// Generic start-up handler.
// This function can be used to add events to the 
// Window on-load event.
// Usage: 	addLoadEvent(nameOfSomeFunctionToRunOnPageLoad); 
//			addLoadEvent(function() { 
//	  			more code to run on page load  
//			}); 
function addLoadEvent(func) { 
	var oldonload = window.onload; 
		if (typeof window.onload != 'function') { 
	    	window.onload = func; 
	} else { 
		window.onload = function() { 
			oldonload(); 
			func(); 
		} 
	} 
} 


/* Function: XBrowserAddHandler
* @author: Jim Donnell
* @date: March 2006
* @comments:  XBrowserAddHandler provides a browser agnostic way to add event handlers using the DOM 2
* The code below was originally taken from this page: http://weblogs.asp.net/asmith/archive/2003/10/06/30744.aspx
* I modified it significantly because it didn't work for me using the code and example.
* I also removed the originalHandler part because I didn't think it was important
*/
 
function XBrowserAddHandler(obj,eventName,handlerName) { 
	if ( obj.addEventListener ) {        // Check if Mozilla / W3C Compatible Browser
    	obj.addEventListener(eventName, handlerName, false); // Add the event listener
  	} else if ( obj.attachEvent ) {        // Check if IE
    	obj.attachEvent("on" + eventName, handlerName);   // Add the event listener
  	} else {
   	alert("Sorry, your browser is not supported and may not function correctly.");
  	} 
}
 
/* Function: getCommonObj
* @author: Jim Donnell
* @date: March 2006
* @returns: The object on which the event occurred.
* @comments:  This function coverts the event object into a common object whose attributes can be
* accessed in a browser agnostic "standard" way.
*
* This function should be called from the event handler to convert the event object into a common
* object.
*
* Ex:
* function someEventHandler(evt) {
*  var commonObj = getCommonObj(evt);
*  alert("commonObj.value=" + commonObj.value);
* }  
*/
function getCommonObj(evt){
 	var ieEventName = "srcElement";       // IE event object extension "evt.srcElement"
 	var mozEventName = "target";       // Moz event object extension "evt.target"
 	if(evt[mozEventName]){         // Assign the correct extension and return.
  		return evt[mozEventName];
 	}else{
  		return evt[ieEventName];
 	}
}
 
// Found this function at http://www.degraeve.com/reference/simple-ajax-example.php
// I'm not sure how the "this" part works but it seems too and be pretty clean.
// This is the basic AJAX call functionality.
// @param strURL - The URL of the servlet that will handle the request and return the
//                 results.
// @param queryStr - The query string attributes to pass to the servlet.
// @param handler - The name of the function that will handle the return 
//				            from the servlet.
function xmlhttpPost(strURL, queryStr, handler) {
//	alert("In xmlhttpPost");
    var xmlHttpReq = false;
    var self = this;
    // Mozilla/Safari
    if (window.XMLHttpRequest) {
        self.xmlHttpReq = new XMLHttpRequest();
    }
    // IE
    else if (window.ActiveXObject) {
        self.xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
    }
    self.xmlHttpReq.open('POST', strURL, true);
    self.xmlHttpReq.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    self.xmlHttpReq.onreadystatechange = function() {
        if (self.xmlHttpReq.readyState == 4) {
        	// call the callBack handler
            handler(self.xmlHttpReq.responseText);
        }
    }
    self.xmlHttpReq.send(queryStr);
}


/**
// Get a browser neutral XMLHttpRequest object.
// This commented out because I'm not using it right now
// but it is good example code.
function getXmlHttpObj() {
    var xmlHttpReq;
    // Mozilla/Safari
    if (window.XMLHttpRequest) {
        xmlHttpReqObj = new XMLHttpRequest();
    }
    // IE
    else if (window.ActiveXObject) {
        xmlHttpReqObj = new ActiveXObject("Microsoft.XMLHTTP");
    }
    return xmlHttpReqObj;
}    
*/

// ***************************************************************************************
// Search Table Functions
// ***************************************************************************************


/**
 * This array is used to remember mark status of rows in browse mode
 */
var marked_row = new Array;


/**
 * enables highlight and marking of rows in data tables
 *
 */
function markRowsInit() {
// alert("In markRowsInit!");
    // for every table row ...
	var rows = document.getElementsByTagName('tr');
	for ( var i = 0; i < rows.length; i++ ) {
	    // ... with the class 'odd' or 'even' ...
		if ( 'odd' != rows[i].className && 'even' != rows[i].className ) {
		    continue;
		}
	    // ... add event listeners ...
        // ... to highlight the row on mouseover ...
	    if ( navigator.appName == 'Microsoft Internet Explorer' ) {
	        // but only for IE, other browsers are handled by :hover in css
			rows[i].onmouseover = function() {
			    this.className += ' hover';
			}
			rows[i].onmouseout = function() {
			    this.className = this.className.replace( ' hover', '' );
			}
	    }
        // ... and to mark the row on click ...
		rows[i].onmousedown = function() {
		// alert("Mouse down on row " + i);
		    var unique_id;
            var checkbox;

            checkbox = this.getElementsByTagName( 'input' )[0];
            if ( checkbox && checkbox.type == 'checkbox' ) {
                unique_id = checkbox.name + checkbox.value;
            } else if ( this.id.length > 0 ) {
                unique_id = this.id;
            } else {
		        return;
		    }

            if ( typeof(marked_row[unique_id]) == 'undefined' || !marked_row[unique_id] ) {
                marked_row[unique_id] = true;
            } else {
                marked_row[unique_id] = false;
            }

            if ( marked_row[unique_id] ) {
			    this.className += ' marked';
            } else {
			    this.className = this.className.replace(' marked', '');
            }

            if ( checkbox && checkbox.disabled == false ) {
                checkbox.checked = marked_row[unique_id];
            }
		}

		// ... and disable label ...
		var labeltag = rows[i].getElementsByTagName('label')[0];
		if ( labeltag ) {
		    labeltag.onclick = function() {
		        return false;
		    }
	    }
	    // .. and checkbox clicks
		var checkbox = rows[i].getElementsByTagName('input')[0];
		if ( checkbox ) {
		    checkbox.onclick = function() {
		        // opera does not recognize return false;
		        this.checked = ! this.checked;
		    }
	    }
	}
}

/**
 * marks all rows and selects its first checkbox inside the given element
 * the given element is usaly a table or a div containing the table or tables
 *
 * @param    container    DOM element
 */
function markAllRows( container_id ) {
	var rows = document.getElementById(container_id).getElementsByTagName('tr');
    var unique_id;
    var checkbox;

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

        checkbox = rows[i].getElementsByTagName( 'input' )[0];

        if ( checkbox && checkbox.type == 'checkbox' ) {
            unique_id = checkbox.name + checkbox.value;
            if ( checkbox.disabled == false ) {
                checkbox.checked = true;
                if ( typeof(marked_row[unique_id]) == 'undefined' || !marked_row[unique_id] ) {
                    rows[i].className += ' marked';
                    marked_row[unique_id] = true;
                }
            }
	    }
	}

	return true;
}

/**
 * marks all rows and selects its first checkbox inside the given element
 * the given element is usaly a table or a div containing the table or tables
 *
 * @param    container    DOM element
 */
function unMarkAllRows( container_id ) {
	var rows = document.getElementById(container_id).getElementsByTagName('tr');
    var unique_id;
    var checkbox;

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

        checkbox = rows[i].getElementsByTagName( 'input' )[0];

        if ( checkbox && checkbox.type == 'checkbox' ) {
            unique_id = checkbox.name + checkbox.value;
            checkbox.checked = false;
            rows[i].className = rows[i].className.replace(' marked', '');
            marked_row[unique_id] = false;
        }
	}

	return true;
}