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| Section | Objectives |
|---|---|
| Web Application Development Concepts | - Client-side storage
|
| JavaScript Programming | - Core JavaScript concepts
|
| HTML Fundamentals | - Document structure and semantics
|
| CSS Styling | - Selectors and styling rules
|
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NEW QUESTION # 26
You are creating a form that asks a user to enter their phone number. The form must be submitted only if the phone number field is not empty and matches the format 111-444-7777. Which markup should you use?
Answer: B
Explanation:
The correct markup is option D. The type= " tel " input type is appropriate for telephone-number entry, but it does not automatically validate a specific telephone-number format because phone formats vary internationally. MDN notes that tel inputs allow telephone entry but are not automatically validated to a particular format. Therefore, a pattern attribute is required to enforce the exact structure. The regular expression [0-9]{3}-[0-9] {3}-[0-9]{4} requires three digits, a hyphen, three digits, another hyphen, and four digits, matching the requested format such as 111-444-7777. MDN defines the pattern attribute as a regular expression the input value must match for constraint validation. The required attribute is also necessary because the field must not be empty; MDN states that required indicates the user must specify a value before the form can be submitted. Option A only limits length. Option B lacks hyphen validation and required.
Option C hard-codes only specific digits. References/topics: HTML5 validation, tel, pattern, required, regular expressions.
NEW QUESTION # 27
Which three methods are associated with the HTML5 localStorage API? Choose 3.
Answer: B,C,E
Explanation:
The correct methods are setItem(), removeItem(), and clear(). The HTML5 Web Storage API exposes localStorage as a persistent key-value storage object for the current origin. Data stored in localStorage remains available after page reloads and browser restarts unless it is explicitly removed or cleared. setItem (key, value) stores a value under a named key or updates the value if the key already exists. removeItem(key) deletes one specific key-value pair from storage. clear() removes all key-value pairs from the storage object for that origin. These methods are part of the standard Storage interface used by both localStorage and sessionStorage. write is not a Web Storage method; it is associated with document-writing behavior, not application state storage. cookie is also incorrect because cookies are a separate browser storage mechanism accessed through document.cookie, not a method of localStorage. References/topics: Web Storage API, localStorage, Storage interface, application state, persistent key-value data.
NEW QUESTION # 28
Which element should you use to rotate an SVG square?
Answer: C
Explanation:
The correct element is animateTransform. In SVG, rotation is not produced by drawing a different shape; it is produced by applying a transformation to an existing graphical element, such as a < rect > representing a square. The < animateTransform > element is specifically designed to animate the transform attribute of a target SVG element, and its supported transformation types include translation, scaling, rotation, and skewing.
Therefore, to rotate a square, the square would normally be defined with a shape element such as < rect > , and an < animateTransform > child or associated animation would specify attributeName= " transform " and type= " rotate " . animateMotion is incorrect because it moves an element along a motion path rather than rotating the element itself. circle is a shape element, not an animation mechanism. path defines arbitrary vector geometry, but it does not by itself animate or rotate another object. References/topics: SVG graphics, SVG transformations, animation elements, transform attribute, rotation animation.
NEW QUESTION # 29
You define the Pet class as follows:
class Pet {
constructor(name, breed) {
this.name = name;
this.breed = breed;
this.show = function() {
var text = " < p > Your pet ' s name is " + name + " . The pet ' s breed is " + breed + " . < /p > " ; return text;
};
}
}
You need to derive a Dog class from the Pet class.
Complete the code by selecting the correct option from each drop-down list.
Note: You will receive partial credit for each correct selection.
Answer:
Explanation:
Explanation:
First blank: class Dog extends Pet {
Second blank: super(name, breed);
The correct syntax for deriving one JavaScript class from another is extends, so the derived class declaration must be class Dog extends Pet {. This creates Dog as a subclass of Pet, allowing Dog instances to inherit members defined by the Pet constructor, including name, breed, and the show() function assigned inside the parent constructor. Inside a derived class constructor, super() must be called before using this. The call super (name, breed); invokes the parent Pet constructor and passes the values required to initialize the inherited name and breed properties. Pet(name, breed); is incorrect because a class constructor cannot be invoked like a normal function. Pet.constructor(name, breed); is also incorrect because it does not call the parent constructor for the current instance. After super() runs, the Dog constructor can safely assign subclass-specific properties such as price and gender. References/topics: JavaScript classes, inheritance, extends, derived constructors, super(), custom class creation.
NEW QUESTION # 30
You are creating a script that reads a JSON menu file and displays the Entree, Price, and Description.
Complete the code by selecting the correct option from each drop-down list.
Note: You will receive partial credit for each correct selection.
Answer:
Explanation:
Explanation:
First drop-down: var xhr = new XMLHttpRequest();
Second drop-down: if(xhr.status===200){
Third drop-down: responseObject = JSON.parse(xhr.responseText);
The script must first create an XMLHttpRequest object, so the correct first selection is var xhr = new XMLHttpRequest();. This object performs the asynchronous request for menu.json. After the request finishes, the onload callback executes. The response should be processed only when the request succeeds, so the correct status check is if(xhr.status===200){; HTTP status 200 means the file was successfully retrieved.
Status codes 403, 404, and 500 represent forbidden access, missing resource, and server error conditions, so they are not appropriate for normal JSON processing. The JSON file is returned as plain text through xhr.
responseText, so it must be converted into a JavaScript object with JSON.parse(xhr.responseText). Once parsed, the code can access responseObject.menu[i].Entree, Price, and Description inside the loop and build the display output. responseXML is incorrect because the source file is JSON, not XML.
NEW QUESTION # 31
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