jQuery – The noConflict() Method

What if you wish to use other frameworks on your pages, while still using jQuery?

jQuery and Other JavaScript Frameworks

As you already know; jQuery uses the $ sign as a shortcut for jQuery.

There are many other popular JavaScript frameworks like: Angular, Backbone, Ember, Knockout, and more.

What if other JavaScript frameworks also use the $ sign as a shortcut?

If two different frameworks are using the same shortcut, one of them might stop working.

The jQuery team have already thought about this, and implemented the noConflict() method.

Continue reading jQuery – The noConflict() Method

jQuery – AJAX get() and post() Methods

The jQuery get() and post() methods are used to request data from the server with an HTTP GET or POST request.

HTTP Request: GET vs. POST

Two commonly used methods for a request-response between a client and server are: GET and POST.

  • GET – Requests data from a specified resource
  • POST – Submits data to be processed to a specified resource

GET is basically used for just getting (retrieving) some data from the server. Note: The GET method may return cached data.

POST can also be used to get some data from the server. However, the POST method NEVER caches data, and is often used to send data along with the request.

To learn more about GET and POST, and the differences between the two methods, please read our HTTP Methods GET vs POST article. Continue reading jQuery – AJAX get() and post() Methods

jQuery – AJAX load() Method

jQuery load() Method

The jQuery load() method is a simple, but powerful AJAX method.

The load() method loads data from a server and puts the returned data into the selected element.

Syntax:

$(selector).load(URL,data,callback);

The required URL parameter specifies the URL you wish to load.

The optional data parameter specifies a set of querystring key/value pairs to send along with the request. Continue reading jQuery – AJAX load() Method

jQuery – AJAX Introduction

AJAX is the art of exchanging data with a server, and updating parts of a web page – without reloading the whole page.

What is AJAX?

AJAX = Asynchronous JavaScript and XML.

In short; AJAX is about loading data in the background and display it on the webpage, without reloading the whole page.

Examples of applications using AJAX: Gmail, Google Maps, Youtube, and Facebook tabs.

 

Continue reading jQuery – AJAX Introduction

jQuery Traversing – Filtering

The first(), last(), eq(), filter() and not() Methods

The most basic filtering methods are first(), last() and eq(), which allow you to select a specific element based on its position in a group of elements.

Other filtering methods, like filter() and not() allow you to select elements that match, or do not match, a certain criteria.

Continue reading jQuery Traversing – Filtering

jQuery Traversing – Siblings

With jQuery you can traverse sideways in the DOM tree to find siblings of an element.

Siblings share the same parent.

Traversing Sideways in The DOM Tree

There are many useful jQuery methods for traversing sideways in the DOM tree:

  • siblings()
  • next()
  • nextAll()
  • nextUntil()
  • prev()
  • prevAll()
  • prevUntil()

Continue reading jQuery Traversing – Siblings

jQuery Traversing – Descendants

With jQuery you can traverse down the DOM tree to find descendants of an element.

A descendant is a child, grandchild, great-grandchild, and so on.

Traversing Down the DOM Tree

Two useful jQuery methods for traversing down the DOM tree are:

  • children()
  • find()

Continue reading jQuery Traversing – Descendants

jQuery Traversing – Ancestors

With jQuery you can traverse up the DOM tree to find ancestors of an element.

An ancestor is a parent, grandparent, great-grandparent, and so on.

Traversing Up the DOM Tree

Three useful jQuery methods for traversing up the DOM tree are:

  • parent()
  • parents()
  • parentsUntil()

Continue reading jQuery Traversing – Ancestors

jQuery Traversing

What is Traversing?

jQuery traversing, which means “move through”, are used to “find” (or select) HTML elements based on their relation to other elements. Start with one selection and move through that selection until you reach the elements you desire.

The image below illustrates an HTML page as a tree (DOM tree). With jQuery traversing, you can easily move up (ancestors), down (descendants) and sideways (siblings) in the tree, starting from the selected (current) element. This movement is called traversing – or moving through – the DOM tree.

Illustration explained:

  • The <div> element is the parent of <ul>, and an ancestor of everything inside of it
  • The <ul> element is the parent of both <li> elements, and a child of <div>
  • The left <li> element is the parent of <span>, child of <ul> and a descendant of <div>
  • The <span> element is a child of the left <li> and a descendant of <ul> and <div>
  • The two <li> elements are siblings (they share the same parent)
  • The right <li> element is the parent of <b>, child of <ul> and a descendant of <div>
  • The <b> element is a child of the right <li> and a descendant of <ul> and <div>

An ancestor is a parent, grandparent, great-grandparent, and so on.
A descendant is a child, grandchild, great-grandchild, and so on.
Siblings share the same parent.

Traversing the DOM

jQuery provides a variety of methods that allow us to traverse the DOM.

The largest category of traversal methods are tree-traversal.

The next chapters will show us how to travel up, down and sideways in the DOM tree.

jQuery – Dimensions

With jQuery, it is easy to work with the dimensions of elements and browser window.

jQuery Dimension Methods

jQuery has several important methods for working with dimensions:

  • width()
  • height()
  • innerWidth()
  • innerHeight()
  • outerWidth()
  • outerHeight()

jQuery Dimensions

Continue reading jQuery – Dimensions