Week 14_Lesson 2
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Questions and Answers

Which method is used to insert content before a selected HTML element?

  • after()
  • empty()
  • before() (correct)
  • append()

    • The jQuery empty() method removes all elements, including child elements, from the selected element.

    False

    What is the purpose of the jQuery remove() method?

    To remove the selected element(s) and their child elements.

    The jQuery method used to add one or more class names to selected elements is called __________.

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

    Match the jQuery methods with their respective functions:

    <p>addClass() = Adds a class to selected elements removeClass() = Removes a class from selected elements toggleClass() = Toggles a class on and off for selected elements css() = Sets or returns style properties for selected elements</p> Signup and view all the answers

    Which jQuery method would you use to remove all child elements of a selected element?

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

    The jQuery after() method inserts content before the selected HTML elements.

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

    What does the toggleClass() method do in jQuery?

    <p>It toggles between adding and removing one or more classes from selected elements.</p> Signup and view all the answers

    What does the jQuery attr() method do?

    <p>It returns the value of an attribute.</p> Signup and view all the answers

    The remove() method in jQuery only removes the content of the selected elements.

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

    What jQuery method would you use to add content at the beginning of a selected element?

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

    The jQuery method that adds content after the selected elements is called __________.

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

    When you use the jQuery append() method, where is the new content added?

    <p>At the end of the selected elements</p> Signup and view all the answers

    The empty() method in jQuery removes all attributes of selected elements.

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

    In the provided jQuery example, which button is used to append an item to a list?

    <p>btn2</p> Signup and view all the answers

    What does the jQuery addClass() method do?

    <p>Adds a class to selected elements</p> Signup and view all the answers

    The removeClass() method can be used to add a class to selected elements.

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

    What is the purpose of the toggleClass() method in jQuery?

    <p>It toggles between adding and removing classes from selected elements.</p> Signup and view all the answers

    The jQuery method used to set or return style properties is called ______.

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

    Match the jQuery methods with their corresponding functions:

    <p>addClass = Adds class attributes to elements removeClass = Removes class attributes from elements toggleClass = Adds or removes class attributes depending on their current state css = Sets or retrieves style properties of elements</p> Signup and view all the answers

    Which statement correctly describes how the css() method is utilized?

    <p>It can set or get multiple style properties for selected elements.</p> Signup and view all the answers

    Classes can be added to multiple elements simultaneously using jQuery.

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

    What happens when a button is clicked in the example with the toggleClass() method?

    <p>The class 'blue' is either added or removed from the selected elements.</p> Signup and view all the answers

    What does the jQuery text() method do when setting content for a paragraph element?

    <p>Replaces the text content of the selected elements.</p> Signup and view all the answers

    In the context of jQuery, what will the html() method return for a paragraph element?

    <p>The inner HTML content including all HTML tags.</p> Signup and view all the answers

    When using the jQuery val() method to set a value, what will happen to an input field?

    <p>It sets the value of the input field to a specified string.</p> Signup and view all the answers

    What will happen when the button is clicked in the example using the alert($(‘p’).text()); statement?

    <p>The alert will show the combined text from all paragraphs.</p> Signup and view all the answers

    Which method can be used to change the HTML content of all selected elements to 'Hello world!'?

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

    When using jQuery, which method would retrieve the value from a text input field when a button is clicked?

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

    What is the result of executing $(‘p’).html('Hello world!') on a paragraph element?

    <p>The inner HTML of the paragraph will be replaced with 'Hello world!'.</p> Signup and view all the answers

    What does the jQuery hide() method do?

    <p>Hides the selected elements</p> Signup and view all the answers

    Which jQuery method is used to toggle visibility of elements?

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

    What does the fadeIn() method accomplish in jQuery?

    <p>Fades in the selected elements</p> Signup and view all the answers

    How does the fadeToggle() method function?

    <p>Toggles between fading in and fading out</p> Signup and view all the answers

    In the toggle() function example, what JavaScript event is most likely associated with the button?

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

    Which of the following correctly describes what the jQuery show() method does?

    <p>Reveals the selected elements that were hidden</p> Signup and view all the answers

    What is required for the toggle() method to work as demonstrated in the example?

    <p>The document must be in a ready state</p> Signup and view all the answers

    What parameters can be passed to the hide() method to control its action?

    <p>A number to specify duration</p> Signup and view all the answers

    What is the outcome of using the jQuery remove() method?

    <p>It removes the selected element and its child elements.</p> Signup and view all the answers

    What effect does the jQuery empty() method have on selected elements?

    <p>It removes all child elements of the selected element.</p> Signup and view all the answers

    Which jQuery method would you use to add a new class to an existing element?

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

    In jQuery, what is the function of the toggleClass() method?

    <p>It toggles between adding and removing one or more classes from elements.</p> Signup and view all the answers

    What happens if you attempt to use the jQuery css() method without parameters?

    <p>It will return the current CSS properties of the selected elements.</p> Signup and view all the answers

    Which statement accurately describes the jQuery before() method?

    <p>It inserts content before the selected HTML elements.</p> Signup and view all the answers

    If you use the removeClass() method on an element with multiple classes, what will occur?

    <p>Only one specified class will be removed, leaving the others intact.</p> Signup and view all the answers

    What is the purpose of the jQuery css() method in the context given?

    <p>To set or return the value of a specified CSS property for matched elements.</p> Signup and view all the answers

    Which of the following correctly demonstrates setting the background color of a paragraph to yellow using jQuery?

    <p>$('p').css('background-color', 'yellow');</p> Signup and view all the answers

    What will happen when the button is clicked in the given jQuery example that uses the css() method to return a CSS property?

    <p>An alert will display the background color of all paragraphs.</p> Signup and view all the answers

    Which method would not be used to manipulate CSS styles in jQuery from the options provided?

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

    What is the expected outcome of the jQuery code that alerts the background color of a paragraph when the button is clicked?

    <p>It will return the color in RGB format.</p> Signup and view all the answers

    What does the jQuery addClass() method do when executed in the provided example?

    <p>It adds class attributes to selected elements.</p> Signup and view all the answers

    In the example of the jQuery removeClass() method, which elements are affected when the button is clicked?

    <p>All elements matching the selector <code>h1, h2, p</code>.</p> Signup and view all the answers

    What is the primary function of the jQuery toggleClass() method?

    <p>It alternates between adding and removing specified classes.</p> Signup and view all the answers

    When the jQuery css() method is used, what can be accomplished?

    <p>It can set or return one or more style properties for selected elements.</p> Signup and view all the answers

    Which jQuery method allows for adding classes to multiple elements at once?

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

    What happens when the given jQuery code runs on a button click regarding <h1>, <h2>, and <p> elements with the addClass() method?

    <p>They will have the class 'blue' added to them.</p> Signup and view all the answers

    In what situation would you use the removeClass() method in jQuery?

    <p>To clear a specific class attribute from selected elements.</p> Signup and view all the answers

    If you wanted to switch the class of selected elements to 'important', which method would you use?

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

    What does the jQuery attr() method do when used with a single argument?

    <p>It retrieves the value of the selected element's attribute.</p> Signup and view all the answers

    Which jQuery method would you use to add content to the end of selected elements?

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

    What is the effect of using the jQuery remove() method?

    <p>It removes the selected elements along with their data and events.</p> Signup and view all the answers

    Which statement about the jQuery empty() method is true?

    <p>It removes all child nodes and content from the selected elements.</p> Signup and view all the answers

    How would you set the width attribute of an image using jQuery?

    <p>img.attr('width', '500')</p> Signup and view all the answers

    What does the jQuery prepend() method do?

    <p>Inserts content at the beginning of the selected elements.</p> Signup and view all the answers

    Which jQuery method can be used to clear all content from a selected element without removing the element itself?

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

    When the jQuery after() method is used, what happens to the selected elements?

    <p>Content is added after each of the selected elements.</p> Signup and view all the answers

    What will the jQuery text() method do when called on a paragraph element?

    <p>Set the text content of the paragraph element</p> Signup and view all the answers

    Study Notes

    JavaScript with jQuery Examples

    • This presentation covers JavaScript and jQuery examples, specifically focusing on jQuery effects and HTML/CSS methods.
    • The material is intended for educational use at Yeungjin University.
    • External use is prohibited due to copyright restrictions.

    Learning Content and Objectives

    • Learning Contents: jQuery Effect Methods, jQuery HTML&CSS Methods
    • Learning Objectives: Understand and use jQuery Effect Methods. Understand and use jQuery HTML&CSS Methods.

    jQuery Effect Methods (1)

    • jQuery Hide and Show Methods:
      • hide(): Hides selected elements.
      • show(): Shows selected elements.
      • toggle(): Toggles between hiding and showing selected elements.

    jQuery Effect Methods (2)

    • Example of hide()/show() Methods:
      • The example includes JavaScript code demonstrating the hide() method and speed parameter. This code hides a paragraph element with a specified duration.
      • The example includes buttons, to hide and show specific elements via JQuery.

    jQuery Effect Methods (3)

    • Example of toggle() Methods:
      • The example demonstrates how jQuery can be used to toggle elements between visibility states. This example demonstrates how to show and hide elements using the toggle() function.

    jQuery Fade Methods (1)

    • Description of jQuery Fade Methods: Lists jQuery methods for creating animation effects.
      • fadeIn(): Fades elements in (opacity transitions)
      • fadeOut(): Fades elements out.
      • fadeTo(): Fades elements to a specified opacity.
      • fadeToggle(): Toggles between fadeIn() and fadeOut().

    jQuery Fade Methods (2)

    • Example of fadeIn(): Illustrates the usage of the fadeIn() method with different speed parameters. This code demonstrates how to fade-in elements using jQuery with various time durations.

    jQuery Fade Methods (3)

    • Example of fadeOut(): Demonstrates the usage of the fadeOut() method with different speed parameters. This example shows the use of fadeOut() to fade elements out.

    jQuery Fade Methods (4)

    • Example of fadeToggle(): Demonstrates fadeToggle with different speed parameters. This example shows the use of fadeToggle to toggle the visibility of elements by fading them in and out.

    jQuery Slide Methods (1)

    • jQuery Slide Methods:
      • slideDown(): Slides elements down.
      • slideUp(): Slides elements up.
      • slideToggle(): Toggles between slideDown() and slideUp().

    jQuery Slide Methods (2)

    • Example of slideDown() Method: This example demonstrates how to use the slideDown() method with an animation speed, to create a sliding effect as the element slides-down.

    jQuery Slide Methods (3)

    • Example of slideUp() Method: Demonstrates the slideUp() method with a speed parameter to show a sliding up element animation.

    jQuery Slide Methods (4)

    • Example of slideToggle() Method: Demonstrates the slideToggle() method with a speed parameter.

    jQuery Animate and Stop Methods (1)

    • Description of jQuery Animate and Stop Methods:
      • animate(): Runs a customized animation.
      • stop(): Stops any running animation.

    jQuery Animate and Stop Methods (2)

    • Example of jQuery animate(): Illustrates animating multiple properties simultaneously (e.g., position, opacity, size) using the animate method. Demonstrates animation of changes to properties of an element such as color, size, opacity etc.

    jQuery Animate and Stop Methods (3)

    • Example of Stop() Method: Demonstrates the stop() method, without parameters, to interrupt any active animation. Shows how an animation can be halted with jQuery.

    jQuery HTML&CSS Methods (1)

    • Get and Set Content and Attributes:
      • Lists and describes methods to manage HTML and CSS elements and content.
      • text(): Retrieves or sets text content.
      • html(): Retrieves or sets HTML content.
      • val(): Retrieves or sets values of input elements.
      • attr(): Sets or returns attributes.

    jQuery HTML&CSS Methods (2)

    • Example of text() Method: Example showing retrieving text content of elements.

    jQuery HTML&CSS Methods (3)

    • Example of text() Method: Example showing setting text content of elements.

    jQuery HTML&CSS Methods (4)

    • Example of html() Method: Returns HTML content of an element

    jQuery HTML&CSS Methods (5)

    • Example of html() method: Shows how to set HTML content of specified elements

    jQuery HTML&CSS Methods (6)

    • Example of jQuery val() Method: Return the value attribute value. Illustrates retrieving input values using JQuery.

    jQuery HTML&CSS Methods (7)

    • Example of jQuery val() Method: Shows how to set the values of a text input using jQuery

    jQuery HTML&CSS Methods (8)

    • Example of jQuery attr() Method: Demonstrates returning values from specified attributes using JQuery in cases where value is not in an inputfield.

    jQuery HTML&CSS Methods (9)

    • Example of jQuery attr() Method: Shows how to set attributes using jQuery

    jQuery Add and Remove Elements (1)

    • jQuery Add and Remove Elements:
      • append(): Inserts content at the end of elements.
      • prepend(): Inserts content at the beginning.
      • after(): Inserts after an element.
      • before(): Inserts before an element
      • remove(): Removes elements.
      • empty(): Removes child elements.

    jQuery Add and Remove Elements (2)

    • Example of append(): Illustrates appending content to the end of HTML elements.

    jQuery Add and Remove Elements (3)

    • Example of append(): Inserts HTML-Elements to the end of HTML-Elements.

    jQuery Add and Remove Elements (4)

    • Example of prepend(): Illustrates placing content at the beginning of existing HTML elements.

    jQuery Add and Remove Elements (5)

    • Example of prepend(): Example of inserting specified HTML content to the starting of HTML elements.

    jQuery Add and Remove Elements (6)

    • Example of before(): Demonstrates inserting content before specified HTML Elements

    jQuery Add and Remove Elements (7)

    • Example of after(): Example and uses of the after() method for inserting content after specified elements.

    jQuery Add and Remove Elements (8)

    • Example of remove(): Removes selected elements

    jQuery Add and Remove Elements (9)

    • Example of empty(): Removes children from the specified HTML elements.

    jQuery Get and Set CSS Classes (1)

    • jQuery Get and Set CSS Classes: Describes methods for manipulating CSS classes.
      • addClass(): Adds class(es) to selected elements
      • removeClass(): Removes class(es)
      • toggleClass(): Toggles class(es)
      • css(): Sets or retrieves CSS styles.

    jQuery Get and Set CSS Classes (2)

    • Example Stylesheet: Provides a stylesheet containing the CSS classes that will be referenced in subsequent examples.

    jQuery Get and Set CSS Classes (3)

    • Example of addClass(): Shows adding class attributes to different multiple elements.

    jQuery Get and Set CSS Classes (4)

    • Example of removeClass(): Demonstrates removing specific class attributes from different elements

    jQuery Get and Set CSS Classes (5)

    • Example of toggleClass(): Illustrates how toggleClass can add or remove classes to selected items.

    jQuery Get and Set CSS Classes (6)

    • Example of css() Method: Shows how to return specific CSS properties for different HTML elements.

    jQuery Get and Set CSS Classes (7)

    • Example of css() Method: Illustrates how using the css() method can change CSS properties across elements.

    Learning Summary

    • jQuery Effect Methods: Summary of the usage of jQuery hide()/show(), fadeIn()/fadeOut(), and slideUp()/slideDown() for manipulating visibility and animation.
    • jQuery HTML&CSS Methods: Summary of how jQuery enables manipulation of HTML/CSS content, attributes, and values

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