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foundation.magellan.js
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foundation.magellan.js
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;(
function
(
$
,
window
,
document
,
undefined
)
{
'use strict'
;
Foundation
.
libs
.
magellan
=
{
name
:
'magellan'
,
version
:
'5.0.0'
,
settings
:
{
active_class
:
'active'
,
threshold
:
0
},
init
:
function
(
scope
,
method
,
options
)
{
this
.
fixed_magellan
=
$
(
"[data-magellan-expedition]"
);
this
.
set_threshold
();
this
.
last_destination
=
$
(
'[data-magellan-destination]'
).
last
();
this
.
events
();
},
events
:
function
()
{
var
self
=
this
;
$
(
this
.
scope
)
.
off
(
'.magellan'
)
.
on
(
'arrival.fndtn.magellan'
,
'[data-magellan-arrival]'
,
function
(
e
)
{
var
$destination
=
$
(
this
),
$expedition
=
$destination
.
closest
(
'[data-magellan-expedition]'
),
active_class
=
$expedition
.
attr
(
'data-magellan-active-class'
)
||
self
.
settings
.
active_class
;
$destination
.
closest
(
'[data-magellan-expedition]'
)
.
find
(
'[data-magellan-arrival]'
)
.
not
(
$destination
)
.
removeClass
(
active_class
);
$destination
.
addClass
(
active_class
);
});
this
.
fixed_magellan
.
off
(
'.magellan'
)
.
on
(
'update-position.fndtn.magellan'
,
function
()
{
var
$el
=
$
(
this
);
})
.
trigger
(
'update-position'
);
$
(
window
)
.
off
(
'.magellan'
)
.
on
(
'resize.fndtn.magellan'
,
function
()
{
this
.
fixed_magellan
.
trigger
(
'update-position'
);
}.
bind
(
this
))
.
on
(
'scroll.fndtn.magellan'
,
function
()
{
var
windowScrollTop
=
$
(
window
).
scrollTop
();
self
.
fixed_magellan
.
each
(
function
()
{
var
$expedition
=
$
(
this
);
if
(
typeof
$expedition
.
data
(
'magellan-top-offset'
)
===
'undefined'
)
{
$expedition
.
data
(
'magellan-top-offset'
,
$expedition
.
offset
().
top
);
}
if
(
typeof
$expedition
.
data
(
'magellan-fixed-position'
)
===
'undefined'
)
{
$expedition
.
data
(
'magellan-fixed-position'
,
false
);
}
var
fixed_position
=
(
windowScrollTop
+
self
.
settings
.
threshold
)
>
$expedition
.
data
(
"magellan-top-offset"
);
var
attr
=
$expedition
.
attr
(
'data-magellan-top-offset'
);
if
(
$expedition
.
data
(
"magellan-fixed-position"
)
!=
fixed_position
)
{
$expedition
.
data
(
"magellan-fixed-position"
,
fixed_position
);
if
(
fixed_position
)
{
$expedition
.
addClass
(
'fixed'
);
$expedition
.
css
({
position
:
"fixed"
,
top
:
0
});
}
else
{
$expedition
.
removeClass
(
'fixed'
);
$expedition
.
css
({
position
:
""
,
top
:
""
});
}
if
(
fixed_position
&&
typeof
attr
!=
'undefined'
&&
attr
!=
false
)
{
$expedition
.
css
({
position
:
"fixed"
,
top
:
attr
+
"px"
});
}
}
});
});
if
(
this
.
last_destination
.
length
>
0
)
{
$
(
window
).
on
(
'scroll.fndtn.magellan'
,
function
(
e
)
{
var
windowScrollTop
=
$
(
window
).
scrollTop
(),
scrolltopPlusHeight
=
windowScrollTop
+
$
(
window
).
height
(),
lastDestinationTop
=
Math
.
ceil
(
self
.
last_destination
.
offset
().
top
);
$
(
'[data-magellan-destination]'
).
each
(
function
()
{
var
$destination
=
$
(
this
),
destination_name
=
$destination
.
attr
(
'data-magellan-destination'
),
topOffset
=
$destination
.
offset
().
top
-
$destination
.
outerHeight
(
true
)
-
windowScrollTop
;
if
(
topOffset
<=
self
.
settings
.
threshold
)
{
$
(
"[data-magellan-arrival='"
+
destination_name
+
"']"
).
trigger
(
'arrival'
);
}
// In large screens we may hit the bottom of the page and dont reach the top of the last magellan-destination, so lets force it
if
(
scrolltopPlusHeight
>=
$
(
self
.
scope
).
height
()
&&
lastDestinationTop
>
windowScrollTop
&&
lastDestinationTop
<
scrolltopPlusHeight
)
{
$
(
'[data-magellan-arrival]'
).
last
().
trigger
(
'arrival'
);
}
});
});
}
},
set_threshold
:
function
()
{
if
(
typeof
this
.
settings
.
threshold
!==
'number'
)
{
this
.
settings
.
threshold
=
(
this
.
fixed_magellan
.
length
>
0
)
?
this
.
fixed_magellan
.
outerHeight
(
true
)
:
0
;
}
},
off
:
function
()
{
$
(
this
.
scope
).
off
(
'.fndtn.magellan'
);
$
(
window
).
off
(
'.fndtn.magellan'
);
},
reflow
:
function
()
{}
};
}(
jQuery
,
this
,
this
.
document
));
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