vue.js 2.0开发(3)

时间:2024-11-20 13:35:32

组件化

Vue.component('todo-items',{

});

定义组件,首先是标签的名字todo-items,然后里面还要配置一些选项,首先是我们的模板template,里面需要填入的内容使我们原生的html,这里我们中的是script标签添加,但是要注意它的type="text/x-template":

    <script type="text/x-template" id="todo-items-template">
<ul class="list-group">
<li class="list-group-item" v-for="(todo,index) in todos" v-bind:class="{'completed' : todo.completed}">
{{todo.title}}
<button class="btn btn-warning btn-xs pull-right" v-on:click="deleteTodo(index)">Delete</button>
<button class="btn btn-xs pull-right" v-on:click="toggleCompletion(todo)" v-bind:class="[todo.completed ? 'btn-success' : 'btn-danger']">{{todo.completed ? 'completed' : 'working'}}</button>
</li>
</ul>
</script>

然后在组件定义中以id的方式声明:

        Vue.component('todo-items',{
template:'#todo-items-template',
});

这样我们就可以使用todo-items这个标签了,刷新浏览器之后会报错vue.js 2.0开发(3)

这是因为我们在组件里面没有获取到我们初始化的todos,这里可以通过属性传递进来:

<todo-items :todos="todos"></todo-items>

这里的‘:’是必须的,这就是v-bind:的缩写,如果没有的话 这个todos就相当于字符串。还要去告诉我们的组件这个属性

     Vue.component('todo-items',{
template:'#todo-items-template',
props:['todos']
});

最后把我们组件的方法放进来,不然不可用

      Vue.component('todo-items',{
template:'#todo-items-template',
props:['todos'],
methods:{
deleteTodo(index){
this.todos.splice(index,1);//删除下标为index的元素
},
toggleCompletion(todo){
todo.completed = !todo.completed;
}
}
});

这样就可以了,现在我们把我们的form也做成组件,创建x-template跟上面的一样,定义组件

        Vue.component('todo-form',{
template:"#todo-add-form-template",
});

这样也是会报错

vue.js 2.0开发(3)

这里newTodo找不到事因为我们没有在组件中定义:

        Vue.component('todo-form',{
template:"#todo-add-form-template",
props:['todos'],
data(){
return {
newTodo:{id:null,title:"",completed:false}
}//定义一个obj;
},
methods:{
addTodo(newTodo){//es6
this.todos.push(newTodo);//把新的obj添加在数组中,
this.newTodo = {id:null,title:"",completed:false}//初始化newTodo
},
}
});

这里跟我们在初始化vue中的data定义的不一样,这里是用一个函数定义的。这里依然也用到了我们的todos。在template中除了使用x-template也可以把html以字符串的形式传入。

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>vue2.0</title>
<link rel="stylesheet" type="text/css" href="./css/bootstrap.min.css">
<style type="text/css">
.completed{
color: green;
font-style: italic;
}
</style>
</head>
<body>
<nav class="navbar navbar-default navbar-static-top"></nav>
<div class="container" id="app">
<div class="row">
<div class="col-md-8 col-md-offset-2">
<div class="panel panel-default">
<div class="panel-heading">welcome Vue 2.0</div>
<div class="panel-body">
<input type="text" name="" v-model="message" class="form-control">
<h1>{{message}} ({{todoCount}})</h1>
<todo-items :todos="todos"></todo-items>
<todo-form :todos="todos"></todo-form>
</div>
</div>
</div>
</div>
</div>
<script type="text/x-template" id="todo-items-template">
<ul class="list-group">
<li class="list-group-item" v-for="(todo,index) in todos" v-bind:class="{'completed' : todo.completed}">
{{todo.title}}
<button class="btn btn-warning btn-xs pull-right" v-on:click="deleteTodo(index)">Delete</button>
<button class="btn btn-xs pull-right" v-on:click="toggleCompletion(todo)" v-bind:class="[todo.completed ? 'btn-success' : 'btn-danger']">{{todo.completed ? 'completed' : 'working'}}</button>
</li>
</ul>
</script>
<script type="text/x-template" id="todo-add-form-template">
<form v-on:submit.prevent="addTodo(newTodo)">
<div class="form-group">
<input type="text" name="" class="form-gcontrol" placeholder="add a new todo" v-model="newTodo.title">
</div>
<div class="from-group">
<button class="btn btn-success" type="submit">add todo</button>
</div>
</form>
</script>
<script type="text/javascript" src="js/vue.js"></script>
<script type="text/javascript">
Vue.component('todo-items',{
template:'#todo-items-template',
props:['todos'],
methods:{
deleteTodo(index){
this.todos.splice(index,1);//删除下标为index的元素
},
toggleCompletion(todo){
todo.completed = !todo.completed;
}
}
});
Vue.component('todo-form',{
template:"#todo-add-form-template",
props:['todos'],
data(){
return {
newTodo:{id:null,title:"",completed:false}
}//定义一个obj;
},
methods:{
addTodo(newTodo){//es6
this.todos.push(newTodo);//把新的obj添加在数组中,
this.newTodo = {id:null,title:"",completed:false}//初始化newTodo
},
}
});
new Vue({
el:'#app',
data:{
message:'this is todos',
todos:[
{id:1,title:"learn vuejs",completed:false},
],
},
computed:{
todoCount(){
return this.todos.length;
}
},
});
</script>
</body>
</html>