鸿蒙ArkTs开发WebView问题总结

1. 加载WebView页面报错"Can not read properties of null (reading 'getltem')"

解决:

在加载webview的controller中加入.domStorageAccess(true)

 build() {
    Column() {
      Row().width('100%').height('50rpx')
      Web({ src: src, controller: this.controller })
        .javaScriptAccess(true)
        .domStorageAccess(true)
    }

  }

官方文档

文档中心

2.如何操作网页中的LocalStorage

解决:

通过操作应用侧runJavaScript()方法调用前端页面的JavaScript相关函数。

本人封装操作LocalStorage 方法

interface JsMethods {
  setStorage(key: string, value: any): Promise<void>;

  getStorage(key: string): Promise<string>
}
/**
 * webview中常用的js操作封装
 */
export class WebJsUtil implements JsMethods {
  private controller: WebviewController;

  constructor(controller: WebviewController) {
    this.controller = controller;
  }

  async setStorage(key: string, value: any): Promise<void> {
    this.controller.runJavaScript("window.localStorage.setItem('" + key + "', '" + value + "')")
  }

  async getStorage(key: string): Promise<string> {
    const res = await this.controller.runJavaScript("window.localStorage.getItem('" + key + "')")
    return res
  }
}

调用:

 build() {
    Column() {
      Row().width('100%').height('50rpx')
      Web({ src: new BaseUrl().APPOINT_LIST, controller: this.controller })
        .javaScriptAccess(true)
        .onPageBegin(async (event) => {
          const access_token = await PreferenceModel.getPreference('access_token')
          const refresh_token = await PreferenceModel.getPreference('refresh_token')
          const webJs = new WebJsUtil(this.controller)
          await webJs.setStorage('userInfo', JSON.stringify(this.userInfo))
          await webJs.setStorage('access_token', access_token)
          await webJs.setStorage('refresh_token', refresh_token)
        })
        .domStorageAccess(true)
    }

  }

注: window.localStorage.setItem('" + key + "', '" + value + "') 必须在 value 外有两个单引号包含住