Jquery ajax technology realizes transmitting values to a certain page every N seconds-JS Tutorial-php.cn

Home

Web Front-end

JS Tutorial

Jquery ajax technology realizes transmitting values to a certain page every N seconds

不言

Jul 02, 2018 pm 02:30 PM

This article introduces jquery ajax technology to transfer values to a page at regular intervals, as well as the syntax of the setinterval() method. Friends who are interested in this article can refer to it

Sometimes we It is necessary to pass values to a certain page every once in a while, such as a chat room. Every few seconds, the value is passed to the database processing page and retrieved, and then displayed in the chat window. Or it can check every once in a while whether there is an interval of 2 minutes between the last time the user spoke and now, and if so, log out the user. At this time we will use the HTML DOM setInterval() method.

The setInterval() method calls a function or evaluates an expression at a specified period (in milliseconds).

The setInterval() method will continue to call the function until clearInterval() is called or the window is closed. The ID value returned by setInterval() can be used as an argument to the clearInterval() method.

Syntax:

setInterval(code,millisec[,"lang"])

code

Required. A function to be called or a string of code to be executed.

millisec

Must. The time interval, in milliseconds, between periodic executions or calls to code.

eg:

 setInterval(function(){
      host = window.location.host
      $.post("http://"+host+"/index.php/Article/cpMes/value/1");
    },5000);

##Extension:

clearInterval() Method

clearInterval() method cancels the timeout set by setInterval().
The parameter of the clearInterval() method must be the ID value returned by setInterval().

eg:

<html>
<body>
<input type="text" id="clock" size="35" />
<script language=javascript>
var int=self.setInterval("clock()",50)
function clock()
 {
 var t=new Date()
 document.getElementById("clock").value=t
 }
</script>
</form>
<button onclick="int=window.clearInterval(int)">
Stop interval</button>
</body>
</html>

The above is the entire content of this article. I hope it will be helpful to everyone’s study. More For more related content, please pay attention to the PHP Chinese website!

Related recommendations:

jQuery implements the method of monitoring all ajax requests on the page

Implements global validation under bootstrapValidator based on jQuery

The above is the detailed content of Jquery ajax technology realizes transmitting values to a certain page every N seconds. For more information, please follow other related articles on the PHP Chinese website!

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Python vs. JavaScript: Performance and Efficiency ConsiderationsApr 30, 2025 am 12:08 AM

The differences in performance and efficiency between Python and JavaScript are mainly reflected in: 1) As an interpreted language, Python runs slowly but has high development efficiency and is suitable for rapid prototype development; 2) JavaScript is limited to single thread in the browser, but multi-threading and asynchronous I/O can be used to improve performance in Node.js, and both have advantages in actual projects.

The Origins of JavaScript: Exploring Its Implementation LanguageApr 29, 2025 am 12:51 AM

JavaScript originated in 1995 and was created by Brandon Ike, and realized the language into C. 1.C language provides high performance and system-level programming capabilities for JavaScript. 2. JavaScript's memory management and performance optimization rely on C language. 3. The cross-platform feature of C language helps JavaScript run efficiently on different operating systems.

Behind the Scenes: What Language Powers JavaScript?Apr 28, 2025 am 12:01 AM

JavaScript runs in browsers and Node.js environments and relies on the JavaScript engine to parse and execute code. 1) Generate abstract syntax tree (AST) in the parsing stage; 2) convert AST into bytecode or machine code in the compilation stage; 3) execute the compiled code in the execution stage.

The Future of Python and JavaScript: Trends and PredictionsApr 27, 2025 am 12:21 AM

The future trends of Python and JavaScript include: 1. Python will consolidate its position in the fields of scientific computing and AI, 2. JavaScript will promote the development of web technology, 3. Cross-platform development will become a hot topic, and 4. Performance optimization will be the focus. Both will continue to expand application scenarios in their respective fields and make more breakthroughs in performance.

Python vs. JavaScript: Development Environments and ToolsApr 26, 2025 am 12:09 AM

Both Python and JavaScript's choices in development environments are important. 1) Python's development environment includes PyCharm, JupyterNotebook and Anaconda, which are suitable for data science and rapid prototyping. 2) The development environment of JavaScript includes Node.js, VSCode and Webpack, which are suitable for front-end and back-end development. Choosing the right tools according to project needs can improve development efficiency and project success rate.

Is JavaScript Written in C? Examining the EvidenceApr 25, 2025 am 12:15 AM

Yes, the engine core of JavaScript is written in C. 1) The C language provides efficient performance and underlying control, which is suitable for the development of JavaScript engine. 2) Taking the V8 engine as an example, its core is written in C, combining the efficiency and object-oriented characteristics of C. 3) The working principle of the JavaScript engine includes parsing, compiling and execution, and the C language plays a key role in these processes.

JavaScript's Role: Making the Web Interactive and DynamicApr 24, 2025 am 12:12 AM

JavaScript is at the heart of modern websites because it enhances the interactivity and dynamicity of web pages. 1) It allows to change content without refreshing the page, 2) manipulate web pages through DOMAPI, 3) support complex interactive effects such as animation and drag-and-drop, 4) optimize performance and best practices to improve user experience.

C and JavaScript: The Connection ExplainedApr 23, 2025 am 12:07 AM

C and JavaScript achieve interoperability through WebAssembly. 1) C code is compiled into WebAssembly module and introduced into JavaScript environment to enhance computing power. 2) In game development, C handles physics engines and graphics rendering, and JavaScript is responsible for game logic and user interface.

See all articles