Develop Reference

Ionic 4 Delete Page from History (Android)

Android devices has back button on menu toolbar. I want to disable the possibility when i login to my app and click on that back button to route on login page.
I want if user click on back button after login then i close the app.
Here is my initial code for routing below.
if (token) {
this.router.navigate(['/main-tabs/tabs/dashboard'])
} else {
this.router.navigate(['/login']).then();
}

I've tried many other answers but none of them really works for me. But this one works :
To disallow the login from going 'back' to the authenticated page after logged out, just do something like this in your app-routing.module.ts :
{
path: 'home',
loadChildren: './home/home.module#HomePageModule',
canActivate: [LoggedAuthGuard]
}
The same for the opposite (to prevent going back into login page with back button) :
{
path: 'login',
loadChildren: './login/login.module#LoginPageModule',
canActivate: [NotLoggedAuthGuard]
}
And both LoggedAuthGuard and NotLoggedAuthGuard must implement CanActivate. Sample code as below (with Promise, but it also works with boolean return) :
import { Injectable } from '#angular/core';
import {CanActivate} from "#angular/router";
import {Storage} from "#ionic/storage";
#Injectable({
providedIn: 'root'
})
export class LoggedAuthGuard implements CanActivate {
constructor(protected storage: Storage) { }
async canActivate() {
return (await !!this.storage.get('access_token'));
}
}
For the NotLoggedAuthGuard you just returns the opposite of LoggedAuthGuard.
async canActivate() {
return (await !this.storage.get('access_token'));
}
Hope this helps.

This answer provides a solution for removing the login page from the browser's history by replacing it with a page, that the user was navigated to after successful login. It might be a good and quick solution to:
I want to disable the possibility when i login to my app and click on
that back button to route on login page.

What I understood from your question is after user login, You don't want to navigate to login page if back button is clicked. If I understood your question correctly you can try below solution.
one approach is changing root page
this.navCtrl.setRoot(HomePage);
or
You can achieve this by removing page from stack after successful transition. Place below code inside Login success method
let currentIndex = this.navCtrl.getActive().index;
this.navCtrl.push(DestinationPage).then(() => {
this.navCtrl.remove(currentIndex);
});
Hope this helps you.

I think you can do like that :
this.platform.backButton.subscribe((()=>{
if(this.router.url == <insertpathhome>)
{
this.platform.exitApp();
}
else{
//go back
}
});

react-native Android Webview trigger clicks

I'm trying to trigger clicks on WebViews and want to open them for example in a new WebView to make a route flow. In iOS I can call the method onShouldStartLoadWithRequest and look at the event like this:
onShouldStartLoadWithRequest(e)
{
if(e.navigationType === "click")
{
}
}
On Android this function doesn't exists. Does someone know how to do something like this? Maybe you handle this in an other way but I really don't have a plan on this. Thanks for any advice

I solved this by routing the onNavigationStateChange function (which fires on Android), to my implementation of onShouldStartLoadingWithRequest:
onNavigationStateChange (req) {
if (Platform.OS !== 'ios') {
this.onShouldStartLoadWithRequest(req)
}
}
And:
onNavigationStateChange={this.onNavigationStateChange}
In this instance req contains the navigationType property. Remember to include Platform from react-native.

How to disable android back button handler in ONSEN-UI Phonegap?

I am developing a phonegap application in ONSEN-UI, in which I want to disable the android back button handler. I've tried Phonegap's backbutton hadler code to disable it. But I am unable to do it. Is there any other way to do it?
My Code:
document.addEventListener('deviceready', onDeviceReady, false);
function onDeviceReady() {
document.addEventListener("backbutton", function (e) {
e.preventDefault();
}, false);
}

This works for me in onsen2...I have it in my app.js
ons.ready(function () {
ons.disableDeviceBackButtonHandler();
document.addEventListener('backbutton', function () {}, false);
});

This is explained in Onsen UI docs: http://onsen.io/reference/ons.html#methods-summary
Just use the method ons.disableDeviceBackButtonHandler() and it will be disabled. You can use ons.enableDeviceBackButtonHandler() to enable it again.

Try to leave the function empty. This works perfect for me.
document.addEventListener("backbutton", androidBackKey, false);
var androidBackKey = function(){
//stay empty
};

Try this:
function onLoad()
{
document.addEventListener("deviceready",onDeviceReady,false);
}
function onDeviceReady()
{
document.addEventListener("backbutton",noth,false);
}
function noth()
{
}

Use this if you're using a navigator:
myNavigator.getDeviceBackButtonHandler().setListener( stopButton );
function stopButton(e) {
try{
myNavigator.popPage();
}
catch (err){
// event.callParentHandler();
console.log( "Stopping...." + e);
}
}
It's another listener handled by ONSEN-UI itself that quit the app. So add a listener attached to document will not stop the app from exiting. To understand it's flow, you may check out onsenui_all.js to check out the source code.

If someone useing onsenUI with VueJS
put this code in app's created or mounted method.
this.$ons.ready(() => {
this.$ons.disableDeviceBackButtonHandler();
document.addEventListener("backbutton", e => {
e.preventDefault();
e.stopPropagation();
}, false);
});

If you've been looking for what I'm looking for, that is disable Android back button exiting the app altogether back to launcher, but preserve back button functionality across the app (to back out to main menu or close a dialog for example), you may do it using that method:
ons.setDefaultDeviceBackButtonListener(function(event) {});
This method overrides default action (which would be normally executed if there's nothing other action to execute), which is normally to close the app in case of Cordova.
Source and more examples: https://onsen.io/v2/guide/cordova.html#device-back-button (there's example there that can show confirmation dialog and exit the app if user says yes)

Handle Android Back Button on Phonegap InAppBrowser

I would like to disable or override the Android Back button while I am navigating pages on the InAppBrowser. Can I add an event listener that can handle that?
EDIT:
Looking at the answer by #T_D below the solutions provided are the closest I could get to. It does not seem to be possible to override the button in InAppBrowser as all the PhoneGap tweaks stop working while navigating pages on this plugin. I was not able to find any other solution rather than modifying the API library. If there are any PhoneGap guys here and know something more, I 'll be glad to get some comment. Thanks.
The closest I got:
var ref = window.open('http://apache.org', '_blank', 'location=yes');
ref.addEventListener("backbutton", function () { })

According to the documentation the behaviour of the hardware back button can be configured now for the InAppBrowser:
hardwareback: set to yes to use the hardware back button to navigate backwards through the InAppBrowser's history. If there is no previous page, the InAppBrowser will close. The default value is yes, so you must set it to no if you want the back button to simply close the InAppBrowser.
Thanks to Kris Erickson.
So just update your InAppBrowser plugin if the backward navigation is the desired behaviour.
For more details see: https://github.com/apache/cordova-plugin-inappbrowser/pull/86

You can do it quite easily now (as of InAppBrowser version 0.3.3), but you will have to edit the Java files. Go to src/com/org/apache/corodova/inappbrowser directory and edit the InAppBrowserDialog.java:
Change
public void onBackPressed () {
if (this.inAppBrowser == null) {
this.dismiss();
} else {
// better to go through the in inAppBrowser
// because it does a clean up
this.inAppBrowser.closeDialog();
}
}
to
public void onBackPressed () {
if (this.inAppBrowser == null) {
this.dismiss();
} else {
if (this.inAppBrowser.canGoBack()) {
this.inAppBrowser.goBack();
} else {
this.inAppBrowser.closeDialog();
}
}
}
Then go to InAppBrowser and find the goBack function, change:
/**
* Checks to see if it is possible to go back one page in history, then does so.
*/
private void goBack() {
if (this.inAppWebView.canGoBack()) {
this.inAppWebView.goBack();
}
}
to
/**
* Checks to see if it is possible to go back one page in history, then does so.
*/
public void goBack() {
if (this.inAppWebView.canGoBack()) {
this.inAppWebView.goBack();
}
}
public boolean canGoBack() {
return this.inAppWebView.canGoBack();
}
And now the hardware back button will go back until there are no more backs to do. I really think this should be the default behavior in android since the Done button already closes the InAppBrowser window.

This worked for me in PhoneGap 2.7, help came from here, How do I disable Android Back button on one page and change to exit button on every other page
document.addEventListener("deviceready", onDeviceReady, false);
function onDeviceReady() {
document.addEventListener("backbutton", function (e) {
e.preventDefault();
}, false );
}

I was having this same issue and finally got it to work, I'll post the answer here in case it helps someone.
This is the code I use:
window.new_window = window.open(url, '_blank', 'location=no');
window.new_window.addEventListener("exit", function () {
window.new_window.close();
});
So the key basically is to attach the exit event, which gets called when the back button of the device is tapped.
BTW, I used cordova.js, and build my apps locally using the Cordova CLI, I don't know if that makes any difference, I mention it just in case.

EDIT NOTE: As far as I know, it's not possible to override the back-button for the InAppBrowser in PhoneGap. But I did my best searching for possible solutions...
There's an eventListener to override back-button in PhoneGap -doesn't work for InAppBrowser-
function onDeviceReady(){
document.addEventListener("backbutton", onBackKeyDown, false);
}
Alternative eventListener to override back-button -the OP said this didn't work either-
var ref = window.open('http://www.stackoverflow.com', '_blank', 'location=yes');
ref.addEventListener("backbutton", function () {
//logic here
})
Overriding the Back-button in an Activity -this is plain java, obviously didn't work in PhoneGap-
#Override
public void onBackPressed()
{
//logic here
}
Conclusion:
Above solutions didn't work, following links (this answer, this one and a third one) didn't help either. So it's highly possible that overriding the back-button for the InAppBrowser in PhoneGap is not possible. If someone does come up with a solution or if things changed for a new PhoneGap version feel free to let us know...
EDIT:
Installing this plugin may take you to closest solution:
cordova plugin add org.apache.cordova.inappbrowse
What this plugin will do, in WP8, it will overlay back/forward/close button on InAppBrowser whenever you open any link/page in it.
See this image:

Use jQuery mobile:
$(document).on('backbutton',
function(e){
e.preventDefault();
// YOUR CODE GOES HERE
});

Running Cordova 5.1.1 and when i load pages in the inappbroswer i like having the back button work until the inappbrowser exits back to my index.html page because it's blank and just sits there. So i used the following code to fix this. It exits the app when it exits the inappbrowser.
window.open = cordova.InAppBrowser.open;
var ref = window.open(url, '_blank', 'location=no');
ref.addEventListener('exit', function () {
navigator.app.exitApp();
});

As far as I know it's not possible to override or detect the back button from inAppBrowser. When you press the back button, inAppBrowser will hide and return control to the Phonegap page. You can catch this with the focus event on the window, (using jQuery) like
var browser = window.open('http://example.com', '_blank', 'location=no');
$(window).on('focus', function() {
browser.show();
});
to reopen the browser. You could then use browser.executeScript() to signal the webapp loaded in the browser, if you like.
Inspired by this forum post.

I know this question has an answer already but I post my answer for those who any of these answers didn't work for them(such as myself):
so I have a multi page app for android and IOS and I am using cordova 5.x and I added the code below in every page except the page I needed InAppBrowser:
delete window.open;
and then for the rest of the pages I used:
document.addEventListener("backbutton", onBackKeyDown, false);
function onBackKeyDown(event) {
// your code for handling back button comes here
}
for handling back button
note that: delete window.open; base on the documentation
manually restore the default behaviour of 'window.open'
after that InAppBrowser plugin worked great and I handled back button in all pages correctly.
one last thing don't forget to add:<script type="text/javascript" charset="utf-8" src="cordova.js"></script> in pages you need to have InAppBrowser.
hope this help.

prevent css/jquery popups from allowing links underneath to be clicked (mobile only)

so i have created !a simple popup using css and jquery. the problem is, when the popup is activated, links underneath the popup can still be clicked. is there any way to prevent this from happening. the click box for some of the links in the popup are small and one can easily click next to it which means the link underneath the popup is clicked.
the site i am working on: taxslayerplayer.com, look at it on an android and you will see what i mean. also, i have experienced this problem on many other websites while browsing on my phone.
any pointers would be appreciated, thanks!

I'm not sure about a strictly-mobile solution, but you could check for the pop-up being visible and, if it's visible, simply return false in the click-handler for links:
$('a').filter(
function(){
return !$(this).closest(popupSelector).length;
}).on('click', function(e){
if ($(popupSelector).is(':visible')) {
return false;
}
else {
// do whatever you'd normally do with the links
}
});
Alternatively, you could instead use a variable, for example popupIsShown, set it to false initially (on DOMReady), and then set it to true when the popup is shown, and reset to false when it's re-hidden, making the if check a little less expensive:
$('a').filter(
function(){
return !$(this).closest(popupSelector).length;
}).on('click', function(e){
if (popupIsShown) {
return false;
}
else {
// do whatever you'd normally do with the links
}
});

Use a boolean value and set it to false in case of pop-ups. It works!
PS : Just checked.. David has already answered it.