May 2017
Intermediate to advanced
448 pages
10h 10m
English
Content preview from Learning jQuery 3 - Fifth Edition
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Delegating early
Despite these efficiency concerns, there are reasons we may yet choose to use document as our delegation context. In general, we can only bind event handlers once the DOM elements they are attached to are loaded, which is why we typically place our code inside $(() => {}). However, the document element is available immediately, so we don't need to wait for the whole DOM to be ready before we bind to it. Even if the script is referenced in the <head> of the document, as it is in our example, we can call .on() right away, as follows:
(function($) { $(document) .on('mouseenter mouseleave', 'div.photo', (e) => { const $details = $(e.currentTarget).find('.details'); if (e.type == 'mouseenter') { $details.fadeTo('fast', 0.7); ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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