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I have this code, but I don't know how to wrap it in Drupal. 

 $(document).scroll(function () {
    var y = $(this).scrollTop();
    if (y > 100) {
        $('.bottomMenu').fadeIn();
    } else {
        $('.bottomMenu').fadeOut();
    }

});

I've already activated the .js file and added the detail in .info, I can see it from the firebug that is ok, but from firebug console I can see that I have syntax errors.

From Drupal website I can see an example:

(function ($) { // Here code javascript })(jQuery);

Can someone show me how the code above should look like into Drupal? Thanks.

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1 Answer 1

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6

Here you go:

(function($) { 
  Drupal.behaviors.yourCustomName = {
    attach: function (context, settings) {

      $(document, context).scroll(function () {
        var y = $(this).scrollTop();
        if (y > 100) {
          $('.bottomMenu').fadeIn();
        } else {
          $('.bottomMenu').fadeOut();
        }
      });

    }
  };
})(jQuery);

Be sure to read the docs.

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3
  • You should always use jQuery once to avoid re-attaching behavior to the same element. And yes, something behaviors are attached multiple time using the root element (ie. document) as context. See coderwall.com/p/kd-4cg for a bit more information on JavaScript in Drupal 7.
    – Pierre Buyle
    Sep 9, 2013 at 12:48
  • @PierreBuyle always is a bit strong word here. In this case, only on first page load document should be in context. But good hint anyway :)
    – Mołot
    Sep 9, 2013 at 13:22
  • There is no guarantee that only the page load will apply the behaviors to a context containing the document element. So you can't assume it will never happen. Unless you are ready to review all JavaScript files from all the added modules.
    – Pierre Buyle
    Sep 10, 2013 at 15:16

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