Drupal provides methods for
implementing JavaScript. Using these methods will help to keep your code clean
and to ensure compatibility with the way other modules implement JavaScript.
A couple of simple principles guide
Drupal's JavaScript approach:
· All pages should be perfectly
functional without scripts. JavaScript provides alternatives or supplements -
not replacements - for standard elements.
·
No JavaScript is hard-coded into
pages. Rather, actions are attached dynamically to page elements--and only if
the needed JavaScript support is present.
Read more here https://drupal.org/node/121997
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