Question

How do I go about combining this old jQuery code into the v1.7 .on()?

v1.3 .live():

    $('#results tbody tr').live({
    mouseenter:
       function () { $(this).find('.popup').show(); },
    mouseleave:
       function () { $(this).find('.popup').hide(); }
    });

v1.7 .on():

$('#results tbody').on('mouseenter', 'tr', function () {
    $(this).find('.popup').show();
});
$('#results tbody').on('mouseleave', 'tr', function () {
    $(this).find('.popup').hide();
});

I want to pass both event handlers to one .on() call, but keep the brilliant event delegation .on() allows me to do.

Answer 1

You can pass an event-map as the first parameter:

$('#results tbody').on({
    'mouseenter' : function () {
        $(this).find('.popup').show();
     },
    'mouseleave' : function () {
        $(this).find('.popup').hide();
    }
}, 'tr');

jQuery documentation:

.on( events-map [, selector] [, data] ),
events-map A map in which the string keys represent one or more space-separated event types and
optional namespaces, and the values represent a handler function to be
called for the event(s).