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19.1 jQuery Selectors

jQuery was created in 2006 by John Resig. It was designed to handle Browser Incompatibilities and to simplify HTML DOM Manipulation, Event Handling, Animations, and Ajax.
For more than 10 years, jQuery has been the most popular JavaScript library in the world.
However, after JavaScript Version 5 (2009), most of the jQuery utilities can be solved with a few lines of standard JavaScript:

Finding HTML Element by Id

Return the element with id="id01":

var myElement = $("#id01");

var myElement = document.getElementById("id01");

Return all <p> elements:

var myElements = $("p");

var myElements = document.getElementsByTagName("p");

Return all elements with class="intro".

var myElements = $(".intro");

var myElements = document.getElementsByClassName("intro");

Return a list of all <p> elements with class="intro".

var myElements = $("p.intro");

var myElements = document.querySelectorAll("p.intro");

Eventually the navigation links, above, will be replaced by these << (previous) and >> (next) buttons below.

Example files created in this module: