Things to note when using v-bind to bind classes in Vue.js
Preface
In Vue.js version: 1.0.27, when using the V-bind instruction in Vue.js to bind class and style, Vue.js has enhanced it. In addition to strings, expression results can also be objects or arrays.
I tested it here and found the following problem:
If you use object syntax to bind a class, the class name must be added with quotation marks, representing the corresponding style, otherwise it will be regarded as an attribute of the object, causing an initialization error.
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<script src="http://cdn.bootcss.com/vue/1.0.27/vue.js"></script>
<style>
.static {
font-size: 120px;
width: 600px;
margin: 0 auto;
background-color: yellow;
height: 120px;
line-height: 120px;
text-align: center;
}
.class-a {
color: #FF0000;
}
.class-b {
text-decoration: underline;
}
</style>
</head>
<body>
<div id="app">
<div v-bind:class="classObject">
关于class的绑定
</div>
</div>
<script>
var vm = new Vue({
el: '#app',
data: {
classObject: {
//'class-a',不能写成class-a（不带引号）；这里的classObject是js对象，而class-b是代表的是一个样式，所以必须写成'class-a',用引号括起来。
//否则这里的class-a只能代表classObject的一个属性名称而已，这样vuejs在初始化时，会报错。
'class-a':false,
'class-b': true
}
}
});
</script>
</body>
</html>Reference materials:
Vue.js official website----http://cn.vuejs.org/guide/class-and-style.html
Supplement:
Here, I feel that the classObject in the code is a bit like a hash table. The key is a style class, and the value is a boolean type value.
Get and change the class-a value in the classObject object from the console, see the picture below:
See the operation in the console, let me I feel that classObject is indeed a bit like a hash table type. In order to confirm this, you can take a look at the source code (ps: I didn’t look at it myself).
In Vue.js1.0.19, the author added some syntax to it. Object syntax can also be used in arrays:
Above, you can add or not add quotes for classA. The following is your own test code.
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<script src="http://cdn.bootcss.com/vue/1.0.27/vue.js"></script>
<style>
.static {
font-size: 120px;
width: 600px;
margin: 0 auto;
background-color: yellow;
height: 120px;
line-height: 120px;
text-align: center;
}
.class-a {
color: #FF0000;
}
.classB {
text-decoration: underline;
}
.classC{
text-shadow: 2px 2px 4px #000000;
}
</style>
</head>
<body>
<div id="app">
<!-- 两种绑定：加引号和不加引号，都可以 -->
<div v-bind:class="[classA, { 'classB': isB, 'classC': isC }]">class绑定</div>
<div v-bind:class="[classA, { classB: isB, classC: isC }]">class绑定</div>
</div>
<script>
var vm = new Vue({
el: '#app',
data: {
classA: 'class-a',
isB: true,
isC: true
}
});
</script>
</body>
</html>Summary
The above is the entire content of this article. I hope the content of this article can bring some help to everyone's study or work. If you have any questions, you can leave a message to communicate.
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