Tips for writing better Javascript using jQuery

Mistakes I made using jQuery, and how to avoid them Andy Peatling apeatling.com @apeatlingSaturday, 13 October, 12

Mistakes I made using jQuery, and how to avoid them Tips for writing better Javascript using jQuerySaturday, 13 October, 12

Hi, I’m Andy I work for Automattic I work on WordPress.comSaturday, 13 October, 12

I used to live in Vancouver...Saturday, 13 October, 12

...now I live in Winnipeg.Saturday, 13 October, 12

Saturday, 13 October, 12

jQuery + WordPress Selectors Events AJAX + StateSaturday, 13 October, 12

Javascript !== jQuery javascriptenlightenment.comSaturday, 13 October, 12

jQuery + WordPressSaturday, 13 October, 12

Use the version of jQuery bundled with WordPress core. jQuery + WordPress: 1/3Saturday, 13 October, 12

Don’t assume you can use $() without conﬂict. jQuery + WordPress: 2/3Saturday, 13 October, 12

Namespace your events! Don’t be heavy handed in your plugins (or theme). jQuery + WordPress: 3/3Saturday, 13 October, 12

SelectorsSaturday, 13 October, 12

Cache your selectors for extra speed! Selectors: 1/4Saturday, 13 October, 12

Cache your selectors for extra speed! 60-70% faster! Selectors: 1/4Saturday, 13 October, 12

Use chaining where it makes sense. Selectors: 2/4Saturday, 13 October, 12

Be aware of the jQuery stack Selectors: 3/4Saturday, 13 October, 12

Be aware of the jQuery stack Ref: http://bit.ly/PW2hpu Selectors: 3/4Saturday, 13 October, 12

Use context in your selectors. Selectors: 4/4Saturday, 13 October, 12

Use context in your selectors. 15-20% faster! Selectors: 4/4Saturday, 13 October, 12

Use context in your selectors. Even faster! Selectors: 4/4Saturday, 13 October, 12

EventsSaturday, 13 October, 12

Use .on() Events: 1/3Saturday, 13 October, 12

Oh, and make sure you’re delegating. Events: 2/3Saturday, 13 October, 12

Oh, and make sure you’re delegating. Event bound to one element, not potentially hundreds of elements... faster! Events: 2/3Saturday, 13 October, 12

Custom Events are awesome! Ref: http://bit.ly/PW2hpu Events: 3/3Saturday, 13 October, 12

Custom Events are awesome! Events: 3/3Saturday, 13 October, 12

Custom Events are awesome! Ref: http://bit.ly/PW2hpu Events: 3/3Saturday, 13 October, 12

Custom Events are awesome! Ref: http://bit.ly/PW2hpuSaturday, 13 October, 12

AJAX + StateSaturday, 13 October, 12

Make use of HTML 5 data attributesSaturday, 13 October, 12

Make use of HTML 5 data attributes AJAX + State: 1/3Saturday, 13 October, 12

Don’t get caught out by the A in AJAX.Saturday, 13 October, 12

Don’t get caught out by the A in AJAX. AJAX + State: 2/3Saturday, 13 October, 12

Use $.Deferred() when state gets more complex. AJAX + State: 3/3Saturday, 13 October, 12

What if we want the spinner to show for at least one second? AJAX + State: 3/3Saturday, 13 October, 12

We could manage our own state... AJAX + State: 3/3Saturday, 13 October, 12

Avoid the duplication, use $.Deferred() AJAX + State: 3/3Saturday, 13 October, 12

http://api.jquery.com/category/deferred-object/Saturday, 13 October, 12

Thanks! Andy Peatling apeatling.com @apeatlingSaturday, 13 October, 12

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Tips for writing better Javascript using jQuery

by apeatling on Oct 13, 2012

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