// Javascript Form Validator Class

// Developer: Muhammad Tahir Shahzad

// http://mts.sw3solutions.com



function FormValidator(sForm)

{

	this.objForm = document.sForm;

	

	if (!this.objForm)

		this.objForm = document.getElementById(sForm);

		

	if (!this.objForm)

		alert("Error: Unable to create the Form Object.");	

	

	this.validate      = validate;

	this.getObject     = getObject;	

	this.value         = value;

	this.text          = text;	

	this.setValue      = setValue;

	this.select        = select;

	this.focus         = setFocus;

	this.checked       = checked;

	this.unchecked     = unchecked;	

	this.enabled       = enabled;

	this.disabled      = disabled;

	this.selectedValue = selectedValue;	

	this.selectedIndex = selectedIndex;

	this.valueAtIndex  = valueAtIndex;

	this.setIndex      = setIndex;

	this.submit        = submit;

	this.isChecked     = isChecked;

	this.setAction     = setAction;	

}



function isChecked(eField)

{

	return this.objForm[eField].checked;

}



function disabled(eField)

{

	this.objForm[eField].disabled = true;

}



function enabled(eField)

{

	this.objForm[eField].disabled = false;

}



function setAction(sAction)

{

	this.objForm.action = sAction;

}



function submit( )

{

	this.objForm.submit( );

}



function checked(eField)

{

	return this.objForm[eField].checked = true;

}



function unchecked(eField)

{

	return this.objForm[eField].checked = false;

}



function selectedValue(eField)

{

	var iLength = this.objForm[eField].length;



	if (iLength > 1)

	{

		for (var i = 0; i < iLength; i ++)

		{

			if (this.objForm[eField][i].checked == true)

				return this.objForm[eField][i].value;

		}

	}

	

	else

	{

			if (this.objForm[eField].checked == true)

				return this.objForm[eField].value;

	}

	

	return "";

}



function selectedIndex(eField)

{

	return this.objForm[eField].selectedIndex;

}



function setIndex(eField, iIndex)

{

	this.objForm[eField].selectedIndex = iIndex;

}



function valueAtIndex(eField, iIndex)

{

	return this.objForm[eField].options[iIndex].value;

}



function text(eField)

{

	return this.objForm[eField].options[this.objForm[eField].selectedIndex].text;

}



function value(eField)

{

	return this.objForm[eField].value;

}



function getObject(eField)

{

	return this.objForm[eField];

}



function setValue(eField, sValue)

{

	this.objForm[eField].value = sValue;

}



function select(eField)

{

	this.objForm[eField].select( );

}



function setFocus(eField)

{

	this.objForm[eField].focus( );

}



////////////////////// Input Checks

//  B = BLANK

//  C = ALPHABETS

//  N = NUMBER

//  E = EMAIL

//  F = FLOATING NUMBER

//  S = SIGNED

//  U = URL

//  L(N) = Length (Minium)



function validate(eField, sChecks, sMsg)

{

	sChecks = trim(sChecks);

	

	var sCheckOptions = new Array( );

	

	var i = 0;

	var iLength = 0;

	var bSigned = false;



	while (sChecks != "")

	{

 		var sTemp = "";

 		

 		if (sChecks.indexOf(',') == -1)

		{

 			sTemp = sChecks;

 			

 			sChecks = "";

 		}

 			

 		else

 		{

 			sTemp = sChecks.substring(0, sChecks.indexOf(','));



 			sChecks = sChecks.substring(sChecks.indexOf(',') + 1);

		}

		

 		if (sTemp.charAt(0) == "L")

 		{

 			iLength = parseInt(sTemp.substring(2, (sTemp.length - 1)));

 			

 			sTemp = "L";

 		}

 		

 		else if (sTemp.charAt(0) == "S")

 		{

 			bSigned = true;

 			

 			continue;

 		}

 		



		sCheckOptions.push(sTemp);

	}

	

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

	{

		switch(sCheckOptions[i])

		{		           

			case "B" : if (trim(this.objForm[eField].value) == "")

			           {

			           	alert(sMsg);

			           	

			           	this.objForm[eField].focus( );

			           	

			           	return false;

			           }

			           

			           break;





			case "C" : if (!validateAlphabetFormat(this.objForm[eField].value))

			           {

			           	alert(sMsg);

			           	

			           	this.objForm[eField].focus( );

			           	this.objForm[eField].select( );

			           	

			           	return false;

			           }

			           

			           break;

			           



			case "N" : if (!validateNumberFormat(this.objForm[eField].value, bSigned, false))

			           {

			           	alert(sMsg);

			           	

			           	this.objForm[eField].focus( );

			           	this.objForm[eField].select( );

			           	

			           	return false;

			           }

			           

			           break;

			           

			           

			case "F" : if (!validateNumberFormat(this.objForm[eField].value, bSigned, true))

			           {

			           	alert(sMsg);

			           	

			           	this.objForm[eField].focus( );

			           	this.objForm[eField].select( );

			           	

			           	return false;

			           }

			           

			           break;			           

			           

			           

			case "E" : if (!validateEmailFormat(this.objForm[eField].value))

				   {

			           	alert(sMsg);

			           	

			           	this.objForm[eField].focus( );

			           	this.objForm[eField].select( );

			           	

			           	return false;

			           }

			           	

			           break;

			           

			           

			case "L" : if (this.objForm[eField].value.length < iLength)

				   {

			           	alert(sMsg);

			           	

			           	this.objForm[eField].focus( );

			           	this.objForm[eField].select( );

			           	

			           	return false;

			           }

			           	

			           break;			           

			           

			           

			case "U" : if (!validateUrlFormat(this.objForm[eField].value))

				   {

			           	alert(sMsg);

			           	

			           	this.objForm[eField].focus( );

			           	this.objForm[eField].select( );

			           	

			           	return false;

			           }

			           	

			           break;		           			           

		}

	}

	

	return true;

}



function trim(sValue)

{

	return sValue.replace(/^\s+|\s+$/g, "");

}





function validateEmailFormat(sEmail)

{

	var iLength = sEmail.length;



	if (iLength == 0)

		return true;



	if (iLength < 5)

		return false;



	var sValidChars = "abcdefghijklmnopqrstuvwxyz0123456789@.-_";



	for (var i = 0; i < iLength; i++)

	{

		var sLetter = sEmail.charAt(i).toLowerCase( );



		if (sValidChars.indexOf(sLetter) != -1)

			continue;



		return false;

	}



	var iPosition = sEmail.indexOf('@');



	if (iPosition == -1 || iPosition == 0)

		return false;



	var sFirstPart = sEmail.substring(0, iPosition);



	sEmail = sEmail.substring((iPosition + 1));



	iPosition = sEmail.indexOf('.');



	if (iPosition == -1 || iPosition == 0)

		return false;



	var sSecondPart = sEmail.substring(0, iPosition);



	var sThirdPart = sEmail.substring((iPosition + 1));



	if(sSecondPart.indexOf('@') != -1 || sSecondPart.indexOf('_') != -1)

		return false;



	if(sThirdPart.indexOf('@') != -1 || sThirdPart.indexOf('_') != -1 || sThirdPart.indexOf('-') != -1 || sThirdPart.length < 2)

		return false;



	return true;

}





function validateAlphabetFormat(sText)

{

	var iLength = sText.length;



	if (iLength == 0)

		return true;



	var sValidChars = "abcdefghijklmnopqrstuvwxyz. ";



	for (var i = 0; i < iLength; i++)

	{

		var sLetter = sText.charAt(i).toLowerCase( );



		if (sValidChars.indexOf(sLetter) != -1)

			continue;



		return false;

	}



	return true;

}





function validateNumberFormat(sNumber, bSigned, bFraction)

{

	var sValidCharacters = "0123456789";

	var i = 0;

	

	if (bSigned == true)

	{

		if (sNumber.charAt(0) == "-")

			i ++;

	}

		

	if (bFraction == true)

	{

		if (sNumber.indexOf(".") != sNumber.lastIndexOf("."))

			return false;



		sValidCharacters += ".";

	}

	

	for (; i < sNumber.length; i ++)

	{

		if (sValidCharacters.indexOf(sNumber.charAt(i)) == -1)

			return false;

	}



	return true;

}



function validateUrlFormat(sUrl)

{

	var sRegExp = /^(([\w]+:)?\/\/)?(([\d\w]|%[a-fA-f\d]{2,2})+(:([\d\w]|%[a-fA-f\d]{2,2})+)?@)?([\d\w][-\d\w]{0,253}[\d\w]\.)+[\w]{2,4}(:[\d]+)?(\/([-+_~.\d\w]|%[a-fA-f\d]{2,2})*)*(\?(&?([-+_~.\d\w]|%[a-fA-f\d]{2,2})=?)*)?(#([-+_~.\d\w]|%[a-fA-f\d]{2,2})*)?$/;



	if(sRegExp.test(sUrl))

		return true;



	return false;

}