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| Section | Objectives |
|---|---|
| JavaScript Coding | - JavaScript ES6 Development
|
| Forms | - HTML5 Forms and Validation
|
| Layouts | - Responsive and Flexible Layouts
|
| Graphics and Animation | - Canvas and SVG
|
| Application Lifecycle Management | - Application Development Lifecycle
|
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質問 # 53
You need to complete the code for a registration form that must meet the following criteria:
* The Password must be 6-8 characters long and use only letters and numbers.
* The Member ID must follow the pattern ###-##-###.
Complete the markup by selecting the correct option from each drop-down list.
Note: You will receive partial credit for each correct selection.
正解：
解説：
Explanation:
First drop-down: maxlength=8
Second drop-down: pattern=[A-Za-z0-9]{6,8}
Third drop-down: pattern=[0-9]{3}-[0-9] {2}-[0-9]{3}
The password field needs two constraints. maxlength=8 limits the user to a maximum of eight characters, satisfying the upper length requirement. The pattern=[A-Za-z0-9]{6,8} attribute enforces the complete password rule: only uppercase letters, lowercase letters, and digits are allowed, and the total length must be between six and eight characters. A pattern without {6,8} would not enforce the minimum length, and {1,8} would incorrectly allow passwords shorter than six characters. The Member ID field must follow the visible placeholder format 123-45-678, which is three digits, a hyphen, two digits, another hyphen, and three digits.
Therefore, the correct member ID pattern is pattern=[0-9] {3}-[0-9]{2}-[0-9] {3}. The hyphens must be included literally in the pattern because the required format contains them. max=8 is not appropriate for password text length, and size=8 only controls display width, not validation.
質問 # 54
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.
正解：
解説：
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.
質問 # 55
Which two statements correctly describe media queries? Choose 2.
正解：C、D
解説：
Media queries support responsive web design and allow different CSS rules to be applied at different screen sizes, device characteristics, or breakpoints. MDN describes media queries as a CSS mechanism for applying styles depending on media type and device or viewport characteristics, including width, height, resolution, and orientation. This is the foundation of responsive design because a page can adapt its layout for phones, tablets, laptops, and desktop displays without changing the HTML document. Breakpoints are the points where the design changes; MDN identifies them as the points where a media query is introduced to improve layout behavior across viewport sizes. Statement A is not generally correct because media queries are primarily a styling and layout mechanism, not a direct performance optimization. They can sometimes help avoid unsuitable layouts, but performance improvement is not their defining purpose. Statement D is incorrect because media queries are CSS rules; they do not execute or dynamically process JavaScript code. References
/topics: responsive design, CSS media queries, viewport width, breakpoints, adaptive layout rules.
質問 # 56
You need to create the layout shown, which defines five content areas:
* Logo and page title
* Menu
* Main content area
* Additional content area
* Copyright and contact information
You define the following classes:
正解：A
解説：
The correct answer is D because the layout shown is a named-area CSS Grid layout. The mockup contains five semantic regions: the top header area for the logo and page title, a left-side menu, a central main content area, a right-side additional content area, and a bottom copyright/contact area. In CSS Grid, this type of visual structure is defined with grid-template-areas, where each quoted string represents one grid row and each repeated name represents how far that area spans across columns. In option D, heading spans the full top row, menu occupies the left column across the lower rows, content fills the main center region, right fills the additional content region, and contact spans the bottom row to the right of the menu. Option A only defines row and column sizes and does not name the five content areas. Options B and C are invalid for this purpose because named layout strings do not belong in grid-template-rows or grid-template-columns. References
/topics: CSS Grid, grid containers, display: grid, named grid areas, grid-template-areas, page layout construction.
質問 # 57
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?
正解：C
解説：
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.
質問 # 58
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