[英]How to handle hardware back button in PWA developed using Ionic3
我使用Ionic 3開發了一個PWA(基於Tab)。它在Android瀏覽器中按下硬件后退按鈕或瀏覽器后退按鈕之前工作正常。 如果它從主屏幕運行,按回硬件將關閉應用程序。 如果應用程序在android中運行chrome(僅在chrome中測試),硬件返回或瀏覽器的后面將重新加載PWA的第一頁,而不是之前訪問過的頁面。 如何在Ionic 3 PWA中處理這些事件?
我正在為所有頁面使用延遲加載。
到目前為止我嘗試了什么:
按照jgw96的評論在這里 ,我想IonicPage將處理導航本身。 但它沒有用。
使用platform.registerBackButtonAction,但它不適用於PWA。
根據Webruster在Answers中的建議,在app.component.ts中嘗試了代碼。 但沒有變化。
發布代碼:
import { Component, ViewChild } from '@angular/core';
import { Nav, Platform, AlertController, Alert, Events, App, IonicApp, MenuController } from 'ionic-angular';
@Component({
templateUrl: 'app.html'
})
export class MyApp {
@ViewChild(Nav) nav: Nav;
rootPage:any = 'TabsPage';
constructor(public platform: Platform,
public alertCtrl: AlertController, public events: Events,
public menu: MenuController,
private _app: App,
private _ionicApp: IonicApp) {
platform.ready().then(() => {
this.configureBkBtnprocess ();
});
}
configureBkBtnprocess() {
if (window.location.protocol !== "file:") {
window.onpopstate = (evt) => {
if (this.menu.isOpen()) {
this.menu.close ();
return;
}
let activePortal = this._ionicApp._loadingPortal.getActive() ||
this._ionicApp._modalPortal.getActive() ||
this._ionicApp._toastPortal.getActive() ||
this._ionicApp._overlayPortal.getActive();
if (activePortal) {
activePortal.dismiss();
return;
}
if (this._app.getRootNav().canGoBack())
this._app.getRootNav().pop();
};
this._app.viewDidEnter.subscribe((app) => {
history.pushState (null, null, "");
});
}
}
}
你已經提到你正在使用應用程序和瀏覽器中的硬件后退按鈕,所以你沒有清楚地提到在什么階段需要做什么,所以我提出了在大多數情況下都有用的通用解決方案
app.component.ts
platform.ready().then(() => {
// your other plugins code...
this.configureBkBtnprocess ();
});
configureBkBtnprocess
private configureBkBtnprocess () {
// If you are on chrome (browser)
if (window.location.protocol !== "file:") {
// Register browser back button action and you can perform
// your own actions like as follows
window.onpopstate = (evt) => {
// Close menu if open
if (this._menu.isOpen()) {
this._menu.close ();
return;
}
// Close any active modals or overlays
let activePortal = this._ionicApp._loadingPortal.getActive() ||
this._ionicApp._modalPortal.getActive() ||
this._ionicApp._toastPortal.getActive() ||
this._ionicApp._overlayPortal.getActive();
if (activePortal) {
activePortal.dismiss();
return;
}
// Navigate back
if (this._app.getRootNav().canGoBack())
this._app.getRootNav().pop();
}
else{
// you are in the app
};
// Fake browser history on each view enter
this._app.viewDidEnter.subscribe((app) => {
history.pushState (null, null, "");
});
解決方案2嘗試在平台准備中添加這些事件偵聽器:
window.addEventListener('load', function() { window.history.pushState({}, '')
})
window.addEventListener('popstate', function() { window.history.pushState({},
'') })
我有幾乎相同的要求,但沒有一個解決方案完全有效,所以我想出了自己的。 在這里,我使用了一個數組來跟蹤訪問過的頁面,並在后退點擊事件中刪除它。
注意:即使在推送新頁面時也會調用window.onpopstate
import { Platform, Nav } from "ionic-angular";
import { HomePage } from "../pages/home/home";
@Component({
templateUrl: "app.html"
})
export class MyApp {
rootPage: any;
@ViewChild(Nav) nav: Nav;
pageHistory: string[] = [];//to track page history
constructor(
platform: Platform,
statusBar: StatusBar,
splashScreen: SplashScreen
) {
window.addEventListener("load", function() {
//adding a state to prevent app exit on back
window.history.pushState({ noBackExitsApp: true }, "");
});
platform.ready().then(() => {
window.onpopstate = evt => {
let view = this.nav.getActive();
if (this.pageHistory.find(x => x === view.name)) {
if (!view.name.startsWith("Home")) {//handle a condition where you want to go back
this.pageHistory = this.pageHistory.filter(n => n !== view.name);
this.nav.pop().catch(reason => {
console.log("Unable to pop :" + reason);
});
}
} else {
window.history.pushState({ noBackExitsApp: true }, "");
this.pageHistory.push(view.name);
}
};
this.rootPage = HomePage;
statusBar.styleDefault();
splashScreen.hide();
});
}
}
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