Podcast
Questions and Answers
Which of the following components is best suited for accepting keyboard input from a user in a mobile app?
Which of the following components is best suited for accepting keyboard input from a user in a mobile app?
- ListPicker
- TextBox (correct)
- Label
- Button
In the TextBox component, if the Enabled property is unchecked, what is the primary consequence?
In the TextBox component, if the Enabled property is unchecked, what is the primary consequence?
- The text in the box will be bold.
- The user cannot enter input, and it functions like a Label. (correct)
- The user can only enter numbers.
- The text in the box will be hidden.
Which TextBox property allows a developer to display a grayed-out suggestion to the user about what to type?
Which TextBox property allows a developer to display a grayed-out suggestion to the user about what to type?
- BackgroundColor
- FontTypeface
- Text
- Hint (correct)
What is the main function of a 'Random Integer' block in App Inventor?
What is the main function of a 'Random Integer' block in App Inventor?
Which type of application would most benefit from the use of random numbers?
Which type of application would most benefit from the use of random numbers?
The 'Random Fraction' block generates a number within what range?
The 'Random Fraction' block generates a number within what range?
Which of the following is the primary purpose of the 'random set seed' function?
Which of the following is the primary purpose of the 'random set seed' function?
What is the function of the ListPicker component?
What is the function of the ListPicker component?
Which property of the ListPicker component is used to specify the items that appear in the list?
Which property of the ListPicker component is used to specify the items that appear in the list?
After a user makes a selection in a ListPicker, where is the selected item stored?
After a user makes a selection in a ListPicker, where is the selected item stored?
What is the name of the event that is triggered when a user selects an item from the ListPicker?
What is the name of the event that is triggered when a user selects an item from the ListPicker?
In the context of a mobile app, what does a CheckBox component primarily provide?
In the context of a mobile app, what does a CheckBox component primarily provide?
Considering a pizza ordering app, which UI component is most appropriate for allowing users to select multiple toppings?
Considering a pizza ordering app, which UI component is most appropriate for allowing users to select multiple toppings?
What type of block is most useful for triggering specific actions after the state of a checkbox has changed?
What type of block is most useful for triggering specific actions after the state of a checkbox has changed?
Which component is designed to display text that the user cannot directly edit?
Which component is designed to display text that the user cannot directly edit?
What function does the 'TextAlignment' property serve in a TextBox component?
What function does the 'TextAlignment' property serve in a TextBox component?
If you want to create a quiz app with multiple-choice questions, which component would be most suitable for displaying the potential answers?
If you want to create a quiz app with multiple-choice questions, which component would be most suitable for displaying the potential answers?
In App Inventor’s design view, different components can be toggled as visible or hidden. Which property is responsible for this function?
In App Inventor’s design view, different components can be toggled as visible or hidden. Which property is responsible for this function?
What is the primary characteristic of a 'random number' generated by the random integer block?
What is the primary characteristic of a 'random number' generated by the random integer block?
What user interface component is generally preferred for presenting users with a fixed set of options from which they must choose only one?
What user interface component is generally preferred for presenting users with a fixed set of options from which they must choose only one?
Which property of a ListPicker should be modified to display a dropdown of countries such as 'USA', 'Canada', and 'Mexico'?
Which property of a ListPicker should be modified to display a dropdown of countries such as 'USA', 'Canada', and 'Mexico'?
If an app requires users to enter their phone number, which TextBox property would be most appropriate to restrict user input to numbers only?
If an app requires users to enter their phone number, which TextBox property would be most appropriate to restrict user input to numbers only?
Which component allows users to toggle a setting on or off and is ideal for options like 'Enable Notifications'?
Which component allows users to toggle a setting on or off and is ideal for options like 'Enable Notifications'?
How can developers prevent a TextBox from being modified while still displaying its content?
How can developers prevent a TextBox from being modified while still displaying its content?
What is the purpose of the random set seed function in the context of random number generation?
What is the purpose of the random set seed function in the context of random number generation?
In a ListPicker setup, once an item is selected, which event handler is typically used to execute subsequent actions based on the selected choice?
In a ListPicker setup, once an item is selected, which event handler is typically used to execute subsequent actions based on the selected choice?
In the context of checkboxes, which event is triggered immediately a checkbox's state has changed?
In the context of checkboxes, which event is triggered immediately a checkbox's state has changed?
Which property allows setting multiple lines of text in a TextBox?
Which property allows setting multiple lines of text in a TextBox?
In ElementsFromString, what separates the elements?
In ElementsFromString, what separates the elements?
What applications are the random integer block useful for?
What applications are the random integer block useful for?
For which of these applications can you NOT easily use a TextBox?
For which of these applications can you NOT easily use a TextBox?
What data is retrieved from the TextBoxName component when a user clicks the ButtonReadInput component?
What data is retrieved from the TextBoxName component when a user clicks the ButtonReadInput component?
What initially displays nothing but gets populated based on user actions/clicks?
What initially displays nothing but gets populated based on user actions/clicks?
What is the name of an example project discussed?
What is the name of an example project discussed?
Can the TextAlignment property also be used programmatically, using blocks?
Can the TextAlignment property also be used programmatically, using blocks?
Is it only useful to make a set seed at the beginning of a program?
Is it only useful to make a set seed at the beginning of a program?
Which component is used in the random number demo project along with a button?
Which component is used in the random number demo project along with a button?
What is the name of an example 'select a city' project?
What is the name of an example 'select a city' project?
What can the height of the textbox be set to?
What can the height of the textbox be set to?
When using 'ElementsFromString' to make a list, is it necessary to have the same number of characters as other elements?
When using 'ElementsFromString' to make a list, is it necessary to have the same number of characters as other elements?
Once something is copied to the Selection property, is the property updated if the element changes?
Once something is copied to the Selection property, is the property updated if the element changes?
What is the default value for text alignment?
What is the default value for text alignment?
Which functions are useful for game development?
Which functions are useful for game development?
What is the name of the event handler for the ListPicker fruit?
What is the name of the event handler for the ListPicker fruit?
What do random numbers help introduce into an app?
What do random numbers help introduce into an app?
Which of these apps is an example 'hands on' project?
Which of these apps is an example 'hands on' project?
How do you trigger code if the state of a checkbox changes?
How do you trigger code if the state of a checkbox changes?
Flashcards
What is a TextBox component?
What is a TextBox component?
A rectangular area that can display text and accept keyboard input.
TextBox component appearance
TextBox component appearance
A component that appears as a rectangular area on the app's screen allowing users to enter text.
TextBox 'Enabled' property
TextBox 'Enabled' property
This property allows users to enter input. If unchecked, the TextBox displays text like a Label.
TextBox 'TextColor' property
TextBox 'TextColor' property
Signup and view all the flashcards
TextBox 'TextAlignment'
TextBox 'TextAlignment'
Signup and view all the flashcards
TextBox 'Hint' property
TextBox 'Hint' property
Signup and view all the flashcards
Random Integer Block
Random Integer Block
Signup and view all the flashcards
Random Fraction Block
Random Fraction Block
Signup and view all the flashcards
Random Set Seed Function
Random Set Seed Function
Signup and view all the flashcards
What is a ListPicker component?
What is a ListPicker component?
Signup and view all the flashcards
ListPicker's 'ElementsFromString'
ListPicker's 'ElementsFromString'
Signup and view all the flashcards
ListPicker Selection Property
ListPicker Selection Property
Signup and view all the flashcards
What is the AfterPicking event?
What is the AfterPicking event?
Signup and view all the flashcards
What is a CheckBox component?
What is a CheckBox component?
Signup and view all the flashcards
Randomisation
Randomisation
Signup and view all the flashcards
Study Notes
TextBox Component Basics
- The TextBox component is a rectangular area that can display text
- The TextBox component can also accept keyboard input
- Many programs require the user to enter data via a TextBox
- The data entered by the user is then utilizes in some operation
TextBox Demo Walkthrough
- TableArrangement1 is a table arrangement component with 1 row and 2 columns
- LabelEnterYourName is a label component that displays the text: "Enter your name:"
- TextBoxName is a TextBox component where the user can enter a his / her name
- ButtonReadInput is a button component that, when clicked, reads the input from the TextBoxName
- The button displays the read input in the LabelOutput component
- TableArrangement2 is a table arrangement with 1 row and 2 columns
- LabelYouEntered is a label that displays the text: "You entered:"
- LabelOutput is a label component that displays nothing initially
- Once the user clicks the ButtonReadInput, the entry from TextBoxName is displayed in LabelOutput
TextBox Properties
- BackgroundColor sets the TextBox's background color
- Enabled determines if the user can enter input; can be set to use a Label to display text if disabled
- FontBold, FontItalic and FontSize will change how font is displayed
- Hint displays a hint; clear property to not display
- MultiLine determines if the TextBox accepts multiple lines
- NumbersOnly dictates whether the TextBox accepts only numerical inputs
- TextAlignment specifies text alignment inside the TextBox using left, center, or right
- TextColor sets the color of text displayed in the TextBox
- Visible specifies whether the component is hidden or visible
- Width and Height determine component dimensions
Random Numbers
- Used in a variety of apps
- App Inventor has math blocks to generate random numbers
- Random numbers play a crucial role in Statistics; for randomly selecting data for analysis
- Random numbers play a crucial role in Computer Security for encrypting sensitive data
- Random numbers play a crucial role in Games by; Simulating dice rolls; drawing cards from shuffled deck
- Random numbers play a crucial role in Simulations by; Determining behaviors, creating unpredictable events
- Functionality requires two arguments: from and to, and returns a random integer between the specified range
- App Inventor automatically sets the range from 1 to 100 by default; the values can be modified
Random Fraction
- The random fraction block is a function that returns a random fractional number between 0 and 1.
- The random set seed function lets you specify a seed value for random number generation.
- Using this function is helpful for testing purposes. Call this function at the beginning of a program, to generate the same sequence of random numbers
ListPicker Component
- ListPicker displays a list of items; the user can select single item from the displayed list.
- ElementsFromString is a key property to create a list: i.e., Apples, Bananas, Pears
- Items are separated by commas; useful for dropdown selections
- Selection property: when the user selects item, the selected item is copied into the Selection property
- AfterPicking event handler can be used to trigger a subsequent event
- A Time Zone App example was shown
Checkbox Component
- CheckBox component appears as a small checkable box with accompanying text.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
An overview ot the TextBox UI component. This component allows the user to enter text. It also displays the entered text using the LabelOutput UI component.
