Chapter 4 : JavaScript Introduction

What is Javascript mainly used for?

• To define the content of Webpages

• To determine the behaviour of Webpages

• To specify the layout of Webpages

Javascript is a(an) ...

• language used to enhance HTML pages

• language primarily used in creating Mobile Apps

• scripting language, primarily used on the Web

• an interpreted language and doesn't need to be compiled.

Where can you place your Javascript?

• Anywhere inside a HTML page

• In an external file which ends with ".txt"

• In an external file which ends with ".js"

• Inside the <script> tags inside the HTML page

Given the following paragraph element.

<p id="apple"></p>

Which code will you use to change its contents?

• document.getElementById("apple").value = "Hello";

• document.getElementById("banana").value = "Hello";

• document.getElementById("banana").innerHTML = "Hello";

• document.getElementById("apple").innerHTML = "Hello";

Which of the following HTML code for a paragraph that will work with following Javascript and display "Displayed"

document.getElementById("banana").innerHTML = "Displayed";

• <p id="banana">Not Displayed</p>

• <p id="apple">Displayed</p>

• <div id="banana">Displayed</div>

• <div id="apple">Displayed</div>

Which of these commands will write "Hello" directly into a Webpage

• console.log("Hello");

• window.alert("Hello");

• document.write("Hello");

Which of these commands will write "Hello" directly into the console?

• console.log("Hello");

• window.alert("Hello");

• document.write("Hello");

Which command allows you to ask the user for some input?

• window.alert("Please enter a value");

• window.confirm("Please enter a value");

• window.prompt("Please enter a value");

Which command will ask user to confirm an action?

• window.alert("Please enter a value");

• window.confirm("Please enter a value");

• window.prompt("Please enter a value");

What message will pop-up when the following code is executed?

// window.alert("Hello");

window.alert("Hi");

/* window.alert("Welcome"); */

• Hello

• Hi

• Welcome