Explanation of tab function in Bootstrap

Previous words

Tabs are a very common function in the Web. When the user clicks on the menu item, the corresponding content can be switched out. This article will introduce the Bootstrap tab in detail

Basic usage

The tab in the Bootstrap framework mainly consists of two parts:

　1. Tab The menu component corresponds to Bootstrap's nav-tabs

2. The switchable tab panel component is usually represented by tab-pane in Bootstrap

In the Bootstrap framework, tab nav- The tabs have styles, and the panel content tab-pane is hidden. Only the current panel content is displayed.

.tab-content > .tab-pane {display: none;
}.tab-content > .active {display: block;
}

The tab defines the data attribute to trigger the switching effect. Of course, the prerequisite is to load bootstrap.js or tab.js first. Declarative triggering tabs need to meet the following requirements:

1. Set data-toggle="tab"

in the tab navigation link 2. And set data-target=" corresponding The selector of the content panel (usually ID)"; if it is a link, you can also use href="the selector of the corresponding content panel (usually ID)". The main function is that the user can find the selector corresponding to it when clicking The panel content tab-pane.

3. The panel content is uniformly placed in the tab-content container, and each content panel tab-pane needs to set an independent selector (preferably ID) and the data-target or data-target in the tab. The value of href matches

<!-- 选项卡菜单--><ul id="myTab" class="nav nav-tabs" role="tablist"><li class="active"><a href="#bulletin" role="tab" data-toggle="tab">公告</a></li><li><a href="#rule" role="tab" data-toggle="tab">规则</a></li><li><a href="#forum" role="tab" data-toggle="tab">论坛</a></li><li><a href="#security" role="tab"  data-toggle="tab">安全</a></li><li><a href="#welfare" role="tab" data-toggle="tab">公益</a></li></ul><!-- 选项卡面板 --><div id="myTabContent" class="tab-content"><div class="tab-pane active" id="bulletin">公告内容面板</div><div class="tab-pane " id="rule">规则内容面板</div><div class="tab-pane " id="forum">论坛内容面板</div><div class="tab-pane " id="security">安全内容面板</div><div class="tab-pane " id="welfare">公益内容面板</div></div>

[Fade-in effect]

In order to make the hiding and display of the panel more effective during the switching process Smooth, you can add the class name fade in the panel to produce a gradual effect.

When adding the fade style, the initial default displayed content panel must be added with the in class name, otherwise the user will not be able to see its content

<!-- 选项卡菜单--><ul id="myTab" class="nav nav-tabs" role="tablist"><li class="active"><a href="#bulletin" role="tab" data-toggle="tab">公告</a></li><li><a href="#rule" role="tab" data-toggle="tab">规则</a></li><li><a href="#forum" role="tab" data-toggle="tab">论坛</a></li><li><a href="#security" role="tab"  data-toggle="tab">安全</a></li><li><a href="#welfare" role="tab" data-toggle="tab">公益</a></li></ul><!-- 选项卡面板 --><div id="myTabContent" class="tab-content"><div class="tab-pane fade in active" id="bulletin">公告内容面板</div><div class="tab-pane fade" id="rule">规则内容面板</div><div class="tab-pane fade" id="forum">论坛内容面板</div><div class="tab-pane fade" id="security">安全内容面板</div><div class="tab-pane fade" id="welfare">公益内容面板</div></div>

【Capsule Tab】

In Bootstrap, in addition to allowing nav-tabs to have the tab switching function, the capsule nav-pills navigation can also have the tab function. . Just replace nav-tabs with nav-pills. Another key point is to replace data-toggle="tab" with data-toggle="pill"

<!-- 选项卡菜单--><ul id="myTab" class="nav nav-pills" role="tablist"><li class="active"><a href="#bulletin" role="tab" data-toggle="pill">公告</a></li><li><a href="#rule" role="tab" data-toggle="pill">规则</a></li><li><a href="#forum" role="tab" data-toggle="pill">论坛</a></li><li><a href="#security" role="tab" data-toggle="pill">安全</a></li><li><a href="#welfare" role="tab" data-toggle="pill">公益</a></li></ul><!-- 选项卡面板 --><div id="myTabContent" class="tab-content"><div class="tab-pane fade in active" id="bulletin">公告内容面板</div><div class="tab-pane fade" id="rule">规则内容面板</div><div class="tab-pane fade" id="forum">论坛内容面板</div><div class="tab-pane fade" id="security">安全内容面板</div><div class="tab-pane fade" id="welfare">公益内容面板</div></div>

JS trigger

In addition to setting data-toggle in HTML to trigger tabs, you can also directly use JavaScript transfer.

Call the tab("show") method in the click event of each link to display the corresponding tab panel content. For the above example, delete the custom data-toggle="tab" or data-toggle="pill" attributes in HTML, and then call

$(function(){
    $("#myTab a").click(function(e){
        e.preventDefault();
        $(this).tab("show");
    });
})

公告
规则
论坛
安全
公益
公告内容面板
规则内容面板
论坛内容面板
安全内容面板
公益内容面板
<script>$(function(){
    $(&quot;#myTab a&quot;).click(function(e){
        e.preventDefault();
        $(this).tab(&quot;show&quot;);
    });
})</script>

through the following script

【Event Subscription】

show.bs.tab        show方法调用之后立即触发该事件
shown.bs.tab   　　 此事件在tab已经显示出来（并且同时在 CSS 过渡效果完成）之后被触发
hide.bs.tab        hide方法调用之后立即触发该事件。
hidden.bs.tab    　此事件在tab被隐藏（并且同时在 CSS 过渡效果完成）之后被触发

<!-- 选项卡菜单-->
<ul id="myTab" class="nav nav-pills" role="tablist">
    <li class="active"><a href="#bulletin" role="tab">公告</a></li>
    <li><a href="#rule" role="tab" >规则</a></li>
    <li><a href="#forum" role="tab" >论坛</a></li>
    <li><a href="#security" role="tab" >安全</a></li>
    <li><a href="#welfare" role="tab" >公益</a></li>
</ul>
<!-- 选项卡面板 -->
<div id="myTabContent" class="tab-content">
    <div class="tab-pane fade in active" id="bulletin">公告内容面板</div>
    <div class="tab-pane fade" id="rule">规则内容面板</div>
    <div class="tab-pane fade" id="forum">论坛内容面板</div>
    <div class="tab-pane fade" id="security">安全内容面板</div>
    <div class="tab-pane fade" id="welfare">公益内容面板</div>
</div>
<script>$(function(){
    $("#myTab a").click(function(e){
        e.preventDefault();
        $(this).tab("show");
    });
    $("#myTab").on("show.bs.tab",function(e){
         $(e.target).css('outline','1px solid black');    
    }).on("hide.bs.tab",function(e){
        $(e.target).css('outline','none');  
    })
})</script>

##JS source code

【1】IIFE

Use the immediate call function to prevent the code in the plug-in from leaking, thus forming a closed loop, and can only be expanded from jQuery’s fn

+function ($) {//使用es5严格模式'use strict';//}(window.jQuery);

【2】Initial settings

  var Tab = function (element) {//指定当前元素this.element = $(element)
  }  //版本号为3.3.7
  Tab.VERSION = '3.3.7'  //动画时间为150ms
  Tab.TRANSITION_DURATION = 150

【3】Plug-in core code

  //show()方法用于触发show事件，调用activate原型方法，触发shown事件
  Tab.prototype.show = function () {//当前tabvar $this    = this.element//找到最近的ulvar $ul      = $this.closest('ul:not(.dropdown-menu)')//找到data-target值var selector = $this.data('target')//如果data-target值不存在，查找href值if (!selector) {
      selector = $this.attr('href')      //IE7特殊处理  selector = selector && selector.replace(/.*(?=#[^\s]*$)/, '') 
    }//如果当前tab已经是活动状态了，即父元素li上已经有active样式的话，直接返回if ($this.parent('li').hasClass('active')) return//找到上一个元素，即上一个带有active样式的li里的a元素var $previous = $ul.find('.active:last a')//设置hide事件var hideEvent = $.Event('hide.bs.tab', {
      relatedTarget: $this[0]
    })//设置show事件var showEvent = $.Event('show.bs.tab', {
      relatedTarget: $previous[0]
    })//触发hide事件及show事件    $previous.trigger(hideEvent)
    $this.trigger(showEvent)//如果自定义回调中阻止了默认行为，则不再继续处理if (showEvent.isDefaultPrevented() || hideEvent.isDefaultPrevented()) return//要激活显示的面板，即target或href里的值所对应的元素var $target = $(selector)//高亮显示当前tabthis.activate($this.closest('li'), $ul)//显示对应的面板，并在回调里触发hidden及shown事件this.activate($target, $target.parent(), function () {
      $previous.trigger({
        type: 'hidden.bs.tab',
        relatedTarget: $this[0]
      })
      $this.trigger({
        type: 'shown.bs.tab',
        relatedTarget: $previous[0]
      })
    })
  }  //active样式的应用，面板的显示和隐藏，以及tab的高亮与反高亮
  Tab.prototype.activate = function (element, container, callback) {//查找当前容器所有有active样式的元素var $active    = container.find('> .active')//判断是使用回调还是动画var transition = callback      && $.support.transition      && ($active.length && $active.hasClass('fade') || !!container.find('> .fade').length)function next() {
      $active//去除其他元素的active样式.removeClass('active')//包括li元素里面的下拉菜单里的active样式也要去除.find('> .dropdown-menu > .active')
          .removeClass('active')
        .end()
        .find('[data-toggle="tab"]')
          .attr('aria-expanded', false)

      element//给当前被单击的元素添加active高亮样式.addClass('active')
        .find('[data-toggle="tab"]')
          .attr('aria-expanded', true)      if (transition) {//如果支持动画，就重绘页面element[0].offsetWidth //并添加in样式，去除透明element.addClass('in')
      } else {//否则删除fadeelement.removeClass('fade')
      }      //如果单击的是下拉菜单里的项目  if (element.parent('.dropdown-menu').length) {
        element          //打到最近的li.dropdown元素进行高亮  .closest('li.dropdown')
            .addClass('active')
          .end()
          .find('[data-toggle="tab"]')
            .attr('aria-expanded', true)
      }      //如果有回调就执行回调  callback && callback()
    }//如果支持动画$active.length && transition ?  $active//在动画结束后执行next().one('bsTransitionEnd', next)
        .emulateTransitionEnd(Tab.TRANSITION_DURATION) :
      next()

    $active.removeClass('in')
  }

【 4】jQuery plug-in definition

  function Plugin(option) {//根据选择器，遍历所有符合规则的元素return this.each(function () {      var $this = $(this)      //获取自定义属性bs.tab的值  var data  = $this.data('bs.tab')      //如果值不存在，则将Tab实例设置为bs.tab值  if (!data) $this.data('bs.tab', (data = new Tab(this)))      //如果option传递了string，则表示要执行某个方法    if (typeof option == 'string') data[option]()
    })
  }  var old = $.fn.tab  //保留其他库的$.fn.tab代码(如果定义的话)，以便在noConflict之后可以继续使用该老代码
  $.fn.tab             = Plugin  //重设插件构造器，可以通过该属性获取插件的真实类函数
  $.fn.tab.Constructor = Tab

【5】Anti-conflict processing

  $.fn.tab.noConflict = function () {     //恢复以前的旧代码$.fn.tab = old//将$.fn.tab.noConflict()设置为Bootstrap的Tab插件return this
  }

【6】Binding trigger event

  var clickHandler = function (e) {//阻止默认行为    e.preventDefault()//触发show()方法Plugin.call($(this), 'show')
  }

  $(document)//在document上绑定单击事件.on('click.bs.tab.data-api', '[data-toggle="tab"]', clickHandler)
    .on('click.bs.tab.data-api', '[data-toggle="pill"]', clickHandler)

　

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