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D3.js timer.restart() Function
  • Last Updated : 29 Jul, 2020

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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