/*	global.js

Created for:	Oregon Graduate Institute (OGI)
Created by:		ISITE Design, Inc. (ISITE)

*/

function bCheck() {

	var browser;
	
	if (document.all) { 
	  browser = "IE";   
						
	} else if (document.layers) {
	 	browser = "NS4";
	} else if (document.getElementById) {
	  	browser = "NS6"; 
	} 
	
	return browser;

}

function showHide(anItem) {
		
	browser = bCheck();
	
	if (browser == "IE") {		
		if (document.all[anItem].style.display == 'none') {
			document.all[anItem].style.display = 'block';
		}
		else {
			document.all[anItem].style.display = 'none';
		}
	}
	
	if (browser == "NS4") {		
		if (document.layers[anItem].style.display == 'none') {
			document.layers[anItem].style.display = 'block';
		}
		else {
			document.layers[anItem].style.display = 'none';
		}
	}
	
	if (browser == "NS6") {
		if (document.getElementById(anItem).style.display == 'none') {
			document.getElementById(anItem).style.display = 'block';
		}
		else {
			document.getElementById(anItem).style.display = 'none';
		}
	}	
	
}

function setFocus(anItem) {
	browser = bCheck();
	
	if (browser == "IE") {
		//	anItem.focus();
		//	anItem.select();
		document[anItem].focus()
		
	}
	
	if (browser == "NS4") {
		document.layers[anItem].focus();
		document.layers[anItem].select();
	}
	
	if (browser == "NS6") {
		document.getElementById(anItem).focus();
		document.getElementById(anItem).select();
	}
}	


// Main validation function.
// Variables needed: form name
// All validation functions will be called from
// this function
// The actual validation functions will be outside
// of this function, either above or below it
// If any of the variables used in these functions
// are ColdFusion variables, the functions must be
// within CFOUTPUT tags
function ExtendJS(FormName) {
  // Call the function to validate a date as being
  // before today's date.
  // Variables to pass: form name, field name,
  // type
  // The type parameter will have a value of
  // either 'date' or 'eurodate'
  if (!DateLessThan(FormName,'DOB','date')) {
    alert("Your DOB cannot be after today.");
    return false;
  }
  // Call the RadioCheckBox function to
  // ensure one of a radio button series is
  // checked
  // Variables to pass: form name, field name,
  // number of items total, min required, max
  // required
  // * For radio fields, min and max will be 1
  // * The number of items total will most likely
  // be the RecordCount of the query used to
  // generate the options.
  if (!RadioCheckBox(FormName,'Sex',2,1,1))
  {
    alert("You must select your sex.");
    return false;
  }
  // Call the RadioCheckBox function to
  // ensure one (or more) of a checkbox series is
  // checked
  // Variables to pass: form name, field name,
  // number of items total, min required, max
  // required
  // * The number of items total will most likely
  // be the RecordCount of the query used to
  // generate the options.
  if
   (!RadioCheckBox(FormName,'Hobbies',4,2,3))
  {
    alert("You must select 2 or 3 hobbies.");
    return false;
  }
  // Call the SingleSelectRequired function to
  // ensure an item in a select box is chosen
  // Variables to pass: form name, field name
  if (!SingleSelectRequired(FormName,'Version')) {
    alert("You must a version of CF.");
    return false;
  }
  // Call the MultiSelectCheck function to ensure
  // one (or more) items in multi-select box are
  // chosen
  // Variables to pass: form name, field name
  if (!MultiSelectCheck(FormName,'FavTags',2,6)) {
    alert("You must at least 2 tags.");
    return false;
  }
  // Call the TextAreaRequired function to ensure
  // a textbox field is filled out
  // Variables to pass: form name, field name
  if (!TextAreaRequired(FormName, 'Comments')) {
    alert("You must enter some comments.");
  return false;
  }
}

// Validation functions

// Function to ensure a text area field is filled
// out.
// Variables needed: form name, field name
function TextAreaRequired(Form,Field) {
  // determine the length of the value of the
  // field.
  // The eval function will evaluate the statement
  // inside the parenthesis.
  var length = eval("document." + Form + "." + Field
    + ".value.length");
  // If the length of the value of the field is 0,
  // return false.
  if (length == 0) {
    return false;
  } else {
    return true;
  }
}

// Function to validate the number of items
// selected in a multi-select box
// Variables needed: form name, field name,
// minimum items selected,
// maximum items selected
function MultiSelectCheck(Form,Field,minReq,maxReq)
{
  // Set the selected var to a default of 0.
  var selected = 0;
  // Determine how many options are in the
  // multi-select box
  var length = eval("document." + Form + "." + Field
    + ".length");
  // Loop through the items in the multi-select
  //box
  for (i=0; i<length; i++) {
    // If an item is selected, increment the
    // selected var by one
    if (eval("document." + Form + "." + Field + "["
      + i + "].selected")) {
      selected++;
    }
  }
  // Determine if the number of items selected is
  // between the max and min values.
  // Return false if not, true if so
  if (selected < minReq || selected > maxReq) {
    return false;
  } else {
    return true;
  }
}

// Function to ensure that a value in a select box
// is selected
// Variables needed: form name, field name
function SingleSelectRequired(Form,Field) {
  // Determine the index of the item currently
  // selected
  var itemSelected = eval("document." + Form + "." +
    Field + ".selectedIndex");
  // If that index is 0, return false
  if (itemSelected == 0) {
    return false;
  } else {
    return true;
  }
}

// Function to validate radio and check boxes
// For radio, ensures that one radio button in a
// series is selected
// For checkbox, ensures that the number selected
// is in the min and under the max
// Variables needed: form name, field name, number
// of items total, minimum items checked, maximum
// items checked
// For radio buttons, the min and max will always
// be 1
function
  RadioCheckBox(Form,Field,length,minReq,maxReq)
{
  // Set the checked var to a default value of 0
  var checked = 0;
  // Loop through the number of items
  for (i=0; i<length; i++) {
    // If an item is checked, increment the
    // checked var
    if (eval("document." + Form + "." + Field + "["
      + i + "].checked")) {
      checked++;
    }
  }
  // If the checked var is between the min and
  // max, return true, otherwise, false
  if (checked < minReq || checked > maxReq) {
    return false;
  } else {
    return true;
  }
}

// Function to validate a date so that the date
// entered must be less than today
// Variables needed: form name, field name
// Don't you wish JavaScript had a DateCompare
// function?
function DateLessThan(Form,Field,type) {
  // Create a var called today with a value of
  // today's date
  var today = new Date();
  // Get the time in milliseconds from the current
  // date
  var todayMS = today.getTime();
  // Get the date value of the form field (this
  // has already been validated as a valid date by
  // CF's form validation'
  var dateValue = eval("document." + Form + "." +
    Field + ".value");
  // Split the date to create an array
  var dateSplit = dateValue.split("/");
  // If the type is 'date', set the month to the
  // first value in the array
  // Subtract 1 from the date because JavaScript
  // uses 0-11 to represent months
  // Set the day of the month to the second value
  // in the array
  if (type == 'date') {
    var month = dateSplit[0] - 1;
    var day = dateSplit[1];
  }
  // If the type is 'eurodate', set the month to
  // the second value in the array
  // Subtract 1 from the date because JavaScript
  // uses 0-11 to represent months
  // Set the day of the month to the first value
  // in the array
  if (type == 'eurodate') {
    var month = dateSplit[1] - 1;
    var day = dateSplit[0];
  }
  // Set the year to the third value in the array
  var year = dateSplit[2];
  // Create a new date object variable to hold the
  // date, passing in the month, day and year
  var dateEntered = new Date(year,month,day,0,0,0);
  // Get the milliseconds from this date
  var dateEnteredMS = dateEntered.getTime();
  // Compare the milliseconds from the current
  // date with those of the date entered.
  // Return false if the date entered is greater
  // than today's date
  if (dateEnteredMS > todayMS) {
    return false;
  } else {
    return true;
  }
}