At the Forge - jQuery
What makes jQuery so special and different? What does it offer? And, how can you integrate it into your applications? This month, I try to answer all of these questions, as we explore some of the basic features of jQuery. Next month, we'll look at some of the UI widgets that jQuery provides to spruce up our sites and make them more functional.
$('foo') // Prototype
to get the elements with id attributes of foo and bar. The number of parameters to Prototype's $() determines whether it returns a single value or an array, as well as how many elements that returned array contains.
Prototype also lets you retrieve items using CSS selectors (and a variety of pseudo-selectors), using the $$() function. For example:
$$('tr.even') // Prototype
returns an array (and always an array, even if it matches only a single object) of all of the tr tags with a class of even.
Well, jQuery works similarly, except that it has only a single function, $(). That function is smart enough to recognize what you want, based on a single CSS-style selector that you give it. (And yes, you may specify only a single selector.) However, id attributes need to begin with a # character, as is the case in CSS. Thus, you can say:
$('#foo') // jQuery
to get all the tags (and there should be only one such tag) that have an id attribute of foo, and:
$('tr.even') // jQuery
Pick up any e-commerce web or mobile app today, and you’ll be holding a mashup of interconnected applications and services from a variety of different providers. For instance, when you connect to Amazon’s e-commerce app, cookies, tags and pixels that are monitored by solutions like Exact Target, BazaarVoice, Bing, Shopzilla, Liveramp and Google Tag Manager track every action you take. You’re presented with special offers and coupons based on your viewing and buying patterns. If you find something you want for your birthday, a third party manages your wish list, which you can share through multiple social- media outlets or email to a friend. When you select something to buy, you find yourself presented with similar items as kind suggestions. And when you finally check out, you’re offered the ability to pay with promo codes, gifts cards, PayPal or a variety of credit cards.Get the Guide
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