角度 – 离子2防止硬件后退按钮默认

按下硬件后退按钮时如何防止默认导航？我已经尝试了registerBackButtonAction,但它会覆盖我不想要的每个页面中的后退按钮的行为.

这也没有帮助.

document.addEventListener("backbutton",(event) => {
      event.preventDefault();
  },false);

正如您在 Ionic docs中看到的,registerBackButtonAction返回一个函数：

A function that,when called,will unregister its back button
action.

@H_301_13@

因此,您可以使用该功能在离开页面时恢复默认行为,如下所示：

import { Component} from '@angular/core';

@Component({
    selector: 'page-home',templateUrl: 'home.html'
})
export class HomePage {

    // Property used to store the callback of the event handler to unsubscribe to it when leaving this page
    public unregisterBackButtonAction: any;

    constructor(...) { ... }

    ionViewDidEnter() {
        this.initializeBackButtonCustomHandler();
    }

    ionViewWillLeave() {
        // Unregister the custom back button action for this page
        this.unregisterBackButtonAction && this.unregisterBackButtonAction();
    }

    public initializeBackButtonCustomHandler(): void {
        this.unregisterBackButtonAction = this.platform.registerBackButtonAction(() => {
            this.customHandleBackButton();
        },10);
    }

    private customHandleBackButton(): void {
        // do what you need to do here ...
    }
}

正如您所看到的,关键是存储registerBackButtonAction方法的回调并在以后离开页面时使用它(或者当您想要恢复默认行为时)：

this.unregisterBackButtonAction = this.platform.registerBackButtonAction(() => {
    this.customHandleBackButton();
},10);

原文链接：https://www.f2er.com/angularjs/143237.html

角度 – 离子2防止硬件后退按钮默认

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