We Keep Coding

Is it possible to create a new function then assign it to a trigger when you click a button or use an existing function?

At the moment, I manually create code then manually ask the user to set the trigger for the said function in order for the said user to receive a task and update task.
Heres an example of my coding:
User's Function
function Person1Variables () {
taskedPerson = assignedPerson.filter(x => x == "Person1 (assigned by Somebody)").length
taskReceiver = "Person1 (assigned by Somebody)"
taskReceived = "Person1 (Sent)"
functionCaller = "Person1 "
myTask = "My Tasks"
}
function taskSendPerson1() {
Person1Variables()
if (taskedPerson + 1 > 1){taskSending(taskTitle(myTask)); console.log("Snag")}
}
function updateTaskPerson1() {
Person1Variables()
taskComplete(taskTitle(myTask));
}
Task Creation and Update
function taskTitle(titleTasksList) {
if (typeof titleTasksList === 'undefined') { titleTasksList = 'default'; }
var rezultId = 0;
var response = Tasks.Tasklists.list();
var taskLists = response.items;
if (taskLists && taskLists.length > 0) {
for (var i = 0; i < taskLists.length; i++) {
var taskList = taskLists[i];
if (titleTasksList == 'default') {
rezultId = taskList.id; //return first item
break;
} else {
Logger.log('%s (%s)', taskList.title, taskList.id);
if (titleTasksList == taskList.title) {
rezultId = taskList.id;
break;
}
}
}
} else {
Logger.log('No task lists found.');
}
return rezultId;
}
function taskSending(taskListId) {
// Task details with title and notes for inserting new task
var currentResult = 1
var nextResult = 1
for (var resultsFound = 0; resultsFound < taskedPerson; resultsFound++){
console.log("pong")
var searchEngine = "Assigned Person"
var searchRange = sheet.getRange(nextResult,(lastColumn[0].indexOf(searchEngine) + 1),
sheet.getLastRow(), 1)
var searchRangeValues= searchRange.getValues()
currentResult = searchRangeValues.map(String).indexOf(taskReceiver) + nextResult
var resultTitle = responseNumber[currentResult -1]
var resultNote = typeSupport[currentResult - 1] + " = " + typeRequest[currentResult - 1]
let task = {
title: String(resultTitle),
notes: resultNote,
};
// Call insert method with taskDetails and taskListId to insert Task to specified tasklist.
console.log(task)
console.log(taskListId)
task = Tasks.Tasks.insert(task, taskListId);
// Print the Task ID of created task.
Logger.log('Task with ID "%s" was created.', task.id);
sheet.getRange(currentResult,2).setValue (taskReceived)
nextResult = currentResult + 1
console.log(nextResult + " " + "processed")
}
}
function newTask(taskListId) {
// Task details with title and notes for inserting new task
var allResults = [];
var allTitles = [];
for (var j = 0; j < itemResponses.length + 1; j++) {
var itemResponse = itemResponses[j];
for (var g = 0; g < 30; g++){ try {allResults [g] = String(itemResponses[g].getResponse()); allTitles [g] = itemResponses[g].getItem().getTitle();var lastResponse = g} catch(err) {}}
}
console.log("PING")
var refNumber = new Date().getFullYear().toString().substr(-2) + String(("00000000" + (formResponses.length))).substr(String(("00000000" + (formResponses.length))).length - 8);
let task = {
title: refNumber,
notes: allTitles [3] + " = " + allResults [3],
};
try {
// Call insert method with taskDetails and taskListId to insert Task to specified tasklist.
task = Tasks.Tasks.insert(task, taskListId);
// Print the Task ID of created task.
Logger.log('Task with ID "%s" was created.', task.id);
} catch (err) {
// TODO (developer) - Handle exception from Tasks.insert() of Task API
Logger.log('Failed with an error %s', err.message);
}
}
function taskComplete(taskListId) {
var optionalArgs = {
maxResults: 100,
showHidden: true
};
var tasks = Tasks.Tasks.list(taskListId, optionalArgs);
if (tasks.items) {
for (var i = 0; i < tasks.items.length; i++) {
var task = tasks.items[i];
for (var x = 0; x < responseNumber.length; x++){
if (responseNumber[x] == task.title){sheet.getRange(x + 1,lastColumn[0].indexOf("Status")+1).setValue(task.status); }
}
}
var dataFound = 0
//Tasks.Tasks.remove(taskListId,tasks.items[dataFound].id)
for (var x = 0; x < responseNumber.length; x++)
{try{if (tasks.items[dataFound].status == "completed" && (responseNumber.map(String).indexOf(String(tasks.items[dataFound].title))) > 1){Tasks.Tasks.remove(taskListId,tasks.items[dataFound].id); sheet.getRange(responseNumber.map(String).indexOf(String(tasks.items[dataFound].title)) + 1,lastColumn[0].indexOf("Assigned Person")+1).setValue(functionCaller)}; dataFound++} catch(err){}}
}
}
My plan was to create a button that can detect if that user has or has not created a function. If the user does not have dedicated function, then this button will create a function and assigned the trigger.

You don't need another function. The typical way to handle per user data is to store it in propertiesService and link it to triggerUid of the installed trigger.
Related:
Best way to create and manage someone's triggers (GAS)
Can the function called by ScriptApp.newTrigger identify the triggerID?
Is it possible to create a function on the fly and create triggers though? Maybe as a two step process through google-apps-script-api, but it's unnecessarily complicated for your case.

JavaScript Array & Global Variable Reference

I am trying to reference a global variable's value using my array output but I am unsure how to do that. I want to make these references outside the function as I will need to create many functions that use these variables.
Ignore the PFGetValue part, I need to use that for the program I am coding in. There will be many more dd_meg_x but this is just to show you what I'm doing. Currently, this will return the correct the text "dd_meg_x" - but I want to then reference the variable defined above. So for example, if the result in the array is dd_meg_1, I want the output to be "M Energy 16"
var dd_meg_1 = "M Energy 16";
var dd_meg_2 = "Ulra Energy";
var dd_meg_3 = "Another Option Here";
function canOrderMeg1() {
var brand = "meg";
var arrayLength = 21;
var canArray = [];
var variableName;
for (i = 0; i <= arrayLength; i++) {
variableName = ("dd_" + brand + "_" + i);
if (PFGetValue(variableName) === "Y") {
canArray.push(variableName);
}
canArray.join(", ");
}
return canArray[0];
}
function canOrderMeg2() {
var brand = "meg";
var arrayLength = 21;
var canArray = [];
var variableName;
for (i = 0; i <= arrayLength; i++) {
variableName = ("dd_" + brand + "_" + i);
if (PFGetValue(variableName) === "Y") {
canArray.push(variableName);
}
canArray.join(", ");
}
return canArray[1];
}

Try
return eval('string output code');
So this would look like
return eval(array output);

Try this:
var dd_meg_1 = "M Energy 16";
var dd_meg_2 = "Ulra Energy";
var dd_meg_3 = "Another Option Here";
function canOrderMeg1() {
return ["dd_meg_1", "dd_meg_2", "dd_meg_3"];
}
for(let i = 0; i < canOrderMeg1().length; i++){
if(typeof canOrderMeg1()[i] !== "undefined") {
console.log(window[canOrderMeg1()[i]]);
}
}

Closure inside loop - not sure how to address

for (var i = 0; i < stops.length; i++) {
var code = stops[i].atcocode;
var name = stops[i].common;
var direction = stops[i].direction;
var alertMessage = "View departures for " + stops[i].common + (directionText !== 'Unknown' ? (" (facing " + directionText + ")") : "") + "?";
this.map.addMarker({
icon: icon,
position: new plugin.google.maps.LatLng(stops[i].latitude, stops[i].longitude)
}, function(markerCallback) {
markerCallback.code = code;
markerCallback.name = name;
markerCallback.direction = direction;
markerCallback.alert = alertMessage;
markerCallback.addEventListener(plugin.google.maps.event.MARKER_CLICK, function(clickedMarker) {
alert(markerCallback.name);
});
_this.busStopMarkers.push(markerCallback);
});
}
JavaScript closure inside loops – simple practical example
I have viewed the question above and am not sure how to apply the same answer logic into my scenario. Could somebody please show me an example as to how I can make the alert show the indexed item in the array rather than the last one?

Create a callback factory:
function createCallback(_this, code, name, direction, alertMessage) {
return function(markerCallback) {
markerCallback.code = code;
markerCallback.name = name;
markerCallback.direction = direction;
markerCallback.alert = alertMessage;
markerCallback.addEventListener(plugin.google.maps.event.MARKER_CLICK, function(clickedMarker) {
alert(markerCallback.name);
});
_this.busStopMarkers.push(markerCallback);
};
}
Then use it to create a function inside your loop:
for (var i = 0; i < stops.length; i++) {
var code = stops[i].atcocode;
var name = stops[i].common;
var direction = stops[i].direction;
var alertMessage = "View departures for " + stops[i].common + (directionText !== 'Unknown' ? (" (facing " + directionText + ")") : "") + "?";
var callback = createCallback(_this, code, name, direction, alertMessage);
this.map.addMarker({
icon: icon,
position: new plugin.google.maps.LatLng(stops[i].latitude, stops[i].longitude)
}, callback);
}

You can create an anonymous function like this:
for (var i = 0; i < stops.length; i++) {
(function(me, stop){ // Use the stop as an argument, this function is directly called
var code = stop.atcocode;
var name = stop.common;
var direction = stop.direction;
var alertMessage = "View departures for " + stop.common + (directionText !== 'Unknown' ? (" (facing " + directionText + ")") : "") + "?";
me.map.addMarker({
icon: icon,
position: new plugin.google.maps.LatLng(stop.latitude, stop.longitude)
}, function(markerCallback) {
markerCallback.code = code;
markerCallback.name = name;
markerCallback.direction = direction;
markerCallback.alert = alertMessage;
markerCallback.addEventListener(plugin.google.maps.event.MARKER_CLICK, function(clickedMarker) {
alert(markerCallback.name);
});
_this.busStopMarkers.push(markerCallback);
});
})(this, stops[i]); // Pass the stop
}

Pushing array with function

var books = new Array();
books[0] = "Silmarillion: ";
books[1] = "Horus Rising: ";
books[2] = "Lord of the Rings: ";
var ratings = new Array();
ratings[0] = "9 ";
ratings[1] = "8 ";
ratings[2] = "7 ";
function printBooks()
{
for(var i = 0; i < books.length; i++)
{
document.writeln(books[i] +" " + ratings[i]);
}
}
printBooks();
I have this code and it (basically) achieves what I want it to do but it's quite bad. I'd like to have it in two functions, one function (addBooks(title, rating)) to add my books and one function (printBooks()) to print them. I'd like the user to be asked to add one book, ask the rating of it and do this three times.
After this I would like it to be printed.
I've tried to do it but I don't know how to write a function that adds into the arrays. I've only figured out I should use push() but not any more.. I hope it's clear enough.
EDIT
On top of this I would also like to have a way to calculate the average score of the books added. The code I got now for this is:
function averageRating ()
{
var sum = 0;
for(var u = 0; u < ratings.length; u++)
{
sum += parseInt(ratings[u]);
}
var avg = sum/ratings.length;
document.writeln("<br>Number of books read: " + ratings.length + "<br>The average rating of the books are: " + avg);
averageRating();

The concept is you have a library with some books.
So an OOP approach may be create a class Library with some method. Like:
function Library() {
var books = [];
this.addBook = function(bookName,rate) {
books.push({name:bookName, rating:rate});
}
this.printBooks = function() {
for(var i = 0; i < books.length; i++) {
document.writeln(books[i].name +": " + books[i].rating);
}
}
}
code:
var myLibrary = new Library();
myLibrary.addBook('Silmarillion',9);
myLibrary.addBook('Horus Rising',8);
myLibrary.addBook('Lord of the Rings',7);
myLibrary.printBooks();
However, it can be improved. You can create a class Book:
function Book(name,options) {
this.name = name;
this.rating = options.rating;
}
and class Library becomes:
function Library() {
var books = [];
this.addBook = function(book) {
books.push(book);
}
this.printBooks = function() {
for(var i = 0; i < books.length; i++) {
document.writeln(books[i].name +": " + books[i].rating);
}
}
// EDIT: ADDED for new features required
this.countBook = function() {
return books.length;
}
this.calculateRatingAverage = function() {
var sum = 0;
for(var i = 0; i < books.length; i++) {
sum += books[i].rating;
}
return sum/books.length;
}
}
and its use becomes:
var myLibrary = new Library();
myLibrary.addBook(new Book('Silmarillion',{rating:9}));
myLibrary.addBook(new Book('Horus Rising',{rating:8}));
myLibrary.addBook(new Book('Lord of the Rings',{rating:7}));
myLibrary.printBooks();
document.writeln("<br>Number of books read: " + myLibrary.countBook() + "<br>The average rating of the books are: " + myLibrary.calculateRatingAverage());
So you have a solid structure that you can optimize and work on it.

getElementById Another Question

As an extension question that Felix Kling answered so brilliantly I now need to do a two part check on the data table deployed.
Can anyone tell me how to add to the code below to allow me not only to copy the values of the pcode fields into an array but to check if there is a check in the checkbox with a corresponding row number i.e. route2 is check then add to the array but if route3 is not checked then exclude it.
function GetRoute()
{
var from = document.getElementById('inpAddr').value;
var locations = [from];
for(var i = 2; i <= 400; i++) {
var element = document.getElementById('pcode' + i);
if(element === null) { break; }
locations.push(element.innerHTML);
}
var options = new VERouteOptions();
options.DrawRoute = true;
options.RouteColor = new VEColor(63,160,222,1);
options.RouteWeight = 3;
options.RouteCallback = onGotRoute;
options.SetBestMapView = true;
options.DistanceUnit = VERouteDistanceUnit.Mile;
options.ShowDisambiguation = true;
map.GetDirections(locations,options);
}
Thanks in advance!
Justin

for( var i = 2 ; (element = document.getElementById('pcode' + i)) && i <= 400; i++ )
{
if( document.getElementById('route' + i).checked )
{
locations.push( element.innerHTML );
}
}

function GetRoute() {
var from = document.getElementById('inpAddr').value;
var locations = [from];
// My Modification Starts Here....
var maxLoopValue = 400;
var pcode, currentRoute, nextRoute;
for(var i = 2; i <= maxLoopValue; i++) {
pcode = document.getElementById('pcode' + i);
currentRoute = document.getElementById('route' + i);
// Make sure the currentRoute is 'checked'
if (currentRoute.checked) {
// Make sure there is a 'next' route before trying to check it
if (i < maxLoopValue) {
nextRoute = document.getElementById('route' + (i+1));
// Make sure the 'next' route is 'checked'
if (nextRoute.checked) {
locations.push(element.innerHTML);
}
} else {
// This is the last route, since we know it's checked, include it
locations.push(element.innerHTML);
}
}
}
// My Modification Ends Here....
var options = new VERouteOptions();
options.DrawRoute = true;
options.RouteColor = new VEColor(63,160,222,1);
options.RouteWeight = 3;
options.RouteCallback = onGotRoute;
options.SetBestMapView = true;
options.DistanceUnit = VERouteDistanceUnit.Mile;
options.ShowDisambiguation = true;
map.GetDirections(locations,options);
}