JavaScript with jQuery Overview

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Questions and Answers

What does the hide() method do in jQuery?

  • Hides the selected elements (correct)
  • Shows the selected elements
  • Toggles selected elements
  • Fades out the selected elements

The toggle() method shows and hides selected elements randomly.

False (B)

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

Fades in the selected elements

The method used to fade out selected elements is called ______.

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

Match the jQuery methods with their descriptions:

<p>hide() = Hides the selected elements show() = Shows the selected elements fadeToggle() = Toggles between fadeIn() and fadeOut() toggle() = Toggles between hide() and show()</p> Signup and view all the answers

Which jQuery method can be used to animate to a specific opacity level?

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

The method fadeToggle() can only be used with paragraphs.

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

What is the result when the show() method is called?

<p>It makes the selected elements visible.</p> Signup and view all the answers

Which jQuery method is used to hide an element by sliding it up?

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

The slideToggle() method in jQuery is used to hide an element only.

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

What event is triggered when the element with ID 'flip' is clicked?

<p>A slide action (down, up, or toggle) is triggered on the '#panel' element.</p> Signup and view all the answers

The jQuery method used to display an hidden element is called ______.

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

Match the jQuery method to its function:

<p>slideUp() = Hides an element by sliding it up slideDown() = Reveals an element by sliding it down slideToggle() = Toggles the visibility of an element with sliding motion fadeOut() = Gradually hides an element by fading it out</p> Signup and view all the answers

What CSS property is used to set the padding for the panel and flip elements?

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

The #panel is set to be visible by default in the provided code.

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

What is the default display state of the #panel element?

<p>none</p> Signup and view all the answers

What method is used to set the background color of all matched elements in jQuery?

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

The jQuery fadeOut() method can be used to make an element visible.

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

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

<p>To set or return attributes and values of the selected elements.</p> Signup and view all the answers

The jQuery method used to hide HTML elements is called __________.

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

Match the following jQuery methods with their functionalities:

<p>css() = Get or set CSS properties text() = Set or return text content html() = Set or return HTML content animate() = Create custom animations</p> Signup and view all the answers

What does the jQuery after() method do?

<p>Inserts content after the selected elements (B)</p> Signup and view all the answers

The jQuery remove() method only removes the selected elements but keeps their child elements.

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

The jQuery __ method adds one or more class names to selected elements.

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

Which jQuery method is used to manipulate the style properties of elements?

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

The toggleClass() method can only add classes to an element, not remove them.

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

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

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

The fadeOut() method can only be called with the default speed setting.

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

Name one jQuery method that can be used to hide elements.

<p>fadeOut() or slideUp()</p> Signup and view all the answers

The method _______ combines the effects of fadeIn and fadeOut.

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

Which jQuery method is used to show selected elements by sliding them down?

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

The slideToggle() method can only be used with elements that are already visible.

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

What is the effect of the slideUp() method?

<p>The slideUp() method hides the selected elements by sliding them upwards.</p> Signup and view all the answers

What does the jQuery method text() do when used to set content?

<p>Sets the plain text content of an element (D)</p> Signup and view all the answers

The jQuery method html() can be used to retrieve the inner HTML of an element.

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

What is the result of using the val() method on an input field?

<p>It retrieves or sets the value attribute of the input field.</p> Signup and view all the answers

To change the HTML content of a paragraph, you would use the ________ method.

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

What happens when you click the button associated with the text() method?

<p>The paragraph's text is changed to 'Hello world!' (A)</p> Signup and view all the answers

The alert() function can display both plain text and HTML content.

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

The function $(document).ready(function() {...}) ensures the code runs when the ________ is loaded.

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

How do you retrieve the background color of a

element using jQuery?

<p>Use $('p').css('background-color') (A)</p> Signup and view all the answers

What is the effect of the following jQuery code: $('p').css('background-color', 'yellow');?

<p>It sets the background color of all <p> elements to yellow. (C)</p> Signup and view all the answers

What does the jQuery fadeTo() method do?

<p>Fades selected elements to a specified opacity level (C)</p> Signup and view all the answers

Which jQuery method is used to manipulate CSS properties of selected elements?

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

Which jQuery method would you use to toggle the visibility of elements?

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

Which of the following describes the fadeOut() method?

<p>It makes elements gradually disappear. (D)</p> Signup and view all the answers

Which statement accurately describes the jQuery method .animate()?

<p>It combines multiple CSS property animations into one. (D)</p> Signup and view all the answers

When using the show() method, what happens to the hidden elements?

<p>They become visible immediately. (B)</p> Signup and view all the answers

What is the effect of the jQuery fadeToggle() method?

<p>Fades elements in and out based on their current state. (D)</p> Signup and view all the answers

In jQuery, what is likely the result of using the hide(1000) method?

<p>The element will fade out over a 1-second duration. (B)</p> Signup and view all the answers

What feature does the fadeIn() method provide in jQuery?

<p>Gradually makes selected elements visible. (C)</p> Signup and view all the answers

What will be the result of clicking a button that has a jQuery event listener for the toggle() method?

<p>Hidden paragraphs will be displayed, while shown ones will be hidden. (A)</p> Signup and view all the answers

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

<p>To hide an element by sliding it up (D)</p> Signup and view all the answers

Which method would you use to both show and hide an element on click?

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

What visual effect is produced by the slideDown() method?

<p>An element slides down into view (D)</p> Signup and view all the answers

What CSS property is modified to give the #panel a padding of 50px?

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

What jQuery function ensures that the DOM is fully loaded before executing the code inside it?

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

Which method is invoked when the element with ID 'flip' is clicked?

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

What does the CSS rule display: none; accomplish for the #panel element?

<p>It completely hides the element from view (A)</p> Signup and view all the answers

In the context of the example, what will happen when the #flip element is clicked if the panel is visible?

<p>The panel will slide up and become hidden (A)</p> Signup and view all the answers

What does the jQuery addClass() method do?

<p>Adds class attributes to selected elements (C)</p> Signup and view all the answers

What will happen when the jQuery removeClass() method is executed on selected elements?

<p>It removes the specified class from the elements (D)</p> Signup and view all the answers

Which method is used to toggle a class in jQuery?

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

In which scenario would you use the jQuery css() method?

<p>To change the style properties of selected elements (B)</p> Signup and view all the answers

What happens to the class 'blue' when the removeClass() method is applied?

<p>It removes only the class 'blue' from selected elements (A)</p> Signup and view all the answers

What function does the toggleClass() method serve in jQuery?

<p>It adds a specified class only if it does not exist, otherwise it removes it (C)</p> Signup and view all the answers

When using jQuery, what will occur when clicking the button linked to the toggleClass('blue') function?

<p>The blue class will be toggled on and off for the selected elements (D)</p> Signup and view all the answers

Which of the following is a correct outcome of using the css() method in jQuery?

<p>It can set or return multiple style properties (A)</p> Signup and view all the answers

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

<p>Replaces the text content of the paragraph with specified text. (D)</p> Signup and view all the answers

Which jQuery method is used to retrieve the inner HTML of a paragraph element?

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

What will be the output of the val() method when used without any parameters?

<p>Retrieves the current value of the selected input field. (C)</p> Signup and view all the answers

When the html() method is used to set content, what happens to the previous content of the selected element?

<p>The previous content is replaced with new content. (C)</p> Signup and view all the answers

What trigger occurs when a button associated with the text() method is clicked?

<p>The text of the paragraph is updated to a predetermined string. (C)</p> Signup and view all the answers

In jQuery, what does the val() method do when setting a value?

<p>Changes the value of the input field to a static string. (D)</p> Signup and view all the answers

Which method would you use to manipulate the HTML content of an element?

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

Which statement is true regarding the $(document).ready() function?

<p>It ensures that the jQuery code runs only when the DOM is fully loaded. (D)</p> Signup and view all the answers

What does the jQuery attr() method do when used to set an attribute?

<p>It modifies an existing attribute to a new value. (A)</p> Signup and view all the answers

Which jQuery method is used to insert content at the beginning of selected elements?

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

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

<p>It removes the selected elements and their associated events. (C)</p> Signup and view all the answers

When using the jQuery empty() method, what is the outcome?

<p>It sets the content of the selected elements to an empty string. (B)</p> Signup and view all the answers

Which of the following methods would you use to add content after a selected element?

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

What happens when you call the jQuery attr() method on an image element with the width attribute set?

<p>It retrieves the current width value of the image. (D)</p> Signup and view all the answers

To insert content before a selected element in jQuery, which method is appropriate?

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

Flashcards

jQuery hide()

Hides the selected HTML elements.

jQuery show()

Shows the selected HTML elements that were previously hidden.

jQuery toggle()

Toggles visibility of selected elements (show/hide).

jQuery fadeIn()

Gradually appears, fades in the selected HTML elements.

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jQuery fadeOut()

Gradually disappears, fades out the selected HTML elements.

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jQuery fadeTo()

Fades the selected elements to a specified opacity.

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jQuery fadeToggle()

Toggles between fadeIn() and fadeOut() methods for selected elements.

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jQuery effect methods

Used to add animated transitions to HTML elements.

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jQuery slideDown()

Makes an element slide down (from hidden to visible).

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jQuery slideUp()

Makes an element slide up (from visible to hidden).

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jQuery fade methods

jQuery methods for fading in or out elements.

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slideUp()

A jQuery method that animates an element to slide upwards and hide itself. The element's height is reduced smoothly to zero.

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slideDown()

A jQuery method that animates an element to slide downwards and reveal itself. The element's height is increased smoothly from zero to its original height.

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slideToggle()

A jQuery method that animates an element to slide either up or down depending on its current state. If the element is visible, it slides up and hides, and if it's hidden, it slides down and shows.

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jQuery slideUp() Animation

A jQuery method used to create an animated effect where an element smoothly slides upwards and disappears from view. Its height is reduced to zero over a specified duration.

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jQuery slideDown() Animation

A jQuery method used to create an animated effect where an element smoothly slides downwards and appears from view. Its height increases to its original value over a specified duration.

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jQuery slideToggle() Animation

A jQuery method used to create an animated effect where an element smoothly slides up or down based on its current state. If it's visible, it slides up, if it's hidden, it slides down.

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jQuery before()

Inserts content BEFORE the selected HTML elements.

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jQuery after()

Inserts content AFTER the selected HTML elements.

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jQuery remove()

Removes the selected element(s) and its child elements.

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jQuery empty()

Removes the child elements of the selected element(s).

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jQuery addClass()

Adds one or more class names to selected elements.

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jQuery removeClass()

Removes one or more classes from selected elements.

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jQuery toggleClass()

Toggles between adding/removing one or more classes from selected elements.

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jQuery css()

Sets or returns one or more style properties for selected elements.

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jQuery text() method

Retrieves or sets the plain text content of selected HTML elements.

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jQuery html() method

Retrieves or sets the HTML content of selected HTML elements.

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jQuery val() method

Retrieves or sets the 'value' attribute of form elements, like input fields.

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jQuery text() to get content

Retrieves the plain text content of selected elements without HTML tags.

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jQuery text() to set content

Sets the plain text content of selected elements, replacing any existing content.

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jQuery html() to get content

Retrieves the HTML content of selected elements, including all HTML tags.

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jQuery html() to set content

Sets the HTML content of selected elements, replacing any existing content.

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jQuery val() to get value

Retrieves the value attribute of form elements, such as input fields.

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jQuery css() to set properties

The jQuery css() method can be used to set the value of a CSS property for all matched elements. You pass the property name and the desired value to the method.

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jQuery css() to get properties

The jQuery css() method can also be used to get the current value of a CSS property for selected elements. Simply pass the property name as an argument to the method.

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Retrieve content with jQuery

The jQuery text(), html(), and val() methods are used to get the content of selected elements. text() retrieves plain text, html() gets the HTML code, and val() gets the value attribute of form elements.

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Set content with jQuery

The jQuery text(), html(), and val() methods can also be utilized to set the content of selected elements. text() replaces the text content, html() replaces the entire HTML code, and val() updates the value of a form element.

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jQuery text() for plain text

The jQuery text() method is used to retrieve the plain text content of selected elements. It strips away any HTML tags, leaving only the text itself.

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jQuery html() for full HTML

The jQuery html() method retrieves the HTML content of selected elements. It includes all HTML tags within the content, providing the full structure.

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jQuery val() for form elements

The jQuery val() method is specifically designed to interact with form elements like input fields, text areas, and select elements (dropdowns). It retrieves or sets the value attribute of these elements. This attribute represents the current value of the form element, such as user input in a text box or the selected option in a dropdown.

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jQuery append()

Inserts content at the end of selected elements.

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jQuery prepend()

Inserts content at the beginning of selected elements.

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Get an attribute

Use attr() method with the attribute name as an argument to retrieve the value of an attribute from a selected element.

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Set an attribute

Use attr() method with the attribute name and its new value to change the attribute of a selected element.

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addClass()

Adds one or more class names to selected elements. This is used to apply styles defined in a CSS stylesheet.

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removeClass()

Removes one or more class names from selected elements, removing any associated styles.

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toggleClass()

Toggles between adding and removing one or more class names from selected elements. This is used to control the appearance of an element dynamically.

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css() to set properties

Sets one or more style properties for selected elements. This allows you to adjust the visual appearance of an element, such as its color or font size.

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css() to get properties

Returns the current value of one or more style properties for the selected elements. This is useful for checking how an element is currently styled.

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jQuery Get and Set CSS Classes

jQuery provides methods for adding, removing, and toggling CSS classes on HTML elements, allowing you to dynamically change their appearance.

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Why use jQuery for CSS classes?

jQuery allows you to control CSS classes more efficiently than pure JavaScript. It provides a simple and consistent way to work with classes for multiple elements at once, making your code cleaner and easier to maintain.

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What's the difference between addClass() and css()?

addClass() adds or removes predefined CSS classes, while css() allows you to directly set or modify individual CSS properties. addClass() applies defined styles based on the class name, while css() lets you directly style elements.

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What does jQuery's css() method do?

The css() method in jQuery allows you to both get and set the value of CSS properties for selected HTML elements. You can retrieve the current value of a property or apply a new value to style elements.

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How do you use css() to get a CSS property?

To get the value of a CSS property using jQuery's css() method, pass the property name as an argument within parentheses. For example, $('p').css('background-color') will retrieve the background-color property value of all <p> elements.

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How do you use css() to set a CSS property?

To set a CSS property using jQuery's css() method, pass the property name as the first argument and the desired value as the second argument. For example, $('p').css('background-color', 'yellow') will set the background color of all <p> elements to yellow.

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

The $(document).ready(function(){...}) code ensures that your jQuery code is executed only after the entire HTML document has finished loading. This prevents errors that might occur if you try to manipulate elements that haven't finished loading yet.

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Why is "button").click(function(){...}) used?

The "button").click(function(){...}) code attaches an event handler to a button. This means that whenever the button is clicked, the code inside the function() will be executed. This is a common way to trigger actions in response to user interaction.

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What is the purpose of jQuery Slide Methods?

jQuery Slide Methods are used to create animated transitions where elements smoothly slide into or out of view. These methods provide a visually appealing and engaging way to manipulate the visibility of elements on a web page.

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How does jQuery slideUp() work?

jQuery slideUp() gradually reduces an element's height to zero. It effectively hides the element by making it slide up from its original position, creating a visually smooth and controlled disappearance effect.

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How does jQuery slideDown() work?

jQuery slideDown() increases the height of an element from zero to its original height. It reveals the element by making it slide down from its hidden state, creating a smoothly appearing effect.

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How does jQuery slideToggle() work?

jQuery slideToggle() toggles the visibility of an element based on its current state. If it's visible, it slides up and hides, and if it's hidden, it slides down and reveals itself.

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Give an example of a jQuery Slide Method

An example of a jQuery Slide Method is slideUp(), which causes an element to slide upwards and disappear smoothly. This method is often used to create a visually appealing animation when hiding elements on a website.

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Study Notes

JavaScript with jQuery

  • This presentation covers JavaScript and jQuery examples.
  • The course is at Yeungjin University.
  • The content focuses on jQuery Effect Methods and jQuery HTML&CSS Methods.
  • Learning objectives include explaining and using jQuery Effect and HTML&CSS methods.

jQuery Effect Methods

  • Hide and Show Methods:

    • hide(): Hides selected elements.
    • show(): Displays selected elements.
    • toggle(): Alternates between hiding and showing selected elements.
    • Included are examples of using the hide(), show(), and toggle() methods and demonstrating the speed parameter. Examples are included.
  • Fade Methods:

    • fadeIn(): Gradually shows elements.
    • fadeOut(): Gradually hides elements.
    • fadeTo(): Fades elements to a specified opacity.
    • fadeToggle(): Alternates between fadeIn() and fadeOut().
    • Shows how to fade elements in with different speed parameters, demonstrating different parameters. Includes specific examples with code.
  • Slide Methods:

    • slideDown(): Slides elements down.
    • slideUp(): Slides elements up.
    • slideToggle(): Alternates between sliding up and down.
    • Demonstrates slideDown(), slideUp(), and slideToggle() with examples, including code showing how to use these features.

jQuery Animate and Stop Method

  • animate(): Used for custom animations on selected elements, animating multiple properties. Examples show how to use multiple properties together.
  • stop(): Stops currently running animations on selected elements. Examples are included and show how to stop animations.

jQuery HTML&CSS Methods

  • Get and Set Content and Attributes:

    • text(): Sets or returns text content.
    • html(): Sets or returns content including HTML.
    • val(): Sets or returns input field values.
    • attr(): Sets or returns attributes.
    • Include examples for how to use each method; returning or setting text, content, or attributes.
  • Add and Remove Elements:

    • append(): Adds content to the end of selected elements.
    • prepend(): Adds content to the beginning of selected elements.
    • after(): Adds content after selected elements.
    • before(): Adds content before selected elements.
    • remove(): Removes the selected elements.
    • empty(): Removes content from selected elements.
    • Provides examples of how to add and remove elements including detailed content, using these specific jQuery methods.
  • Get and Set CSS Classes:

    • addClass(): Adds class(es) to selected elements.
    • removeClass(): Removes class(es) from selected elements.
    • toggleClass(): Toggles a class on/off for selected elements.
    • css(): Sets or returns CSS styles. Provides specific examples of usage for each method
    • Show how to add, remove, toggle CSS classes and return or modify style elements with css() method.

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