Tips on dynamically changing the position of a div: Utilize absolute positioning within a for loop

Is there a way to extract the position x value of my div and store it in a variable? How do we then iterate over it within a for loop?

<div id="object"></div>
<style>
  #object{
    position:absolute;
    width:10px;
    height:10px;
    background:#ff8800;
  }
</style>
<script>
  function play(){
    // Can someone help me figure out how to capture the div's position as a variable and use it in a for loop?
    // I'm stuck on how to modify its position within the loop
    for(){

    }
    // Any ideas on what to do next would be greatly appreciated
 }
 </script>
javascripthtmlcss

Answer №1

Experimenting with a Play and Stop Logic using UI Elements

 var speed = 5;
        function play(){
            if($("#object").data("play"))
            {
               setTimeout(function(){
   var count = $("#object").position().left;
count += speed;
$("#object").css("left",count);
                requestAnimationFrame(play);
  },500);
            }
        }
        $("#play").click(function(){
            $("#object").data("play",true);
          $('#object').css('background','green');
play();
$('#stop').css('display','block');
        });
        $("#stop").click(function(){
            $("#object").data("play",false);
            $('#object').css('background','#ff8800');
$('#stop').css('display','none');
        });
 input
    {
    position:absolute;
    width:50px;
    height:25px;
    top:100px;
    }
    #play
    {
    background:green;
border:none;
color:#fff;
border-radius:15px;
    left:35px;
    }
    #stop
    {
background:#ff8800;
border:none;
border-radius:15px;
color:#fff;
    left:35px;
display:none;
    }
    #object{
    position:absolute;
    width:10px;
    height:10px;
    background:#ff8800;
    }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
 <div id="object"></div>
    <input id="play" type="button" value="play">
    <input id="stop" type="button" value="stop">

Answer №2

In order to achieve the desired result, using a traditional for loop to set new positions of a div is not feasible due to JavaScript's single-threaded nature. For more insight, I recommend checking out this question on Stack Overflow.

To work around this limitation, you can utilize setTimeout calls to update positions in their respective callbacks. You can see this method in action through this fiddle, showcasing how small delays can simulate parallel processing.

The concept behind this approach is to allow periodic UI updates by inserting delays in between iterations. While JavaScript lacks synchronous sleep functions, leveraging setTimeout (or more complex setInterval logic) can mimic simultaneous actions. Even brief pauses ensure that the UI reflects the latest changes periodically.

For fluent animations on web pages, CSS transitions are highly recommended over JS-based solutions. If you're open to alternatives, check out this fiddle demonstrating CSS transitions for seamless animation effects.

Additional resources:

Answer №3

give this a shot...

 <!DOCTYPE HTML>
<html>
<head>
    <title>test area</title>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
</head>
<body>

    <div id="object"></div>
    <input id="play" type="button" value="start">
    <input id="stop" type="button" value="halt">
    <style>
    input
    {
    position:absolute;
    width:50px;
    height:25px;
    top:100px;
    }
    #play
    {
    left:35px;
    }
    #stop
    {
    left:100px;
    }
    #object{
    position:absolute;
    width:10px;
    height:10px;
    background:#ff8800;
    }
    </style>
    <script>
        var _speed = 5;
        function play(){
            if($("#object").data("run"))
            {
                var _x = $("#object").position().left;
                _x += _speed;

                $("#object").css("left",_x);
                requestAnimationFrame(play);
            }
        }
        $("#play").click(function(){
            $("#object").data("run",true);
            play();
        });
        $("#stop").click(function(){
            $("#object").data("run",false);
        });
    </script>
</body>
</html>

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