This jQuery quiz continues where the previous one left off, covering questions 21-30. Test your jQuery knowledge and see how many you can answer correctly. Corrections are welcome in the comments section. Let's begin!

Question 21

If using the jQuery UI library, which of these are valid second arguments for addClass('turnRed', secondArgument);?

• 'fast'
• slow
• 1000ms
• '1000ms'
• 3000

Correct Answers: 'fast', '1000ms', 3000

Question 22

The is() function does what to the current selection against an expression?

• checks
• filters
• gets
• converts

Correct Answer: checks
API Reference

Question 23

What does $('tr.rowClass:eq(1)'); return?

• One element set, the first row of the first table.
• One element set, the second row of the first table.
• A set of <tr> tags with class "rowClass:eq(1)". <li>A set of <code><tr> tags with class "eq(1)". <p><strong>Correct Answer:</strong> One element set, the second row of the first table. <a href="http://m.miracleart.cn/link/2aca752107ac2bde4cd02805118de503">See it in action</a></p> <p><strong>Question 24</strong></p> <p><code>innerHeight() returns the inner height of an element, including/excluding the border, margin, and padding?
  • excludes, excludes, excludes
  • includes, excludes, includes
  • excludes, excludes, includes
  • includes, includes, includes

  Correct Answer: excludes, excludes, includes API Reference

  Question 25

  What alert message appears when clicking "id1" in this code?

  var message = 'Message';
  $('#id1').bind('click', {
      msg: message
  }, function (event) {
      alert(event.data.msg);
  });
  message = 'New message';
  $('#id2').bind('click', {
      msg: message
  }, function (event) {
      alert(event.data.msg);
  });

  • Message
  • New Message
  • nothing
  • None of the above

  Correct Answer: Message See it in action

  Question 26

  Which function returns an empty set when .end() is chained after it?

  • add
  • children
  • filter
  • remove

  Correct Answer: remove .remove() returns jQuery(document), considered an empty set. See it in action

  Question 27

  What does $("#div1").ajaxStart(function1()); do?

  • Attaches a function to execute before an Ajax request.
  • Attaches a function to execute whenever any Ajax request begins.
  • Attaches a function to execute when an Ajax request begins and none are active.
  • None of the above.

  Correct Answer: Attaches a function to execute when an Ajax request begins and none are active. API Reference

  Question 28

  What does $('#div1').html().replace(/bad/, "good"); do?

  • Replaces "bad" in #div1's HTML with "good".
  • Replaces words containing "bad" in #div1's HTML with "good".
  • Replaces the first "bad" in #div1's HTML with "good".
  • Replaces the first word containing "bad" in #div1's HTML with "good".

  Correct Answer: Replaces the first occurrence of "bad" in #div1's HTML with "good". See it in action

  Question 29

  What are the valid arguments for function1 in $.map(array1, function1);?

  • The index of the element.
  • The element itself.
  • Both a and b
  • function1 has no arguments.

  Correct Answer: Both a and b API Reference

  Question 30

  Which are valid arguments for the eq() function?

  • 1
  • '2'
  • -1

  Correct Answer: All of them. See it in action API Reference

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