Detailed explanation of JS implementation of tab examples

Home

Web Front-end

JS Tutorial

Detailed explanation of JS implementation of tab examples_javascript skills

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB

May 16, 2016 pm 03:31 PM

jsTab

The example in this article describes how to implement tabs in JS. Share it with everyone for your reference, the details are as follows:

Idea: The tab is to click the button to switch to the corresponding content. In fact, it is to click the button to switch the content through display (block none).

1. First get the element.

2. The for loop traverses the button elements to add onclick or onmousemove events.

3. Because the current button will be displayed in a highlighted state when clicked, it is necessary to set all button styles to empty and set the display of all DIVs to none through a for loop.

4. Add a style to the current button, display the current DIV, and set the display to block.

Note: To add multiple events to multiple elements, you need to use a for loop to traverse them. If the tab is switched by clicking, the current button height, click and button highlighting are two events, so two for loops are used to traverse it.

HTML code:

<div id="box">
 <input type="button" value="1" />
 <input type="button" value="2" />
 <input type="button" value="3" />
 <input type="button" value="4" />
 <div>1</div>
 <div>2</div>
 <div>3</div>
 <div>4</div>
</div>

JS code:

<script>
 window.onload=function(){
  var box=document.getElementById('box');
  var input=box.getElementsByTagName('input');
  var div=box..getElementsByTagName('div');
  for(var i=0;i<input.length;i++){ //循环历遍onclick事件
   input[i].index=i; //input[0].index=0 index是自定义属性
   input[i].onclick=function(){
    for(var i=0;i<input.length;i++){ //循环历遍去掉button样式和把div隐藏
     input[i].className='';
     div[i].style.display='none';
    };
    this.className='active'; //当前按钮添加样式
    div[this.index].style.display='block'; //div显示 this.index是当前div 即div[0]之类的
   };
  };
  };
</script>

Additional: complete steps to write simple tab with js

As shown in the picture, the simplest pure tab

The first step is, of course, to write the html code and css style

<!DOCTYPE html>
<html>
<head>
<meta charset="gb2312" />
<title>无标题文档</title>
<style>
body,ul,li{margin:0; padding:0; font:12px/1.5 arial;}
ul,li{list-style:none;}
.wrap{width:500px; margin:20px auto;}
.hide{display:none;}
#tab_t{height:25px;border-bottom:1px solid #ccc;}
#tab_t li{float:left; width:80px; height:24px; line-height:24px; margin:0 4px; text-align:center; border:1px solid #ccc; border-bottom:none; background:#f5f5f5; cursor:pointer}
#tab_t .act{ position:relative; height:25px; margin-bottom:-1px; background:#fff;}
#tab_c{border:1px solid #ccc; border-top:none; padding:20px;}
</style>
</head>
<body>
<div class="wrap">
 <ul id="tab_t">
 <li class="act">选择1</li>
 <li>选择2</li>
 <li>选择3</li>
 <li>选择4</li>
 </ul>
 <div id="tab_c">
 <div>内容1</div>
 <div class="hide">内容2</div>
 <div class="hide">内容3</div>
 <div class="hide">内容4</div>
 </div>
</div> 
</body>
</html>

The second step is to achieve a simple switching effect

Point 1: abc.document.getElementsByTagName("li"): Gets all the elements with the tag li under abc. What is returned is a collection of elements with some attributes of the array.

Point 2: Loop, first loop to add the onclick event to li, and then when the onlink event is clicked, loop again to remove the act style of all tabs and hide all content. Then let the clicked option and corresponding content display.

Point 3: tab_t_li[i].index = i; When looping, add an extra attribute to the tab and assign a value to match the tab and content.

<!DOCTYPE html>
<html>
<head>
<meta charset="gb2312" />
<title>无标题文档</title>
<style>
body,ul,li{margin:0; padding:0; font:12px/1.5 arial;}
ul,li{list-style:none;}
.wrap{width:500px; margin:20px auto;}
.hide{display:none;}
#tab_t{height:25px;border-bottom:1px solid #ccc;}
#tab_t li{float:left; width:80px; height:24px; line-height:24px; margin:0 4px; text-align:center; border:1px solid #ccc; border-bottom:none; background:#f5f5f5; cursor:pointer}
#tab_t .act{ position:relative; height:25px; margin-bottom:-1px; background:#fff;}
#tab_c{border:1px solid #ccc; border-top:none; padding:20px;}
</style>
<script>
window.onload = function(){
 var tab_t = document.getElementById("tab_t");
 var tab_t_li = tab_t.getElementsByTagName("li");
 var tab_c = document.getElementById("tab_c");
 var tab_c_li = tab_c.getElementsByTagName("div");
 var len = tab_t_li.length;
 var i=0;
 for(i=0; i<len; i++){
  tab_t_li[i].index = i;
  tab_t_li[i].onclick = function(){
   for(i=0; i<len; i++){
    tab_t_li[i].className = '';
    tab_c_li[i].className = 'hide';
   }
   tab_t_li[this.index].className = 'act';
   tab_c_li[this.index].className = '';
  }
 }
}
</script>
</head>
<body>
<div class="wrap">
 <ul id="tab_t">
 <li class="act">选择1</li>
 <li>选择2</li>
 <li>选择3</li>
 <li>选择4</li>
 </ul>
 <div id="tab_c">
 <div>内容1</div>
 <div class="hide">内容2</div>
 <div class="hide">内容3</div>
 <div class="hide">内容4</div>
 </div>
</div> 
</body>
</html>

The third step is to write it as a function. The above writing method can only use one tab per page. If you add another one, you need to make a copy and change many variable names.

Key points: tab_t_li[i][evt] Because the value is passed as a string, if it is written directly, it will be tab_t_li[i]. "onclick" cannot be executed like this, but will tab_t_li["onclick"] be executed like this? question.

Okay, now you can have multiple switches on one page. You just need to write the corresponding id name, tag name, and event name when calling the function

<!DOCTYPE html>
<html>
<head>
<meta charset="gb2312" />
<title>无标题文档</title>
<style>
body,ul,li{margin:0; padding:0; font:12px/1.5 arial;}
ul,li{list-style:none;}
.wrap{width:500px; margin:20px auto;}
.hide{display:none;}
#tab_t{height:25px;border-bottom:1px solid #ccc;}
#tab_t li{float:left; width:80px; height:24px; line-height:24px; margin:0 4px; text-align:center; border:1px solid #ccc; border-bottom:none; background:#f5f5f5; cursor:pointer}
#tab_t .act{ position:relative; height:25px; margin-bottom:-1px; background:#fff;}
#tab_c{border:1px solid #ccc; border-top:none; padding:20px;}
</style>
<script>
window.onload = function(){
 tab("tab_t","li","tab_c","div","onmouseover")
 function tab(tab_t,tab_t_tag,tab_c,tag_c_tag,evt){
  var tab_t = document.getElementById(tab_t);
  var tab_t_li = tab_t.getElementsByTagName(tab_t_tag);
  var tab_c = document.getElementById(tab_c);
  var tab_c_li = tab_c.getElementsByTagName(tag_c_tag);
  var len = tab_t_li.length;
  var i=0;
  for(i=0; i<len; i++){
   tab_t_li[i].index = i;
   tab_t_li[i][evt] = function(){
    for(i=0; i<len; i++){
     tab_t_li[i].className = '';
     tab_c_li[i].className = 'hide';
    }
    tab_t_li[this.index].className = 'act';
    tab_c_li[this.index].className = '';
   }
  }
 }
}
</script>
</head>
<body>
<div class="wrap">
 <ul id="tab_t">
 <li class="act">选择1</li>
 <li>选择2</li>
 <li>选择3</li>
 <li>选择4</li>
 </ul>
 <div id="tab_c">
 <div>内容1</div>
 <div class="hide">内容2</div>
 <div class="hide">内容3</div>
 <div class="hide">内容4</div>
 </div>
</div> 
</body>
</html>

I hope this article will be helpful to everyone in JavaScript programming.

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

JavaScript and the Web: Core Functionality and Use CasesApr 18, 2025 am 12:19 AM

The main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.

Understanding the JavaScript Engine: Implementation DetailsApr 17, 2025 am 12:05 AM

Understanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.

Python vs. JavaScript: The Learning Curve and Ease of UseApr 16, 2025 am 12:12 AM

Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.

Python vs. JavaScript: Community, Libraries, and ResourcesApr 15, 2025 am 12:16 AM

Python and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.

From C/C to JavaScript: How It All WorksApr 14, 2025 am 12:05 AM

The shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.

JavaScript Engines: Comparing ImplementationsApr 13, 2025 am 12:05 AM

Different JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.

Beyond the Browser: JavaScript in the Real WorldApr 12, 2025 am 12:06 AM

JavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.

Building a Multi-Tenant SaaS Application with Next.js (Backend Integration)Apr 11, 2025 am 08:23 AM

I built a functional multi-tenant SaaS application (an EdTech app) with your everyday tech tool and you can do the same. First, what’s a multi-tenant SaaS application? Multi-tenant SaaS applications let you serve multiple customers from a sing

See all articles

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

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)

1 months agoBy尊渡假赌尊渡假赌尊渡假赌

R.E.P.O. Best Graphic Settings

1 months agoBy尊渡假赌尊渡假赌尊渡假赌

Assassin's Creed Shadows: Seashell Riddle Solution

3 weeks agoByDDD

What's New in Windows 11 KB5054979 & How to Fix Update Issues

2 weeks agoByDDD

Will R.E.P.O. Have Crossplay?

1 months agoBy尊渡假赌尊渡假赌尊渡假赌

Hot Tools

MinGW - Minimalist GNU for Windows

This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.