resources/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  * @author Trevor Parscal <tparscal@wikimedia.org>
   7  * @author Krinkle <krinklemail@gmail.com>
   8  * @version 0.2.0
   9  * @license GPL v2
  10  */
  11 ( function( $ ) {
  12
  13 $.fn.placeholder = function() {
  14
  15         return this.each( function() {
  16
  17                 // If the HTML5 placeholder attribute is supported, use it
  18                 if ( this.placeholder && 'placeholder' in document.createElement( this.tagName ) ) {
  19                         return;
  20                 }
  21
  22                 var placeholder = this.getAttribute('placeholder');
  23                 var $input = $(this);
  24
  25                 // Show initially, if empty
  26                 if ( this.value === '' || this.value == placeholder ) {
  27                         $input.addClass( 'placeholder' ).val( placeholder );
  28                 }
  29
  30                 $input
  31                         // Show on blur if empty
  32                         .blur( function() {
  33                                 if ( this.value === '' ) {
  34                                         this.value = placeholder;
  35                                         $input.addClass( 'placeholder' );
  36                                 } else {
  37                                         $input.removeClass( 'placeholder' );
  38                                 }
  39                         } )
  40
  41                         // Hide on focus
  42                         .focus( function() {
  43                                 if ($input.hasClass('placeholder')) {
  44                                         this.value = '';
  45                                         $input.removeClass( 'placeholder' );
  46                                 }
  47                         } );
  48
  49                 // Blank on submit -- prevents submitting with unintended value
  50                 this.form && $( this.form ).submit( function() {
  51                         // $input.trigger( 'focus' ); would be problematic
  52                         // because it actually focuses $input, leading
  53                         // to nasty behavior in mobile browsers
  54                         if ( $input.hasClass('placeholder') ) {
  55                                 $input
  56                                         .val( '' )
  57                                         .removeClass( 'placeholder' );
  58                         }
  59                 });
  60
  61         });
  62 };
  63 } )( jQuery );