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50 lines
1.0 KiB
CoffeeScript
50 lines
1.0 KiB
CoffeeScript
$ = require "jquery"
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module.exports = (jqueryObj) ->
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jqueryObj.each ->
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elem = $(this)
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minTop = threshold = basePos = undefined
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currentlyFloating = false
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originalPositioning = elem.css "position"
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originalLeft = elem.css "left"
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originalTop = elem.css "top"
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originalLeft = elem.css "right"
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updateMetrics = ->
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needRestore = currentlyFloating
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if needRestore
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makeNotFloating()
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basePos = elem.offset()
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minTop = elem.data("min-top") ? 0
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threshold = basePos.top - minTop
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if needRestore
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makeFloating()
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makeFloating = ->
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currentlyFloating = true
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elem.css
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position: "fixed"
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top: "#{minTop}px"
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right: "auto"
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left: "#{basePos.left}px"
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makeNotFloating = ->
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currentlyFloating = false
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elem.attr "style", ""
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#elem.css
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# position: originalPositioning
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# top: originalTop
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updateMetrics()
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$(window).on "resize", updateMetrics
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$(document).on "scroll", (event) ->
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if $(document).scrollTop() >= threshold
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makeFloating()
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else
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makeNotFloating()
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