Why does the string not moving within the certain interval?

Question

Why does the string not moving within the certain interval?

49 views Asked by Ani At 24 November 2024 at 21:48

I am trying to make a simple code of a line moving 1px every 20 milliseconds (smt like a ticker) . Also, want it to disappear once it reaches the edge of the browser window using .offsetWidth property. Unfortunately, I'm stuck and I don't know why it's not moving at all. Please, help me find the mistake, or maybe I'm going in the wrong direction? Thanks!

<html>
<head>
    <title>Blablabla</title>
    <meta charset ="utf-8">
    <!-- <script type="text/javascript" src="line.js"></script> -->
</head>
<body onload="interval()">
    <div id="line">
    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod
    </div>
<script type="text/javascript">
    function interval() {
        var line = setInterval(function(){document.getElementById("line").style.left = scroll.offsetWidth}, 20);
    }
</script>
</body>
</html>

Original Q&A

There are 3 answers

Rayon On 16 February 2016 at 10:24

line must be absolute positioned element so that left css property will affect
I assume you have not mentioned +px(unit) while assigning left property in interval as element.offsetWidth does not return unit with the value[Ref]

RunningFromShia On 16 February 2016 at 10:34

Here is my shot:

<html>
<head>
    <title>Blablabla</title>
    <meta charset ="utf-8">
    <!-- <script type="text/javascript" src="line.js"></script> -->
</head>
<body>
    <div id="line">
    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod
    </div>
<script type="text/javascript">
number = 5; //should be increased each time
setInterval(function(){var d = document.getElementById('line');
d.style.position = "absolute";
number++; //increase number
d.style.left = number; //move the div according to the number
}, 200); //notice that you can increase/decrease 200 according to your will

</script>
</body>
</html>

**Medet Tleukabiluly** · Accepted Answer · 2016-02-16 10:28:58

Take a look at sample below, it has comments that should help you to understand, checkout demo and play around with code

//set starting offset
var leftOffset = 0;

//assign element to variable
var element = document.getElementById("line");

//css.left requires position.absolute
element.style.position = 'absolute';

//calculate width of element, in display.block it's 100%
element.style.display = 'inline-block';

//assign interval id to a variable for cancelation
var interval = setInterval(function(){
  
  //increase offset by 1
  leftOffset = leftOffset + 1;

  //check if element is sticked  to screen.right
  if(leftOffset + element.offsetWidth < document.body.offsetWidth) {
    //not sticked
    
    //add pixels
    element.style.left = leftOffset + 'px';
  } else {
    //sticked

    //remove interval
    clearInterval(interval);
    
    //hide element
    element.style.display = 'none';
  }
}, 20);

<div id="line">
  Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod
</div>

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Why does the string not moving within the certain interval?

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