/** Used by AbstractAJAXCall. Depends on text of $GSEERROR_PREFIX not changing. **/

/**
 * 08-Feb-21: Stop caching httpObjects. It breaks outoload of first tab in TabbedDivElement.
 * 08-Dec-08: New getHTTPObjectForKey to handle IE7.
 * 09-Feb-14: Add handlePublishError.
 * 09-May-22: Add isEnterKeyPressed.
 * 09-Jul-09: Add null guard in showAJAXIndicator.
 * 09-Dec-06: Add another null guard in showAJAXIndicator.
 *
 */
 
	var ajaxIndicatorsArray = new Array(); // see showAJAXIndicator
     
     /// NO WORK AT ALL
    function new_getHTTPObjectForKey(key) {
    	// These are in order of decreasing likelihood; this will change in time.
     	var _PROGIDS = ['Msxml2.XMLHTTP', 'Microsoft.XMLHTTP', 'Msxml2.XMLHTTP.4.0'];
        var http = null;
        var last_e = null;
        try { http = new XMLHttpRequest(); } 
        catch(e) {
        	for(var i=0; i<3; i++){
                try {http = new ActiveXObject(_PROGIDS[i]);} catch(e) {last_e = e;}
                if(http) {
                    break;
                }
             }
        }
        if(!http) {return null; } // error!!
        return http;
     }

	function getHTTPObjectForKey(key) {
		var xmlhttp; 
		/*@cc_on 
		@if (@_jscript_version >= 5)
			try { 
				xmlhttp = new ActiveXObject("Msxml2.XMLHTTP"); 
			} catch (e) { 
				try { 
					xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); 
				} catch (E) { 
					xmlhttp = false; 
				} 
			} 
		@else xmlhttp = false; 
		@end @*/
	
		if (!xmlhttp && typeof XMLHttpRequest != 'undefined') { 
			try { 
				xmlhttp = new XMLHttpRequest(); 
			} catch (e) { 
				xmlhttp = false; 
			} 
		}
		return xmlhttp; 
	}
	
	
	function makeAjaxCallForKeyPageParams(key, handlerClass, url, paramsCall, callback, obj, onErrorDo) {
		var fnName = paramsCall.toString();
		fnName = fnName.substring(8); // get rid of "function"
		fnName = fnName.substring(0, fnName.indexOf('('));
		fnName = fnName.replace(/^\s*/, "").replace(/\s*$/, "");
		showAJAXIndicator(fnName, true);
		var http = getHTTPObjectForKey(key);
		var params = paramsCall();
		params += "&ajax_handler=" + key;
		if(handlerClass != null) {
			params += "&controller_class=" + handlerClass;
		}
		http.open("POST", url, true);
		http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
		// the line below can cause problems with safari
		//http.setRequestHeader("Content-length", params.length);
		http.setRequestHeader("Connection", "close");
		http.onreadystatechange = function() {
			if(http.readyState == 4) {
				if(http.status == 200) {
					if(http.responseText.startsWith("##ERR:")) {
						ajaxHandleError(http, obj, onErrorDo, http.responseText);
					} else {
						callback(http.responseText);
					}
				} else {
				//	ajaxHandleError(http, obj, onErrorDo);
				}
			}
		}
		http.send(params);
	}

	function ajaxHandleError(http, obj, onErrorDo, responseText) {
		showAJAXIndicator("ajax", false); // on error, hide all indicators
		if(onErrorDo == null) {
			reportAJAXError(http.status, obj, responseText);
		} else {
			onErrorDo(http.status, obj, responseText);
		}
	}

	function reportAJAXError(status, obj, responseText) {
		var s;
		if(responseText == undefined) {
			s = "A communications error occurred: " + status;
		} else {
			s = responseText.substr(6);
		}
		window.alert(s);
	}
	
	/**
	 * Uses CSS to display the existing img with the id of prefix + '_img', or to
	 * hide any already displayed img that begins with prefix. Thus if you kick
	 * off an AJAX process with the same prefix as an already running process,
	 * when either of them finishes, both indicators will be turned off. This is
	 * a shortcoming of using this technique that will be addressed in a future
	 * release.
	 */
	function showAJAXIndicator(prefix, show) {
		if(show) {
			var indID = prefix + '_img';
			ajaxIndicatorsArray.push(indID);
			var ind = $(indID);
			if(ind != null) $(indID).className = 'displayed';
		} else {
			var indArray = ajaxIndicatorsArray.slice();
			var i, j, s;
			for(i = 0; i<indArray.length; i++) {
				s = indArray[i];
				if(s.indexOf(prefix) == 0 && (c = $(s)) != null) {
					c.className = 'nodisplay';
					for(j=0; j<ajaxIndicatorsArray.length; j++) {
	   					if(s == ajaxIndicatorsArray[j]) {
	   						ajaxIndicatorsArray.splice(j, 1);
	   						break;
	   					}
	   				}
				}
			}
		}
	}
	
	function getAJAXParamsForFields(fields, params) {
		var i;
		for(i = 0; i < fields.length; i++) {
			params += fields[i] + "=" + escape(document.getElementById(fields[i]).value);
			if(i < (fields.length - 1)) {
				params += "&";
			}
		}
		return params + "";
	}
		
	// callbacks
	
	function updateDiv(responseText, divID) {
		var div = $(divID);
		div.innerHTML = responseText;
		copyScriptsToHeadFrom(divID);
	}
		
	// utility function
	function copyScriptsToHeadFrom(divID) {
		var scripts = $(divID).getElementsByTagName("script");
		var scriptText = "";
		for(var i = 0; i < scripts.length; i++) {
			scriptText += scripts[i].text;
		}
		var e = document.createElement("script");
		e.text = scriptText;
		e.type="text/javascript";
		document.getElementsByTagName("head")[0].appendChild(e);
	} 
	
	// custom errors
	
	function handlePublishError(status, obj, responseText) {
		reportAJAXError(status, obj, responseText);
		$('viewable').checked = false;
	}
	
	// use for triggering on enter/return key press
	function isEnterKeyPressed(e) {
		var keycode;
		if (window.event) 
			keycode = window.event.keyCode;
		else if (e) keycode = e.which; else return false;
		return (keycode == 13);
	}