Based on jQuery, the text box can only input numbers (decimals, integers)

Home

Web Front-end

JS Tutorial

Based on jQuery, the text box can only input numbers (decimals, integers)_jquery

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB

May 16, 2016 pm 03:20 PM

In actual applications, the text box sometimes only allows the input of integers, but sometimes it may be more "fraternal" and allows the input of floating point numbers. Let's introduce through example code how to implement using jquery. The text box can only enter decimals , the code is as follows:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="author" content="http://www.jb51.net/" />
<title>脚本之家</title>
<script type="text/javascript" src="mytest/jQuery/jquery-1.8.3.js"></script>
<script type="text/javascript">
$(function(){ 
$(".NumText").keyup(function(){ 
$(this).val($(this).val().replace(/[^0-9.]/g,'')); 
}).bind("paste",function(){ 
$(this).val($(this).val().replace(/[^0-9.]/g,'')); 
})
}); 
</script>
</head>
<body>
<input type="text" class="NumText"/>
</body>
</html>

The above code meets our requirements. Only integers or floating point numbers can be entered in the text box. The code is relatively simple and I won’t introduce it here.

The following will introduce how to use jquery to realize that the text box can only input integers:

Sometimes it may be necessary to stipulate that the text box content can only input integers. Here is a code example that can realize this function for the reference of friends in need.

The code is as follows:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="author" content="http://www.jb51.net" />
<title>脚本之家</title>
<script type="text/javascript" src="mytest/jQuery/jquery-1.8.3.js"></script>
<script type="text/javascript">
$(function(){ 
$(".NumText").keyup(function(){ 
$(this).val($(this).val().replace(/\D|^0/g,'')); 
}).bind("paste",function(){
$(this).val($(this).val().replace(/\D|^0/g,'')); 
})
}); 
</script>
</head>
<body>
<input type="text" class="NumText"/>
</body>
</html>

The above code achieves the expected requirements. Only integers can be entered in the text box. The following is an introduction to its implementation process.

Code comments:

1.$(function(){}), when the document structure is completely loaded, execute the code in the function.
2.$(".NumText").keyup(function(){}), register the keyup event processing function for the text box.
3.$(this).val($(this).val().replace(/D|^0/g,'')), use regular expressions through the replace() function to replace non-numeric content with empty .
4.bind("paste",function(){$(this).val($(this).val().replace(/D|^0/g,''));}), register paste event processing Vague, of course, chain calls are used here, which prevents users from copying and pasting using ctrl v.

The above code is relatively simple to write, and some difficult points are attached with comments. I believe it will be helpful to everyone.

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

Replace String Characters in JavaScriptMar 11, 2025 am 12:07 AM

Detailed explanation of JavaScript string replacement method and FAQ This article will explore two ways to replace string characters in JavaScript: internal JavaScript code and internal HTML for web pages. Replace string inside JavaScript code The most direct way is to use the replace() method: str = str.replace("find","replace"); This method replaces only the first match. To replace all matches, use a regular expression and add the global flag g: str = str.replace(/fi

8 Stunning jQuery Page Layout PluginsMar 06, 2025 am 12:48 AM

Leverage jQuery for Effortless Web Page Layouts: 8 Essential Plugins jQuery simplifies web page layout significantly. This article highlights eight powerful jQuery plugins that streamline the process, particularly useful for manual website creation

Build Your Own AJAX Web ApplicationsMar 09, 2025 am 12:11 AM

So here you are, ready to learn all about this thing called AJAX. But, what exactly is it? The term AJAX refers to a loose grouping of technologies that are used to create dynamic, interactive web content. The term AJAX, originally coined by Jesse J

How do I create and publish my own JavaScript libraries?Mar 18, 2025 pm 03:12 PM

Article discusses creating, publishing, and maintaining JavaScript libraries, focusing on planning, development, testing, documentation, and promotion strategies.

Load Box Content Dynamically using AJAXMar 06, 2025 am 01:07 AM

This tutorial demonstrates creating dynamic page boxes loaded via AJAX, enabling instant refresh without full page reloads. It leverages jQuery and JavaScript. Think of it as a custom Facebook-style content box loader. Key Concepts: AJAX and jQuery

10 jQuery Fun and Games PluginsMar 08, 2025 am 12:42 AM

10 fun jQuery game plugins to make your website more attractive and enhance user stickiness! While Flash is still the best software for developing casual web games, jQuery can also create surprising effects, and while not comparable to pure action Flash games, in some cases you can also have unexpected fun in your browser. jQuery tic toe game The "Hello world" of game programming now has a jQuery version. Source code jQuery Crazy Word Composition Game This is a fill-in-the-blank game, and it can produce some weird results due to not knowing the context of the word. Source code jQuery mine sweeping game

How to Write a Cookie-less Session Library for JavaScriptMar 06, 2025 am 01:18 AM

This JavaScript library leverages the window.name property to manage session data without relying on cookies. It offers a robust solution for storing and retrieving session variables across browsers. The library provides three core methods: Session

jQuery Parallax Tutorial - Animated Header BackgroundMar 08, 2025 am 12:39 AM

This tutorial demonstrates how to create a captivating parallax background effect using jQuery. We'll build a header banner with layered images that create a stunning visual depth. The updated plugin works with jQuery 1.6.4 and later. Download the

See all articles