resources/src/jquery/jquery.expandableField.js

   1 /**
   2  * This plugin provides functionality to expand a text box on focus to double it's current width
   3  *
   4  * Usage:
   5  *
   6  * Set options:
   7  *              $('#textbox').expandableField( { option1: value1, option2: value2 } );
   8  *              $('#textbox').expandableField( option, value );
   9  * Get option:
  10  *              value = $('#textbox').expandableField( option );
  11  * Initialize:
  12  *              $('#textbox').expandableField();
  13  *
  14  * Options:
  15  */
  16 ( function ( $ ) {
  17
  18         $.expandableField = {
  19                 /**
  20                  * Expand the field, make the callback
  21                  *
  22                  * @param {jQuery.Event} e Event
  23                  * @param {Object} context
  24                  */
  25                 expandField: function ( e, context ) {
  26                         context.config.beforeExpand.call( context.data.$field, context );
  27                         context.data.$field
  28                                 .animate( { width: context.data.expandedWidth }, 'fast', function () {
  29                                         context.config.afterExpand.call( this, context );
  30                                 } );
  31                 },
  32                 /**
  33                  * Condense the field, make the callback
  34                  *
  35                  * @param {jQuery.Event} e Event
  36                  * @param {Object} context
  37                  */
  38                 condenseField: function ( e, context ) {
  39                         context.config.beforeCondense.call( context.data.$field, context );
  40                         context.data.$field
  41                                 .animate( { width: context.data.condensedWidth }, 'fast', function () {
  42                                         context.config.afterCondense.call( this, context );
  43                                 } );
  44                 },
  45                 /**
  46                  * Sets the value of a property, and updates the widget accordingly
  47                  *
  48                  * @param {Object} context
  49                  * @param {string} property Name of property
  50                  * @param {Mixed} value Value to set property with
  51                  */
  52                 configure: function ( context, property, value ) {
  53                         // TODO: Validate creation using fallback values
  54                         context.config[ property ] = value;
  55                 }
  56
  57         };
  58
  59         $.fn.expandableField = function () {
  60
  61                 // Multi-context fields
  62                 var returnValue,
  63                         args = arguments;
  64
  65                 $( this ).each( function () {
  66                         var key, context, timeout;
  67
  68                         /* Construction / Loading */
  69
  70                         context = $( this ).data( 'expandableField-context' );
  71
  72                         // TODO: Do we need to check both null and undefined?
  73                         if ( context === undefined || context === null ) {
  74                                 context = {
  75                                         config: {
  76                                                 // callback function for before collapse
  77                                                 beforeCondense: function () {},
  78
  79                                                 // callback function for before expand
  80                                                 beforeExpand: function () {},
  81
  82                                                 // callback function for after collapse
  83                                                 afterCondense: function () {},
  84
  85                                                 // callback function for after expand
  86                                                 afterExpand: function () {},
  87
  88                                                 // Whether the field should expand to the left or the right -- defaults to left
  89                                                 expandToLeft: true
  90                                         }
  91                                 };
  92                         }
  93
  94                         /* API */
  95                         // Handle various calling styles
  96                         if ( args.length > 0 ) {
  97                                 if ( typeof args[ 0 ] === 'object' ) {
  98                                         // Apply set of properties
  99                                         for ( key in args[ 0 ] ) {
 100                                                 $.expandableField.configure( context, key, args[ 0 ][ key ] );
 101                                         }
 102                                 } else if ( typeof args[ 0 ] === 'string' ) {
 103                                         if ( args.length > 1 ) {
 104                                                 // Set property values
 105                                                 $.expandableField.configure( context, args[ 0 ], args[ 1 ] );
 106
 107                                         // TODO: Do we need to check both null and undefined?
 108                                         } else if ( returnValue === null || returnValue === undefined ) {
 109                                                 // Get property values, but don't give access to internal data - returns only the first
 110                                                 returnValue = ( args[ 0 ] in context.config ? undefined : context.config[ args[ 0 ] ] );
 111                                         }
 112                                 }
 113                         }
 114
 115                         /* Initialization */
 116
 117                         if ( context.data === undefined ) {
 118                                 context.data = {
 119                                         // The width of the field in it's condensed state
 120                                         condensedWidth: $( this ).width(),
 121
 122                                         // The width of the field in it's expanded state
 123                                         expandedWidth: $( this ).width() * 2,
 124
 125                                         // Reference to the field
 126                                         $field: $( this )
 127                                 };
 128
 129                                 $( this )
 130                                         .addClass( 'expandableField' )
 131                                         .focus( function ( e ) {
 132                                                 clearTimeout( timeout );
 133                                                 $.expandableField.expandField( e, context );
 134                                         } )
 135                                         .blur( function ( e ) {
 136                                                 timeout = setTimeout( function () {
 137                                                         $.expandableField.condenseField( e, context );
 138                                                 }, 250 );
 139                                         } );
 140                         }
 141                         // Store the context for next time
 142                         $( this ).data( 'expandableField-context', context );
 143                 } );
 144                 return returnValue !== undefined ? returnValue : $( this );
 145         };
 146
 147 }( jQuery ) );