Using JavaScript and JSON in Django | Week 3

Course Name: Django for Everybody

Sub-course: Using JavaScript and JSON in Django

Course Link: Django for Everybody

Sub-course Link: Django Features and Libraries

These are Using JavaScript and JSON in Django Week 3 Answers Coursera Quiz

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JavaScript and the Browser

Q1. What does the following JavaScript accomplish?

• Ascertain if the document is ready to load
• Clear the browser window so drawing can start in the upper left hand corner
• Enable the retrieval of data in the JSON format
• Register a function that will be called when the HTML document is completely loaded

Answer: Register a function that will be called when the HTML document is completely loaded

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Q2. What portion of the DOM (Document Object Model) will be affected by the following JavaScript statement:

• All elements in the DOM
• All tags with a class atribute of “para”
• A tag with an id atribute of “para”
• A tag with a class atribute of “para”

Answer: A tag with an id atribute of “para”

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These are Using JavaScript and JSON in Django Week 3 Answers Coursera Quiz

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Q3. What does the following JavaScript code do?

• Replace all the HTML on the page
• Write HTML into the “under construction” DOM
• Replace the contents of all p tags in the DOM
• Scroll the window to the bottom of all content

Answer: Write HTML into the “under construction” DOM

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Q4. Which of the following lines will call the function “myFunc” five seconds in the future.

• setTimeout(myFunc, 5);
• setTimeout(‘myFunc’, 5);
• setTimeout(myFunc, 5000);
• setTimeout(myFunc(), 5000);

Answer: setTimeout(myFunc, 5000);

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These are Using JavaScript and JSON in Django Week 3 Answers Coursera Quiz

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Q5. When do we see a scroll bar in a browser?

• When the ‘EnableScroll’ event is active
• When the window is larger than the DOM
• When the DOM is too large to fit in the window
• When the window height is increased

Answer: When the DOM is too large to fit in the window

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Q6. Which of the following JavaScript statements will hide spiner.gif in this HTML?

• $(“.chatcontent”).toggle();
• document.getElementById(“chatcontent”).style.display = ‘none’
• document.getElementById(“chatcontent”).hide();
• document.getElementById(“#chatcontent”).hide();
• $(“#chatcontent”).hide();

Answer: document.getElementById(“chatcontent”).style.display = ‘none’

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These are Using JavaScript and JSON in Django Week 3 Answers Coursera Quiz

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Q7. What does document.createElement() do?

• Clear the contents of a div from AJAX
• Start the server session for the current browser tab
• Create a new element / tag that is not connected to the document
• Open a blank window in a new browser tab

Answer: Create a new element / tag that is not connected to the document

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Q8. The ‘onclick=’ attribute is effectively a shotcut to which of these methods?

• addClickHandler()
• document.ready()
• addEventListener()
• document.onClick()

Answer: addEventListener()

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These are Using JavaScript and JSON in Django Week 3 Answers Coursera Quiz

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Q9. When using fetch(), what is the purpose of the .then() method?

• Trigger code after the form POST completes successfully
• Stop DOM display updates from happening until the URL is retrieved
• Register code to be execute when the fetch promise is completed
• Release the memory that was allocated using malloc()

Answer: Register code to be execute when the fetch promise is completed

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Q10. Which is the better way to retrieve data in JavaScript – promises / then or async / await?

• None of the above – using input() is the best practice in JavaScript
• It depends and there are a lot of different opinions
• Async / await
• Promises

Answer: It depends and there are a lot of different opinions

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These are Using JavaScript and JSON in Django Week 3 Answers Coursera Quiz

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