//===========================================================================
// script/Doc__js.php
//===========================================================================
/**/

//add chkBackspace() to keydown event.
//...........................................................................
if( typeof document.addEventListener != "undefined" )
{ document.addEventListener( "keydown", chkBackspace, false ); }
else {
  if( typeof document.attachEvent != "undefined" )
  { document.attachEvent( "onkeydown", chkBackspace ); }
  else {
    if( document.onkeydown != null ) {
      var prv = document.onkeydown;
      document.onkeydown = function( e )
      { prv( e ); chkBackspace( e ); }
    }
    else { document.onkeydown = chkBackspace; }
  }
}
//===========================================================================
/** Supress backspace browser default. */
function chkBackspace( e )
/* Called by all keydown actions. */
{
  e = ( e ) ? e : window.event;
  var t = ( e.target ) ? e.target : ( e.srcElement ) ? e.srcElement : null;
  if( t && t.tagName
      && ( t.type && /(password)|(text)|(file)/.test(t.type.toLowerCase())
           && t.readOnly == false )
      || t.tagName.toLowerCase() == "textarea" && t.readOnly == false )
  { return true; } //allow.
  var k = ( e.keyCode ) ? e.keyCode : ( e.which ) ? e.which : null;
  if( k == 8 ) {
    if( e.preventDefault ) { e.preventDefault(); }
    return false; //supress.
  }
  return true; //allow.
}
//===========================================================================
/**
* UTF-8 encodes special characters for URL argument. Returns empty string
* when given NULL.
*/
function encodeURL( arg )
/* Known Issue: converts "*" to "**". */
{
  if( typeof( arg ) !== "string" && arg !== null ) {
    throw new TypeError( "Invalid Parameter" );
  }
  if( arg !== null ) {
    arg = arg.replace( new RegExp( "\#", "g" ),   "%23" );
    arg = arg.replace( new RegExp( "\&", "g" ),   "%26" );
    arg = arg.replace( new RegExp( "\\+", "g" ), "%2B" );
    arg = arg.replace( new RegExp( "\\?", "g" ), "%3F" );
  }
  return ( arg !== null ) ? arg : "";
}
//===========================================================================
/** Returns value of given argument in given URL. */
function getArg( url, arg )
/**/
{
  arg += "="; var val = null;
  start = url.indexOf( arg );
  if( url.indexOf( arg ) == -1 ) { url += "&" +arg +val; }
  else {
    start = url.indexOf( arg ) +arg.length;
    stop  = url.indexOf( "&", start );
    if( stop == -1 ) { stop = url.length; }
    val = url.substring( start, stop );
  }
  return val;
}
//===========================================================================
/** Replaces URL argument value and returns modified URL. */
function rplArg( url, arg, val )
/**/
{
  arg += "=";
  start = url.indexOf( arg );
  if( url.indexOf( arg ) == -1 ) { url += "&" +arg +val; }
  else {
    start = url.indexOf( arg ) +arg.length;
    stop  = url.indexOf( "&", start );
    if( stop == -1 ) { stop = url.length; }
    url = url.replace
      ( new RegExp( arg +url.substring( start, stop ), "i" )
      , arg +val
      );
  }
  return url;
}
//===========================================================================
/**
* Reformats form-data array into seperated string and prevents array submit.
* Default seperation: "," (comma).
*/
function arrToStr( form, arrayName, seperator )
/* Called by other functions. */
{
  var str = "";
  if ( seperator == null || seperator == "" ) { seperator = ","; }
  for (var i=0; i < form.elements.length; i++) {
    if ( form.elements[i].name == arrayName +"[]"
        && form.elements[i].checked ) {
      
      if ( str != "" ) { str = str + seperator; }
      str = str + form.elements[i].value;
      form.elements[i].checked = false; //removes variable from submit.
    }
  }
  return str;
}
//===========================================================================
/** Checks for any selected checkboxes in from. */
function hasSelected( form )
/* Called by other functions. */
{
  var is = false;
  for (var i=0; i < form.elements.length; i++) {
    if ( form.elements[i].type == "checkbox" ) {
      if ( form.elements[i].checked ) { is = true; }
    }
  }
  return is;
}
//===========================================================================
/** Toggels all form checkboxes. */
function toggelAll( form )
/* Called by check-all control in studentList. */
{
  for (var i=0; i < form.elements.length; i++) {
    if ( form.elements[i].type == "checkbox" ) {
      if ( ! form.elements[i].checked ) { form.elements[i].checked = true; }
      else { form.elements[i].checked = false; }
    }
  }
}
//===========================================================================
/** Fires cross-browser-compatible onclick-event from given element. */
function fireOnclick( element, isIE )
/* Called by other functions. */
{
  if( isIE ) { element.fireEvent( "onclick" ); } //submit.
  else {
    var tEvent = window.document.createEvent( "MouseEvent" ); 
    tEvent.initEvent( "click", false, true ); 
    element.dispatchEvent( tEvent ); 
  }
}
//===========================================================================
/** ... */
function addOption( element, text, value )
/**/
{
  t = document.createElement( "OPTION" );
  t.text = text; t.value = value;
  element.options.add( t );
}
//===========================================================================
/** ... */
function selOption( element, value )
/**/
{
  r = false;
  for(i=1; i < element.options.length; i++) {
    if( element.options[i].value == value )
    { element.selectedIndex = i; r = true; break; }
  }return r;
}
//===========================================================================
/** ... */
function clrOption( element )/**/
{ for(var i=element.options.length-1; i >= 0; i--) { element.remove( i ); } }
//===========================================================================
/** Trims whitespace from beginning and ending of string. */
String.prototype.trim = function()/**/
{ return this.replace( /^\s+|\s+$/g, "" ); }
//===========================================================================
//===========================================================================
// END script/Doc__js.php
//===========================================================================
//===========================================================================
// script/Form__js.php
//===========================================================================
/**/

//===========================================================================
// Form (abstract class)
//===========================================================================
/** Constructor -- UI behavior. */
function Form( id ) {
/* FireFox Bug: .focus() non-functioning. */

this.UNA  = "Unknown event: "; //action error.
this.UNS  = "Unknown id: ";    //source error.

this.isIE = false; //event flag.
this.form = document.getElementById( id );  
this.parent = this; //inherited reference.
  
//===========================================================================
/** Performs execution. Calls action-event methods. */
Form.prototype.run = function( event, data )
/**/
{
  var r = true;
  var action; var source;
  if( window.event ) { event = window.event; this.isIE = true; }
  
  if( this.isIE ) {
    action = event.type;
    source = ( event.srcElement != null ) ? event.srcElement.id : null;
  }
  else if( event ) {
    action = event.type;
    source = ( event.target != null ) ? event.target.id : null;
  }
  switch ( action ) {
    case "load":   r = this.onLoad( source, data );   break;
    case "focus":  r = this.onFocus( source, data );  break;
    case "blur":   r = this.onBlur( source, data );   break;
    case "click":  r = this.onClick( source, data );  break;
    case "change": r = this.onChange( source, data ); break;
    case "keypress":
      var key = ( this.isIE ) ? event.keyCode : event.which;
      r = this.onKeypress( source, data, key );
      break;
    default: alert( this.UNA+action ); //alert!
  }
  return r;
}
//===========================================================================
/** OnLoad action-event. */
Form.prototype.onLoad = function( source, data )/**/
{ return true; } //do-nothing.
//===========================================================================
/** OnFocus action-event. */
Form.prototype.onFocus = function( source, data )
/**/
{
  var r = true;
  switch( source ) {
    //case this.???.id: break;
    default: alert( this.UNS+source ); //alert!
  }
  return r;
}
//===========================================================================
/** OnFocus action-event. */
Form.prototype.onBlur = function( source, data )
/**/
{
  var r = true;
  switch( source ) {
    //case this.???.id: break;
    default: alert( this.UNS+source ); //alert!
  }
  return r;
}
//===========================================================================
/** OnClick action-event. */
Form.prototype.onClick = function( source, data )
/**/
{
  var r = true;
  switch( source ) {
    //case this.???.id: break;    
    default: alert( this.UNS+source ); //alert!
  }
  return r;
}
//===========================================================================
/** OnChange action-event. */
Form.prototype.onChange = function( source, data )
/**/
{
  var r = true;
  switch( source ) {
    //case this.???.id: break;
    default: alert( this.UNS+source ); //alert!
  }
  return r;
}
//===========================================================================
/** OnKeypress action-event. */
Form.prototype.onKeypress = function( source, data, key )
/**/
{
  var r = true;
  switch( key ) {
    case 13: r = this.keyEnter( source, data ); break; //enter-key.
    default: //do-nothing.
  }
  return r;
}
//===========================================================================
/** Enter-key event. */
Form.prototype.keyEnter = function( source, data )
/**/
{
  var r = false; //FALSE suppresses form-auto-submit.
  switch( source ) {
    //case this.???.id: break;
    default: alert( this.UNS+source ); //alert!
  }
  return r;
}
//===========================================================================
} // END Form
//===========================================================================
//===========================================================================
// DateGroup
//===========================================================================
/** ... */
function DateGroup() {
/* defines methods only. */

this.parent = this; //inherited reference.
//===========================================================================
/** ... */
DateGroup.prototype.init = function( cur, y, m, d )
/**/
{
  this.MONTH = new Array
    ( "Jan", "Feb", "Mar", "Apr", "May", "Jun"
    , "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
    );
  this.cur = ( cur ) ? cur : null;
  this.y = ( y ) ? document.getElementById( y ) : null;
  this.m = ( m ) ? document.getElementById( m ) : null;
  this.d = ( d ) ? document.getElementById( d ) : null;
  this.setMin(); this.setMax(); this.setSel();
  if( ! this.sel ) { this.setY(); this.setM(); this.setD(); }
}
//===========================================================================
/** ... */
DateGroup.prototype.isSel = function()/**/
{ return ( this.hasY() && this.hasM() && this.hasD() ) ? true : false; }
//===========================================================================
/** ... */
DateGroup.prototype.hasY = function()/**/
{ return ( this.y.selectedIndex > 0 ) ? true : false; }
//===========================================================================
/** ... */
DateGroup.prototype.getY = function( i )/**/
{ return ( i != undefined ) ? this.y.options[i].value : this.y.value; }
//===========================================================================
/** ... */
DateGroup.prototype.hasM = function()/**/
{ return ( this.m.selectedIndex > 0 ) ? true : false; }
//===========================================================================
/** ... */
DateGroup.prototype.getM = function( i )/**/
{ return ( i != undefined ) ? this.m.options[i].value -1 : this.m.value -1; }
//===========================================================================
/** ... */
DateGroup.prototype.hasD = function()/**/
{ return ( this.d.selectedIndex > 0 ) ? true : false; }
//===========================================================================
/** ... */
DateGroup.prototype.getD = function( i )/**/
{ return ( i != undefined ) ? this.d.options[i].value : this.d.value; }
//===========================================================================
/** ... */
DateGroup.prototype.setSel = function()
/**/
{
  if( this.isSel() ) {
    //set one month ahead then set to last day of preceeding month.
    last = new Date( this.getY(), this.getM() +1, 0 );
    this.sel = ( this.getD() > last.getDate() )
        ? new Date( this.getY(), this.getM(), 1 ) //prevents day overflow.
        : new Date( this.getY(), this.getM(), this.getD() );
  }else { this.sel = null; }
}
//===========================================================================
/** ... */
DateGroup.prototype.setMin = function()/**/
{ this.min = ( this.cur ) ? new Date( this.cur.getFullYear()
  , this.cur.getMonth(), this.cur.getDate() ) : null; }
//===========================================================================
/** ... */
DateGroup.prototype.setMax = function()
/**/
{
  if( this.min ) {
    //set one month ahead then set to last day of preceeding month.
    last = new Date( this.min.getFullYear() +1, this.min.getMonth() +1, 0 );
    this.max = ( this.min.getDate() > last.getDate() )
          //handles day overflow.
        ? new Date( this.min.getFullYear() +1, this.min.getMonth() +1
            , this.min.getDate() )
        : new Date( this.min.getFullYear() +1, this.min.getMonth()
            , this.min.getDate() );
  }else { this.max = null; }
}
//===========================================================================
/** ... */
DateGroup.prototype.edit = function( src )
/**/
{
  i = -1;
  switch( src ) {
    case this.y.id: i = this.y.selectedIndex; break;
    case this.m.id: i = this.m.selectedIndex; break;
    case this.d.id: i = this.d.selectedIndex; break;
  }
  if( i < 1 ) {
    this.clear( this.d );
    this.d.selectedIndex = 0;
    this.m.selectedIndex = 0;
    this.y.selectedIndex = 0;
  }
  else {
    if( ! this.hasY() ) { this.y.selectedIndex++; }
    if( ! this.hasM() ) { this.m.selectedIndex++; }
    if( src != this.d.id ) { this.setD(); }
    if( ! this.hasD() ) { this.d.selectedIndex++; }
    
    //selected date.
    this.setSel();
    
    //verify date.
    this.chk( src );
  }
}
//===========================================================================
/** ... */
DateGroup.prototype.chk = function( src )
/**/
{
  //below minimum.
  if( this.sel.getTime() < this.min.getTime() ) {
    
    switch( src ) {
      
      //year.
      case this.y.id:
        if( this.sel.getMonth() == this.min.getMonth() ) {
          
          //edit day.
          selOption( this.d, this.min.getDate() );
          this.edit( this.d.id );
        }
        else {
          
          //edit month.
          selOption( this.m, this.min.getMonth() + 1 );
          this.edit( this.m.id );
        }
        break;
      
      //month.
      case this.m.id:
        if( this.sel.getMonth() == this.min.getMonth() ) {
          
          //edit year.
          if( selOption( this.y, this.min.getFullYear() +1 ) ) {
            this.edit( this.y.id );
          }
          else {
            
            //edit day.
            selOption( this.d, this.min.getDate() );
            this.edit( this.d.id );
          }
        }
        else {
          
          //edit year.
          if( selOption( this.y, this.min.getFullYear() +1 ) ) {
            this.edit( this.y.id );
          }
          else {
            
            //edit month.
            selOption( this.m, this.min.getMonth() + 1 );
            this.edit( this.m.id );
          }
        }
        break;
      
      default: //do-nothing.
    }
  }
  //above maximum.
  if( this.sel.getTime() > this.max.getTime() ) {
    
    switch( src ) {
      
      //year.
      case this.y.id:
        if( this.sel.getMonth() == this.max.getMonth() ) {
          
          //edit day.
          selOption( this.d, this.max.getDate() );
          this.edit( this.d.id );
        }
        else {
          
          //edit month.
          selOption( this.m, this.max.getMonth() + 1 );
          this.edit( this.m.id );
        }
        break;
      
      //month.
      case this.m.id:
        if( this.sel.getMonth() == this.max.getMonth() ) {
          
          //edit year.
          if( selOption( this.y, this.max.getFullYear() -1 ) ) {
            this.edit( this.y.id );
          }
          else {
            
            //edit day.
            selOption( this.d, this.max.getDate() );
            this.edit( this.d.id );
          }
        }
        else {
          
          //edit year.
          if( selOption( this.y, this.max.getFullYear() -1 ) ) {
            this.edit( this.y.id );
          }
          else {
            
            //edit month.
            selOption( this.m, this.max.getMonth() + 1 );
            this.edit( this.m.id );
          }
        }
        break;
      
      default: //do-nothing.
    }
  }
}
//===========================================================================
/** ... */
DateGroup.prototype.setY = function()
/**/
{
  prv = this.getY(); this.clear( this.y );
  if( this.min && this.max ) {
    for(i=this.min.getFullYear(); i <= this.max.getFullYear(); i++)
    { addOption( this.y, i, i ); }
  }
  //select year.
  if( this.sel ) { selOption( this.y, this.sel.getFullYear() ); }
  else { selOption( this.y, prv ); }
}
//===========================================================================
/** ... */
DateGroup.prototype.setM = function()
/**/
{
  prv = this.getM()+1; this.clear( this.m );
  if( this.min ) {
    for(i=0; i < this.MONTH.length; i++)
    { addOption( this.m, this.MONTH[i], i+1 ); }
  }
  //select month.
  if( this.sel ) { selOption( this.m, this.sel.getMonth() +1 ); }
  else { selOption( this.m, prv ); }
}
//===========================================================================
/** ... */
DateGroup.prototype.setD = function()
/**/
{
  prv = this.getD(); this.clear( this.d );
  if( this.min && this.hasY() && this.hasM() ) {
    first = ( this.getY() == this.min.getFullYear()
        && this.getM() == this.min.getMonth() )
        ? this.min.getDate() //minimum day.
        : 1;
    //set one month ahead then set to last day of preceeding month.
    last = new Date( this.getY(), this.getM() +1, 0 );
    limit = ( this.getY() == this.max.getFullYear()
        && this.getM() == this.max.getMonth() )
        ? this.max.getDate() : last.getDate();
    for(i=first; i <= limit; i++) { addOption( this.d, i, i ); }    
  }
  //select day.
  if( this.sel ) { selOption( this.d, this.sel.getDate() ); }
  else { selOption( this.d, prv ); }
}
//===========================================================================
/** ... */
DateGroup.prototype.clear = function( element )/**/
{ for(var i=element.options.length-1; i > 0; i--) { element.remove( i ); } }
//===========================================================================
} // END DateGroup
//===========================================================================
//===========================================================================
// END script/Form__js.php
//===========================================================================
//===========================================================================
// script/Nav__js.php
//===========================================================================
/**/

//===========================================================================
/** Receives selector id, desired state (true/false), & toggles indicator. */
function navSelect( id, state )
/* offset background-image is visible/invisible by toggling repeat value. */
{
  var x = document.getElementById( id );
  if( state ) { x.style.backgroundRepeat = "repeat-x"; }
  else        { x.style.backgroundRepeat = "no-repeat"; }
}

//===========================================================================
// END script/Nav__js.php
//===========================================================================