Week 14_Lesson 1

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Questions and Answers

Which jQuery selector would select all elements within a document?

$('.ps')

$('*') (correct)

$('#elementId')

$('p:first')

The :first selector in jQuery selects the last element of a specified type.

False

What is the purpose of jQuery events?

To respond to user actions on a web page.

The _____ selector selects all elements with a specific attribute.

[attribute] Signup and view all the answers

Match the following jQuery selectors with their descriptions:

$('*') = Selects all elements $('p:first') = Selects the first paragraph element $('[id]') = Selects elements with an id attribute $('.ps') = Selects elements with class 'ps' Signup and view all the answers

Which jQuery method is used to assign click events to all paragraphs?

$('p').click() Signup and view all the answers

The jQuery selector $('.className') selects elements by their unique id.

False Signup and view all the answers

Write a jQuery code snippet to hide all elements with the class 'hidden'.

$('.hidden').hide(); Signup and view all the answers

What does the selector $('p.intro') do?

Selects all elements with class 'intro' Signup and view all the answers

$(':button') selects all button elements on a webpage.

True Signup and view all the answers

What selector would you use to select the first child of every unordered list?

ul li:first-child Signup and view all the answers

The selector $('') selects all elements with a ____ attribute.

href Signup and view all the answers

Which selector would hide all elements with class 'ps' when a button is clicked?

$('button').click(function() { $('.ps').hide(); }) Signup and view all the answers

$('tr:odd') selects only the odd rows of a table.

True Signup and view all the answers

What does the selector $('a[target!=_blank]') achieve?

Selects all anchor elements that do not open in a new tab. Signup and view all the answers

Which of the following is a correct jQuery selector to hide an element with the id 'test'?

$('#test').hide() Signup and view all the answers

JQuery selectors start with the dollar sign followed by the selector inside parentheses.

True Signup and view all the answers

What does the jQuery selector $('.test') do?

It hides all elements with the class 'test'. Signup and view all the answers

To hide all
elements using jQuery, you would write: $_______('p').hide();

$ Signup and view all the answers

Match the jQuery selectors to their descriptions:

$('#test') = Selects an element with a specific id $('.className') = Selects all elements with a specific class $('element') = Selects all elements of a specified type $('[attribute=value]') = Selects elements with a specific attribute and value Signup and view all the answers

Which of the following selector types can be used to hide elements based on their class?

Class Selector Signup and view all the answers

The jQuery syntax for a selector includes an action to be performed immediately after selecting an element.

True Signup and view all the answers

Which jQuery method would you use to hide the current HTML element?

$(this).hide() Signup and view all the answers

What is the basic syntax for selecting an HTML element and performing an action in jQuery?

$().action() Signup and view all the answers

Which selector would hide an HTML element with the id 'test'?

$('#test').hide() Signup and view all the answers

What does the jQuery selector $('p').hide() do?

Hides all elements Signup and view all the answers

What does the $(this).hide() selector do within an event handler?

Hides the current HTML element that triggered the event Signup and view all the answers

Which of the following is a key characteristic of jQuery selectors?

They can select elements based on attributes and values. Signup and view all the answers

How do jQuery selectors improve upon standard CSS selectors?

They include custom selection capabilities. Signup and view all the answers

What is a valid way to select all elements with the class name 'test' in jQuery?

$('.test').hide() Signup and view all the answers

What does the jQuery action method do in the syntax $(selector).action()?

It performs an action on the selected elements. Signup and view all the answers

What does the selector $('p:first').hide() do?

Hides only the first element on the page. Signup and view all the answers

Which jQuery selector would hide all elements with an id attribute when a button is clicked?

$("[id]").hide(); Signup and view all the answers

When using jQuery, which of the following correctly collects click events on all paragraphs?

$('p').click(function(){...}); Signup and view all the answers

What type of elements does the all selector $('*') hide?

All elements regardless of their type. Signup and view all the answers

Which statement about jQuery events is false?

Events can only be triggered by mouse actions. Signup and view all the answers

Which jQuery code snippet hides all
elements when a button is clicked?

$('button').on('click', function() { $('p').hide(); }); Signup and view all the answers

What does the selector $([id]) refer to?

All elements with an id attribute. Signup and view all the answers

Which jQuery selector would hide the first element of a specific type such as
?

$('h1:first').hide(); Signup and view all the answers

What is the purpose of the jQuery selector $('p:first')?

Selects the first element only. Signup and view all the answers

Which selector would you use to select all
elements with a class of 'intro'?

$('p.intro') Signup and view all the answers

What does the jQuery selector $('tr:even') achieve?

Selects all even-numbered <tr> elements. Signup and view all the answers

What will $('button').click(function() { $('#p1').hide(); }) do when executed?

Hide the element with id 'p1' when a button is clicked. Signup and view all the answers

Which jQuery selector is used to select elements based on their attribute value being not equal to a specified value?

$('a[target!="_blank"]') Signup and view all the answers

What does the jQuery selector $(':button') select?

Selects all <button> elements and input elements of type 'button'. Signup and view all the answers

Which jQuery selector will select all elements that have an href attribute?

$('[href]') Signup and view all the answers

When using the jQuery selector $('ul li:first-child'), what is being selected?

The first list item of every unordered list. Signup and view all the answers

What does the dblclick() method do in jQuery?

Attaches a function executed on double-clicking an HTML element. Signup and view all the answers

Which jQuery event is triggered when a user navigates away from an input field?

blur Signup and view all the answers

What is the purpose of the mouseenter() method?

Attaches a function activated when the mouse enters an HTML element. Signup and view all the answers

Which method should be used to attach multiple event handlers to the same element in jQuery?

hover() Signup and view all the answers

What is the function of the change event in forms?

Executed when the user makes a selection change in input fields. Signup and view all the answers

What does the mousedown() method do?

Triggers a function immediately when the mouse button is pressed down. Signup and view all the answers

Which jQuery method is utilized to focus on an input element?

focus() Signup and view all the answers

Which event is NOT considered a jQuery DOM event?

mousemove Signup and view all the answers

Study Notes

JavaScript - jQuery Examples (Lesson 1)

The presentation covers jQuery selectors and events, fundamental aspects of JavaScript interacting with HTML elements.
Learning objectives include understanding and using jQuery selectors and events.
jQuery selectors are crucial parts of the jQuery library for selecting and manipulating HTML elements.
They are used to find HTML elements based on various criteria: names, IDs, classes, types, attributes, and attribute values.
jQuery selectors are built upon existing CSS selectors, with additional custom selectors.
All jQuery selectors start with the dollar sign ()followedbyparentheses,e.g.,) followed by parentheses, e.g., )followedbyparentheses,e.g.,().
Basic jQuery syntax uses $(selector).action() to select HTML elements and perform actions on them
Examples of jQuery selectors include selecting all elements, the current HTML element, elements with specific IDs, classes, or attributes (e.g., href attributes).
Common actions include hiding elements, demonstrated through examples involving p elements with IDs or classes and any HTML element.
Core jQuery selectors allow you to search elements by ID (#id), class (class), the element itself (this), or any other criteria, ensuring accuracy and efficiency in targeted selection.
jQuery events allow a web page to respond to user actions like clicking, hovering, and focusing.

jQuery Events

jQuery events are actions web page visitors perform, such as mouse movements, button selections, and text box focus.
Examples of events include click, double-click, mouseenter, mouseleave, mousedown, mouseup, hover, focus, and blur.
jQuery provides various event methods for handling different types of events: click(), dblclick(), mouseenter(), mouseleave(), on() and more.
The hover() method combines mouseenter() and mouseleave() functions, triggering actions on mouse entry and exit.
The presentation provides specific code samples demonstrating how to handle these events on different HTML elements, such as p elements with specific attributes like id or class.

Additional Information

The presentation was for a class at Yeungjin University, following specific copyright guidelines for materials.
A reference to "Inyong Jeong(2018)" is referenced for further learning.

Studying That Suits You

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Description

Explore the foundational aspects of jQuery in this lesson. Discover how to effectively use jQuery selectors and events to manipulate HTML elements, enhancing your JavaScript skills. By the end, you will understand basic jQuery syntax and be able to perform actions on selected elements.

Week 14_Lesson 1

Choose a study mode

Podcast

Questions and Answers

Which jQuery selector would select all elements within a document?

The :first selector in jQuery selects the last element of a specified type.

What is the purpose of jQuery events?

The _____ selector selects all elements with a specific attribute.

Match the following jQuery selectors with their descriptions:

Which jQuery method is used to assign click events to all paragraphs?

The jQuery selector $('.className') selects elements by their unique id.

Write a jQuery code snippet to hide all elements with the class 'hidden'.

What does the selector $('p.intro') do?

$(':button') selects all button elements on a webpage.

What selector would you use to select the first child of every unordered list?

The selector $('______') selects all elements with a __________ attribute.

Which selector would hide all elements with class 'ps' when a button is clicked?

$('tr:odd') selects only the odd rows of a table.

What does the selector $('a[target!=_blank]') achieve?

Which of the following is a correct jQuery selector to hide an element with the id 'test'?

JQuery selectors start with the dollar sign followed by the selector inside parentheses.

What does the jQuery selector $('.test') do?

To hide all elements using jQuery, you would write: $_______('p').hide();

Match the jQuery selectors to their descriptions:

Which of the following selector types can be used to hide elements based on their class?

The jQuery syntax for a selector includes an action to be performed immediately after selecting an element.

Which jQuery method would you use to hide the current HTML element?

What is the basic syntax for selecting an HTML element and performing an action in jQuery?

Which selector would hide an HTML element with the id 'test'?

What does the jQuery selector $('p').hide() do?

What does the $(this).hide() selector do within an event handler?

Which of the following is a key characteristic of jQuery selectors?

How do jQuery selectors improve upon standard CSS selectors?

What is a valid way to select all elements with the class name 'test' in jQuery?

What does the jQuery action method do in the syntax $(selector).action()?

What does the selector $('p:first').hide() do?

Which jQuery selector would hide all elements with an id attribute when a button is clicked?

When using jQuery, which of the following correctly collects click events on all paragraphs?

What type of elements does the all selector $('*') hide?

Which statement about jQuery events is false?

Which jQuery code snippet hides all elements when a button is clicked?

What does the selector $([id]) refer to?

Which jQuery selector would hide the first element of a specific type such as ?

?

What is the purpose of the jQuery selector $('p:first')?

Which selector would you use to select all elements with a class of 'intro'?

What does the jQuery selector $('tr:even') achieve?

What will $('button').click(function() { $('#p1').hide(); }) do when executed?

Which jQuery selector is used to select elements based on their attribute value being not equal to a specified value?

What does the jQuery selector $(':button') select?

Which jQuery selector will select all elements that have an href attribute?

When using the jQuery selector $('ul li:first-child'), what is being selected?

What does the dblclick() method do in jQuery?

Which jQuery event is triggered when a user navigates away from an input field?

What is the purpose of the mouseenter() method?

Which method should be used to attach multiple event handlers to the same element in jQuery?

What is the function of the change event in forms?

What does the mousedown() method do?

Which jQuery method is utilized to focus on an input element?

Which event is NOT considered a jQuery DOM event?

Study Notes

JavaScript - jQuery Examples (Lesson 1)

jQuery Events

Additional Information

Studying That Suits You

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Week 11_Lesson 1

The selector $('') selects all elements with a ____ attribute.

To hide all
elements using jQuery, you would write: $_______('p').hide();

Which jQuery code snippet hides all
elements when a button is clicked?

Which jQuery selector would hide the first element of a specific type such as
?

Which selector would you use to select all
elements with a class of 'intro'?