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.
<!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.
<!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:
