###BeginCaseStudy###
Case Study: 1
Scenario 1
Application Information
You are developing two Windows Store apps by using JavaScript: a Personal Trainer app and
a Client app. The apps will allow personal fitness trainers to interact with their remote clients.
Business Requirements- Personal Trainer Application
The Personal Trainer app must allow trainers to perform the following tasks:
• Create and store video and audio recordings of workout routines.
• View the profile and workout recordings for only one client at any time.
Business Requirements- Client Application
The Client app must allow clients to perform the following tasks:
• Browse a list of the trainer’s workout recordings.
• Record workouts by using the built-in webcam.
• Play, pause, restart, and stop workout recordings.
• If the capability is supported, allow the client’s webcam to pan as the client moves
around the room.
• Upload workout recordings for trainer review.
• Update their individual profiles to indicate workouts completed, calories burned, and
current weight.
The Client app must validate that the client’s subscription is valid.
Technical Requirements- General
The Client app must allow clients to perform the following tasks:
• Browse a list of the trainer’s workout recordings.
• Record workouts by using the built-in webcam.
• Play, pause, restart, and stop workout recordings.
• If the capability is supported, allow the client’s webcam to pan as the client moves
around the room.
• Upload workout recordings for trainer review.
• Update their individual profiles to indicate workouts completed, calories burned, and
current weight.
The Client app must validate that the client’s subscription is valid.
Technical Requirements- Hardware Requirements
The Personal Trainer and Client apps must support the following hardware requirements:
• Windows 8
• Webcam, microphone, and speakers
• Internet connection
While testing the apps, you identify the following issues:
• When you start the app for the first time, the system displays this warning message:
“This app needs permission to use your camera, which you can change in the app’s settings.”
• When you run the loadClientProfile( ) method in the clientData.js file, you receive an
“Access Denied” exception.
• The findCamera( ) method in the video.js file throws an exception on some devices.
• The recordVideo( ) method in the video.js file throws an exception when the device
does not support tilting.



###EndCaseStudy###

You need to prevent the exception that is being thrown by the findCamera( ) method.
What should you do?

###BeginCaseStudy###
Case Study: 1
Scenario 1
Application Information
You are developing two Windows Store apps by using JavaScript: a Personal Trainer app and
a Client app. The apps will allow personal fitness trainers to interact with their remote clients.
Business Requirements- Personal Trainer Application
The Personal Trainer app must allow trainers to perform the following tasks:
• Create and store video and audio recordings of workout routines.
• View the profile and workout recordings for only one client at any time.
Business Requirements- Client Application
The Client app must allow clients to perform the following tasks:
• Browse a list of the trainer’s workout recordings.
• Record workouts by using the built-in webcam.
• Play, pause, restart, and stop workout recordings.
• If the capability is supported, allow the client’s webcam to pan as the client moves
around the room.
• Upload workout recordings for trainer review.
• Update their individual profiles to indicate workouts completed, calories burned, and
current weight.
The Client app must validate that the client’s subscription is valid.
Technical Requirements- General
The Client app must allow clients to perform the following tasks:
• Browse a list of the trainer’s workout recordings.
• Record workouts by using the built-in webcam.
• Play, pause, restart, and stop workout recordings.
• If the capability is supported, allow the client’s webcam to pan as the client moves
around the room.
• Upload workout recordings for trainer review.
• Update their individual profiles to indicate workouts completed, calories burned, and
current weight.
The Client app must validate that the client’s subscription is valid.
Technical Requirements- Hardware Requirements
The Personal Trainer and Client apps must support the following hardware requirements:
• Windows 8
• Webcam, microphone, and speakers
• Internet connection
While testing the apps, you identify the following issues:
• When you start the app for the first time, the system displays this warning message:
“This app needs permission to use your camera, which you can change in the app’s settings.”
• When you run the loadClientProfile( ) method in the clientData.js file, you receive an
“Access Denied” exception.
• The findCamera( ) method in the video.js file throws an exception on some devices.
• The recordVideo( ) method in the video.js file throws an exception when the device
does not support tilting.



###EndCaseStudy###

You need to debug the error that is displayed in the warning message.
What should you do?

###BeginCaseStudy###
Case Study: 1
Scenario 1
Application Information
You are developing two Windows Store apps by using JavaScript: a Personal Trainer app and
a Client app. The apps will allow personal fitness trainers to interact with their remote clients.
Business Requirements- Personal Trainer Application
The Personal Trainer app must allow trainers to perform the following tasks:
• Create and store video and audio recordings of workout routines.
• View the profile and workout recordings for only one client at any time.
Business Requirements- Client Application
The Client app must allow clients to perform the following tasks:
• Browse a list of the trainer’s workout recordings.
• Record workouts by using the built-in webcam.
• Play, pause, restart, and stop workout recordings.
• If the capability is supported, allow the client’s webcam to pan as the client moves
around the room.
• Upload workout recordings for trainer review.
• Update their individual profiles to indicate workouts completed, calories burned, and
current weight.
The Client app must validate that the client’s subscription is valid.
Technical Requirements- General
The Client app must allow clients to perform the following tasks:
• Browse a list of the trainer’s workout recordings.
• Record workouts by using the built-in webcam.
• Play, pause, restart, and stop workout recordings.
• If the capability is supported, allow the client’s webcam to pan as the client moves
around the room.
• Upload workout recordings for trainer review.
• Update their individual profiles to indicate workouts completed, calories burned, and
current weight.
The Client app must validate that the client’s subscription is valid.
Technical Requirements- Hardware Requirements
The Personal Trainer and Client apps must support the following hardware requirements:
• Windows 8
• Webcam, microphone, and speakers
• Internet connection
While testing the apps, you identify the following issues:
• When you start the app for the first time, the system displays this warning message:
“This app needs permission to use your camera, which you can change in the app’s settings.”
• When you run the loadClientProfile( ) method in the clientData.js file, you receive an
“Access Denied” exception.
• The findCamera( ) method in the video.js file throws an exception on some devices.
• The recordVideo( ) method in the video.js file throws an exception when the device
does not support tilting.



###EndCaseStudy###

You need to ensure that client profiles can be saved in the required file format.
Which code segment should you insert at line CD21?

###BeginCaseStudy###
Case Study: 1
Scenario 1
Application Information
You are developing two Windows Store apps by using JavaScript: a Personal Trainer app and
a Client app. The apps will allow personal fitness trainers to interact with their remote clients.
Business Requirements- Personal Trainer Application
The Personal Trainer app must allow trainers to perform the following tasks:
• Create and store video and audio recordings of workout routines.
• View the profile and workout recordings for only one client at any time.
Business Requirements- Client Application
The Client app must allow clients to perform the following tasks:
• Browse a list of the trainer’s workout recordings.
• Record workouts by using the built-in webcam.
• Play, pause, restart, and stop workout recordings.
• If the capability is supported, allow the client’s webcam to pan as the client moves
around the room.
• Upload workout recordings for trainer review.
• Update their individual profiles to indicate workouts completed, calories burned, and
current weight.
The Client app must validate that the client’s subscription is valid.
Technical Requirements- General
The Client app must allow clients to perform the following tasks:
• Browse a list of the trainer’s workout recordings.
• Record workouts by using the built-in webcam.
• Play, pause, restart, and stop workout recordings.
• If the capability is supported, allow the client’s webcam to pan as the client moves
around the room.
• Upload workout recordings for trainer review.
• Update their individual profiles to indicate workouts completed, calories burned, and
current weight.
The Client app must validate that the client’s subscription is valid.
Technical Requirements- Hardware Requirements
The Personal Trainer and Client apps must support the following hardware requirements:
• Windows 8
• Webcam, microphone, and speakers
• Internet connection
While testing the apps, you identify the following issues:
• When you start the app for the first time, the system displays this warning message:
“This app needs permission to use your camera, which you can change in the app’s settings.”
• When you run the loadClientProfile( ) method in the clientData.js file, you receive an
“Access Denied” exception.
• The findCamera( ) method in the video.js file throws an exception on some devices.
• The recordVideo( ) method in the video.js file throws an exception when the device
does not support tilting.



###EndCaseStudy###

You need to validate whether the additional video recording functionality for the Client app is
supported.
Which code segment should you insert at line VD05?

###BeginCaseStudy###
Case Study: 1
Scenario 1
Application Information
You are developing two Windows Store apps by using JavaScript: a Personal Trainer app and
a Client app. The apps will allow personal fitness trainers to interact with their remote clients.
Business Requirements- Personal Trainer Application
The Personal Trainer app must allow trainers to perform the following tasks:
• Create and store video and audio recordings of workout routines.
• View the profile and workout recordings for only one client at any time.
Business Requirements- Client Application
The Client app must allow clients to perform the following tasks:
• Browse a list of the trainer’s workout recordings.
• Record workouts by using the built-in webcam.
• Play, pause, restart, and stop workout recordings.
• If the capability is supported, allow the client’s webcam to pan as the client moves
around the room.
• Upload workout recordings for trainer review.
• Update their individual profiles to indicate workouts completed, calories burned, and
current weight.
The Client app must validate that the client’s subscription is valid.
Technical Requirements- General
The Client app must allow clients to perform the following tasks:
• Browse a list of the trainer’s workout recordings.
• Record workouts by using the built-in webcam.
• Play, pause, restart, and stop workout recordings.
• If the capability is supported, allow the client’s webcam to pan as the client moves
around the room.
• Upload workout recordings for trainer review.
• Update their individual profiles to indicate workouts completed, calories burned, and
current weight.
The Client app must validate that the client’s subscription is valid.
Technical Requirements- Hardware Requirements
The Personal Trainer and Client apps must support the following hardware requirements:
• Windows 8
• Webcam, microphone, and speakers
• Internet connection
While testing the apps, you identify the following issues:
• When you start the app for the first time, the system displays this warning message:
“This app needs permission to use your camera, which you can change in the app’s settings.”
• When you run the loadClientProfile( ) method in the clientData.js file, you receive an
“Access Denied” exception.
• The findCamera( ) method in the video.js file throws an exception on some devices.
• The recordVideo( ) method in the video.js file throws an exception when the device
does not support tilting.



###EndCaseStudy###

You need to handle the exception error in the clientData.js file.
What should you do?

###BeginCaseStudy###
Case Study: 1
Scenario 1
Application Information
You are developing two Windows Store apps by using JavaScript: a Personal Trainer app and
a Client app. The apps will allow personal fitness trainers to interact with their remote clients.
Business Requirements- Personal Trainer Application
The Personal Trainer app must allow trainers to perform the following tasks:
• Create and store video and audio recordings of workout routines.
• View the profile and workout recordings for only one client at any time.
Business Requirements- Client Application
The Client app must allow clients to perform the following tasks:
• Browse a list of the trainer’s workout recordings.
• Record workouts by using the built-in webcam.
• Play, pause, restart, and stop workout recordings.
• If the capability is supported, allow the client’s webcam to pan as the client moves
around the room.
• Upload workout recordings for trainer review.
• Update their individual profiles to indicate workouts completed, calories burned, and
current weight.
The Client app must validate that the client’s subscription is valid.
Technical Requirements- General
The Client app must allow clients to perform the following tasks:
• Browse a list of the trainer’s workout recordings.
• Record workouts by using the built-in webcam.
• Play, pause, restart, and stop workout recordings.
• If the capability is supported, allow the client’s webcam to pan as the client moves
around the room.
• Upload workout recordings for trainer review.
• Update their individual profiles to indicate workouts completed, calories burned, and
current weight.
The Client app must validate that the client’s subscription is valid.
Technical Requirements- Hardware Requirements
The Personal Trainer and Client apps must support the following hardware requirements:
• Windows 8
• Webcam, microphone, and speakers
• Internet connection
While testing the apps, you identify the following issues:
• When you start the app for the first time, the system displays this warning message:
“This app needs permission to use your camera, which you can change in the app’s settings.”
• When you run the loadClientProfile( ) method in the clientData.js file, you receive an
“Access Denied” exception.
• The findCamera( ) method in the video.js file throws an exception on some devices.
• The recordVideo( ) method in the video.js file throws an exception when the device
does not support tilting.



###EndCaseStudy###

You need to enable trainers to select client profiles.
Which code segment should you insert at line CD06?

###BeginCaseStudy###
Case Study: 1
Scenario 1
Application Information
You are developing two Windows Store apps by using JavaScript: a Personal Trainer app and
a Client app. The apps will allow personal fitness trainers to interact with their remote clients.
Business Requirements- Personal Trainer Application
The Personal Trainer app must allow trainers to perform the following tasks:
• Create and store video and audio recordings of workout routines.
• View the profile and workout recordings for only one client at any time.
Business Requirements- Client Application
The Client app must allow clients to perform the following tasks:
• Browse a list of the trainer’s workout recordings.
• Record workouts by using the built-in webcam.
• Play, pause, restart, and stop workout recordings.
• If the capability is supported, allow the client’s webcam to pan as the client moves
around the room.
• Upload workout recordings for trainer review.
• Update their individual profiles to indicate workouts completed, calories burned, and
current weight.
The Client app must validate that the client’s subscription is valid.
Technical Requirements- General
The Client app must allow clients to perform the following tasks:
• Browse a list of the trainer’s workout recordings.
• Record workouts by using the built-in webcam.
• Play, pause, restart, and stop workout recordings.
• If the capability is supported, allow the client’s webcam to pan as the client moves
around the room.
• Upload workout recordings for trainer review.
• Update their individual profiles to indicate workouts completed, calories burned, and
current weight.
The Client app must validate that the client’s subscription is valid.
Technical Requirements- Hardware Requirements
The Personal Trainer and Client apps must support the following hardware requirements:
• Windows 8
• Webcam, microphone, and speakers
• Internet connection
While testing the apps, you identify the following issues:
• When you start the app for the first time, the system displays this warning message:
“This app needs permission to use your camera, which you can change in the app’s settings.”
• When you run the loadClientProfile( ) method in the clientData.js file, you receive an
“Access Denied” exception.
• The findCamera( ) method in the video.js file throws an exception on some devices.
• The recordVideo( ) method in the video.js file throws an exception when the device
does not support tilting.



###EndCaseStudy###

You need to prevent the device-specific tilting exception.
What should you do in the video.js file?

###BeginCaseStudy###
Case Study: 1
Scenario 1
Application Information
You are developing two Windows Store apps by using JavaScript: a Personal Trainer app and
a Client app. The apps will allow personal fitness trainers to interact with their remote clients.
Business Requirements- Personal Trainer Application
The Personal Trainer app must allow trainers to perform the following tasks:
• Create and store video and audio recordings of workout routines.
• View the profile and workout recordings for only one client at any time.
Business Requirements- Client Application
The Client app must allow clients to perform the following tasks:
• Browse a list of the trainer’s workout recordings.
• Record workouts by using the built-in webcam.
• Play, pause, restart, and stop workout recordings.
• If the capability is supported, allow the client’s webcam to pan as the client moves
around the room.
• Upload workout recordings for trainer review.
• Update their individual profiles to indicate workouts completed, calories burned, and
current weight.
The Client app must validate that the client’s subscription is valid.
Technical Requirements- General
The Client app must allow clients to perform the following tasks:
• Browse a list of the trainer’s workout recordings.
• Record workouts by using the built-in webcam.
• Play, pause, restart, and stop workout recordings.
• If the capability is supported, allow the client’s webcam to pan as the client moves
around the room.
• Upload workout recordings for trainer review.
• Update their individual profiles to indicate workouts completed, calories burned, and
current weight.
The Client app must validate that the client’s subscription is valid.
Technical Requirements- Hardware Requirements
The Personal Trainer and Client apps must support the following hardware requirements:
• Windows 8
• Webcam, microphone, and speakers
• Internet connection
While testing the apps, you identify the following issues:
• When you start the app for the first time, the system displays this warning message:
“This app needs permission to use your camera, which you can change in the app’s settings.”
• When you run the loadClientProfile( ) method in the clientData.js file, you receive an
“Access Denied” exception.
• The findCamera( ) method in the video.js file throws an exception on some devices.
• The recordVideo( ) method in the video.js file throws an exception when the device
does not support tilting.



###EndCaseStudy###

You need to retrieve the background task collection for the iteration loop.
Which code segment should you insert at line BG14?

###BeginCaseStudy###
Case Study: 1
Scenario 1
Application Information
You are developing two Windows Store apps by using JavaScript: a Personal Trainer app and
a Client app. The apps will allow personal fitness trainers to interact with their remote clients.
Business Requirements- Personal Trainer Application
The Personal Trainer app must allow trainers to perform the following tasks:
• Create and store video and audio recordings of workout routines.
• View the profile and workout recordings for only one client at any time.
Business Requirements- Client Application
The Client app must allow clients to perform the following tasks:
• Browse a list of the trainer’s workout recordings.
• Record workouts by using the built-in webcam.
• Play, pause, restart, and stop workout recordings.
• If the capability is supported, allow the client’s webcam to pan as the client moves
around the room.
• Upload workout recordings for trainer review.
• Update their individual profiles to indicate workouts completed, calories burned, and
current weight.
The Client app must validate that the client’s subscription is valid.
Technical Requirements- General
The Client app must allow clients to perform the following tasks:
• Browse a list of the trainer’s workout recordings.
• Record workouts by using the built-in webcam.
• Play, pause, restart, and stop workout recordings.
• If the capability is supported, allow the client’s webcam to pan as the client moves
around the room.
• Upload workout recordings for trainer review.
• Update their individual profiles to indicate workouts completed, calories burned, and
current weight.
The Client app must validate that the client’s subscription is valid.
Technical Requirements- Hardware Requirements
The Personal Trainer and Client apps must support the following hardware requirements:
• Windows 8
• Webcam, microphone, and speakers
• Internet connection
While testing the apps, you identify the following issues:
• When you start the app for the first time, the system displays this warning message:
“This app needs permission to use your camera, which you can change in the app’s settings.”
• When you run the loadClientProfile( ) method in the clientData.js file, you receive an
“Access Denied” exception.
• The findCamera( ) method in the video.js file throws an exception on some devices.
• The recordVideo( ) method in the video.js file throws an exception when the device
does not support tilting.



###EndCaseStudy###

You need to separate the business and complex logic into components.

Which actions should you perform? (Each correct answer presents part of the solution.
Choose all that apply.)

###BeginCaseStudy###
Case Study: 1
Scenario 1
Application Information
You are developing two Windows Store apps by using JavaScript: a Personal Trainer app and
a Client app. The apps will allow personal fitness trainers to interact with their remote clients.
Business Requirements- Personal Trainer Application
The Personal Trainer app must allow trainers to perform the following tasks:
• Create and store video and audio recordings of workout routines.
• View the profile and workout recordings for only one client at any time.
Business Requirements- Client Application
The Client app must allow clients to perform the following tasks:
• Browse a list of the trainer’s workout recordings.
• Record workouts by using the built-in webcam.
• Play, pause, restart, and stop workout recordings.
• If the capability is supported, allow the client’s webcam to pan as the client moves
around the room.
• Upload workout recordings for trainer review.
• Update their individual profiles to indicate workouts completed, calories burned, and
current weight.
The Client app must validate that the client’s subscription is valid.
Technical Requirements- General
The Client app must allow clients to perform the following tasks:
• Browse a list of the trainer’s workout recordings.
• Record workouts by using the built-in webcam.
• Play, pause, restart, and stop workout recordings.
• If the capability is supported, allow the client’s webcam to pan as the client moves
around the room.
• Upload workout recordings for trainer review.
• Update their individual profiles to indicate workouts completed, calories burned, and
current weight.
The Client app must validate that the client’s subscription is valid.
Technical Requirements- Hardware Requirements
The Personal Trainer and Client apps must support the following hardware requirements:
• Windows 8
• Webcam, microphone, and speakers
• Internet connection
While testing the apps, you identify the following issues:
• When you start the app for the first time, the system displays this warning message:
“This app needs permission to use your camera, which you can change in the app’s settings.”
• When you run the loadClientProfile( ) method in the clientData.js file, you receive an
“Access Denied” exception.
• The findCamera( ) method in the video.js file throws an exception on some devices.
• The recordVideo( ) method in the video.js file throws an exception when the device
does not support tilting.



###EndCaseStudy###

You need to enable debugging on the Personal Trainer app.
Which JavaScript project properties should you set? (Each correct answer presents part of
the solution Choose all that apply.)