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/** | |
* @version 1.0.4 | |
* @require jQuery 1.0+ | |
*/ | |
(function ($) { | |
/** | |
* @param opts | |
* disable: trueならばスクロールを無効にする | |
* duration: 'fast','slow'またはミリ秒 | |
* offsetTop: ビューより上部の余白分 | |
* isBottomBase: trueならばビューが画面外に出た時にスクロールする。falseならばビューの上端が画面上端に達した時にスクロールする | |
*/ | |
$.fn.follow = function (opts) { | |
opts = opts || {}; | |
$.extend({ | |
disable: false, | |
duration: 'fast', | |
offsetTop: 0, | |
isBottomBase: false | |
}, opts); | |
if (opts.disable) return; | |
var $obj = $(this); | |
var offsetTop = $obj.offset().top; | |
var $window = $(window); | |
$window.scroll(function () { | |
var scrollTop = $window.scrollTop(); | |
var basePos; | |
var marginTop; | |
if (opts.isBottomBase) { | |
basePos = $obj.outerHeight(); | |
var ex = scrollTop % ($obj.outerHeight() + offsetTop); | |
marginTop = scrollTop - ex - offsetTop + opts.offsetTop; | |
} else { | |
basePos = 0; | |
marginTop = scrollTop - offsetTop + opts.offsetTop; | |
} | |
var x = scrollTop % ($obj.outerHeight() + offsetTop); | |
if (scrollTop > offsetTop + basePos) { | |
$obj.stop().animate({ | |
marginTop: marginTop | |
}, { | |
duration: opts.duration, | |
complete: function () {} | |
}); | |
} else { | |
$obj.stop().animate({ | |
marginTop: 0 | |
}, { | |
complete: function () {} | |
}); | |
} | |
}); | |
}; | |
})(jQuery); |
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