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Programming in HTML5 with JavaScript and CSS3

Question No: 141 HOTSPOT – (Topic 3)

You develop an HTML5 webpage that contains the following markup and code:

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You have the following requirements:

-> Display a message if users select the first OPTION element, and then submit the form.

-> Do not display an alert message if users select any other OPTION element, and

then submit the form.

You need to implement the madeSelection() function.

How should you complete the relevant code? (To answer, select the appropriate code segment from each drop-down list in the answer area.)

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Answer:

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Explanation:

Dumps4Cert 2018 PDF and VCE

  • The lt;selectgt; element is used to create a drop-down list.

    The lt;optiongt; tags inside the lt;selectgt; element define the available options in the list.

  • option.value text

Specifies the value to be sent to a server

Question No: 142 – (Topic 3)

You are modifying a blog site to improve search engine readability.

You need to group relevant page content together to maximize search engine readability.

Which tag should you use?

  1. lt;articlegt;

  2. lt;spangt;

  3. lt;tbodygt;

  4. lt;cdgt;

Answer: A

Explanation: How the Changes in HTML 5 Will Affect SEO (Search Engine Optimization)?

As a SEO expert, you are most likely interested mainly in those changes in the HTML 5 specification, which will affect your work. Here is one of them:

A new lt;articlegt; tag. The new lt;articlegt; tag is probably the best addition from a SEO point of view. The lt;articlegt; tag allows to mark separate entries in an online publication, such as a blog or a magazine. It is expected that when articles are marked with the lt;articlegt; tag, this will make the HTML code cleaner because it will reduce the need to use lt;divgt; tags.

Also, probably search engines will put more weight on the text inside the lt;articlegt; tag as compared to the contents on the other parts of the page.

Question No: 143 – (Topic 3)

You are developing an HTML5 web application that displays stock information. The application loads information from a web service by using AJAX.

The following code defines a Stock object and loads stock data.

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You need to implement the loadStock function. Which code segment should you use?

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  1. Option A

  2. Option B

  3. Option C

  4. Option D

Answer: A

Question No: 144 DRAG DROP – (Topic 3)

You are implementing a web worker by using JavaScript and HTML5. The web worker processes a long-running loop and returns the result to a webpage.

The web worker is defined on the webpage as follows:

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You have the following requirements:

-> Evaluate the message value in the web worker.

-> Process the loop based on the iterations value that is passed from the webpage.

-> Return a value back to the webpage from the web worker.

You need to implement the web worker.

How should you complete the relevant code? (To answer, drag the appropriate code segment to the correct location or locations in the answer area. Use only code segments that apply.)

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Answer:

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Explanation: Box 1:

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Box 2:

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Box 3:

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Note:

* The event object for a message event supports the following additional properties:

the data property contains the message,

the origin property retrieves the scheme, hostname and port of the document that invoked the postMessage method,

the source property refers to the window object that contains the document that invoked the postMessage method,

the lastEventId property returns the identifier of the last message.

Question No: 145 DRAG DROP – (Topic 3)

You create an HTML5 application that includes JavaScript. The application performs several AJAX requests. One AJAX request retrieves order information from a web service and then sends the information back to a webpage within the application.

You must create a custom event. You have the following requirements:

-> The webpage must contain an HTML element named ordersListing that will receive the custom event notification.

-> The event name must be ordersReceived.

-> The event must pass a custom value named orderCount.

-> The event must run a JavaScript method named showOrdersReceivedCount after the orders Listing HTML element receives the event.

-> Do not allow other DOM elements to receive the event.

-> Allow the event to be cancelled.

-> Send the event into the event system.

You need to implement the custom event to notify specific DOM elements of the AJAX response.

Which three actions should you perform in sequence? (Develop the solution by selecting the required code segments and arranging them in the correct order.)

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Answer:

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Explanation:

Box 1:

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Box 2:

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Box 3:

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  • From Scenario: Do not allow other DOM elements to receive the event. So: bubbles: false

  • From scenario: Allow the event to be cancelled. So: cancellable: true

  • From scenario:

    The webpage must contain an HTML element named ordersListing that will receive the custom event notification.

  • Events which are designated as bubbling will initially proceed with the same event flow as non-bubbling events. The event is dispatched to its target EventTarget and any event listeners found there are triggered. Bubbling events will then trigger any additional event listeners found by following the EventTarget#39;s parent chain upward, checking for any event listeners registered on each successive EventTarget. This upward propagation will continue up to and including the Document. EventListeners registered as capturers will not be triggered during this phase. The chain of EventTargets from the event target to the top of the tree is determined before the initial dispatch of the event. If modifications occur to the tree during event processing, event flow will proceed based on the initial state of the tree.

    Note:

  • Ajax (an acronym for Asynchronous JavaScript and XML) is a group of interrelated web development techniques used on the client-side to create asynchronous web applications. With Ajax, web applications can send data to, and retrieve data from, a server asynchronously (in the background) without interfering with the display and behavior of the existing page. Data can be retrieved using the XMLHttpRequest object. Despite the name, the use of XML is not required (JSON is often used instead), and the requests do not need to be asynchronous.

    Question No: 146 – (Topic 3)

    You are creating an HTML5 application that allows users to play video on a page by using the VIDEO element.

    You need to enable the user to start, stop, and pause the video. Which line of code should you add to the page?

    1. lt;video id= quot;myVideoquot; height=quot;320quot; width=quot;400quot; src=quot;myVideo.vttquot; contextmenu=quot;pauseplayquot;gt; lt;/videogt;

    2. lt;video id=quot;myVideon heightquot;=quot;320quot; width=quot;400quot; src=quot;myVideo.vttquot; controlsgt; lt;/videogt;

    3. lt;video _d=quot;myVideon height=quot;320quot; width=quot;400quot; src=quot;myVideo.vttquot; autoplaygt; lt;/videogt;

    4. lt;video id=quot;myVideoquot; height=quot;320quot; width=quot;400quot; src=quot;myVideo.vttquot; contextinenu=quot;Startstopngt; lt;/videogt;

    Answer: B

    Explanation: The HTML lt;videogt; Element

    To show a video in HTML, use the lt;videogt; element:

    The controls attribute adds video controls, like play, pause, and volume. Example

    lt;video width=quot;320quot; height=quot;240quot; controlsgt;

    lt;source src=quot;movie.mp4quot; type=quot;video/mp4quot;gt;

    lt;source src=quot;movie.oggquot; type=quot;video/oggquot;gt; Your browser does not support the video tag.

    lt;/videogt;

    Reference: HTML5 Video

    Question No: 147 HOTSPOT – (Topic 3)

    You troubleshoot a webpage that includes the following code segment:

    Dumps4Cert 2018 PDF and VCE

    You need to evaluate the value of the variable named customer.name.

    For each statement in the table, select Yes if the code segment above causes the variable to evaluate as described. Select No if it does not. Make only one selection in each column.

    Dumps4Cert 2018 PDF and VCE

    Answer:

    Dumps4Cert 2018 PDF and VCE

    Explanation:

    Dumps4Cert 2018 PDF and VCE

    The variable customer is undefined, as it outside the scope of the function, at line alert(customer.name);

    Question No: 148 – (Topic 3)

    You are developing an application that analyzes population data for major cities in the United States. The application retrieves population statistics for a city by using a web service.

    You need to request data from the web service by using jQuery. Which code segment should you use?

    Dumps4Cert 2018 PDF and VCE

    1. Option A

    2. Option B

    3. Option C

    4. Option D

    Answer: D Explanation: * type:

    We post a SOAP request.

  • data:

    Data to be sent to the server.

    The data option can contain either a query string of the form key1=value1amp;key2=value2, or an object of the form {key1: #39;value1#39;, key2: #39;value2#39;}.

    Reference: jQuery.ajax()

    Question No: 149 DRAG DROP – (Topic 3)

    You create a webpage that includes the following HTML markup: (Line numbers are included for reference only.)

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    You need to ensure that a form cannot be submitted unless the INPUT element contains the word OK.

    Which five actions should you perform in sequence? (To answer, move the appropriate actions from the list of actions to the answer area and arrange them in the correct order.)

    Dumps4Cert 2018 PDF and VCE

    Answer:

    Dumps4Cert 2018 PDF and VCE

    Explanation:

    Box 1:

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    Box 2:

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    Box 3:

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    Box 4:

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    Box 5:

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    first

    Selects the first matched element.

    Question No: 150 – (Topic 3)

    You develop a web application by using jQuery. You develop the following jQuery code: (Line numbers are included for reference only.)

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    The web application exposes a RESTful web API that has an endpoint of/product/create. You need to create a new product by using AJAX.

    Which code segment should you insert at line 05?

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    1. Option A

    2. Option B

    3. Option C

    4. Option D

    Answer: D

    Explanation: * url: /product/create This is the endproduct.

  • datatype:

    The type of data that you#39;re expecting back from the server.

  • contentType (default: #39;application/x-www-form-urlencoded; charset=UTF-8#39;) Reference: jQuery.ajax()

Topic 4, Volume D

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