【HarmonyOS】Web组件同步与异步数据获取
Web组件交互同步与异步获取数据的方式示例
【html测试文件】src/main/resources/rawfile/Page04.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<script>
let isEnvSupported = 'CSS' in window && typeof CSS.supports === 'function' &&
(CSS.supports('top: env(a)') || CSS.supports('top: constant(a)'));
document.write(`<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0${isEnvSupported ? ', viewport-fit=cover' : ''}">`);
</script>
<title>Page Title</title>
<link rel="stylesheet" href="mycss.css">
<link rel="icon" href="./static/favicon.ico">
</head>
<body>
<button onclick="fetchSyncData()">获取同步数据</button>
<button onclick="fetchAsyncData()">获取异步数据</button>
<p id="dataDisplay"></p>
</body>
<script>
function fetchSyncData() {
console.log('开始获取同步数据');
const result = window.hm.getTestData("测试数据");
document.getElementById("dataDisplay").textContent = result;
console.log('完成获取同步数据');
}
function fetchAsyncData() {
console.log('开始获取异步数据');
window.hm.getTestDataAsync("测试数据").then(value => {
document.getElementById("dataDisplay").textContent = value;
console.log('完成获取异步数据');
});
}
</script>
</html>【使用示例】src/main/ets/pages/Page04.ets
import web_webview from '@ohos.web.webview';
import dataPreferences from '@ohos.data.preferences';
class WebService {
context: Context
constructor(context: Context) {
this.context = context
}
getTestData = (input: string): string => {
console.info('输入数据:', input);
const resultMap = new Map<string, string>();
resultMap[input] = "我是value";
return JSON.stringify(resultMap);
}
getTestDataAsync = async (input: string): Promise<string> => {
console.info('输入数据:', input);
const preferences = await dataPreferences.getPreferences(this.context, 'DATA_STORE');
const value = await preferences.get('KEY', '默认值');
console.info('读取到的值:', value);
const resultMap = new Map<string, string>();
resultMap[input] = value;
return JSON.stringify(resultMap);
}
}
@Entry
@Component
struct Page04 {
controller: web_webview.WebviewController = new web_webview.WebviewController();
webService: WebService = new WebService(getContext(this));
methodList: Array<string> = []
aboutToAppear(): void {
this.methodList.splice(0) //清空原数组
console.info('====this.testObjtest', JSON.stringify(this.webService))
Object.keys(this.webService).forEach((key) => {
this.methodList.push(key)
console.info('====key', key)
});
}
build() {
Column() {
Web({
src: $rawfile('Page04.html'),
// src: 'https://xxx',
controller: this.controller
})
.width('100%')
.height('100%')
.domStorageAccess(true)//设置是否开启文档对象模型存储接口（DOM Storage API）权限。
.javaScriptAccess(true)//设置是否允许执行JavaScript脚本，默认允许执行。
.databaseAccess(true)//设置是否开启数据库存储API权限，默认不开启。
.mixedMode(MixedMode.All)//HTTP和HTTPS混合
.javaScriptProxy({
name: "hm",
object: this.webService,
methodList: this.methodList,
controller: this.controller,
})
}
.width('100%')
.height('100%')
}
}
原文地址：https://blog.csdn.net/zhongcongxu01/article/details/142550090
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