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Thread: Android back button click showing blank page.

  1. #1
    Sencha User
    Join Date
    Aug 2012
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    Default Unanswered: Android back button click showing blank page.

    I am new to sencha. Almost spent 2 day to understand sencha routing/history support to implement android back button. but ended up with blank screen always although navigation is working. Please help me to find out what wrong am i doing or what is wrong with my application architecture.

    app.js
    Code:
    Ext.application({
        name: "WorkFlow",
       
        models: [],
        stores: [],
        controllers: ["WFController"],
        views: ["LoginForm","WorkList"],
    
        launch: function () {
    
             var loginForm = {
                 xtype: "loginform"
             }; 
             
             var workList = {
                     xtype: "worklist"
             };
            
            Ext.Viewport.add([loginForm,workList]);
            
        // set up a listener to handle the back button for Android 
            if (Ext.os.is('Android')) {
                
              document.addEventListener("backbutton", Ext.bind(onBackKeyDown, this), false);  
    
              function onBackKeyDown(e) {
                  
                  e.preventDefault();
                 
                  // you are at the home screen
                  if (Ext.Viewport.getActiveItem().xtype == loginForm.xtype ) {
                   
                  navigator.app.exitApp();
                  }else {
                    
                          this.getApplication().getHistory().add(Ext.create('Ext.app.Action', {
                          url: 'loginForm'
                      }));
                  }
              }
           }
            
        }
    });
    LoginForm.js
    Code:
    var formPanel = null;
    
    Ext.define("WorkFlow.view.LoginForm", {
        extend: "Ext.form.Panel",
        alias: "widget.loginform",
       
        initialize: function () {
    
         this.callParent(arguments);
    
         formPanel = Ext.create('Ext.form.Panel', {
                fullscreen: true,
    
                  items: [{
                            xtype: 'titlebar',
                            title: 'Login',
                            docked: 'top'
                        },
                        {
                        xtype: 'fieldset',
                        items: [
                        {
                            xtype: 'textfield',
                            name : 'username',
                            label: 'Username',
                        },
                        {
                            xtype: 'passwordfield',
                            name : 'password',
                            label: 'Password',
                        },
                        {
                            xtype: 'textfield',
                            name : 'deviceId',
                            label: 'Device Id',
                        }
                    ]
                }]
            });
    
           formPanel.add({
                xtype: 'toolbar',
                docked: 'bottom',
                layout: { pack: 'center' },
                items: [
                    {
                        xtype: 'button',
                        text: 'Login',
                        handler: this.onLoginTap,
                        scope: this
                    },
                    {
                        xtype: 'button',
                        text: 'Cancel',
                        handler: function() {
                            formPanel.reset();
                        }
                    }
                ]
            });
    
        },
        
        onLoginTap: function() {
            this.fireEvent("loginCommand", this);
        },
    
    });
    WorkList.js
    Code:
    Ext.define("WorkFlow.view.WorkList", {
        extend: "Ext.form.Panel",
        alias: "widget.worklist",
       config:{
       html: 'This is worklist...',
       
       } 
    });
    WFController.js
    Code:
    Ext.define("WorkFlow.controller.WFController", {
        extend: "Ext.app.Controller",
    
         config: {
              refs: {
                   
                loginForm: "loginform",
                workList: "worklist",
            },
            control: {
                loginForm: {
                    loginCommand: "onLoginCommand",
                }
            },
            routes: {
                'loginForm': 'activateLoginFormPage'
            }
        },
        activateLoginFormPage: function(){
                Ext.Viewport.animateActiveItem(this.getLoginForm(), this.slideRightTransition);    
        },
    
         slideLeftTransition: { type: 'slide', direction: 'left' },
        slideRightTransition: { type: 'slide', direction: 'right' },
       
       onLoginCommand: function () {
    
          var values = formPanel.getValues();
         window.plugins.AuthPlugin.authenticate(values.username,values.passwordvalues.deviceId,values,
          function loginCallBack(result){
    
               if(result=="PASSWORD_MATCH"){
                            
                loginForm.onLoginSuccess();
               }
            });
        },
    
         onLoginSuccess: function(){
        
        this.getApplication().getHistory().add(Ext.create('Ext.app.Action', {
        url: 'loginFormroute/workList'
        }));
     
           Ext.Viewport.animateActiveItem(this.getWorkList(), this.slideRightTransition);     
        },
        
        launch: function () {
        },
        init: function () {
        }
    });

  2. #2
    Sencha - Sr Software Engineer mitchellsimoens's Avatar
    Join Date
    Mar 2007
    Location
    Gainesville, FL
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    Default

    When you go back, is it trying to go to the URL that has no hash in it? Like when you first start your app there is no hash so if you go forward there is one and go back it will have no hash.

    Do you understand what the fullscreen config actually does?
    Mitchell Simoens @LikelyMitch
    Sencha Inc, Senior Software Engineer
    ________________
    Learn BBCode and use it!

    Check out my GitHub, lots of nice things for Ext JS 4 and Sencha Touch 2
    https://github.com/mitchellsimoens

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