单击Vue.js切换类

Question 1

如何在vue.js中切换类？

我有以下内容：

<th class="initial " v-on="click: myFilter">
    <span class="wkday">M</span>
</th>

new Vue({
  el: '#my-container',
  data: {},
  methods: {
    myFilter: function(){
      // some code to filter users
    }
  }
});

当我单击时，th我想按以下方式申请active课程：

<th class="initial active" v-on="click: myFilter">
    <span class="wkday">M</span>
</th>

这需要切换，即每次单击它都需要添加/删除类。

Question 2

您可以使活动类依赖于布尔数据值：

<th 
  class="initial " 
  v-on="click: myFilter"
  v-class="{active: isActive}">
  <span class="wkday">M</span>
</th>

new Vue({
  el: '#my-container',

  data: {
    isActive: false
  },

  methods: {
    myFilter: function() {
      this.isActive = !this.isActive;
      // some code to filter users
    }
  }
})

Question 3

不需要方法：

// html element
<div id="mobile-toggle"
 v-bind:class="{ active: showMobileMenu }"
 v-on:click="showMobileMenu = !showMobileMenu">
</div>

//in your vue.js app
data: {
    showMobileMenu: false
}

Question 4

如果您不需要从元素外部访问切换，则此代码无需数据变量即可工作：

<a @click="e => e.target.classList.toggle('active')"></a>

Question 5

此答案与 Vue.js version 2

<th 
  class="initial " 
  v-on:click="myFilter"
  v-bind:class="{ active: isActive }"
>
  <span class="wkday">M</span>
</th>

Douglas的其余答案仍然适用（使用设置新的Vue实例isActive: false，等等）。

相关文档：https : //vuejs.org/v2/guide/class-and-style.html#Object-Syntax和https://vuejs.org/v2/guide/events.html#Method-Event-Handlers

Question 6

此示例使用列表：在某些位置单击时，它变为红色

的HTML：

<div id="app">
  <ul>
    <li @click="activate(li.id)" :class="{ active : active_el == li.id }" v-for="li in lista">{{li.texto}}</li>   
  </ul>
</div>

JS：

var app = new Vue({
  el:"#app",
  data:{
    lista:[{"id":"1","texto":"line 1"},{"id":"2","texto":"line 2"},{"id":"3","texto":"line 3"},{"id":"4","texto":"line 4"},{"id":"5","texto":"line 5"}],
    active_el:0
  },
  methods:{
    activate:function(el){
        this.active_el = el;
    }
  }
});

的CSS

ul > li:hover {
  cursor:pointer;
}
.active {
  color:red;
  font-weight:bold;
}

小提琴：

https://jsfiddle.net/w37vLL68/158/

Question 7

除了NateW的答案外，如果CSS类名称中带有连字符，则应将该类包装在（单引号）内：

<th 
  class="initial " 
  v-on:click="myFilter"
  v-bind:class="{ 'is-active' : isActive}"
>

 <span class="wkday">M</span>
 </th>

有关此主题的更多信息，请参见本主题。

Question 8

1。

@click="$event.target.classList.toggle('active')"

2。

:class="{ active }"
@click="active = !active"

3。

:class="'initial ' + (active ? 'active' : '')"  
@click="active = !active"

4。

:class="['initial', { active }]"  
@click="active = !active"

参考链接：https : //vuejs.org/v2/guide/class-and-style.html

演示：

new Vue({
  el: '#app1'
});

new Vue({
  el: '#app2',
  data: { active: false }
});

new Vue({
  el: '#app3',
  data: { active: false }
});

new Vue({
  el: '#app4',
  data: { active: false }
});

.initial {
  width: 300px;
  height: 100px;
  background: gray;
}

.active {
  background: red;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>

<!-- directly manipulation: not recommended -->
<div id="app1">
    <button 
      class="initial"  
      @click="$event.target.classList.toggle('active')"
    >$event.target.classList.toggle('active')</button>
</div>

<!-- binding by object -->
<div id="app2">
    <button 
      class="initial"  
      :class="{ active }"
      @click="active = !active"
    >class="initial" :class="{ active }"</button>
</div>

<!-- binding by expression -->
<div id="app3">
    <button 
      :class="'initial ' + (active ? 'active' : '')"  
      @click="active = !active"
    >'initial ' + (active ? 'active' : '')</button>
</div>

<!-- binding with object combined array -->
<div id="app4">
    <button 
      :class="['initial', { active }]"  
      @click="active = !active"
    >['initial', { active }]</button>
</div>

展开摘要

Question 9

如果您需要超过一堂课

你可以这样做：

<i id="icon" 
  v-bind:class="{ 'fa fa-star': showStar }"
  v-on:click="showStar = !showStar"
  >
</i> 

data: {
  showStar: true
}

注意类周围的单引号！

感谢其他所有人的解决方案。

Question 10

我有一个解决方案，允许您检查道具的不同值，因此不同的<th>元素将变为活动/非活动状态。使用vue 2语法。

<th 
class="initial " 
@click.stop.prevent="myFilter('M')"
:class="[(activeDay == 'M' ? 'active' : '')]">
<span class="wkday">M</span>
</th>
...
<th 
class="initial " 
@click.stop.prevent="myFilter('T')"
:class="[(activeDay == 'T' ? 'active' : '')]">
<span class="wkday">T</span>
</th>



new Vue({
  el: '#my-container',

  data: {
      activeDay: 'M'
  },

  methods: {
    myFilter: function(day){
        this.activeDay = day;
      // some code to filter users
    }
  }
})

Question 11

对于nuxt链接和bootstrap v5 navbar-nav，我使用了子组件

             <nuxt-link
              @click.prevent.native="isDropdwonMenuVisible = !isDropdwonMenuVisible"
              to=""
              :title="item.title"
              :class="[item.cssClasses, {show: isDropdwonMenuVisible}]"
              :id="`navbarDropdownMenuLink-${index}`"
              :aria-expanded="[isDropdwonMenuVisible ? true : false]"
              class="nav-link dropdown-toggle"
              aria-current="page"
              role="button"
              data-toggle="dropdown"
            >
              {{ item.label }}
            </nuxt-link>

data() {
    return {
      isDropdwonMenuVisible: false
    }
  },

Question 12

new Vue({
  el: '#fsbar',
  data:{
    isActive: false
  },
  methods: {
    toggle: function(){
      this.isActive = !this.isActive;
    }
  }
});

/*
    DEMO STYLE
*/
@import "https://fonts.googleapis.com/css?family=Poppins:300,400,500,600,700";


body {
    font-family: 'Poppins', sans-serif;
    background: #fafafa;
}

p {
    font-family: 'Poppins', sans-serif;
    font-size: 1.1em;
    font-weight: 300;
    line-height: 1.7em;
    color: #999;
}

a, a:hover, a:focus {
    color: inherit;
    text-decoration: none;
    transition: all 0.3s;
}

.navbar {
    padding: 15px 10px;
    background: #fff;
    border: none;
    border-radius: 0;
    margin-bottom: 40px;
    box-shadow: 1px 1px 3px rgba(0, 0, 0, 0.1);
}

.navbar-btn {
    box-shadow: none;
    outline: none !important;
    border: none;
}

.line {
    width: 100%;
    height: 1px;
    border-bottom: 1px dashed #ddd;
    margin: 40px 0;
}

i, span {
    display: inline-block;
}

/* ---------------------------------------------------
    SIDEBAR STYLE
----------------------------------------------------- */
.wrapper {
    display: flex;
    align-items: stretch;
}

#sidebar {
    min-width: 250px;
    max-width: 250px;
    background: #7386D5;
    color: #fff;
    transition: all 0.3s;
}

#sidebar.active {
    min-width: 80px;
    max-width: 80px;
    text-align: center;
}

#sidebar.active .sidebar-header h3, #sidebar.active .CTAs {
    display: none;
}

#sidebar.active .sidebar-header strong {
    display: block;
}

#sidebar ul li a {
    text-align: left;
}

#sidebar.active ul li a {
    padding: 20px 10px;
    text-align: center;
    font-size: 0.85em;
}

#sidebar.active ul li a i {
    margin-right:  0;
    display: block;
    font-size: 1.8em;
    margin-bottom: 5px;
}

#sidebar.active ul ul a {
    padding: 10px !important;
}

#sidebar.active a[aria-expanded="false"]::before, #sidebar.active a[aria-expanded="true"]::before {
    top: auto;
    bottom: 5px;
    right: 50%;
    -webkit-transform: translateX(50%);
    -ms-transform: translateX(50%);
    transform: translateX(50%);
}

#sidebar .sidebar-header {
    padding: 20px;
    background: #6d7fcc;
}

#sidebar .sidebar-header strong {
    display: none;
    font-size: 1.8em;
}

#sidebar ul.components {
    padding: 20px 0;
    border-bottom: 1px solid #47748b;
}

#sidebar ul li a {
    padding: 10px;
    font-size: 1.1em;
    display: block;
}
#sidebar ul li a:hover {
    color: #7386D5;
    background: #fff;
}
#sidebar ul li a i {
    margin-right: 10px;
}

#sidebar ul li.active > a, a[aria-expanded="true"] {
    color: #fff;
    background: #6d7fcc;
}


a[data-toggle="collapse"] {
    position: relative;
}

a[aria-expanded="false"]::before, a[aria-expanded="true"]::before {
    content: '\e259';
    display: block;
    position: absolute;
    right: 20px;
    font-family: 'Glyphicons Halflings';
    font-size: 0.6em;
}
a[aria-expanded="true"]::before {
    content: '\e260';
}


ul ul a {
    font-size: 0.9em !important;
    padding-left: 30px !important;
    background: #6d7fcc;
}

ul.CTAs {
    padding: 20px;
}

ul.CTAs a {
    text-align: center;
    font-size: 0.9em !important;
    display: block;
    border-radius: 5px;
    margin-bottom: 5px;
}

a.download {
    background: #fff;
    color: #7386D5;
}

a.article, a.article:hover {
    background: #6d7fcc !important;
    color: #fff !important;
}



/* ---------------------------------------------------
    CONTENT STYLE
----------------------------------------------------- */
#content {
    padding: 20px;
    min-height: 100vh;
    transition: all 0.3s;
}


/* ---------------------------------------------------
    MEDIAQUERIES
----------------------------------------------------- */
@media (max-width: 768px) {
    #sidebar {
        min-width: 80px;
        max-width: 80px;
        text-align: center;
        margin-left: -80px !important ;
    }
    a[aria-expanded="false"]::before, a[aria-expanded="true"]::before {
        top: auto;
        bottom: 5px;
        right: 50%;
        -webkit-transform: translateX(50%);
        -ms-transform: translateX(50%);
        transform: translateX(50%);
    }
    #sidebar.active {
        margin-left: 0 !important;
    }

    #sidebar .sidebar-header h3, #sidebar .CTAs {
        display: none;
    }

    #sidebar .sidebar-header strong {
        display: block;
    }

    #sidebar ul li a {
        padding: 20px 10px;
    }

    #sidebar ul li a span {
        font-size: 0.85em;
    }
    #sidebar ul li a i {
        margin-right:  0;
        display: block;
    }

    #sidebar ul ul a {
        padding: 10px !important;
    }

    #sidebar ul li a i {
        font-size: 1.3em;
    }
    #sidebar {
        margin-left: 0;
    }
    #sidebarCollapse span {
        display: none;
    }
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">

        <title>Collapsible sidebar using Bootstrap 3</title>

         <!-- Bootstrap CSS CDN -->
        <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
        <!-- Our Custom CSS -->
        <link rel="stylesheet" href="style4.css">
    </head>
    <body>



        <div class="wrapper" id="fsbar">
            <!-- Sidebar Holder -->
            <nav id="sidebar" :class="{ active: isActive }">
                <div class="sidebar-header">
                    <h3>Bootstrap Sidebar</h3>
                    <strong>BS</strong>
                </div>

                <ul class="list-unstyled components">
                    <li class="active">
                        <a href="#homeSubmenu" data-toggle="collapse" aria-expanded="false">
                            <i class="glyphicon glyphicon-home"></i>
                            Home
                        </a>
                        <ul class="collapse list-unstyled" id="homeSubmenu">
                            <li><a href="#">Home 1</a></li>
                            <li><a href="#">Home 2</a></li>
                            <li><a href="#">Home 3</a></li>
                        </ul>
                    </li>
                    <li>
                        <a href="#">
                            <i class="glyphicon glyphicon-briefcase"></i>
                            About
                        </a>
                        <a href="#pageSubmenu" data-toggle="collapse" aria-expanded="false">
                            <i class="glyphicon glyphicon-duplicate"></i>
                            Pages
                        </a>
                        <ul class="collapse list-unstyled" id="pageSubmenu">
                            <li><a href="#">Page 1</a></li>
                            <li><a href="#">Page 2</a></li>
                            <li><a href="#">Page 3</a></li>
                        </ul>
                    </li>
                    <li>
                        <a href="#">
                            <i class="glyphicon glyphicon-link"></i>
                            Portfolio
                        </a>
                    </li>
                    <li>
                        <a href="#">
                            <i class="glyphicon glyphicon-paperclip"></i>
                            FAQ
                       isActive: false, </a>
                    </li>
                    <li>
                        <a href="#">
                            <i class="glyphicon glyphicon-send"></i>
                            Contact
                        </a>
                    </li>
                </ul>

                <ul class="list-unstyled CTAs">
                    <li><a href="https://bootstrapious.com/tutorial/files/sidebar.zip" class="download">Download source</a></li>
                    <li><a href="https://bootstrapious.com/p/bootstrap-sidebar" class="article">Back to article</a></li>
                </ul>
            </nav>

            <!-- Page Content Holder -->
            <div id="content">

                <nav class="navbar navbar-default">
                    <div class="container-fluid">

                        <div class="navbar-header">
                            <button type="button" id="sidebarCollapse" class="btn btn-info navbar-btn" @click="toggle()">
                                <i class="glyphicon glyphicon-align-left"></i>
                                <span>Toggle Sidebar</span>
                            </button>
                        </div>

                        <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
                            <ul class="nav navbar-nav navbar-right">
                                <li><a href="#">Page</a></li>
                                <li><a href="#">Page</a></li>
                                <li><a href="#">Page</a></li>
                                <li><a href="#">Page</a></li>
                            </ul>
                        </div>
                    </div>
                </nav>

                <h2>Collapsible Sidebar Using Bootstrap 3</h2>
                <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
                <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>

                <div class="line"></div>

                <h2>Lorem Ipsum Dolor</h2>
                <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>

                <div class="line"></div>

                <h2>Lorem Ipsum Dolor</h2>
                <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>

                <div class="line"></div>

                <h3>Lorem Ipsum Dolor</h3>
                <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
            </div>
        </div>





        <!-- jQuery CDN -->
         <script src="https://code.jquery.com/jquery-1.12.0.min.js"></script>
         <!-- Bootstrap Js CDN -->
         <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>

        /<script type="text/javascript">
         //    $(document).ready(function () {
          //       $('#sidebarCollapse').on('click', function () {
           //          $('#sidebar').toggleClass('active');
            //     });
            // }); jquery equivalent to vue
         </script>
    </body>
</html>

展开摘要

Question 13

尝试：

<template>
   <th :class="'initial '+ active" v-on="click: myFilter">
       <span class="wkday">M</span>
   </th>  
</template>

<script lang="ts">

    active:string=''
    myFilter(){
       this.active='active'
    }
</script>

<style>
  .active{
     /***your action***/
   }

</style>