D3.js timer.restart() Function

0 0 1 minute read

The timer.restart() function in D3.js is used to restart a timer with the given function and delay. The timer.restart() function is used when one wants to reset the timer and start again.

Syntax:

timer.restart(callback, delay);

Parameters: It takes two parameters as mentioned above and described below:

callback: It is the function to be stopped or start after a particular delay.
delay: It is the time after which the function will be executed or stop

Example 1: When no delay is given.

HTML

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <meta charset="UTF-8"> 
    <meta name="viewport" content= 
        "width=device-width, initial-scale=1.0"> 
</head> 
  
<body> 
    <!-- Fetching from CDN of D3.js -->
    <script type="text/javascript" 
        src="https://d3js.org/d3.v4.min.js"> 
    </script> 
      
    <script> 
        count = 0; 
        let func = function (e) { 
            console.log(e) 
            if (e > 40) { 
                console.log("Timer stopped after 40ms") 
                if (e > 40) { 
                    count++; 
  
                    // Restarting the timer again 
                    console.log("Timer restarts") 
                    timer.restart(func) 
                } 
                if (count > 2) { 
                    timer.stop(); 
                    console.log( 
                        "count > 2 so timer is stopped") 
                } 
            } 
        } 
        var timer = d3.timer(func); 
    </script> 
</body> 
  
</html>

Output:

Example 2: When a delay is given.

HTML

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <meta charset="UTF-8"> 
    <meta name="viewport" content= 
        "width=device-width, initial-scale=1.0"> 
</head> 
  
<body> 
    <!-- Fetching from CDN of D3.js -->
    <script type="text/javascript" 
        src="https://d3js.org/d3.v4.min.js"> 
    </script> 
      
    <script> 
        count = 0; 
        let func = function (e) { 
            console.log(e) 
            if (e > 10) { 
                console.log("Timer stopped after 10ms") 
                if (e > 10) { 
                    count++; 
  
                    // Restarting the timer again 
                    console.log("Timer restarts") 
                    timer.restart(func) 
                } 
                if (count > 4) { 
                    timer.stop(); 
                    console.log( 
                    "count > 4 so timer is stopped") 
                } 
            } 
        } 
        // A delay of 2000ms 
        var timer = d3.timer(func, 2000); 
    </script> 
</body> 
  
</html>

Output:

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