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Questions and Answers
What primary function does JavaScript serve in web development?
What primary function does JavaScript serve in web development?
- Defining the structure and content of web pages.
- Managing server-side operations and database interactions.
- Programming the behavior and interactions of web pages. (correct)
- Specifying the visual layout and style of web pages.
With which technologies does JavaScript directly interact to enhance web pages?
With which technologies does JavaScript directly interact to enhance web pages?
- Both HTML and CSS (correct)
- Only HTML
- Neither HTML nor CSS
- Only CSS
What is the primary role of HTML in the context of web development?
What is the primary role of HTML in the context of web development?
- To manage server-side operations.
- To define the content and structure of web pages. (correct)
- To control the interactivity of web elements.
- To specify the layout and styling of web pages.
What is the correct way to embed JavaScript code directly within an HTML document?
What is the correct way to embed JavaScript code directly within an HTML document?
What is the purpose of a JavaScript function?
What is the purpose of a JavaScript function?
In HTML, where can you include the <script> tag to embed JavaScript?
In HTML, where can you include the <script> tag to embed JavaScript?
In the following HTML snippet, what will be the result of clicking the button?
<p id="demo">A Paragraph</p>
<button type="button" onclick="myFunction()">Try it</button>
In the following HTML snippet, what will be the result of clicking the button?
<p id="demo">A Paragraph</p>
<button type="button" onclick="myFunction()">Try it</button>
Consider the following code:
<!DOCTYPE html>
<html>
<head>
<script>
function myFunction() {
document.getElementById("demo").innerHTML = "Paragraph changed.";
}
</script>
</head>
<body>
<h2>Demo JavaScript in Head</h2>
<p id="demo">A Paragraph</p>
<button type="button" onclick="myFunction()">Try it</button>
</body>
</html>
What happens when the 'Try it' button is clicked?
Consider the following code:
<!DOCTYPE html>
<html>
<head>
<script>
function myFunction() {
document.getElementById("demo").innerHTML = "Paragraph changed.";
}
</script>
</head>
<body>
<h2>Demo JavaScript in Head</h2>
<p id="demo">A Paragraph</p>
<button type="button" onclick="myFunction()">Try it</button>
</body>
</html>
What happens when the 'Try it' button is clicked?
What is a key advantage of using external JavaScript files?
What is a key advantage of using external JavaScript files?
What file extension is typically used for external JavaScript files?
What file extension is typically used for external JavaScript files?
How do you link an external JavaScript file to an HTML document?
How do you link an external JavaScript file to an HTML document?
What is a primary benefit of using cached JavaScript files?
What is a primary benefit of using cached JavaScript files?
Which of the following is NOT an advantage of using external JavaScript files?
Which of the following is NOT an advantage of using external JavaScript files?
In the context of JavaScript and HTML, what does the term 'event' refer to?
In the context of JavaScript and HTML, what does the term 'event' refer to?
If a JavaScript function is placed in the <head> section of an HTML document, how is it typically executed?
If a JavaScript function is placed in the <head> section of an HTML document, how is it typically executed?
Assume the following javascript code exists in an external file called myscript.js:
document.getElementById("myH").innerHTML = "paragraph changed";
Which of the following HTML code snippets would correctly import and execute this code?
Assume the following javascript code exists in an external file called myscript.js:
document.getElementById("myH").innerHTML = "paragraph changed";
Which of the following HTML code snippets would correctly import and execute this code?
What is the correct term for incorporating Javascript code directly between the <script> tags within an HTML file?
What is the correct term for incorporating Javascript code directly between the <script> tags within an HTML file?
Which of the following is the role of CSS in web development, alongside HTML and JavaScript?
Which of the following is the role of CSS in web development, alongside HTML and JavaScript?
Which statement is true regarding the placement of external script references?
Which statement is true regarding the placement of external script references?
Given an HTML document with a button, what attribute is typically used to specify a JavaScript function that should run when the button is clicked?
Given an HTML document with a button, what attribute is typically used to specify a JavaScript function that should run when the button is clicked?
Why is JavaScript considered an essential language for web developers?
Why is JavaScript considered an essential language for web developers?
Which of the following can JavaScript be used for?
Which of the following can JavaScript be used for?
What does the document.getElementById() method do in JavaScript?
What does the document.getElementById() method do in JavaScript?
What should a developer consider when deciding whether to place a <script> tag in the <head> or <body>?
What should a developer consider when deciding whether to place a <script> tag in the <head> or <body>?
What is a benefit of linking the same .js file to multiple HTML pages?
What is a benefit of linking the same .js file to multiple HTML pages?
Flashcards
What is JavaScript?
What is JavaScript?
JavaScript is the programming language of the web.
JavaScript's role in web development
JavaScript's role in web development
HTML defines the content, CSS specifies the layout, and JavaScript programs the behavior of web pages.
What is the <script> tag?
What is the <script> tag?
The <script> tag is used to insert JavaScript code in HTML.
JavaScript function
JavaScript function
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Where to put JavaScript in HTML
Where to put JavaScript in HTML
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What is External JavaScript?
What is External JavaScript?
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How to use an external script?
How to use an external script?
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Why use external scripts?
Why use external scripts?
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Benefits of external JavaScript files
Benefits of external JavaScript files
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JavaScript file extension
JavaScript file extension
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Study Notes
- JavaScript is specified as the programming language of the web
- JavaScript can update and change both HTML and CSS
- JavaScript can calculate, manipulate, and validate data
Why Study JavaScript
- JavaScript is one of 3 languages web developers need to learn
- HTML defines the content of web pages
- CSS specifies the layout of web pages
- JavaScript programs the behavior of web pages
The <script> tag
- JavaScript code is inserted between
<script>and</script>tags document.getElementById("demo").innerHTML = "My First JavaScript";will insert "My First JavaScript" between the tags
JavaScript Functions and Events
- A JavaScript function is a block of JavaScript code
- It can be executed when "called"
- A function can be called when an event occurs
- This includes when the user clicks a button
JavaScript in <head> or <body>
- Any number of scripts can be placed in an HTML document
- Scripts can be placed in the
<body>or the<head>section of an HTML page - They can also be placed in both
JavaScript in <head>
- It invokes the function when a button is clicked
- A JavaScript function can be placed in the
<head>section of an HTML page
JavaScript in <body>
- It invokes the function when a button is clicked
- A JavaScript function can be placed in the
<body>section of an HTML page
External JavaScript
- Scripts can be placed in external files
- For example: myScript.js
- External scripts are helpful when the same code is used in many web pages
- JS files have the file extension
.js - To use an external script, use the script file name in the source attribute of a
<script>tag <script src="myScript.js"></script>
External JavaScript Tag locations
- An external script reference can be placed in
<head>or<body> - The script will act as if it was located exactly where the
<script>tag is
External JavaScript Advantages
- Placing scripts in external files has some advantages
- It separates HTML and code
- It makes HTML and JavaScript easier to read and maintain
- Cached JavaScript files can speed up page loads
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