You can use a .js file in the ECMAScript compliant JavaScript language to define the service logic of an HML page. With dynamic typing, JavaScript can make your application more expressive with a flexible design. The following describes the JavaScript compilation and running.
The ECMAScript 6.0 syntax is supported. Lite wearables only support the following ECMAScript 6.0 syntax:
let/const
arrow functions
class
default value
destructuring assignment
destructuring binding pattern
enhanced object initializer
for-of
rest parameter
template strings
Module declaration
Import functionality modules.
import router from '@ohos.router';
Code reference
Import JavaScript code.
import utils from '../../common/utils.js';
| Attribute | Type | Description |
|---|---|---|
| data | Object/Function | Data model of the page. If the attribute is of the function type, the return value must be of the object type. The name cannot start with a dollar sign ($) or underscore (_). Do not use reserved words (for, if, show, and tid). |
| $refs | Object | DOM elements or child component instances that have registered the ref attribute. For an example, see Obtaining a DOM Element. |
Use $refs to obtain a DOM element.
<!-- index.hml -->
<div class="container">
<image-animator class="image-player" ref="animator" images="{{images}}" duration="1s" onclick="handleClick"></image-animator>
</div> // index.js
export default {
data: {
images: [
{ src: '/common/frame1.png' },
{ src: '/common/frame2.png' },
{ src: '/common/frame3.png' },
],
},
handleClick() {
const animator = this.$refs.animator; // Obtain the DOM element whose $refs attribute is animator.
const state = animator.getState();
if (state === 'paused') {
animator.resume();
} else if (state === 'stopped') {
animator.start();
} else {
animator.pause();
}
},
};