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 (B)

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.

<p>[attribute]</p> Signup and view all the answers

Match the following jQuery selectors with their descriptions:

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

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

<p>$('p').click() (D)</p> Signup and view all the answers

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

<p>False (B)</p> Signup and view all the answers

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

<p>$('.hidden').hide();</p> Signup and view all the answers

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

<p>Selects all elements with class 'intro' (B)</p> Signup and view all the answers

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

<p>True (A)</p> Signup and view all the answers

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

<p>ul li:first-child</p> Signup and view all the answers

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

<p>href</p> Signup and view all the answers

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

<p>$('button').click(function() { $('.ps').hide(); }) (C)</p> Signup and view all the answers

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

<p>True (A)</p> Signup and view all the answers

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

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

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

<p>$('#test').hide() (C)</p> Signup and view all the answers

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

<p>True (A)</p> Signup and view all the answers

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

<p>It hides all elements with the class 'test'.</p> Signup and view all the answers

To hide all

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

<p>$</p> Signup and view all the answers

Match the jQuery selectors to their descriptions:

<p>$('#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</p> Signup and view all the answers

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

<p>Class Selector (A)</p> Signup and view all the answers

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

<p>True (A)</p> Signup and view all the answers

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

<p>$(this).hide()</p> Signup and view all the answers

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

<p>$().action() (D)</p> Signup and view all the answers

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

<p>$('#test').hide() (A)</p> Signup and view all the answers

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

<p>Hides all <p> elements (A)</p> Signup and view all the answers

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

<p>Hides the current HTML element that triggered the event (A)</p> Signup and view all the answers

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

<p>They can select elements based on attributes and values. (A)</p> Signup and view all the answers

How do jQuery selectors improve upon standard CSS selectors?

<p>They include custom selection capabilities. (A)</p> Signup and view all the answers

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

<p>$('.test').hide() (B)</p> Signup and view all the answers

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

<p>It performs an action on the selected elements. (B)</p> Signup and view all the answers

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

<p>Hides only the first <p> element on the page. (A)</p> Signup and view all the answers

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

<p>$(&quot;[id]&quot;).hide(); (C)</p> Signup and view all the answers

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

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

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

<p>All elements regardless of their type. (D)</p> Signup and view all the answers

Which statement about jQuery events is false?

<p>Events can only be triggered by mouse actions. (A)</p> Signup and view all the answers

Which jQuery code snippet hides all

elements when a button is clicked?

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

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

<p>All elements with an id attribute. (A)</p> Signup and view all the answers

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

?

<p>$('h1:first').hide(); (B)</p> Signup and view all the answers

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

<p>Selects the first <p> element only. (C)</p> Signup and view all the answers

Which selector would you use to select all

elements with a class of 'intro'?

<p>$('p.intro') (A)</p> Signup and view all the answers

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

<p>Selects all even-numbered <tr> elements. (C)</p> Signup and view all the answers

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

<p>Hide the <p> element with id 'p1' when a button is clicked. (C)</p> 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?

<p>$('a[target!=&quot;_blank&quot;]') (B)</p> Signup and view all the answers

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

<p>Selects all <button> elements and input elements of type 'button'. (A)</p> Signup and view all the answers

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

<p>$('[href]') (D)</p> Signup and view all the answers

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

<p>The first list item of every unordered list. (A)</p> Signup and view all the answers

What does the dblclick() method do in jQuery?

<p>Attaches a function executed on double-clicking an HTML element. (B)</p> Signup and view all the answers

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

<p>blur (A)</p> Signup and view all the answers

What is the purpose of the mouseenter() method?

<p>Attaches a function activated when the mouse enters an HTML element. (D)</p> Signup and view all the answers

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

<p>hover() (D)</p> Signup and view all the answers

What is the function of the change event in forms?

<p>Executed when the user makes a selection change in input fields. (A)</p> Signup and view all the answers

What does the mousedown() method do?

<p>Triggers a function immediately when the mouse button is pressed down. (D)</p> Signup and view all the answers

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

<p>focus() (C)</p> Signup and view all the answers

Which event is NOT considered a jQuery DOM event?

<p>mousemove (C)</p> Signup and view all the answers

Flashcards

jQuery Selector

A way to target specific HTML elements in jQuery to operate on those elements.

jQuery Event

An action performed by a user on a webpage, like clicking a button or hovering over an element.

all selector

Selects every element on the page.

first selector

Selects only the very first element.

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attribute selector

Selects elements that have a specific attribute.

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click event

A specific event triggered when a user clicks on an element.

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jQuery syntax for events

Allows controlling the webpage's behavior in response to user actions.

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jQuery .hide()

Hides selected HTML element(s).

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Selecting all elements

The jQuery selector * targets all HTML elements on a webpage.

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Selecting current element

The jQuery selector $(this) targets the current element in an event handler function.

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Class selector

The jQuery selector p.intro targets elements with the class 'intro'.

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Attribute Value selector

The jQuery selector a[target='_blank'] targets elements with the 'target' attribute set to '_blank'.

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Type selector

The jQuery selector :button targets buttons.

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jQuery Selector Syntax

The way to write jQuery selectors, using the dollar sign ($) and parentheses.

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jQuery selector example

Selecting HTML elements using jQuery selector syntax.

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$("p").hide()

Hides all paragraph elements (

).

in the HTML document.

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$("#test").hide()

Hides the HTML element with the ID "test".

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$(".test").hide()

Hides all HTML elements with the class "test".

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$(this).hide()

Hides the currently selected HTML element.

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Basic Syntax

The fundamental structure of jQuery for selecting elements and performing actions: $(selector).action()

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What is the purpose of jQuery Selectors?

They are used to find or select specific HTML elements on a web page based on criteria like their ID, class, or type, enabling you to apply actions to them.

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How do jQuery Selectors work?

They use a syntax based on CSS selectors, but with added features from jQuery. It's a flexible way to identify elements using a variety of criteria.

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What is the purpose of the dollar sign ($) in jQuery?

It's the symbol used to designate and access the jQuery library. It's essential for using any jQuery functionality.

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What does '$(selector)' mean in jQuery syntax?

This part represents the selection of specific HTML elements based on the criteria specified within the 'selector'.

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'action()' in jQuery Syntax

This component defines the action you want to perform on the selected HTML elements. It can be hiding, showing, modifying, or any other function supported by jQuery.

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What does * select?

The * selector in jQuery selects every single HTML element on the page. It's a wildcard that matches everything.

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What does $(this) select?

The $(this) selector refers to the current HTML element that triggered an event, like a click. It's very useful for handling individual element events.

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How do you select elements by class?

You use a period (.) followed by the class name. For example, $('.intro') selects all elements with the class 'intro'.

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How do you select elements by attribute?

You use square brackets ([]) with the attribute name and optional value. For example, $('a[target='_blank']') selects all anchor elements with the 'target' attribute set to '_blank'.

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What are :even and :odd selectors?

These selectors select every other row. :even selects even rows, while :odd selects odd rows. This is great for visual effects like alternating row colors.

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How do you hide elements with jQuery?

You can use .hide() method after selecting the desired element. For example, $('#p1').hide() will hide the element with the ID 'p1'.

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What does $(document).ready(function(){...}) do?

This line of code ensures that your jQuery script will only run after the entire HTML document has finished loading. It's important to avoid errors caused by scripts trying to work with elements that aren't fully loaded yet.

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jQuery Event Syntax

The standard way to write code to handle events in jQuery. It involves selecting an element, specifying the event, and providing a function to execute when that event happens.

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jQuery click() Event

Executes a function when a user clicks on an element. It's used to make specific elements interactive.

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jQuery hide() Method

Hides selected HTML elements from view on a page. It's used to control the visibility of elements dynamically.

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jQuery $(document).ready()

Ensures that a code snippet runs after the entire HTML document has been completely loaded. This ensures that the elements you're trying to manipulate actually exist on the page.

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jQuery * Selector

A universal selector that selects every element on a webpage. It's used to apply changes to all elements.

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jQuery :first Selector

Targets the first element in a group of elements, regardless of their type. It's useful for working with the initial element in a set.

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mouseenter Event

The mouseenter event is triggered when a user moves the mouse pointer over an HTML element.

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mouseleave Event

The mouseleave event is triggered when a user moves the mouse pointer out of an HTML element.

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mousedown Event

The mousedown event is triggered when a user presses a mouse button down while the pointer is over an HTML element.

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mouseup Event

The mouseup event is triggered when a user releases a mouse button that was previously pressed down while the pointer is over an HTML element.

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hover Event

The hover event is triggered when the mouse pointer moves over an HTML element and then away from it, creating a hover effect.

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jQuery .click() Function

The .click() function in jQuery is used to attach an event handler to an HTML element that will be executed whenever the element is clicked by the user.

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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.

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