Web Front-end
JS Tutorial
How can I change the interval of the setinterval() method at runtime using JavaScript?
How can I change the interval of the setinterval() method at runtime using JavaScript?
The setInterval() method is used to call a specific block of code again and again after a specific time interval specified as a parameter in parentheses. The setInterval() method accepts two parameters. The first parameter is the code that needs to be executed repeatedly, and the second parameter is the time when the code needs to be executed again.
In this article, we will learn ways to change the time interval of the setInterval() method at runtime. This way, it will execute the given code at irregular or variable intervals.
JavaScript provides us with two different built-in methods to change the time interval of the setInterval() method, as shown below -
Use clearInterval() method.
Use the setTimeout() method.
Let us learn more about the working principle and implementation of these two methods respectively.
Use clearInterval() method
The clearInterval() method is used to clear or stop the previously executed setInterval() function. We can use this method to change the time interval of seInterval() method by calling this function inside the function passed to setInterval() and it will clear the previously called setInterval() method and use the new one which we will define in the code time value.
grammar
The following syntax will show you how to use the clearInterval() method to clear the previous setInterval() method -
clearInterval( code to be executed, time interval );
Let's actually understand this method and change the timing of the setInterval() method using the clearInterval() method in JavaScript.
algorithm
Step 1 - In the first step, we will add two different buttons in the HTML document, one for starting the interval and another for stopping the interval. < /p>
Step 2 - In this step, we will get all the required elements from the HTML document using IDs in JavaScript to perform changes in it.
Step 3 - In the next step, we will define a JavaScript function that first clears the previous setInterval() using the clearInterval() method, then with some new value, and uses our The function defined in this step calls the setInterval() method again.
Step 4 - In the last step, we will define another JavaScript function to stop the execution of setInterval() using the clearInterval() method.
Example
The examples below will help you actually understand the above algorithm by delving into the code -
<html>
<body>
<h2>Change the Time Interval of setinterval() Method at RunTime using JavaScript</h2>
<p id = "upper">The below text will print after a certain irregular interval of time every time.</p>
<button id = "btn" onclick = "start()"> Start Printing </button>
<button id = "stopbtn" onclick = "stop()"> Stop Printing </button>
<p id = "print1"> </p>
<p id = "result"> </p>
<p id = "print2"> </p>
<script>
var result = document.getElementById("result");
var upper = document.getElementById("upper");
var printVal1 = document.getElementById("print1");
var printVal2 = document.getElementById("print2");
var interval, t = 500;
function start() {
printVal1.innerHTML = " Printing Starts: ";
clearInterval(interval);
result.innerHTML += " Printed after: <b> " + t + " </b> time. <br> ";
t = t * 2;
interval = setInterval(start, t);
}
function stop() {
printVal2.innerHTML = " Printing Ends. ";
clearInterval(interval);
}
</script>
</body>
</html>
In the above example, we use the clearInterval() method to change the time interval of the setInterval() method using JavaScript at runtime.
Use setTimeout() method
The setTimeout() method is similar to the setInterval() method. It also calls a piece of code after a specific interval, but unlike setInterval(), it only executes the code once instead of over and over again. The setTimeout() method will automatically stop after executing the code once, so we do not need to call the clearInterval() method like the setInterval() method to stop executing the previous interval.
grammar
Use the setTimeout() method to change the time interval according to the following syntax -
setTimeout( code to be executed, time interval );
Now let’s see the actual implementation of this method with the help of a JavaScript code example.
algorithm
The algorithm of this method is almost the same as the previous method. You just need to perform some small changes as shown below -
Delete the clearInterval() method from the start() function of the previous algorithm.
Use the setTimeout() method to set the value of the interval variable instead of the setInterval() method with the same parameters.
Example
The following example will explain the actual use of the setTimeout method and help you understand the above changes in the previous algorithm that you need to perform -
<html>
<body>
<h2>Change the Time Interval of setinterval() Method at RunTime using JavaScript</h2>
<p id = "upper">The below text will print after a certain irregular interval of time every time.</p>
<button id = "btn" onclick = "start()">Start Printing</button>
<button id = "stopbtn" onclick = "stop()">Stop Printing</button>
<p id = "print1"> </p>
<p id = "result"> </p>
<p id = "print2"> </p>
<script>
var result = document.getElementById("result");
var upper = document.getElementById("upper");
var printVal1 = document.getElementById("print1");
var printVal2 = document.getElementById("print2");
var interval, t = 500;
function start() {
printVal1.innerHTML = " Printing Starts: ";
result.innerHTML += " Printed after: <b> " + t + " </b> time. <br> ";
t = t * 2;
interval = setTimeout(start, t);
}
function stop() {
printVal2.innerHTML = " Printing Ends. ";
clearInterval(interval);
}
</script>
</body>
</html>
In this example, we use JavaScript's setTimeout() method to use JavaScript to change the time interval between each call at runtime.
In this article, we learned about two different ways to change the time interval using the setInterval() method. We discuss both approaches in detail with the required theory and practical implementation with the help of separate code examples for each approach.
The above is the detailed content of How can I change the interval of the setinterval() method at runtime using JavaScript?. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
What should I do if I encounter garbled code printing for front-end thermal paper receipts?
Apr 04, 2025 pm 02:42 PM
Frequently Asked Questions and Solutions for Front-end Thermal Paper Ticket Printing In Front-end Development, Ticket Printing is a common requirement. However, many developers are implementing...
Demystifying JavaScript: What It Does and Why It Matters
Apr 09, 2025 am 12:07 AM
JavaScript is the cornerstone of modern web development, and its main functions include event-driven programming, dynamic content generation and asynchronous programming. 1) Event-driven programming allows web pages to change dynamically according to user operations. 2) Dynamic content generation allows page content to be adjusted according to conditions. 3) Asynchronous programming ensures that the user interface is not blocked. JavaScript is widely used in web interaction, single-page application and server-side development, greatly improving the flexibility of user experience and cross-platform development.
Who gets paid more Python or JavaScript?
Apr 04, 2025 am 12:09 AM
There is no absolute salary for Python and JavaScript developers, depending on skills and industry needs. 1. Python may be paid more in data science and machine learning. 2. JavaScript has great demand in front-end and full-stack development, and its salary is also considerable. 3. Influencing factors include experience, geographical location, company size and specific skills.
Is JavaScript hard to learn?
Apr 03, 2025 am 12:20 AM
Learning JavaScript is not difficult, but it is challenging. 1) Understand basic concepts such as variables, data types, functions, etc. 2) Master asynchronous programming and implement it through event loops. 3) Use DOM operations and Promise to handle asynchronous requests. 4) Avoid common mistakes and use debugging techniques. 5) Optimize performance and follow best practices.
How to achieve parallax scrolling and element animation effects, like Shiseido's official website?
or:
How can we achieve the animation effect accompanied by page scrolling like Shiseido's official website?
Apr 04, 2025 pm 05:36 PM
Discussion on the realization of parallax scrolling and element animation effects in this article will explore how to achieve similar to Shiseido official website (https://www.shiseido.co.jp/sb/wonderland/)...
The Evolution of JavaScript: Current Trends and Future Prospects
Apr 10, 2025 am 09:33 AM
The latest trends in JavaScript include the rise of TypeScript, the popularity of modern frameworks and libraries, and the application of WebAssembly. Future prospects cover more powerful type systems, the development of server-side JavaScript, the expansion of artificial intelligence and machine learning, and the potential of IoT and edge computing.
How to merge array elements with the same ID into one object using JavaScript?
Apr 04, 2025 pm 05:09 PM
How to merge array elements with the same ID into one object in JavaScript? When processing data, we often encounter the need to have the same ID...
The difference in console.log output result: Why are the two calls different?
Apr 04, 2025 pm 05:12 PM
In-depth discussion of the root causes of the difference in console.log output. This article will analyze the differences in the output results of console.log function in a piece of code and explain the reasons behind it. �...
