resources/src/jquery/jquery.placeholder.js

   1 /**
   2  * HTML5 placeholder emulation for jQuery plugin
   3  *
   4  * This will automatically use the HTML5 placeholder attribute if supported, or emulate this behavior if not.
   5  *
   6  * This is a fork from Mathias Bynens' jquery.placeholder as of this commit
   7  * https://github.com/mathiasbynens/jquery-placeholder/blob/47f05d400e2dd16b59d144141a2cf54a9a77c502/jquery.placeholder.js
   8  *
   9  * @author Mathias Bynens <http://mathiasbynens.be/>
  10  * @author Trevor Parscal <tparscal@wikimedia.org>, 2012
  11  * @author Krinkle <krinklemail@gmail.com>, 2012
  12  * @author Alex Ivanov <alexivanov97@gmail.com>, 2013
  13  * @version 2.1.0
  14  * @license MIT
  15  */
  16 (function ($) {
  17
  18         var isInputSupported = 'placeholder' in document.createElement('input'),
  19                 isTextareaSupported = 'placeholder' in document.createElement('textarea'),
  20                 prototype = $.fn,
  21                 valHooks = $.valHooks,
  22                 propHooks = $.propHooks,
  23                 hooks,
  24                 placeholder;
  25
  26         if (isInputSupported && isTextareaSupported) {
  27
  28                 placeholder = prototype.placeholder = function (text) {
  29                         var hasArgs = arguments.length;
  30
  31                         if (hasArgs) {
  32                                 changePlaceholder.call(this, text);
  33                         }
  34
  35                         return this;
  36                 };
  37
  38                 placeholder.input = placeholder.textarea = true;
  39
  40         } else {
  41
  42                 placeholder = prototype.placeholder = function (text) {
  43                         var $this = this,
  44                                 hasArgs = arguments.length;
  45
  46                         if (hasArgs) {
  47                                 changePlaceholder.call(this, text);
  48                         }
  49
  50                         $this
  51                                 .filter((isInputSupported ? 'textarea' : ':input') + '[placeholder]')
  52                                 .filter(function () {
  53                                         return !$(this).data('placeholder-enabled');
  54                                 })
  55                                 .bind({
  56                                         'focus.placeholder drop.placeholder': clearPlaceholder,
  57                                         'blur.placeholder': setPlaceholder
  58                                 })
  59                                 .data('placeholder-enabled', true)
  60                                 .trigger('blur.placeholder');
  61                         return $this;
  62                 };
  63
  64                 placeholder.input = isInputSupported;
  65                 placeholder.textarea = isTextareaSupported;
  66
  67                 hooks = {
  68                         'get': function (element) {
  69                                 var $element = $(element),
  70                                         $passwordInput = $element.data('placeholder-password');
  71                                 if ($passwordInput) {
  72                                         return $passwordInput[0].value;
  73                                 }
  74
  75                                 return $element.data('placeholder-enabled') && $element.hasClass('placeholder') ? '' : element.value;
  76                         },
  77                         'set': function (element, value) {
  78                                 var $element = $(element),
  79                                         $passwordInput = $element.data('placeholder-password');
  80                                 if ($passwordInput) {
  81                                         $passwordInput[0].value = value;
  82                                         return value;
  83                                 }
  84
  85                                 if (!$element.data('placeholder-enabled')) {
  86                                         element.value = value;
  87                                         return value;
  88                                 }
  89                                 if (!value) {
  90                                         element.value = value;
  91                                         // Issue #56: Setting the placeholder causes problems if the element continues to have focus.
  92                                         if (element !== safeActiveElement()) {
  93                                                 // We can't use `triggerHandler` here because of dummy text/password inputs :(
  94                                                 setPlaceholder.call(element);
  95                                         }
  96                                 } else if ($element.hasClass('placeholder')) {
  97                                         if (!clearPlaceholder.call(element, true, value)) {
  98                                                 element.value = value;
  99                                         }
 100                                 } else {
 101                                         element.value = value;
 102                                 }
 103                                 // `set` can not return `undefined`; see http://jsapi.info/jquery/1.7.1/val#L2363
 104                                 return $element;
 105                         }
 106                 };
 107
 108                 if (!isInputSupported) {
 109                         valHooks.input = hooks;
 110                         propHooks.value = hooks;
 111                 }
 112                 if (!isTextareaSupported) {
 113                         valHooks.textarea = hooks;
 114                         propHooks.value = hooks;
 115                 }
 116
 117                 $(function () {
 118                         // Look for forms
 119                         $(document).delegate('form', 'submit.placeholder', function () {
 120                                 // Clear the placeholder values so they don't get submitted
 121                                 var $inputs = $('.placeholder', this).each(clearPlaceholder);
 122                                 setTimeout(function () {
 123                                         $inputs.each(setPlaceholder);
 124                                 }, 10);
 125                         });
 126                 });
 127
 128                 // Clear placeholder values upon page reload
 129                 $(window).bind('beforeunload.placeholder', function () {
 130                         $('.placeholder').each(function () {
 131                                 this.value = '';
 132                         });
 133                 });
 134
 135         }
 136
 137         function args(elem) {
 138                 // Return an object of element attributes
 139                 var newAttrs = {},
 140                         rinlinejQuery = /^jQuery\d+$/;
 141                 $.each(elem.attributes, function (i, attr) {
 142                         if (attr.specified && !rinlinejQuery.test(attr.name)) {
 143                                 newAttrs[attr.name] = attr.value;
 144                         }
 145                 });
 146                 return newAttrs;
 147         }
 148
 149         function clearPlaceholder(event, value) {
 150                 var input = this,
 151                         $input = $(input);
 152                 if (input.value === $input.attr('placeholder') && $input.hasClass('placeholder')) {
 153                         if ($input.data('placeholder-password')) {
 154                                 $input = $input.hide().next().show().attr('id', $input.removeAttr('id').data('placeholder-id'));
 155                                 // If `clearPlaceholder` was called from `$.valHooks.input.set`
 156                                 if (event === true) {
 157                                         $input[0].value = value;
 158                                         return value;
 159                                 }
 160                                 $input.focus();
 161                         } else {
 162                                 input.value = '';
 163                                 $input.removeClass('placeholder');
 164                                 if (input === safeActiveElement()) {
 165                                         input.select();
 166                                 }
 167                         }
 168                 }
 169         }
 170
 171         function setPlaceholder() {
 172                 var $replacement,
 173                         input = this,
 174                         $input = $(input),
 175                         id = this.id;
 176                 if (!input.value) {
 177                         if (input.type === 'password') {
 178                                 if (!$input.data('placeholder-textinput')) {
 179                                         try {
 180                                                 $replacement = $input.clone().attr({ 'type': 'text' });
 181                                         } catch (e) {
 182                                                 $replacement = $('<input>').attr($.extend(args(this), { 'type': 'text' }));
 183                                         }
 184                                         $replacement
 185                                                 .removeAttr('name')
 186                                                 .data({
 187                                                         'placeholder-password': $input,
 188                                                         'placeholder-id': id
 189                                                 })
 190                                                 .bind('focus.placeholder drop.placeholder', clearPlaceholder);
 191                                         $input
 192                                                 .data({
 193                                                         'placeholder-textinput': $replacement,
 194                                                         'placeholder-id': id
 195                                                 })
 196                                                 .before($replacement);
 197                                 }
 198                                 $input = $input.removeAttr('id').hide().prev().attr('id', id).show();
 199                                 // Note: `$input[0] != input` now!
 200                         }
 201                         $input.addClass('placeholder');
 202                         $input[0].value = $input.attr('placeholder');
 203                 } else {
 204                         $input.removeClass('placeholder');
 205                 }
 206         }
 207
 208         function safeActiveElement() {
 209                 // Avoid IE9 `document.activeElement` of death
 210                 // https://github.com/mathiasbynens/jquery-placeholder/pull/99
 211                 try {
 212                         return document.activeElement;
 213                 } catch (err) {}
 214         }
 215
 216         function changePlaceholder(text) {
 217                 var hasArgs = arguments.length,
 218                         $input = this;
 219                 if (hasArgs) {
 220                         if ($input.attr('placeholder') !== text) {
 221                                 $input.prop('placeholder', text);
 222                                 if ($input.hasClass('placeholder')) {
 223                                         $input[0].value = text;
 224                                 }
 225                         }
 226                 }
 227         }
 228
 229 }(jQuery));