The process of customizing a tabbed interface in Titanium and integrating SQLite data

Question

The process of customizing a tabbed interface in Titanium and integrating SQLite data

The Situation

As a Titanium beginner, I recently decided to explore SQLite functionality and incorporate new UI features into my app. I chose the TabGroup for ease of use, but I've encountered some issues along the way. My goal is straightforward - retrieve quotes from a table (which I verified is working) and display them in the wiseWords tab for user viewing.

The Implementation

index.xml

<Alloy id="index">
    <TabGroup>
        <Require src="home"></Require>
        <Require src="wiseWords"></Require>
        <Require src="settings"></Require>
    </TabGroup>
</Alloy>

index.js

$.index.open(); 

/** Create and populate the wise words table. **/
Alloy.Globals.createRequiredTables();

var selectWiseWordsSQL = "SELECT * FROM wise_words";
var selectWiseWords = Titanium.App.db.execute(selectWiseWordsSQL);

while (selectWiseWords.isValidRow()) {
    /** Create labels for each quote. **/
    var addQuote = Titanium.UI.createLabel({
        text : selectWiseWords.fieldByName("saying") + " - " + selectWiseWords.fieldByName("quoted_by"),
    });

    /** Add quote to window (available in wiseWords.xml). **/
    $.wiseWordsWindow.add(addQuote);

    selectWiseWords.next();
}
selectWiseWords.close();

wiseWords.xml

<Alloy>
    <Tab id="wiseWordsTab" title="Wise Words">
        <Window id="wiseWordsWindow" class="container" title="Wise Words">  
        </Window>
    </Tab>
</Alloy>

The Issue(s)

Runetime Error

Location: alloy/controllers/index.js

Uncaught TypeError: Cannot call method 'add' of undefined.

Source: $.wiseWordsWindow.add(addQuote);

To Clarify...

I comprehend the error message, but am puzzled as to why it's appearing.

Why am I unable to access the view for wiseWords.xml in index.js despite wiseWords being referenced in index.xml using the <Require> tag?

javascript android xml sqlite titanium

Answer 1

Answer №1

Explanation

The current issue lies in the method call of add for the window with id wiseWordsWindow. Your code indicates that you are utilizing this controller in your index.xml file through the use of require, which restricts direct access to the elements of the wiseWords controller. To address this, consider creating a method in the wiseWords controller that can be accessed from the index file and subsequently add children to the wiseWordsWindow. There are two recommended approaches to rectifying this.

Method 1

The Code

index.xml (be sure to assign an id to wiseWords in this file)

<Alloy id="index">
    <TabGroup>
        <Require src="home"></Require>
        <Require id="wiseWordsWin" src="wiseWords"></Require>
        <Require src="settings"></Require>
    </TabGroup>
</Alloy>

index.js (amend the method call from add to the method being created in our wiseWords controller within this file)

replace line $.wiseWordsWindow.add(addQuote); with the following.

$.wiseWordsWin.addQuote(addQuote);

updated code for index.js

/** Establish and populate the wise words table. **/
Alloy.Globals.createRequiredTables();

var selectWiseWordsSQL = "SELECT * FROM wise_words";
var selectWiseWords = Titanium.App.db.execute(selectWiseWordsSQL);

while (selectWiseWords.isValidRow()) {
    /** Generate labels for each quote. **/
    var addQuote = Titanium.UI.createLabel({
        text : selectWiseWords.fieldByName("saying") + " - " + selectWiseWords.fieldByName("quoted_by"),
    });

    /** Append quote to window (found in wiseWords.xml). **/
    $.wiseWordsWin.addQuote(addQuote);

    selectWiseWords.next();
}
selectWiseWords.close();
$.index.open();

wiseWords (leave this file unchanged)

wiseWords.js (include the addQuote method in this controller and assign it to our controller)

function addQuote(_quote){
    $.wiseWordsWindow.add(_quote);
}
exports.addQuote = addQuote;

Method 2

This alternative involves maintaining the same code as in Method 1 for index.xml. The modifications will occur in index.js and wiseWords.js.

The Code

wiseWords.js (integrate the following lines into this file)

exports.myWiseWordsWin = $.wiseWordsWindow;

index.js (now we can access our wiseWordsWindow from the index file using the specified reference for our window)

replace line $.wiseWordsWindow.add(addQuote); with the following.

$.wiseWordsWin.myWiseWordsWin.add(addQuote);

updated code for index.js

/** Establish and populate the wise words table. **/
Alloy.Globals.createRequiredTables();

var selectWiseWordsSQL = "SELECT * FROM wise_words";
var selectWiseWords = Titanium.App.db.execute(selectWiseWordsSQL);

while (selectWiseWords.isValidRow()) {
    /** Generate labels for each quote. **/
    var addQuote = Titanium.UI.createLabel({
        text : selectWiseWords.fieldByName("saying") + " - " + selectWiseWords.fieldByName("quoted_by"),
    });

    /** Append quote to window (found in wiseWords.xml). **/
    $.wiseWordsWin.myWiseWordsWin.add(addQuote);
    selectWiseWords.next();
}
selectWiseWords.close();
$.index.open();

We trust that these solutions will prove beneficial.

Answer 2

Explanation

The current issue lies in the method call of add for the window with id wiseWordsWindow. Your code indicates that you are utilizing this controller in your index.xml file through the use of require, which restricts direct access to the elements of the wiseWords controller. To address this, consider creating a method in the wiseWords controller that can be accessed from the index file and subsequently add children to the wiseWordsWindow. There are two recommended approaches to rectifying this.

Method 1

The Code

index.xml (be sure to assign an id to wiseWords in this file)

<Alloy id="index">
    <TabGroup>
        <Require src="home"></Require>
        <Require id="wiseWordsWin" src="wiseWords"></Require>
        <Require src="settings"></Require>
    </TabGroup>
</Alloy>

index.js (amend the method call from add to the method being created in our wiseWords controller within this file)

replace line $.wiseWordsWindow.add(addQuote); with the following.

$.wiseWordsWin.addQuote(addQuote);

updated code for index.js

/** Establish and populate the wise words table. **/
Alloy.Globals.createRequiredTables();

var selectWiseWordsSQL = "SELECT * FROM wise_words";
var selectWiseWords = Titanium.App.db.execute(selectWiseWordsSQL);

while (selectWiseWords.isValidRow()) {
    /** Generate labels for each quote. **/
    var addQuote = Titanium.UI.createLabel({
        text : selectWiseWords.fieldByName("saying") + " - " + selectWiseWords.fieldByName("quoted_by"),
    });

    /** Append quote to window (found in wiseWords.xml). **/
    $.wiseWordsWin.addQuote(addQuote);

    selectWiseWords.next();
}
selectWiseWords.close();
$.index.open();

wiseWords (leave this file unchanged)

wiseWords.js (include the addQuote method in this controller and assign it to our controller)

function addQuote(_quote){
    $.wiseWordsWindow.add(_quote);
}
exports.addQuote = addQuote;

Method 2

This alternative involves maintaining the same code as in Method 1 for index.xml. The modifications will occur in index.js and wiseWords.js.

The Code

wiseWords.js (integrate the following lines into this file)

exports.myWiseWordsWin = $.wiseWordsWindow;

index.js (now we can access our wiseWordsWindow from the index file using the specified reference for our window)

replace line $.wiseWordsWindow.add(addQuote); with the following.

$.wiseWordsWin.myWiseWordsWin.add(addQuote);

updated code for index.js

/** Establish and populate the wise words table. **/
Alloy.Globals.createRequiredTables();

var selectWiseWordsSQL = "SELECT * FROM wise_words";
var selectWiseWords = Titanium.App.db.execute(selectWiseWordsSQL);

while (selectWiseWords.isValidRow()) {
    /** Generate labels for each quote. **/
    var addQuote = Titanium.UI.createLabel({
        text : selectWiseWords.fieldByName("saying") + " - " + selectWiseWords.fieldByName("quoted_by"),
    });

    /** Append quote to window (found in wiseWords.xml). **/
    $.wiseWordsWin.myWiseWordsWin.add(addQuote);
    selectWiseWords.next();
}
selectWiseWords.close();
$.index.open();

We trust that these solutions will prove beneficial.

The process of customizing a tabbed interface in Titanium and integrating SQLite data

Answer №1

Method 1

Method 2

Similar questions

What is the correct way to access data from an array list when performing the initial operation?

The p5js function pixelDensity() does not provide improved resolution on retina screens

The mouse movement event will not be triggered for every frame when a keyboard event occurs

React Full Calendar Error: Unable to access property 'calendar' from undefined

Shadowing jQuery variables involves declaring a new variable with the

Steer clear of 405 errors by implementing AJAX in combination with Flask and JINJA templ

Display all images in a dynamic jQuery gallery popup

"Mesmerizing Motion: The World of Three

Make sure to include the onBlur and sx props when passing them through the slotsProp of the MUI DatePicker

The dropdown feature in Safari fails to collapse when an option is selected

I am seeking a solution to this error that occurs whenever I attempt to call a function using a button

Adding a class to the body depending on the tag or href that was clicked on the previous page

Error message: Next.js - Unable to access properties of an undefined object (user)

Construct a structure containing the key/value pairs of cells within an HTML table row using JavaScript

The parameter did not successfully transfer to the internal function within Firebase Cloud Functions

Ensuring Consistent Height for Bootstrap Card Headers

Deploying a static website using Node.JS without relying on any frameworks

Refreshing a component within a React application

"Encountering a challenge when trying to fetch the value of an undefined or null

Implementing Avro file deserialization in a React application