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annotate vendor/assets/javascripts/jquery.autosize.js @ 345:0b3a5edd923d

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coffee: application.
author edogawaconan <me@myconan.net>
date Thu, 03 Jul 2014 14:50:58 +0900
parents 56c4cd16d849
children
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1 // Autosize 1.13 - jQuery plugin for textareas
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2 // (c) 2012 Jack Moore - jacklmoore.com
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3 // license: www.opensource.org/licenses/mit-license.php
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4
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5 (function ($) {
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6 var
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7 defaults = {
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8 className: 'autosizejs',
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9 append: "",
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10 callback: false
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11 },
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12 hidden = 'hidden',
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13 borderBox = 'border-box',
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14 lineHeight = 'lineHeight',
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e8a0e82213cd Updated autosize from vendor, separated box size hack to its own function.
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15 copy = '<textarea tabindex="-1" style="position:absolute; top:-9999px; left:-9999px; right:auto; bottom:auto; -moz-box-sizing:content-box; -webkit-box-sizing:content-box; box-sizing:content-box; word-wrap:break-word; height:0 !important; min-height:0 !important; overflow:hidden;"/>',
79
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16 // line-height is omitted because IE7/IE8 doesn't return the correct value.
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17 copyStyle = [
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18 'fontFamily',
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19 'fontSize',
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20 'fontWeight',
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21 'fontStyle',
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22 'letterSpacing',
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23 'textTransform',
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24 'wordSpacing',
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25 'textIndent'
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26 ],
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27 oninput = 'oninput',
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28 onpropertychange = 'onpropertychange',
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29 test = $(copy)[0];
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30
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31 // For testing support in old FireFox
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32 test.setAttribute(oninput, "return");
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33
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34 if ($.isFunction(test[oninput]) || onpropertychange in test) {
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35
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36 // test that line-height can be accurately copied to avoid
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37 // incorrect value reporting in old IE and old Opera
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38 $(test).css(lineHeight, '99px');
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39 if ($(test).css(lineHeight) === '99px') {
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40 copyStyle.push(lineHeight);
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41 }
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42
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43 $.fn.autosize = function (options) {
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44 options = $.extend({}, defaults, options || {});
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45
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46 return this.each(function () {
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47 var
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48 ta = this,
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49 $ta = $(ta),
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50 mirror,
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51 minHeight = $ta.height(),
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52 maxHeight = parseInt($ta.css('maxHeight'), 10),
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53 active,
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54 i = copyStyle.length,
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55 resize,
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56 boxOffset = 0,
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57 value = ta.value,
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58 callback = $.isFunction(options.callback);
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59
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60 if ($ta.css('box-sizing') === borderBox || $ta.css('-moz-box-sizing') === borderBox || $ta.css('-webkit-box-sizing') === borderBox){
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61 boxOffset = $ta.outerHeight() - $ta.height();
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62 }
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63
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64 if ($ta.data('mirror') || $ta.data('ismirror')) {
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65 // if autosize has already been applied, exit.
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66 // if autosize is being applied to a mirror element, exit.
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67 return;
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68 } else {
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69 mirror = $(copy).data('ismirror', true).addClass(options.className)[0];
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70
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71 resize = $ta.css('resize') === 'none' ? 'none' : 'horizontal';
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72
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73 $ta.data('mirror', $(mirror)).css({
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74 overflow: hidden,
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75 overflowY: hidden,
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76 wordWrap: 'break-word',
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77 resize: resize
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78 });
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79 }
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80
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81 // Opera returns '-1px' when max-height is set to 'none'.
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82 maxHeight = maxHeight && maxHeight > 0 ? maxHeight : 9e4;
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83
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84 // Using mainly bare JS in this function because it is going
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85 // to fire very often while typing, and needs to very efficient.
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86 function adjust() {
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87 var height, overflow, original;
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88
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89 // the active flag keeps IE from tripping all over itself. Otherwise
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90 // actions in the adjust function will cause IE to call adjust again.
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91 if (!active) {
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92 active = true;
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93 mirror.value = ta.value + options.append;
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94 mirror.style.overflowY = ta.style.overflowY;
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95 original = parseInt(ta.style.height,10);
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96
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97 // Update the width in case the original textarea width has changed
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98 mirror.style.width = $ta.css('width');
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99
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100 // Needed for IE to reliably return the correct scrollHeight
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101 mirror.scrollTop = 0;
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102
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103 // Set a very high value for scrollTop to be sure the
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104 // mirror is scrolled all the way to the bottom.
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105 mirror.scrollTop = 9e4;
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106
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107 height = mirror.scrollTop;
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108 overflow = hidden;
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109 if (height > maxHeight) {
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110 height = maxHeight;
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111 overflow = 'scroll';
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112 } else if (height < minHeight) {
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113 height = minHeight;
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114 }
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115 height += boxOffset;
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116 ta.style.overflowY = overflow;
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117
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118 if (original !== height) {
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119 ta.style.height = height + 'px';
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120 if (callback) {
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121 options.callback.call(ta);
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122 }
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123 }
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124
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125 // This small timeout gives IE a chance to draw it's scrollbar
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126 // before adjust can be run again (prevents an infinite loop).
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127 setTimeout(function () {
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128 active = false;
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129 }, 1);
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130 }
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131 }
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132
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133 // mirror is a duplicate textarea located off-screen that
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134 // is automatically updated to contain the same text as the
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135 // original textarea. mirror always has a height of 0.
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136 // This gives a cross-browser supported way getting the actual
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137 // height of the text, through the scrollTop property.
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138 while (i--) {
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139 mirror.style[copyStyle[i]] = $ta.css(copyStyle[i]);
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140 }
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141
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142 $('body').append(mirror);
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143
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144 if (onpropertychange in ta) {
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145 if (oninput in ta) {
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146 // Detects IE9. IE9 does not fire onpropertychange or oninput for deletions,
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147 // so binding to onkeyup to catch most of those occassions. There is no way that I
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148 // know of to detect something like 'cut' in IE9.
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149 ta[oninput] = ta.onkeyup = adjust;
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150 } else {
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151 // IE7 / IE8
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152 ta[onpropertychange] = adjust;
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153 }
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154 } else {
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155 // Modern Browsers
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156 ta[oninput] = adjust;
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157
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158 // The textarea overflow is now hidden. But Chrome doesn't reflow the text after the scrollbars are removed.
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159 // This is a hack to get Chrome to reflow it's text.
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160 ta.value = '';
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161 ta.value = value;
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162 }
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163
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164 $(window).resize(adjust);
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165
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166 // Allow for manual triggering if needed.
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167 $ta.bind('autosize', adjust);
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168
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169 // Call adjust in case the textarea already contains text.
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170 adjust();
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171 });
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172 };
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173 } else {
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174 // Makes no changes for older browsers (FireFox3- and Safari4-)
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175 $.fn.autosize = function (callback) {
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176 return this;
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177 };
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178 }
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179
97
e8a0e82213cd Updated autosize from vendor, separated box size hack to its own function.
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180 }(window.jQuery || window.Zepto));