"Adding a delay to each item when using knockout.js to push items into an observable array

I am currently working on an array that populates items into an interface. The issue I am facing is that all the items are appearing at once with a slight opacity animation. What I actually want is for each item to appear individually, with a small delay between them so it looks like they are coming in one after another.

Despite my efforts, it seems that no matter what I do, they still show up simultaneously. I have tried using rate limit, but it doesn't seem to make a difference. Below is the snippet of code where I am using splice, and I even attempted to use a setTimeout within the forEach loop.

 self.plays = ko.observableArray([]);

        self.update = function (period) {
             period.Plays.forEach(function (p, index) {
                        self.plays.splice(0, 0, p);
                    });
        };

CSS

.play-by-plays .play.flash,
    .line-scores .line-period.flash {
        transition: color 1s ease;
    }

    .play-by-plays .play,
    .line-scores .line-period {
        transition: color 1s ease;
    }

Answer №1

You mentioned trying out the setTimeout function. Have you attempted it in this way?

function Model(){
  var self = this;
  self.plays = ko.observableArray();

  self.Items = [{'item':'1'},{'item':'2'},{'item':'3'}];

  self.update = function(){
    var count = 0;
    self.Items.forEach(function(item){
      setTimeout(function(){
        self.plays.unshift(item);
      }, count);
      count += 500;
    });
  };

  self.update();
}

ko.applyBindings(new Model());
<script src= "https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.2/knockout-min.js"></script>
<div data-bind="foreach: plays">
  <span data-bind="text: item"></span>
</div>

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