The most basic concept of jQuery is to “select some elements and do something with them.” jQuery supports most CSS3 selectors, as well as some non-standard selectors. For a complete selector reference, visit the Selectors documentation on api.jquery.com. link Selecting Elements by ID 1 $( “#myId” ); // Note IDs must be unique per page. … Continue reading →

Once you’ve made an initial selection with jQuery, you can traverse deeper into what was just selected. Traversing can be broken down into three basic parts: parents, children, and siblings. jQuery has an abundance of easy-to-use methods for all these parts. Notice that each of these methods can optionally be passed string selectors, and some … Continue reading →

.index() is a method on jQuery objects that’s generally used to search for a given element within the jQuery object that it’s called on. This method has four different signatures with different semantics that can be confusing. This article covers details about how to understand the way .index() works with each signature. link .index() with … Continue reading →

jQuery offers several utility methods in the $ namespace. These methods are helpful for accomplishing routine programming tasks. For a complete reference on jQuery utility methods, visit the utilities documentation on api.jquery.com. Below are examples of a few of the utility methods: link $.trim()Removes leading and trailing whitespace: 1 2 // Returns “lots of extra … Continue reading →

link Getters & SettersSome jQuery methods can be used to either assign or read some value on a selection. When the method is called with a value as an argument, it’s referred to as a setter because it sets (or assigns) that value. When the method is called with no argument, it gets (or reads) … Continue reading →

Selector optimization is less important than it used to be, as more browsers implement document.querySelectorAll() and the burden of selection shifts from jQuery to the browser. However, there are still some tips to keep in mind when selector performance becomes a bottleneck. link jQuery ExtensionsWhen possible, avoid selectors that include jQuery extensions. These extensions cannot … Continue reading →

Sometimes you want to make a piece of functionality available throughout your code. For example, perhaps you want a single method you can call on a jQuery selection that performs a series of operations on the selection. In this case, you may want to write a plugin. link How jQuery Works 101: jQuery Object MethodsBefore … Continue reading →

The jQuery library and virtually all of its plugins are contained within the jQuery namespace. As a general rule, global objects are stored inside the jQuery namespace as well, so you shouldn’t get a clash between jQuery and any other library (like prototype.js, MooTools, or YUI). That said, there is one caveat: by default, jQuery … Continue reading →

jQuery includes a handy way to get and set CSS properties of elements: 1 2 3 4 5 // Getting CSS properties. $( “h1” ).css( “fontSize” ); // Returns a string such as “19px”. $( “h1” ).css( “font-size” ); // Also works. 1 2 3 4 5 6 7 8 9 // Setting CSS properties. … Continue reading →

**Note:** This documentation refers to functionality made available in jQuery UI 1.11. As of jQuery UI 1.11, all of the library’s source files support using AMD. This means that you can manage your jQuery UI dependencies without using Download Builder, and load jQuery UI’s source files asynchronously using an AMD loader such as RequireJS. In … Continue reading →