Hi 

I was try mobile back button to logout the screen. I used this java script 

Steps to follow:

1) Include the dialogs plugin as the Extensibility Configurations property value for the application module as shown below (Or define the dialogs plugin as an isolated application module)

{    "plugin":     {        "url": "https://github.com/apache/cordova-plugin-dialogs.git"    }}

2) Under the Logic Tab, introduce OnApplicationReady Systems event

3) Within the OnApplicationReady action flow, introduce a JS node with the below script

JS Snippet:

function goToPreviousScreen(button) {

  if (button == 1) {

      history.back(); // go to previous screen, if presses "Yes"

  } else {

    return false; // No action, if presses "cancel"

  }

}

function onBackButtonClick() {

  document.addEventListener(

    "backbutton",

    function (e) {

      navigator.notification.confirm(

        "Are you sure you want to leave the screen?",

        goToPreviousScreen,

        "Warning",

        "Yes, Cancel"

      ); // you can change the button names in the place of Yes, Cancel.

    },

    false

  );

}

if ($actions.CheckDialogsPlugin()) {

  onBackButtonClick();

}

but As I want to logout the page but this code used for previous page. have any solution for my problem. I was attach my OML file also