// Être compatible avec MSIE...
if ('undefined' == typeof Node)
    Node = { ELEMENT_NODE: 1, TEXT_NODE: 3 };
		
function addListener(element, baseName, handler) {
    if (element.addEventListener)
        element.addEventListener(baseName, handler, false);
    else if (element.attachEvent)
        element.attachEvent('on' + baseName, handler);
} // addListener


//FORM VALIDATION
MSG_BLANK = ' doit être renseigné.';
MSG_NOT_A_DATE = ' n\'est pas une date.';
MSG_NOT_A_DOUBLE = ' n\'est pas un nombre.';
MSG_NOT_AN_INTEGER = ' n\'est pas un nombre entier.';
MSG_NOT_A_VALID_MAIL = ' n\'est pas une adresse e-mail valide.';
MSG_TOO_LOW = ' est trop petit(e).';
MSG_TOO_HIGH = ' est trop grand(e).';

REGEX_AUTO_FIELD = /^[^_]+(_Req)?(_(Int|Dbl|Date|Mail)(_[0-9.]+){0,2})?$/;
REGEX_BLANK = /^\s*$/;
REGEX_DAY = /^(0?[1-9]|[1-2][0-9]|3[01])$/;
REGEX_MONTH = /^(0?[1-9]|1[0-2])$/;
// Les multiples groupes vont nous découper l'ID tout seuls...
REGEX_TYPED_FIELD = /_(Int|Dbl|Date|Mail)(_([0-9.]+))?(_([0-9.]+))?$/;
REGEX_YEAR = /^[0-9]{2,4}$/;

function addFormChecks() {
    var forms = document.forms;
    for (var index = 0; index < forms.length; ++index) {
        var form = document.forms[index];
        addListener(form, 'submit', checkForm);
		//addListener(form, 'keypress', checkFormForKeyboard);
    }
} // addFormChecks

function checkForm(e) {
	// Compatibilité MSIE / les autres...
    e = e || window.event;
    var form = e.target || e.srcElement;
		
		var errors = '';
    var faulty = null;
    for (var index = 0; index < form.elements.length; ++index) {
        var field = form.elements.item(index);
        // Vérification de syntaxe
        if (!field.id.match(REGEX_AUTO_FIELD))
            continue;
        var value = getFieldValue(field);
        // Champ requis ?
        if (field.id.match(/_Req/) && value.match(REGEX_BLANK)) {
            errors += getFieldName(field) + MSG_BLANK + '<br />';
            faulty = faulty || field;
            continue;
        }
				// Champ typé ?
				var match = field.id.match(REGEX_TYPED_FIELD);
				if (match) {
						var type = match[1];
						var min = match[3];
						var max = match[5];
						var error = checkTypedField(value, type, min, max);
						if (error) {
					errors += getFieldName(field) + error + '\n';
					faulty = faulty || field;
						}
				}
    }
    if (!faulty)
	{
		execFormCommand(form);	
		stopEvent(e);
	}
    else
	{
		stopEvent(e);
		//alert(errors);
		document.getElementById('errorField').innerHTML=errors;
		faulty.focus();
	}
} // checkForm

function checkFormForKeyboard(e) {	
		if (e.keyCode==13)
		{
			// Compatibilité MSIE / les autres...
			//e = e || window.event;
			//var form = e.target || e.srcElement;
			var form = Event.findElement(e, 'form');
			var errors = '';
			var faulty = null;
			for (var index = 0; index < form.elements.length; ++index) {
					var field = form.elements.item(index);
					// Vérification de syntaxe
					if (!field.id.match(REGEX_AUTO_FIELD))
							continue;
					var value = getFieldValue(field);
					// Champ requis ?
					if (field.id.match(/_Req/) && value.match(REGEX_BLANK)) {
							errors += getFieldName(field) + MSG_BLANK + '<br />';
							faulty = faulty || field;
							continue;
					}
					// Champ typé ?
					/*var match = field.id.match(REGEX_TYPED_FIELD);
					if (match) {
							var type = match[1];
							var min = match[3];
							var max = match[5];
							var error = checkTypedField(value, type, min, max);
							if (error) {
						errors += getFieldName(field) + error + '\n';
						faulty = faulty || field;
							}
					}*/
			}
			if (!faulty)
			{
				execFormCommand(form);	
				stopEvent(e);
				return;
			}
			else
			{
				stopEvent(e);
				//alert(errors);
				document.getElementById('errorField').innerHTML=errors;
				faulty.focus();
			}
		}
} // checkFormForKeyboard

function checkTypedField(value, type, min, max) {
    // Valeurs par défaut pour les bornes
    min = min || Number.NEGATIVE_INFINITY;
    max = max || Number.POSITIVE_INFINITY;
    var val;
    if ('Int' == type) {
        try {
            val = parseInt(value, 10);
	    if (String(val) != value)
	    	throw val;
        } catch (e) {
            return MSG_NOT_AN_INTEGER;
        }
    }
    if ('Dbl' == type) {
        try {
            val = parseFloat(value);
	    if (String(val) != value)
	    	throw val;
        } catch (e) {
            return MSG_NOT_A_DOUBLE;
        }
    }
    if ('Int' == type || 'Dbl' == type) {
        if (val < min)
            return MSG_TOO_LOW;
        if (val > max)
            return MSG_TOO_HIGH;
    }
    if ('Date' == type) {
        var comps = value.split('/');
        if (3 != comps.length || !comps[0].match(REGEX_DAY) ||
            !comps[1].match(REGEX_MONTH) ||
            !comps[2].match(REGEX_YEAR))
            return MSG_NOT_A_DATE;
    }
		 if ('Mail' == type) {
				testm = false ;
				for (var j=1 ; j<(value.length) ; j++) {
					if (value.charAt(j)=='@') {
						if (j<(value.length-4)){
							for (var k=j ; k<(value.length-2) ; k++) {
								if (value.charAt(k)=='.') testm = true;
							}
					 	}
					}
				}		
			if (testm==false) return MSG_NOT_A_VALID_MAIL;
		}
    return null;
} // checkTypedField

function getFieldName(field) {
    var label = getLabelFor(field);
    if (!label)
        return field.name;
    var text = '';
    var node = label.firstChild;
    // Parcours en profondeur, dérécursifié, du fragment sous le libellé
    while (true) {
        if (Node.ELEMENT_NODE == node.nodeType && node.hasChildNodes())
            node = node.firstChild;
        else if (Node.TEXT_NODE == node.nodeType)
            text += node.nodeValue;
        if (node.nextSibling)
            node = node.nextSibling;
        else {
            node = node.parentNode;
            if (node == label)
                break;
            node = node.nextSibling;
        }
    }
    return text;
} // getFieldName

function getFieldValue(field) {
    if ('INPUT' == field.tagName || 'TEXTAREA' == field.tagName)
    {
			if (field.type == "checkbox")
			{
				if (field.checked)
					return "1";
				else
					return "0";
			}
			else
				return field.value;
		}
    if ('SELECT' == field.tagName) {
        var value = '';
        if (-1 < field.selectedIndex) {
            var opt = field.options[field.selectedIndex];
            value = opt.value;
            if (!value && !('value' in opt))
                value = opt.text;
        }
        return value;
    }
    return '';
} // getFieldValue

function getLabelFor(field) {
    var labels = document.getElementsByTagName('label');
    for (var index = 0; index < labels.length; ++index) {
        var label = labels.item(index);
        if (label.htmlFor == field.id)
            return label;
    }
    return null;
} // getLabelFor

function stopEvent(e) {
    if (e.stopPropagation) {
        e.stopPropagation();
        e.preventDefault();
    } else {
        e.cancelBubble = true;
        e.returnValue = false;
    }
} // stopEvent