jQuery在单击时添加类，在单击另一个时删除

Question

我有这样的标记

<div class="personal-menu-content">
    <ul>
         <li><a data-menu-item="lessons" class="personal-menu-item lessons" href="#">Lessons</a></li>
         <li><a data-menu-item="profile" class="personal-menu-item profile" href="#">Edit Profile</a></li>
         <li><a data-menu-item="library" class="personal-menu-item library" href="#">Your Library</a></li>
    </ul>
</div>

<div class="contents">
    <div id="lessons">
        <h2>Lessons text here</h2>
        <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s</p>
    </div>
    <div id="profile">
        <h2>profile text here</h2>
        <p>It is a long established fact that a reader will be distracted by the readable content of a page when looking at its layout. The point of using Lorem Ipsum is that it has a more-or-less normal distribution of letters, as opposed to using 'Content here, content here', making it look like readable English.</p>
    </div>
    <div id="library">
        <h2>library text here</h2>
        <p>Contrary to popular belief, Lorem Ipsum is not simply random text. It has roots in a piece of classical Latin literature from 45 BC, making it over 2000 years old. Richard McClintock, a Latin professor at Hampden-Sydney College in Virginia, looked up one of the more obscure Latin words,</p>
    </div>
</div>

和这样的JS

$('div#profile').show();
    $('body').on('click','a.personal-menu-item', function(e) {
        e.preventDefault();
        var selectedItem = $(this).attr('data-menu-item');
        if(selectedItem == 'lessons') {
            $('div#lessons').show();
            $('div#profile').hide();
            $('div#library').hide();
        }
        if(selectedItem == 'profile') {
            $('div#lessons').hide();
            $('div#profile').show();
            $('div#library').hide();
        }
        if(selectedItem == 'library') {
            $('div#lessons').hide();
            $('div#profile').hide();
            $('div#library').show();
        }
    });

所以在这里我希望当我单击课程时，仅显示课程内容，例如当我单击配置文件和库时，仅显示配置文件和库。 在这里工作正常，但是我想知道如何在该锚标记中单击一个项目时添加一个活动类。 可以说，我单击课程，然后将一个活动类添加到课程锚标记中，当我单击配置文件时，应将活动类从课程锚标记中删除，然后将活动类添加到概要文件锚标记中。 到目前为止，这是我的小提琴

Answer 1

简短而甜蜜的方式。

$(".personal-menu-item").click(function(){

 $(".personal-menu-item").removeClass("active");
 $(this).addClass("active");

});

Answer 2

您可以在点击处理程序中使用this引用

 $('body').on('click.menu', 'a.personal-menu-item', function(e) { e.preventDefault(); var selectedItem = $(this).attr('data-menu-item'); var $selected = $('#' + selectedItem).show(); $('.contents > div').not($selected).hide(); $('.personal-menu-content .active').removeClass('active') $(this).addClass('active'); }); $('.personal-menu-content a[data-menu-item="profile"]').trigger('click.menu') 

 .contents > div { display: none; } .active { color: red; } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> <div class="personal-menu-content"> <ul> <li><a data-menu-item="lessons" class="personal-menu-item lessons" href="#">Lessons</a></li> <li><a data-menu-item="profile" class="personal-menu-item profile" href="#">Edit Profile</a></li> <li><a data-menu-item="library" class="personal-menu-item library" href="#">Your Library</a></li> </ul> </div> <div class="contents"> <div id="lessons"> <h2>Lessons text here</h2> <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s</p> </div> <div id="profile"> <h2>profile text here</h2> <p>It is a long established fact that a reader will be distracted by the readable content of a page when looking at its layout. The point of using Lorem Ipsum is that it has a more-or-less normal distribution of letters, as opposed to using 'Content here, content here', making it look like readable English.</p> </div> <div id="library"> <h2>library text here</h2> <p>Contrary to popular belief, Lorem Ipsum is not simply random text. It has roots in a piece of classical Latin literature from 45 BC, making it over 2000 years old. Richard McClintock, a Latin professor at Hampden-Sydney College in Virginia, looked up one of the more obscure Latin words,</p> </div> </div> 

Answer 3

基本上，将它们全部隐藏，然后仅显示所需的一个。 只需要更改两行即可：)

编辑：同样，删除所有活动的类，并将其仅添加到单击的类中。

$('body').on('click','a.personal-menu-item', function(e) {
    e.preventDefault();

    $('.personal-menu-content .active').removeClass('active')

    var selectedItem = $(this).addClass('active').attr('data-menu-item');

    $('.contents > div').hide();
    $('#' + selectedItem).show();
});

Answer 4

尝试这个

$('div#profile').show();
$('body').on('click','a.personal-menu-item', function(e) {
    e.preventDefault();
     var selectedItem = $(this).parent('li').index();
    alert(selectedItem);
     $('.contents div').hide();         
     $('.contents div').eq(selectedItem).show();
});

https://jsfiddle.net/pjdq1h83/