D3.js timer() function

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The D3.timer() function is used to run a timer function after a particular interval of time. The timer will run after a specified delay. The delay given is in milliseconds.

Syntax:

d3.timer(callback, delay);

Parameters: It takes the following two parameters.

callback: It is a function.
delay: It is the delay after which the function is executed.

Returns: It returns the Time of datatype Number.

Below given are a few examples of the above function.

Example 1:

<!DOCTYPE html> 
<html lang="en"> 
<head> 
  <meta charset="UTF-8"> 
  <meta name="viewport"
        content="width=device-width, 
                 initial-scale=1.0"> 
  <title>Document</title> 
</head> 
<style> 
</style> 
<body> 
  <!-- Fetching from CDN of D3.js -->
  <script type = "text/javascript"
          src = "https://d3js.org/d3.v4.min.js"> 
  </script> 
  <script> 
  let func=function(elapsed) { 
      console.log(elapsed); 
      if (elapsed > 500){ 
        console.log("Timer stopped") 
        timer.stop(); 
      } 
    } 
   var timer = d3.timer(func); 
  </script> 
</body> 
</html>

Output:

Example 2:

<!DOCTYPE html> 
<html lang="en"> 
<head> 
  <meta charset="UTF-8"> 
  <meta name="viewport"
        content="width=device-width, 
                 initial-scale=1.0"> 
  <title>Document</title> 
</head> 
<style> 
  .originalColor{ 
    height: 100px; 
    width: 100px; 
  } 
  .darkerColor{ 
    height: 100px; 
    width: 100px; 
  } 
</style> 
<body> 
  <!-- Fetching from CDN of D3.js -->
  <script type = "text/javascript" 
          src = "https://d3js.org/d3.v4.min.js"> 
  </script> 
  <script> 
  let func=function(e) { 
      console.log(e); 
      if (e>300){ 
        console.log("Timer stopped") 
        timer.stop(); 
      } 
    } 
    // Delay of 2000ms 
   var timer = d3.timer(func, 2000); 
  </script> 
</body> 
</html>