validation.js

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/*********************************************************************
multi-language validation script
	version 2.21
	by matthew frank

There are no warranties expressed or implied.  I will not be held
responsible for any loss of data or sanity through the use or
implementation of this script.  This script may be re-used and
distrubted freely provided this header remains intact and all
supporting files are included (unaltered) in the distribution:

	validation.js   - this file
	validation.htm  - example form
	readme.htm      - directions on using this script
	(validation.zip contains all files)

If you are interested in keeping up with the latest releases of this
script or asking questions about its implementation, think about joining
the eGroups discussion forum dedicated to data validation:

	http://www.egroups.com/group/validation

*********************************************************************/


/*====================================================================
Function: Err
Purpose:  Custom object constructor
Inputs:   None
Returns:  undefined
====================================================================*/
function Err(){
	/*********************************************************************
	Method:   Err.clear
	Purpose:  Clear values from Error object
	Inputs:   none
	Returns:  undefined
	*********************************************************************/
	this.clear=function (){
		this.source=new Object;
		this.type=new Object;
		this.format=new String;
	}
	/*********************************************************************
	Method:   Err.add
	Purpose:  Adds error to Error object
	Inputs:   oSource - source element object
	          vType   - integer value of error type (or custom string)
	          sFormat - optional date format
	Returns:  undefined
	*********************************************************************/
	this.add=function (oSource,vType,sFormat){
		this.source=oSource;
		this.type=vType;
		this.format=sFormat;
	}
	/*********************************************************************
	Method:   Err.raise
	Purpose:  Gives visual warning to user about all errors contained in
	          the Error object
	Inputs:   none
	Returns:  undefined
	*********************************************************************/
	this.raise=function (){
		var oElement=this.source;
		var sLang;
		var sNym=oElement.getAttribute("nym");
		// if type is not a number, it must be a custom error message
		var sMsg=(typeof this.type=="string")?this.type:oElement.getAttribute("msg");

		oElement.paint();
		if(oElement.select)
			oElement.select();
		if(sMsg)
			alert(sMsg);
		else{
			// Walk through object hierarchy to find applicable language
			var oParent=oElement;
			sLang=oParent.getAttribute("lang").substring(0,2).toLowerCase();
			while(!sLang || !_validation.messages[sLang]){
				oParent=oParent.parentElement;
				if(oParent)
					sLang=oParent.getAttribute("lang").substring(0,2).toLowerCase();
				else
					// Default language is Chinese
					sLang="cn";
			}
			sMsg=_validation.messages[sLang][this.type];
			alert(((sNym)?sNym+": ":"")+sMsg+((this.format)
				?" "+this.format.reformat(sLang,this.type):""));
		}

		// Perform onvalidatefocus event handler for invalid field
		if(oElement.onvalidatefocus)
			oElement.onvalidatefocus();

		// Give invalid field focus
		oElement.focus();
		// Clear the Err object
		this.clear();
	}

	// Define the working object model
	this.clear();
}

/*====================================================================
Function: Validation
Purpose:  Custom object constructor.
Inputs:   None
Returns:  undefined
====================================================================*/
function Validation(){
	// Define global constants for calls to error message arrays
	this.REQUIRED = 0;
	this.INTEGER  = 1;
	this.FLOAT    = 2;
	this.DATE     = 3;
	this.AMOUNT   = 4;
	this.MASK     = 5;
	this.TIMECODE = 6;

	// Create error message dictionary
	this.messages = new Array;

	// Prototype the date tokens for each language
	Array.prototype.MM = new String;
	Array.prototype.DD = new String;
	Array.prototype.YYYY = new String;

	//English
	this.messages["en"]=new Array(
		"Please enter a value",
		"Please enter a valid integer",
		"Please enter a valid floating point",
		"Please enter a valid date",
		"Please enter a valid monetary amount",
		"Please enter a value in the form of ");
		with(this.messages["en"]){
			MM="MM";
			DD="DD";
			YYYY="YYYY";
		}

	//Chinese
	this.messages["cn"]=new Array(
		"请输入该项目",
		"请输入一个有效的整数",
		"请输入一个有效的浮点数",
		"请输入一个有效的日期",
		"请输入有效的金额",
		"请按照以下的形式输入:",
		"请输入一个有效的时码,按照以下的形式:");
		with(this.messages["cn"]){
			YYYY="YYYY";
			MM="MM";
			DD="DD";
		}


	/*********************************************************************
	Method:   Validation.setDefault
	Purpose:  Set value for variable v if v is zero, empty string or
	          undefined
	Inputs:   v - variable (passed by value)
	          d - default value
	Returns:  v or d
	*********************************************************************/
	this.setDefault=function (v, d){
		return (v)?v:d;
	}
	/*********************************************************************
	Method:   Validation.isDate
	Purpose:  Check that value is a date of the correct format
	Inputs:   oElement - form element
	          sFormat  - string format
	Returns:  boolean
	*********************************************************************/
	this.isDate=function (oElement,sFormat){
		var sDate=oElement.value;
		var aDaysInMonth=new Array(31,28,31,30,31,30,31,31,30,31,30,31);
		
		sDate = sDate.replace("年","-");
		sDate = sDate.replace("月","-");
		sDate = sDate.replace("日","");

		// Fetch the date separator from the user's input
		var sSepDate=sDate.charAt(sDate.search(/\D/));
		// Fetch the date separator from the format
		var sSepFormat=sFormat.charAt(sFormat.search(/[^MDY]/i));
		// Compare separators
		if (sSepDate!=sSepFormat)
			return false;

		// Fetch the three pieces of the date from the user's input and the format
		var aValueMDY=sDate.split(sSepDate);
		var aFormatMDY=sFormat.split(sSepFormat);
		var iMonth,iDay,iYear;

		// Validate that all pieces of the date are numbers
		if (  !_validation.isNum(aValueMDY[0])
			||!_validation.isNum(aValueMDY[1])
			||!_validation.isNum(aValueMDY[2]))
			return false;

		// Assign day, month, year based on format
		switch (aFormatMDY[0].toUpperCase()){
			case "YYYY" :
				iYear=aValueMDY[0];
				break;
			case "DD" :
				iDay=aValueMDY[0];
				break;
			case "MM" :
				iMonth=aValueMDY[0];
				break;
			default :
				return false;
		}
		switch (aFormatMDY[1].toUpperCase()){
			case "YYYY" :
				iYear=aValueMDY[1];
				break;
			case "MM" :
				iMonth=aValueMDY[1];
				break;
			case "DD" :
				iDay=aValueMDY[1];
				break;
			default :
				return false;
		}
		switch(aFormatMDY[2].toUpperCase()){
			case "MM" :
				iMonth=aValueMDY[2];
				break;
			case "DD" :
				iDay=aValueMDY[2];
				break;
			case "YYYY" :
				iYear=aValueMDY[2];
				break;
			default :
				return false;
		}

		// Require 4 digit year
		if(oElement.form.getAttribute("year4")!=null && iYear.length!=4)
			return false;
		// Process pivot date and update field
		var iPivot=_validation.setDefault(oElement.getAttribute("pivot"),
			oElement.form.getAttribute("pivot"));
		if(iPivot && iPivot.length==2 && iYear.length==2){
			iYear=((iYear>iPivot)?19:20).toString()+iYear;
			var sValue=aFormatMDY.join(sSepFormat).replace(/MM/i,iMonth);
			sValue=sValue.replace(/DD/i,iDay).replace(/YYYY/i,iYear);
			oElement.value=sValue;
		}

		// Check for leap year
		var iDaysInMonth=(iMonth!=2)?aDaysInMonth[iMonth-1]:
			((iYear%4==0 && iYear%100!=0 || iYear % 400==0)?29:28);

		return (iDay!=null && iMonth!=null && iYear!=null
				&& iMonth<13 && iMonth>0 && iDay>0 && iDay<=iDaysInMonth);
	}
	/********************************************
	Method:   Validation.isTimeCode
	Purpose:  Check that parameter is a TimeCode
	Inputs:   oElement - form element
	          sFormat  - string format
	Returns:  boolean
	********************************************/
	this.isTimeCode=function (oElement,sFormat){
		var sTimeCode=oElement.value;

		// Fetch the date separator from the user's input
		var sSepDate=sTimeCode.charAt(sTimeCode.search(/\D/));
		// Fetch the date separator from the format
		var sSepFormat=sFormat.charAt(sFormat.search(/[^HMSF]/i));
		// Compare separators
		if (sSepDate!=sSepFormat)
			return false;

		// Fetch the three pieces of the date from the user's input and the format
		var aValueHMSF=sTimeCode.split(sSepDate);
		var aFormatHMSF=sFormat.split(sSepFormat);
		var iHour,iMinute,iSecond,iFrame;

		// Validate that all pieces of the timecode are numbers
		if (  !_validation.isNum(aValueHMSF[0])
			||!_validation.isNum(aValueHMSF[1])
			||!_validation.isNum(aValueHMSF[2]))
			return false;

		// Assign hour, minute, second, frame based on format
		switch (aFormatHMSF[0].toUpperCase()){
			case "HH" :
				iHour=aValueHMSF[0];
				break;
			case "MM" :
				iMinute=aValueHMSF[0];
				break;
			case "SS" :
				iSecond=aValueHMSF[0];
				break;
			case "FF" :
				iFrame=aValueHMSF[0];
				break;
			default :
				return false;
		}
		switch (aFormatHMSF[1].toUpperCase()){
			case "HH" :
				iHour=aValueHMSF[1];
				break;
			case "MM" :
				iMinute=aValueHMSF[1];
				break;
			case "SS" :
				iSecond=aValueHMSF[1];
				break;
			case "FF" :
				iFrame=aValueHMSF[1];
				break;
			default :
				return false;
		}
		switch(aFormatHMSF[2].toUpperCase()){
			case "HH" :
				iHour=aValueHMSF[2];
				break;
			case "MM" :
				iMonth=aValueHMSF[2];
				break;
			case "SS" :
				iSecond=aValueHMSF[2];
				break;
			case "FF" :
				iFrame=aValueHMSF[2];
				break;
			default :
				return false;
		}
		switch(aFormatHMSF[3].toUpperCase()){
			case "HH" :
				iHour=aValueHMSF[3];
				break;
			case "MM" :
				iMonth=aValueHMSF[3];
				break;
			case "SS" :
				iSecond=aValueHMSF[3];
				break;
			case "FF" :
				iFrame=aValueHMSF[3];
				break;
			default :
				return false;
		}

		return (iHour!=null && iMinute!=null && iSecond!=null && iFrame!=null
				&& iHour<24 && iHour>=0 && iMinute>=0 && iMinute<60 && iSecond>=0 && iSecond<60 && iFrame>=0 && iFrame<25);
	}
	/********************************************
	Method:   Validation.isNum
	Purpose:  Check that parameter is a number
	Inputs:   v - string value
	Returns:  boolean
	********************************************/
	this.isNum=function (v){
		return (typeof v!="undefined" && v.toString() && !/\D/.test(v));
	}
	/*********************************************************************
	Method:   Validation.setup
	Purpose:  Set up methods and event handlers for all forms and elements
	Inputs:   none
	Returns:  undefined
	*********************************************************************/
	this.setup=function (){
		// Fan through forms on page to perform initializations
		var i,iForms=document.forms.length;
		for(i=0; i<iForms; i++){
			var oForm=document.forms[i];
			if(!oForm.bProcessed){
				/*********************************************
				Method:   Form.markRequired
				Purpose:  Mark all required fields for a form