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WGU Web Development Applications Sample Questions (Q65-Q70):
NEW QUESTION # 65
Given the following code:
Which type of user input does the developer request by specifying the pattern attribute?
Answer: B
Explanation:
The pattern attribute in the <input> element is used to specify a regular expression that the input's value must match for it to be considered valid. The given pattern -?d{1,3}.d+ matches strings that represent decimal numbers with an optional negative sign, typically used for latitude and longitude values.
* Pattern Explanation:
* -? allows for an optional negative sign.
* d{1,3} matches one to three digits.
* . matches a literal dot.
* d+ matches one or more digits.
* Usage Example:
<input type="text" pattern="-?d{1,3}.d+" placeholder="Enter latitude or longitude"> This pattern ensures the input matches the format of latitude/longitude values.
References:
* MDN Web Docs on <input> pattern attribute
* Regular Expressions Documentation
NEW QUESTION # 66
What allows a scripting language to manipulate elements on a web page?
Answer: A
Explanation:
The Document Object Model (DOM) is an API for HTML and XML documents that defines the logical structure of documents and the way a document is accessed and manipulated.
* DOM Explanation:
* The DOM represents the page so that programs can change the document structure, style, and content.
* It provides a way for scripts to update the content, structure, and style of a document while it is being viewed.
* Explanation:
* Option A: CSS is incorrect because it is used for styling web pages.
* Option B: XML is incorrect because it is a markup language, not an API for manipulating web page elements.
* Option C: HTML is incorrect because it is the markup language used to create web pages, not an API for manipulation.
* Option D: DOM is correct because it allows a scripting language to manipulate elements on a web page.
* References:
* MDN Web Docs - DOM
* W3Schools - JavaScript HTML DOM
NEW QUESTION # 67
What is a characteristic of JavaScript code?
Answer: D
Explanation:
JavaScript is a scripting language primarily used for creating and controlling dynamic website content. Here are some characteristics:
* Runs Inside a Web Browser: JavaScript code is executed in the web browser, making it possible to create interactive and dynamic web pages.
* Cross-Browser Compatibility: JavaScript is designed to be compatible across different web browsers.
* Interpreted Language: JavaScript is interpreted, meaning it does not need to be compiled before execution.
* Accessible to Users: JavaScript code is not hidden from the user; it can be viewed in the browser's developer tools.
References:
* MDN Web Docs on JavaScript
* W3C JavaScript Introduction
NEW QUESTION # 68
Given the following code:
Var a = ''true'';
What is the data type of d?
Answer: A
Explanation:
The data type of the variable a is determined by the value assigned to it. In JavaScript, if a value is enclosed in double or single quotes, it is treated as a string.
* Variable Assignment:
* Given the code:
var a = "true";
* The value "true" is enclosed in double quotes, making it a string.
* Explanation:
* Option A: Boolean is incorrect because the value "true" is a string, not a boolean.
* Option B: String is correct because the value is enclosed in double quotes.
* Option C: Object is incorrect because the value is a primitive string.
* Option D: Undefined is incorrect because the variable a is assigned a value.
* References:
* MDN Web Docs - JavaScript Data Types
* W3Schools - JavaScript Data Types
NEW QUESTION # 69
What is the process for JavaScript from validation?
Answer: B
Explanation:
JavaScript form validation typically occurs after the form is submitted but before the form data is sent to the server. This allows the client-side script to check the input data and prevent the form from being submitted if the data is invalid.
* Client-Side Validation:
* Before Form Submission: JavaScript validates the form fields after the user attempts to submit the form.
* Prevent Default Submission: If the validation fails, JavaScript can prevent the form from being submitted and display appropriate error messages.
* Usage Example:
document.getElementById("myForm").addEventListener("submit", function(event) { var isValid = true;
// Perform validation checks
if (!isValid) {
event.preventDefault(); // Prevent form submission
alert("Please correct the errors.");
}
});
This example prevents form submission if the validation fails.
References:
* MDN Web Docs on Form Validation
* W3C HTML Specification on Form Submission
NEW QUESTION # 70
......
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