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Thread: How to trigger NavigationView.pop() from onKeyUp listener

  1. #1
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    Default Answered: How to trigger NavigationView.pop() from onKeyUp listener

    I am trying to listen for a "keyup" event at any time and on any screen of my app. If such an event occurs, I want my NavigationView to pop() -- the same thing that would happen if the user were to tap the Back button.

    In my controller "launch" function I have the following code. How can I get a reference to the NavigationView so I can call pop()? this.getMainNav() works in my other controllers for List itemtaps.
    Code:
    document.addEventListener("keyup", onKeyUp, false);
    function onKeyUp() {
        console.log('back');
        this.getMainNav().pop(); // doesn't work
    }
    Console error:
    Uncaught TypeError: Object function () {
    return this.constructor.apply(this, arguments);
    } has no method 'pop'

  2. That error is saying you have a scoping issue.

    Code:
        launch: function() {
            var me = this;
    
            Ext.Viewport.add({
                xclass: 'MyApp.view.MainNav'
            });
    
    
            // listen for back button
            document.addEventListener("backbutton", onBackKeyDown, true);
    
    
            // for testing purposes in browser
            document.addEventListener("click", onBackKeyDown, true);
    
    
            function onBackKeyDown() {
                console.log(me.getMainNav());
            }
        }

  3. #2
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    Default

    I am still having this issue, has anyone dealt with this before?

  4. #3
    Sencha - Sr Software Engineer mitchellsimoens's Avatar
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    Default

    Look to see what getMainNav() returns. Is there a reference already created to match your ref?
    Mitchell Simoens @LikelyMitch
    Sencha Inc, Senior Software Engineer
    ________________
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    Check out my GitHub, lots of nice things for Ext JS 4 and Sencha Touch 2
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  5. #4
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    Default

    My "ref" and "selector" in the controller reference are both mainNav, as well as my userAlias and userClassName for the NavigationView (userClassName is MainNav with capital M). Do you mean I have to create another reference other than the controller?

    I'm also not sure what I changed, but the error is different now.

    The following code:
    Code:
    Ext.define('MyApp.controller.MyController', {
        extend: 'Ext.app.Controller',
    
    
        config: {
            refs: {
                mainNav: 'mainNav'
            },
    
    
        launch: function() {
            Ext.Viewport.add({
                xclass: 'MyApp.view.MainNav'
            });
    
    
            // listen for back button
            document.addEventListener("backbutton", onBackKeyDown, true);
    
    
            // for testing purposes in browser
            document.addEventListener("click", onBackKeyDown, true);
    
    
            function onBackKeyDown() {
                console.log(this.getMainNav());
            }
        }
    });
    Logs:
    Uncaught TypeError: Object #<HTMLDocument> has no method 'getMainNav'

  6. #5
    Sencha - Sr Software Engineer mitchellsimoens's Avatar
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      1  

    Default

    That error is saying you have a scoping issue.

    Code:
        launch: function() {
            var me = this;
    
            Ext.Viewport.add({
                xclass: 'MyApp.view.MainNav'
            });
    
    
            // listen for back button
            document.addEventListener("backbutton", onBackKeyDown, true);
    
    
            // for testing purposes in browser
            document.addEventListener("click", onBackKeyDown, true);
    
    
            function onBackKeyDown() {
                console.log(me.getMainNav());
            }
        }
    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

    Think my support is good? Get more personalized support via a support subscription. https://www.sencha.com/store/

    Need more help with your app? Hire Sencha Services services@sencha.com

    Want to learn Sencha Touch 2? Check out Sencha Touch in Action that is in print!

    When posting code, please use BBCode's CODE tags.

  7. #6
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    Default

    So that's what that does! This solves so many of my issues. You've saved me yet again, thank you.

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