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"use strict"; /*jslint node: true */ /*jshint esversion: 6 */
// js/updateHTMLelement.js
// Functions to perform XMLHttpRequests.
// Last Updated 2018-03-13. Updated function and variable names. Updated comments. By Jim Martinson.
// UpdateAutoOff(thisURL, elementId) ................................... Turn off the timer. It will also load the thisURL output into the elementId innerHTML if they are given.
// UpdateAutoOn(thisURL, elementId, timer, preloadText, jsReturnCode) .. Turn on the timer and load thisURL output into elementId.innerHTML every timer milliseconds.
// UpdateInclude(thisURL, elementId, preloadText, jsReturnCode) ........ Load thisURL output into elementId innerHTML. The timer is not used (nor changed!).
// URLget(thisURL, elementId) .......................................... Execute the thisURL page. Page output is stored in the elementId innerHTML.
// Update__Auto(timer) ................................................. Load the UpdateAutoURL output into the UpdateAutoDOMid innerHTML.
// Update__AutoStatus(setStatus) ....................................... Turn the UpdateAutoFlag on or off.
// Update__GetHTTPObject() ............................................. Returns a new XMLHttpRequest().
var UpdateAutoFlag = false; // The flag to determine if the setTimeout() is triggered for timed XMLHttpRequests.
var UpdateAutoDOMid = ''; // The id of the DOM element that receives the XMLHttpRequest responseText.
var UpdateAutoTimer = 0; // The time delay for the window.setTimeout. Set in Update__Auto();
var UpdateAutoURL = ''; // The URL for the XMLHttpRequest call.
var UpdateDOMelement = null; // The DOM element innerHTML that will receive the XMLHttpRequest responseText.
var UpdateLoadingText = ''; // The text to preload into UpdateDOMelement.innerHTML before the XMLHttpRequest call.
var UpdateReloadCount = 0; // Keep a count of XMLHttpRequest reloads.
var UpdateReturnCode = false; // The js code to run when the XMLHttpRequest returns status === 200. Does eval(UpdateReturnCode).
var UpdateSetTimeout = false; // The setTimeout call for use by clearTimeout(UpdateSetTimeout).
var URI; // URI for UpdateInclude() calls.
var XMLHttpRequestObject; // The XMLHttpRequest object.
// UpdateAutoOff(thisURL, elementId)
// Turn off the timer. It will also load the thisURL output into the elementId innerHTML if they are given.
// thisURL = The URL to load.
// elementId = The HTML element Id.
function UpdateAutoOff(thisURL, elementId) {
let DEBUG_UpdateAutoOff = false; // false = DEBUG off, true = DEBUG on.
if ( DEBUG_UpdateAutoOff ) { alert("UpdateAutoOff("+thisURL+","+elementId+") UpdateAutoFlag="+UpdateAutoFlag); }
Update__AutoStatus('off');
if ( UpdateSetTimeout ) {
clearTimeout(UpdateSetTimeout);
UpdateSetTimeout = false;
}
if ( ( typeof thisURL !== 'undefined' ) && ( typeof elementId !== 'undefined' ) ) { UpdateInclude(thisURL, elementId); }
} // END UpdateAutoOff.
// UpdateAutoOn(thisURL, elementId, timer, preloadText, jsReturnCode)
// Turn on the timer and load thisURL output into elementId.innerHTML every timer milliseconds.
// thisURL = The URL to call with the XMLHttpRequest.
// elementId = The DOM element id that receives the XMLHttpRequest responseText.
// If this is false or blank then XMLHttpRequest responseText is not stored in a DOM element.
// timer = The millisecond delay between reloading the file into the HTML element.
// preloadText = The text to display in DOM element innerHTML before the XMLHttpRequest call.
// If undefined use UpdateLoadingText as string below.
// If string, preload the DOM element innerHTML with 'Loading string ...'.
// If false, do not preload the DOM element innerHTML.
// jsReturnCode = The js code to run when the XMLHttpRequest returns status === 200. Does eval(jsReturnCode).
function UpdateAutoOn(thisURL, elementId, timer, preloadText, jsReturnCode) {
let DEBUG_UpdateAutoOn = false;
if ( DEBUG_UpdateAutoOn ) { console.warn('UpdateAutoOn[thisURL='+thisURL+', elementId='+elementId+', timer='+timer+', preloadText='+preloadText+', jsReturnCode='+jsReturnCode+']'); }
//alert("UpdateAutoOn ("+thisURL+", "+elementId+", "+timer+", "+preloadText+", "+jsReturnCode);
if ( typeof jsReturnCode !== 'undefined' ) {
UpdateReturnCode = jsReturnCode;
if ( DEBUG_UpdateAutoOn ) { console.info('58 UpdateReturnCode changed to '+UpdateReturnCode); }
} else {
UpdateReturnCode = false;
if ( DEBUG_UpdateAutoOn ) { console.info('61 UpdateReturnCode changed to false'); }
}
//alert('UpdateReturnCode='+UpdateReturnCode);
UpdateLoadingText = preloadText;
Update__AutoStatus('on');
if (thisURL !== null) {
UpdateAutoURL = thisURL;
UpdateAutoDOMid = elementId;
}
Update__Auto(timer);
} // END UpdateAutoOn.
// UpdateInclude(thisURL, elementId, preloadText, jsReturnCode)
// Load thisURL output into elementId innerHTML. The timer is not used (nor changed!).
// thisURL = The URL to call with the XMLHttpRequest.
// elementId = The DOM element id that receives the XMLHttpRequest responseText.
// If this is false or blank then XMLHttpRequest responseText is not stored in a DOM element.
// preloadText = The text to display in DOM element innerHTML before the XMLHttpRequest call.
// If undefined use UpdateLoadingText as string below.
// If string, preload the DOM element innerHTML with 'Loading string ...'.
// If false, do not preload the DOM element innerHTML.
// jsReturnCode = The js code to run when the XMLHttpRequest returns status === 200. Does eval(jsReturnCode).
function UpdateInclude(thisURL, elementId, preloadText, jsReturnCode) {
let DEBUG = DEBUG_ON;
if ( DEBUG ) { console.warn('UpdateInclude[thisURL='+thisURL+', elementId='+elementId+', preloadText='+preloadText+', jsReturnCode='+jsReturnCode+']'); }
if ( ( typeof thisURL === 'undefined' ) || thisURL === '' ) { thisURL = false; }
if ( thisURL ) {
if ( typeof elementId === 'undefined' || elementId === '' ) { elementId = false; }
if ( typeof preloadText === 'undefined' ) { preloadText = UpdateLoadingText; }
if ( DEBUG ) { console.info('UpdateReturnCode='+UpdateReturnCode); }
if ( typeof jsReturnCode !== 'undefined' ) {
UpdateReturnCode = jsReturnCode;
if ( DEBUG ) { console.info('UpdateReturnCode changed to '+UpdateReturnCode); }
}
// Display the UpdateInclude() call with arguments.
var queryChar = '&';
if ( thisURL.indexOf('?') === -1 ) { queryChar = '?'; }
/** / // this code in unused and should be removed - jfm 2022-03-17
var UpdateReturnCodeText;
if ( UpdateReturnCode !== true && UpdateReturnCode !== false ) {
UpdateReturnCodeText = "'"+UpdateReturnCode+"'";
} else {
UpdateReturnCodeText = UpdateReturnCode;
}
/**/
console.log(PC+"UpdateInclude['"+window.location.protocol+'//'+window.location.hostname+thisURL+queryChar+'DEBUG=true'+"', '"+elementId+"', '"+preloadText+"', "+UpdateReturnCode+"];",CU);
if ( arguments.length !== 0 ) { // Was UpdateInclude called with arguments?
if ( elementId ) { UpdateDOMelement = document.getElementById(elementId); }
if ( UpdateReloadCount === 0 ) {
if ( elementId ) {
if ( preloadText !== false ) {
UpdateDOMelement.innerHTML = '<em class="info bold">Loading '+preloadText+' ...</em>';
} else {
UpdateDOMelement.innerHTML = '';
}
}
}
UpdateReloadCount++;
XMLHttpRequestObject = Update__GetHTTPObject(); // new XMLHttpRequest();
XMLHttpRequestObject.open("GET", thisURL);
XMLHttpRequestObject.onreadystatechange = function() {
if ( DEBUG ) { console.log(`${PC}XMLHttpRequestObject.readyState=${XMLHttpRequestObject.readyState} status=${XMLHttpRequestObject.status} UpdateReturnCode=${UpdateReturnCode}`,CA); }
if ( XMLHttpRequestObject.readyState === 4 && XMLHttpRequestObject.status === 200 ) { // Do we have a OK responst?
// Yes.
if ( elementId && UpdateDOMelement ) { UpdateDOMelement.innerHTML = XMLHttpRequestObject.responseText; }
if ( UpdateReturnCode ) {
if ( DEBUG ) { console.log('eval['+UpdateReturnCode+'];'); }
jsReturnCode = UpdateReturnCode;
UpdateReturnCode = false; // Set to false to clear UpdateReturnCode.
if ( DEBUG ) { console.info('120 UpdateReturnCode changed to false'); }
eval(jsReturnCode);
}
} else {
// No.
} // Do we have a OK responst?
};
XMLHttpRequestObject.send(null);
} else { // Was UpdateInclude called with arguments?
console.warn(PC+'ERROR: arguments.length === 0',CE);
} // Was UpdateInclude called with arguments?
} else {
console.warn(PC+"thisURL === ''",CE);
}
} // END UpdateInclude.
// URLget(thisURL, elementId)
// Execute the thisURL page. Page output stored in the elementId div.
// I tried it without UpdateDOMelement.innerHTML = XMLHttpRequestObject.responseText; but got uneven results.
function URLget(thisURL, elementId) {
var DEBUG = DEBUG_ON;
if ( DEBUG ) { console.group(`${PC}URLget[thisURL=${thisURL} elementId=${elementId}]`,CG); }//Collapsed
if (thisURL !== undefined && thisURL !== '') {
if (arguments.length !== 0) {
XMLHttpRequestObject = Update__GetHTTPObject(); // Get a new XMLHttpRequest().
XMLHttpRequestObject.open("GET", thisURL); // GET thisURL asynchronously.
XMLHttpRequestObject.onreadystatechange = function() {
if (XMLHttpRequestObject.readyState === 4 && XMLHttpRequestObject.status === 200) {
if ( elementId !== 'undefined' && elementId !== '' && document.getElementById(elementId) ) {
var UpdateDOMelement = document.getElementById(elementId);
UpdateDOMelement.innerHTML = XMLHttpRequestObject.responseText;
} else {
console.warn('Element '+elementId+' does not exist.');
}
}
};
XMLHttpRequestObject.send(null);
}
}
if ( DEBUG ) { console.groupEnd(); }
} // END URLget.
// Update__Auto(timer)
// Load the UpdateAutoURL output into the UpdateAutoDOMid innerHTML.
// This must only be called from UpdateAutoOn().
// timer = The millisecond delay between reloading the UpdateAutoURL output into the UpdateAutoDOMid innerHTML.
function Update__Auto(timer) {
if ( typeof timer !== 'undefined' ) { UpdateAutoTimer = timer; } else { UpdateAutoTimer = 10000; }
UpdateInclude(UpdateAutoURL, UpdateAutoDOMid); // Load thisURL output into elementId innerHTML.
if ( UpdateAutoFlag ) { UpdateSetTimeout = window.setTimeout(Update__Auto,UpdateAutoTimer); } // Set window to recall Update__Auto(timer) in timer milliseconds.
} // END Update__Auto.
// Update__AutoStatus(setStatus)
// Turn the UpdateAutoFlag on or off.
// setStatus = off, turn off the timer.
// on, turn on the timer.
function Update__AutoStatus(setStatus) {
if ( typeof setStatus !== 'undefined' ) {
if ( setStatus === 'off' ) {
UpdateAutoFlag = false;
} else if ( setStatus === 'on' ) {
UpdateAutoFlag = true;
}
}
return UpdateAutoFlag;
} // END Update__AutoStatus.
// Update__GetHTTPObject()
// Returns a new XMLHttpRequest().
function Update__GetHTTPObject() {
if ( typeof XMLHttpRequest !== 'undefined' ) {
return new XMLHttpRequest();
}
try {
return new ActiveXObject("Msxml2.XMLHTTP"); // Internet Explorer 5.x
} catch (e) {
try {
return new ActiveXObject("Microsoft.XMLHTTP"); // Internet Explorer 6.x
} catch (e) {
// Nothing to do.
}
}
return false;
} // END Update__GetHTTPObject;
Update__AutoStatus('off');