| 1 | /* |
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| 2 | * autoscroll.js widget with jquery event(s) |
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| 3 | * Copyright 2011 Michael Whitford <michael@alwandassociates.com> |
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| 4 | * License: BSD |
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| 5 | */ |
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| 6 | |
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| 7 | // toggle - id of the toggle element for the click event |
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| 8 | // textarea - id of the textarea to autoscroll |
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| 9 | var toggleAutoScroll = function (toggle, textarea) { |
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| 10 | var autoScrollDebug = false; |
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| 11 | var state = toggle + 'interval'; |
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| 12 | var scrollOn = function() { |
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| 13 | if (autoScrollDebug) { console.log('on:', toggle, textarea); } |
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| 14 | var onAnimation = function(name, target) { |
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| 15 | jQuery('#' + name).unbind().click(function() { |
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| 16 | toggleAutoScroll(name, target); |
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| 17 | }).fadeTo(350, 1); |
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| 18 | }; |
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| 19 | // uses obj attached to window for state |
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| 20 | window[state] = {}; |
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| 21 | window[state].name = toggle; |
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| 22 | window[state].target = textarea; |
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| 23 | // get a handle to the textarea el |
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| 24 | var area = jQuery('#' + textarea); |
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| 25 | // set the interval |
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| 26 | window[state].interval = setInterval(function() { |
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| 27 | // ui hack? needs more testing |
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| 28 | area[0].scrollTop = area[0].scrollHeight; |
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| 29 | }, 2500); // 2.5 seconds |
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| 30 | onAnimation(toggle, textarea); |
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| 31 | }; |
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| 32 | var scrollOff = function() { |
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| 33 | if (autoScrollDebug) { console.log('off:', toggle, textarea); } |
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| 34 | var offAnimation = function(name, target) { |
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| 35 | jQuery('#' + name).unbind().click(function() { |
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| 36 | toggleAutoScroll(name, target); |
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| 37 | }).fadeTo(350, 0.55); |
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| 38 | }; |
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| 39 | offAnimation(toggle, textarea); |
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| 40 | clearInterval(window[state].interval); |
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| 41 | window[state] = undefined; |
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| 42 | }; |
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| 43 | if (arguments.length == 2) { |
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| 44 | if (typeof window[state] === 'undefined') { |
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| 45 | scrollOn(); |
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| 46 | } else { |
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| 47 | scrollOff(); |
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| 48 | } |
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| 49 | } |
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| 50 | return; |
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| 51 | }; |
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| 52 | |
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| 53 | // jquery onready |
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| 54 | |
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| 55 | jQuery(document).ready(function () { |
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| 56 | // turn it on by default |
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| 57 | toggleAutoScroll('autoscroll', 'output'); |
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| 58 | }); |
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| 59 | |
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| 60 | // todo: some key - toggle off |
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| 61 | // todo: drag scrollbar up - toggle off |
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| 62 | // todo: drag scrollbar to bottom - toggle off |
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| 63 | |
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