| 1 |
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| 2 | El.bindings.topFloat = function(el, offset) {
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| 3 | var h = el.offsetHeight + offset
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| 4 | , lastAbs = 0
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| 5 | , lastTop = 0
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| 6 | , toFix = 0
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| 7 |
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| 8 | El.on(window, "scroll", function(e) {
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| 9 | var pos
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| 10 | , top = El.scrollTop()
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| 11 |
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| 12 |
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| 13 | if (top < lastTop) {
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| 14 | if (top <= toFix) {
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| 15 | el.style.position = "fixed"
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| 16 | el.style.top = toFix = 0
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| 17 | } else {
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| 18 | pos = lastTop - h
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| 19 | if (toFix < 0 || lastAbs < pos) {
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| 20 | el.style.position = "absolute"
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| 21 | el.style.top = (lastAbs = toFix = pos < 0 ? 0 : pos < lastAbs ? lastAbs : pos) + "px"
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| 22 | }
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| 23 | }
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| 24 | } else if (toFix === 0) {
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| 25 | el.style.position = "absolute"
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| 26 | el.style.top = lastTop + "px"
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| 27 | lastAbs = lastTop
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| 28 | toFix = -1
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| 29 | }
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| 30 | lastTop = top
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| 31 | })
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| 32 | }
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| 33 |
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| 34 | El.bindings.topFloat.once = 1
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| 35 |
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| 36 |
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