.replace('(*)','');
            }
        }
    } else {
        for (var i = 0; i<labels.length; i++) {
            if (labels[i].htmlFor==el.id) {
                errorMsg = 'Field <b>'+labels[i].innerHTML.replace('(*):','')+'</b> is required!';
            }
        }
    }
   
    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);
}