JS Practice

You are a creating a web page with a script.

The script will insert the window's location inside the page's input element.

Sort the elements bellow according to the order in the script:

• window.location

• .href

• getElementById('url').

• value =

•        document.

Answer explanation

This code creates a web page with an input field that displays the URL of the current page when loaded in a web browser.

A JavaScript array is initialized as follows: 

var array=[20,40,60,80];

 

You write the following code to manipulate the array:  

array.shift(); 

array.pop(); 

array.push(10); 

array.unshift(100);

Sort the final result of the array by dragging the elements:

• 100

• 60

• 10

• 40

You need to write a loop that will traverse the length of an array to find the value orange. If an array element value is null, the code should immediately go to the next element. When the value is found, the loop should exit. 

How should you complete the code?

Drag the elements to the correct position according to the statement.

b

a

e

continue

break

for

while

do

Evaluate the following code. Line numbers are included for reference only.

 

var n = 50;

var c = n + 5;

var a = n % 2;

var d = c / 11;

n = d * 2;

console.log (n, c, a, d);
​ ​ ​ (a)  

What is the console result of the variables n,c,a,d?

​ Choose the correct option.

• 10, 55, 0, 5
• 10, 5, 55, 0
• 0, 10, 55, 5

totalscore is in the correct format according to standard naming conventions for JavaScript

• Yes

• No

You are designing a web page that contains a blue button. When the button is pressed, it should call a function that displays the message "Welcome!".

When the cursor hovers over the button, the button should turn red. When the cursor leaves the button, the button should revert back to its original color of blue.

You want to complete the markup using the appropriate HTML events.

How should you complete the markup?

To answer, select the appropriate event in the answer area.

b

d

c

onkeydown

onmousedown

onmouseout

onclick

onmouseover

Form POST requests will always remain in the browser history.

• Yes

• No

Answer explanation

POST requests do not appear in the browser history as a unique URL, since the submitted data is not in the URL but in the body of the request. However, the page to which the form is submitted may appear in the browser history.

When using a GET request with a form, the data length is restricted.

• Yes

• No

Answer explanation

When a form is submitted using the GET method, the form data is added to the URL as query parameters. URLs have a maximum length, so the amount of data that can be submitted using a GET request is limited.

Only GET requests should  be used when handling sensitive form data.

• Yes

• No

Answer explanation

In fact, it is the other way around: GET requests should not be used to send sensitive data, since the query parameters in the URL are visible and can be stored in the browser history or server logs. Instead, POST requests should be used to send sensitive data.

Form POST request are cached.

• Yes

• No

Answer explanation

POST requests are generally not cached by browsers or proxy servers, as they are typically used to submit data that changes the state of the server (e.g., submitting a registration form or making a purchase).