我无法获取定位标记的父元素

Question

HTML code: HTML代码：

<ul class="nav nav-tabs">
    <li role="presentation" id="tab1" class="active"><a onclick="switchTabs(1)">Tab1</a></li>
    <li role="presentation" id="tab2"><a onclick="switchTabs(2)">Tab2</a></li>
</ul>

JS code: no error occurred while clicking, but not do switching JS代码：单击时未发生错误，但未进行切换

function switchTabs(idx) {
    // this is not working
    var $li = $(this).parent();
    if($li.hasClass('active')) {
        return false; // not enter here
    }
    $li.removeClass('active');
    if (idx === 1) {
        $li.next().addClass('active');
    } else {
        $li.prev().addClass('active');
    }

    // but this works while using id selector
    /*if (idx === 1) {
        $("#tab1").addClass('active');
        $("#tab2").removeClass('active');
    } else if(idx === 2) {
        $("#tab2").addClass('active');
        $("#tab1").removeClass('active');
    }*/
    return false;
}

What can be the reason? 可能是什么原因？

Answer 1

Try this approach I think that will be better solution for your case 尝试这种方法，我认为这将是针对您的案例的更好解决方案

 <html> <head> <meta charset="utf-8"/> </head> <style> .active { color: red; } </style> <body> <ul class="nav nav-tabs"> <li role="presentation" id="tab1" class="active"><a onclick="switchTabs(this)">Tab1</a></li> <li role="presentation" id="tab2"><a onclick="switchTabs(this)">Tab2</a></li> </ul> </body> <script src="https://code.jquery.com/jquery-3.4.1.js" integrity="sha256-WpOohJOqMqqyKL9FccASB9O0KwACQJpFTUBLTYOVvVU=" crossorigin="anonymous"></script> <script> function switchTabs(elm) { var $li = $(elm).parent(); if(!$li.hasClass('active')) { $li.addClass('active'); $li.siblings().removeClass('active'); } } </script>

Answer 2

Send the element into the function, and then you will have it's parent: 将元素发送到函数中，然后您将拥有它的父元素：

<a onclick="switchTabs(this,1)">

and then 接着

function switchTabs(elm,idx) {
// this is not working
  var $li = $(elm).parent();
  // Rest of your code...

Answer 3

Check this method to make it easier (and use the $(this) ) 检查此方法以使其更容易（并使用$(this) ）

 $(document).on('click','.nav li a', function(){ let tab = $(this).data('tab');//$(this) is the a clicked. $('.nav li.active').removeClass('active');//hide active Tab $('.nav li#tab'+tab).addClass('active');//show Tab })

 .active{font-size:20px;color:red}

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <ul class="nav nav-tabs"> <li role="presentation" id="tab1" class="active"><a data-tab="1">Tab1</a></li> <li role="presentation" id="tab2"><a data-tab="2">Tab2</a></li> </ul>

Answer 4

You are passing only index and not this object to switchTab function. 您仅将索引而不是该对象传递给switchTab函数。 You can make use of idx to get the clicked li and then put logic to add / remove active class. 您可以使用idx来获取单击的li，然后使用逻辑来添加/删除活动类。

See code below 见下面的代码

 function switchTabs(idx) { // this is not working //var $li = $(this).parent(); -- you are not passing this anywhere in the function hence it is not getting $('li').removeClass('active'); // remove all active var $li = $('#tab' + idx).addClass('active'); // use idx to create tab id of clicked li and add active class }

 .active { color: red; }

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.0/jquery.min.js"></script> <ul class="nav nav-tabs"> <li role="presentation" id="tab1" class="active"><a onclick="switchTabs(1)">Tab1</a></li> <li role="presentation" id="tab2"><a onclick="switchTabs(2)">Tab2</a></li> </ul>

我无法获取定位标记的父元素

问题描述

4 个解决方案

解决方案1
3 已采纳 2019-08-20 10:07:05

解决方案2
2 2019-08-20 09:58:13

解决方案3
0 2019-08-20 10:00:03

解决方案4
0 2019-08-20 10:20:20

我无法获取定位标记的父元素

问题描述

4 个解决方案

解决方案1 3 已采纳 2019-08-20 10:07:05

解决方案2 2 2019-08-20 09:58:13

解决方案3 0 2019-08-20 10:00:03

解决方案4 0 2019-08-20 10:20:20

解决方案1
3 已采纳 2019-08-20 10:07:05

解决方案2
2 2019-08-20 09:58:13

解决方案3
0 2019-08-20 10:00:03

解决方案4
0 2019-08-20 10:20:20