Ionic 4 back button callback method executing twice

0

I am using ionic platform backbutton to over ride the hardware back button functionality. Its working fine to load the previous page but its calling the callback method of backbutton subscribeWithPriority twice. So if i display the pop up in callback method, that pop up is displaying twice which is very annoying. Below is the code i have added in constructor of my app module.

I am only using this back button subscription at one place in my app and that is the main app module as i wanted to show the exit popup msg to user when back button is pressed.

Below is the code for back button subscription:

this.backBtnSubscriber = this.platform.backButton

    .subscribeWithPriority(9999,

      () => {

        this.alertDialogService.presentAlert();

      });

Details about my ionic version are below:

Ionic:



   ionic (Ionic CLI)             : 4.3.1 

   Ionic Framework               : @ionic/angular 4.0.0-rc.0

   @angular-devkit/build-angular : 0.7.2

   @angular-devkit/schematics    : 0.7.2

   @angular/cli                  : 6.1.1

   @ionic/angular-toolkit        : 1.2.0



Cordova:



   cordova (Cordova CLI) : 8.1.2 (cordova-lib@8.1.1)

   Cordova Platforms     : android 7.0.0, ios 4.5.5

   Cordova Plugins       : cordova-plugin-ionic-keyboard 2.1.3, cordova-plugin-ionic-webview 2.3.1, (and 15 other plugins)



System:



   Android SDK Tools : 26.1.1 

   NodeJS            : v10.4.1 

   npm               : 6.1.0

   OS                : Windows 10

angular ionic-framework ionic-native

share|improve this question

asked Jan 1 at 14:26

umair yasinumair yasin

841113

add a comment | 

0

I am using ionic platform backbutton to over ride the hardware back button functionality. Its working fine to load the previous page but its calling the callback method of backbutton subscribeWithPriority twice. So if i display the pop up in callback method, that pop up is displaying twice which is very annoying. Below is the code i have added in constructor of my app module.

I am only using this back button subscription at one place in my app and that is the main app module as i wanted to show the exit popup msg to user when back button is pressed.

Below is the code for back button subscription:

this.backBtnSubscriber = this.platform.backButton

    .subscribeWithPriority(9999,

      () => {

        this.alertDialogService.presentAlert();

      });

Details about my ionic version are below:

Ionic:



   ionic (Ionic CLI)             : 4.3.1 

   Ionic Framework               : @ionic/angular 4.0.0-rc.0

   @angular-devkit/build-angular : 0.7.2

   @angular-devkit/schematics    : 0.7.2

   @angular/cli                  : 6.1.1

   @ionic/angular-toolkit        : 1.2.0



Cordova:



   cordova (Cordova CLI) : 8.1.2 (cordova-lib@8.1.1)

   Cordova Platforms     : android 7.0.0, ios 4.5.5

   Cordova Plugins       : cordova-plugin-ionic-keyboard 2.1.3, cordova-plugin-ionic-webview 2.3.1, (and 15 other plugins)



System:



   Android SDK Tools : 26.1.1 

   NodeJS            : v10.4.1 

   npm               : 6.1.0

   OS                : Windows 10

angular ionic-framework ionic-native

share|improve this question

asked Jan 1 at 14:26

umair yasinumair yasin

841113

add a comment | 

0

0

0

I am using ionic platform backbutton to over ride the hardware back button functionality. Its working fine to load the previous page but its calling the callback method of backbutton subscribeWithPriority twice. So if i display the pop up in callback method, that pop up is displaying twice which is very annoying. Below is the code i have added in constructor of my app module.

I am only using this back button subscription at one place in my app and that is the main app module as i wanted to show the exit popup msg to user when back button is pressed.

Below is the code for back button subscription:

this.backBtnSubscriber = this.platform.backButton

    .subscribeWithPriority(9999,

      () => {

        this.alertDialogService.presentAlert();

      });

Details about my ionic version are below:

Ionic:



   ionic (Ionic CLI)             : 4.3.1 

   Ionic Framework               : @ionic/angular 4.0.0-rc.0

   @angular-devkit/build-angular : 0.7.2

   @angular-devkit/schematics    : 0.7.2

   @angular/cli                  : 6.1.1

   @ionic/angular-toolkit        : 1.2.0



Cordova:



   cordova (Cordova CLI) : 8.1.2 (cordova-lib@8.1.1)

   Cordova Platforms     : android 7.0.0, ios 4.5.5

   Cordova Plugins       : cordova-plugin-ionic-keyboard 2.1.3, cordova-plugin-ionic-webview 2.3.1, (and 15 other plugins)



System:



   Android SDK Tools : 26.1.1 

   NodeJS            : v10.4.1 

   npm               : 6.1.0

   OS                : Windows 10

angular ionic-framework ionic-native

share|improve this question

asked Jan 1 at 14:26

umair yasinumair yasin

841113

I am using ionic platform backbutton to over ride the hardware back button functionality. Its working fine to load the previous page but its calling the callback method of backbutton subscribeWithPriority twice. So if i display the pop up in callback method, that pop up is displaying twice which is very annoying. Below is the code i have added in constructor of my app module.

I am only using this back button subscription at one place in my app and that is the main app module as i wanted to show the exit popup msg to user when back button is pressed.

Below is the code for back button subscription:

this.backBtnSubscriber = this.platform.backButton

    .subscribeWithPriority(9999,

      () => {

        this.alertDialogService.presentAlert();

      });

Details about my ionic version are below:

Ionic:



   ionic (Ionic CLI)             : 4.3.1 

   Ionic Framework               : @ionic/angular 4.0.0-rc.0

   @angular-devkit/build-angular : 0.7.2

   @angular-devkit/schematics    : 0.7.2

   @angular/cli                  : 6.1.1

   @ionic/angular-toolkit        : 1.2.0



Cordova:



   cordova (Cordova CLI) : 8.1.2 (cordova-lib@8.1.1)

   Cordova Platforms     : android 7.0.0, ios 4.5.5

   Cordova Plugins       : cordova-plugin-ionic-keyboard 2.1.3, cordova-plugin-ionic-webview 2.3.1, (and 15 other plugins)



System:



   Android SDK Tools : 26.1.1 

   NodeJS            : v10.4.1 

   npm               : 6.1.0

   OS                : Windows 10

angular ionic-framework ionic-native

angular ionic-framework ionic-native

share|improve this question

asked Jan 1 at 14:26

umair yasinumair yasin

841113

share|improve this question

asked Jan 1 at 14:26

umair yasinumair yasin

841113

share|improve this question

share|improve this question

asked Jan 1 at 14:26

umair yasinumair yasin

841113

asked Jan 1 at 14:26

umair yasinumair yasin

841113

asked Jan 1 at 14:26

umair yasinumair yasin

841113

841113

add a comment | 

add a comment | 

0

active

oldest

votes

Your Answer

StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");

StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});

function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});


}
});

Thanks for contributing an answer to Stack Overflow!

• Please be sure to answer the question. Provide details and share your research!

But avoid …

• Asking for help, clarification, or responding to other answers.


• Making statements based on opinion; back them up with references or personal experience.

To learn more, see our tips on writing great answers.

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Sign up using Google

Sign up using Facebook

Sign up using Email and Password

Post as a guest

Name

Email

Required, but never shown

StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53996255%2fionic-4-back-button-callback-method-executing-twice%23new-answer', 'question_page');
}
);

Post as a guest

Name

Email

Required, but never shown

0

active

oldest

votes

0

active

oldest

votes

active

oldest

votes

active

oldest

votes

Thanks for contributing an answer to Stack Overflow!

• Please be sure to answer the question. Provide details and share your research!

But avoid …

• Asking for help, clarification, or responding to other answers.


• Making statements based on opinion; back them up with references or personal experience.

To learn more, see our tips on writing great answers.

draft saved

draft discarded

Thanks for contributing an answer to Stack Overflow!

• Please be sure to answer the question. Provide details and share your research!

But avoid …

• Asking for help, clarification, or responding to other answers.


• Making statements based on opinion; back them up with references or personal experience.

To learn more, see our tips on writing great answers.

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Sign up using Google

Sign up using Facebook

Sign up using Email and Password

Post as a guest

Name

Email

Required, but never shown

StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53996255%2fionic-4-back-button-callback-method-executing-twice%23new-answer', 'question_page');
}
);

Post as a guest

Name

Email

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Sign up using Google

Sign up using Facebook

Sign up using Email and Password

Post as a guest

Name

Email

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Sign up using Google

Sign up using Facebook

Sign up using Email and Password

Post as a guest

Name

Email

Required, but never shown

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Sign up using Google

Sign up using Facebook

Sign up using Email and Password

Sign up using Google

Sign up using Facebook

Sign up using Email and Password

Post as a guest

Name

Email

Required, but never shown

Name

Name

Email

Required, but never shown

Email

Required, but never shown

Email

Required, but never shown

Email

Required, but never shown

Name

Name

Email

Required, but never shown

Email

Required, but never shown

Email

Required, but never shown

Email

Required, but never shown

This page is only for reference, If you need detailed information, please check here