once completion of the function (including any setTimeouts), proceed to call the next function

Question

once completion of the function (including any setTimeouts), proceed to call the next function

Greetings! I am currently working on an ajax call that includes this function:

for(var i in data){
    setTimeout((function(i) {
         return function(){
            CreateMarker(data[i]);
         };
     })(i), i*500);
    }

This function adds markers to a Google map, utilizing google.maps.Animation.DROP. I would like to change the drop animation to

setAnimation(google.maps.Animation.BOUNCE)

once all the markers are on the map. I do know how to switch animations.

My predicament is as follows: While I can determine when the ajax call has concluded, the timeout causes difficulty in identifying when all markers have been "dropped" onto the map, leading to delay in changing the animation.

Does anyone have suggestions on how I can accurately detect when all markers have been placed on the map so that I can modify the animation? Thank you!

javascript ajax google-maps

Answer 1

Answer №1

To resolve the issue, consider adding an additional setTimeout statement after your for loop:

for(var i = 0; i<data.length; i++){ // assuming data is a contiguous array
  setTimeout((function(i) {
    return function(){
      CreateMarker(data[i]);
    };
  })(i), i*500);
}
setTimeout(changeAnimation, (i-1)*500);

The changeAnimation function will run immediately following the last CreateMarker execution.

If you notice recurring patterns, it might be beneficial to substitute setTimeout with setInterval:

var interval = setInterval(function(){
  var markerData = data.shift(); // modifies data, make a copy if needed elsewhere
  if (markerData) CreateMarker(markerData);
  else { clearInterval(interval); changeAnimation() }
}, 500);

In this basic implementation, changeAnimation triggers 500ms after the CreateMarker call but could easily be adjusted to trigger immediately after:

var interval = setInterval(function(){
  var markerData = data.shift();
  CreateMarker(markerData);
  if (!data.length){ clearInterval(interval); changeAnimation() }
}, 500);

Answer 2

To resolve the issue, consider adding an additional setTimeout statement after your for loop:

for(var i = 0; i<data.length; i++){ // assuming data is a contiguous array
  setTimeout((function(i) {
    return function(){
      CreateMarker(data[i]);
    };
  })(i), i*500);
}
setTimeout(changeAnimation, (i-1)*500);

The changeAnimation function will run immediately following the last CreateMarker execution.

If you notice recurring patterns, it might be beneficial to substitute setTimeout with setInterval:

var interval = setInterval(function(){
  var markerData = data.shift(); // modifies data, make a copy if needed elsewhere
  if (markerData) CreateMarker(markerData);
  else { clearInterval(interval); changeAnimation() }
}, 500);

In this basic implementation, changeAnimation triggers 500ms after the CreateMarker call but could easily be adjusted to trigger immediately after:

var interval = setInterval(function(){
  var markerData = data.shift();
  CreateMarker(markerData);
  if (!data.length){ clearInterval(interval); changeAnimation() }
}, 500);

Answer 3

Answer №2

To keep track of the markers that have been placed, you can use a variable to count them and then check if all markers have been placed after each one is added.

var finishedMarkers = 0;

for(var index in markerData){
    setTimeout((function(index) {
        return function() {
            addMarkerToMap(markerData[index]);
            if (++finishedMarkers == markerData.length) {
                // Your code execution goes here
            }
        };
    })(index), index*500);
}

If you want to see this code in action with random data, check out this example: http://jsfiddle.net/XJ9ZQ/

Answer 4

To keep track of the markers that have been placed, you can use a variable to count them and then check if all markers have been placed after each one is added.

var finishedMarkers = 0;

for(var index in markerData){
    setTimeout((function(index) {
        return function() {
            addMarkerToMap(markerData[index]);
            if (++finishedMarkers == markerData.length) {
                // Your code execution goes here
            }
        };
    })(index), index*500);
}

If you want to see this code in action with random data, check out this example: http://jsfiddle.net/XJ9ZQ/

Answer 5

Answer №3

To effectively manage timers and track the firing sequence, it is important to keep a count of the timers being used.

The versatility of this solution lies in its compatibility with both arrays and objects as the data variable type is not explicitly defined. However, it's worth noting that iterating through arrays with for (var i in data) is generally discouraged, so the assumption was made that data represents an object.

var timerCounter = 0;
for(var i in data){
    ++timerCounter;
    setTimeout((function(i) {
         return function(){
            CreateMarker(data[i]);
            if (--timerCounter === 0) {
                // signals the completion of the last timer
            }
         };
     })(i), i*500);
}

Answer 6

To effectively manage timers and track the firing sequence, it is important to keep a count of the timers being used.

The versatility of this solution lies in its compatibility with both arrays and objects as the data variable type is not explicitly defined. However, it's worth noting that iterating through arrays with for (var i in data) is generally discouraged, so the assumption was made that data represents an object.

var timerCounter = 0;
for(var i in data){
    ++timerCounter;
    setTimeout((function(i) {
         return function(){
            CreateMarker(data[i]);
            if (--timerCounter === 0) {
                // signals the completion of the last timer
            }
         };
     })(i), i*500);
}

once completion of the function (including any setTimeouts), proceed to call the next function

Answer №1

Answer №2

Answer №3

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