6-1. 自定義
通過Highway.extend抽取爲類,需指定標籤名
6-1-1. 全局
通過Highway.component指定
6-1-2. 局部
通過View.$components指定
6-1-3. 示例
<!-- examples/components/customized.html -->
<div id="app">
<p>i am {{name}}</p>
<my-component hi-ref="component" class="component"></my-component>
</div>
<script id="t-my-component" type="text/template">
<p>i am {{name}}</p>
</script>
const myComponent = Highway.extend({
$template: $('#t-my-component').html(),
$scope: {
name: 'component'
}
});
// 全局
//Highway.component('my-component', myComponent);
const app = new Highway({
$el: $('#app'),
$scope: {
name: 'app'
},
// 局部
$components: {
'my-component': myComponent
}
});
6-2. 引用
6-2-1. 子視圖
父視圖通過$refs[‘name’]獲取子視圖上下文,子視圖需指定hi-ref指令
<!-- examples/components/ref.html -->
<div id="app">
<p>i am {{name}}</p>
<my-component hi-ref="component" class="component"></my-component>
<button hi-on:click="getComponentName">getComponentName</button>
<button hi-on:click="triggerComponentHandler">triggerComponentHandler</button>
</div>
<script id="t-my-component" type="text/template">
<p>i am {{name}}, my parent is {{$parent.name}}</p>
</script>
const myComponent = Highway.extend({
$template: $('#t-my-component').html(),
$scope: {
name: 'component'
},
introduce() {
alert('hi, i am component');
}
});
const app = new Highway({
$el: $('#app'),
$scope: {
name: 'app'
},
$components: {
'my-component': myComponent
},
getComponentName() {
const $component = this.$components.$refs['component'];
alert($component.$get('name'));
},
triggerComponentHandler() {
const $component = this.$components.$refs['component'];
$component.introduce();
}
});
6-2-2. 父視圖
子視圖通過$parent獲得父視圖上下文
<!-- examples/components/parent.html -->
<div id="app">
<p>i am {{name}}</p>
<my-component class="component"></my-component>
</div>
<script id="t-my-component" type="text/template">
<p>i am {{name}}, my parent is {{$parent.name}}</p>
<button hi-on:click="getParentName">getParentName</button>
<button hi-on:click="triggerParentHandler">triggerParentHandler</button>
</script>
const myComponent = Highway.extend({
$template: $('#t-my-component').html(),
$scope: {
name: 'component'
},
getParentName() {
alert(this.$parent.$get('name'));
},
triggerParentHandler() {
this.$parent.introduce();
}
});
const app = new Highway({
$el: $('#app'),
$scope: {
name: 'app'
},
$components: {
'my-component': myComponent
},
introduce() {
alert('hi, i am app');
}
});
6-3. 通信
6-3-1. $on
監聽事件,需指定事件名與處理函數,返回停止監聽
<!-- examples/components/event.html -->
this.$on('app:event', this.eventHandler.bind(this));
// stop listening if stopper is called
//stopper()
6-3-2. $off
關閉監聽,需指定事件名與處理函數,如處理函數不指定,關閉在該事件上的所有處理器
<!-- examples/components/event.html -->
this.$off('app:event');
6-3-2. $broadcast
廣播事件,向子視圖發送通知消息
<!-- examples/components/event.html -->
this.$broadcast('app:event', 'this is event from app');
6-3-3. $emit
冒泡事件,向父視圖發送通知消息
<!-- examples/components/event.html -->
this.$emit('component:event', 'this is event from component');
6-3-4. $fire
觸發自身事件,並不會觸發
<!-- examples/components/event.html -->
this.$fire('component:self', 'this is event from self');
6-3-5. $listenTo
監聽指定對象事件,指定對象通過$fire觸發事件
<!-- examples/components/listen.html -->
const $component = this.$components.$refs['component'];
const stopper = this.$listenTo($component, 'component:event', this.eventHandler.bind(this));
// stop listening if stopper is called
//stopper()
6-3-6. $listenToOnce
監聽一次指定對象事件,指定對象通過$fire觸發事件
<!-- examples/components/listen.html -->
const stopper = this.$listenToOnce($component, 'component:event', this.eventHandler.bind(this));
// stop listening if stopper is called
//stopper()
6-3-7. $stopListening
取消監聽指定對象事件
<!-- examples/components/listen.html -->
const $component = this.$components.$refs['component'];
this.$stopListening($component, 'component:event');
6-4. 作用域鏈
視圖與子視圖作用域(不同於上下文)相互隔離,可通過$parent中獲取作用域
<!-- examples/components/scope.html -->
<div id="app">
<p>i am {{name}}</p>
<my-component class="component"></my-component>
</div>
<script id="t-my-component" type="text/template">
<p>i am {{name}}, my parent is {{$parent.name}}</p>
</script>
name屬性值只會從當前上下文作用域獲取值,如遇空值並不會自動向父組件尋找,如需向上尋找添加$parent前綴。
參考如下name取值
view- child | view-parent | hi, i am {{name}}, my parent is {{$parent.name}} |
---|---|---|
’ child’ | ‘parent’ | hi, i am child, my parent is parent |
undefined | ‘parent’ | hi, i am , my parent is parent |
‘child’ | undefined | hi, i am child, my parent is |
undefined | undefined | hi, i am , my parent is |
repeat指令會產生臨時作用域