Overview
Similar to Page, the customized components consist of four parts: axml, js, json and acss.
There are two steps to create a customized component:
- Declare the customized component in json. If it is dependent on other components, it is required to declare additionally the dependent customized components.
Sample code:
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{
"component": true, // mandate, the value for customized component must be true
"usingComponents": {
"c1":"../x/index"
}//Dependent component
}Parameter details:
| Parameter | Type | Required | Description |
| component | Boolean | Yes | Declare customized component. |
| usingComponents | Object | No | Path of the customized component in the dependence declaration Absolute project path starts with “/”, and relative path starts with “./” or “../” The npm path does not start with “/”. |
- Use the Component function to register the customized component. See Component constructor 。
Component parameter description:
| Parameter | Description | Document |
| onInit | Callback on creation | Component lifecycle. |
| deriveDataFromProps | Callback on creation and update | Component lifecycle. |
| data | local status | Same as Page (can be modified via setData and $spliceData). |
| props | Attribute transferred from outside | Component method and external attribute-props. |
| methods | Customized method | Component method and external attribute - methods. |
Sample code:
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// /components/customer/index.js
Component({
mixins: [], // minxin easy reuse code
data: { x: 1 }, // internal data of component
props: { y: 1 }, // Can add default to attribute transferred from outside
onInit() {}, // trigger on component creation, added in version 2.0.0
deriveDataFromProps(nextProps) {}, // trigger on component creation and before update, added in version 2.0.0
didMount(){}, // Lifecycle function
didUpdate(){},
didUnmount(){},
methods: { // customized method
handleTap() {
this.setData({ x: this.data.x + 1}); // Can use setData to change internal attribute
},
},
})in addition, the customized component supports slot and can build flexible page structure. See component template and style .
Sample code:
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<!-- // /components/customer/index.axml -->
<view>
<view>x: {{x}}</view>
<button onTap="handleTap">plusOne</button>
<slot>
<view>default slot & default value</view>
</slot>
</view>