Category: JavaScript

jQuery – Get Content and Attributes

jQuery contains powerful methods for changing and manipulating HTML elements and attributes.

jQuery DOM Manipulation

One very important part of jQuery is the possibility to manipulate the DOM.

jQuery comes with a bunch of DOM related methods that make it easy to access and manipulate elements and attributes.

DOM = Document Object Model

The DOM defines a standard for accessing HTML and XML documents:

“The W3C Document Object Model (DOM) is a platform and language-neutral interface that allows programs and scripts to dynamically access and update the content, structure, and style of a document.”

Continue reading jQuery – Get Content and Attributes

jQuery – Chaining

With jQuery, you can chain together actions/methods.

Chaining allows us to run multiple jQuery methods (on the same element) within a single statement.

Continue reading jQuery – Chaining

jQuery Callback Functions

A callback function is executed after the current effect is 100% finished.

jQuery Callback Functions

JavaScript statements are executed line by line. However, with effects, the next line of code can be run even though the effect is not finished. This can create errors.

To prevent this, you can create a callback function.

A callback function is executed after the current effect is finished.

Typical syntax: $(selector).hide(speed,callback); Continue reading jQuery Callback Functions

jQuery Stop Animations

jQuery stop() Method

The jQuery stop() method is used to stop an animation or effect before it is finished.

The stop() method works for all jQuery effect functions, including sliding, fading and custom animations. Continue reading jQuery Stop Animations

jQuery Effects – Animation

jQuery Animations – The animate() Method

The jQuery animate() method is used to create custom animations.

Syntax:

$(selector).animate({params},speed,callback);

The required params parameter defines the CSS properties to be animated.

The optional speed parameter specifies the duration of the effect. It can take the following values: “slow”, “fast”, or milliseconds.

The optional callback parameter is a function to be executed after the animation completes. Continue reading jQuery Effects – Animation

jQuery Effects – Sliding

jQuery Sliding Methods

With jQuery you can create a sliding effect on elements.

jQuery has the following slide methods:

  • slideDown()
  • slideUp()
  • slideToggle()

Continue reading jQuery Effects – Sliding

jQuery Effects – Fading

jQuery Fading Methods

With jQuery you can fade an element in and out of visibility.

jQuery has the following fade methods:

  • fadeIn()
  • fadeOut()
  • fadeToggle()
  • fadeTo()

Continue reading jQuery Effects – Fading

jQuery Effects – Hide and Show

jQuery hide() and show()

With jQuery, you can hide and show HTML elements with the hide() and show() methods:

Example

$("#hide").click(function(){
  $("p").hide();
});

$("#show").click(function(){
  $("p").show();
});

Syntax:

$(selector).hide(speed,callback);

$(selector).show(speed,callback);

The optional speed parameter specifies the speed of the hiding/showing, and can take the following values: “slow”, “fast”, or milliseconds. Continue reading jQuery Effects – Hide and Show

jQuery Event Methods

jQuery is tailor-made to respond to events in an HTML page.

What are Events?

All the different visitors’ actions that a web page can respond to are called events.

An event represents the precise moment when something happens.

Examples:

  • moving a mouse over an element
  • selecting a radio button
  • clicking on an element

The term “fires/fired” is often used with events. Example: “The keypress event is fired, the moment you press a key”. Continue reading jQuery Event Methods

jQuery Selectors

jQuery selectors are one of the most important parts of the jQuery library.

jQuery Selectors

jQuery selectors allow you to select and manipulate HTML element(s).

jQuery selectors are used to “find” (or select) HTML elements based on their name, id, classes, types, attributes, values of attributes and much more. It’s based on the existing CSS Selectors, and in addition, it has some own custom selectors.

All selectors in jQuery start with the dollar sign and parentheses: $().

Continue reading jQuery Selectors