Synnefo

/*

 * In-Field Label jQuery Plugin

 * http://fuelyourcoding.com/scripts/infield.html

 *

 * Copyright (c) 2009 Doug Neiner

 * Dual licensed under the MIT and GPL licenses.

 * Uses the same license as jQuery, see:

 * http://docs.jquery.com/License

 *

 * @version 0.1

 */

(function($){

    $.InFieldLabels = function(label,field, options){

        // To avoid scope issues, use 'base' instead of 'this'

        // to reference this class from internal events and functions.

        var base = this;

        // Access to jQuery and DOM versions of each element

        base.$label = $(label);

        base.label = label;

                 base.$field = $(field);

                base.field = field;

                base.$label.data("InFieldLabels", base);

                base.showing = true;

        base.init = function(){

                        // Merge supplied options with default options

            base.options = $.extend({},$.InFieldLabels.defaultOptions, options);

                        // Check if the field is already filled in

                        if(base.$field.val() != ""){

                                base.$label.hide();

                                base.showing = false;

                        };

                        base.$field.focus(function(){

                                base.fadeOnFocus();

                        }).blur(function(){

                                base.checkForEmpty(true);

                        }).bind('keydown.infieldlabel',function(e){

                                // Use of a namespace (.infieldlabel) allows us to

                                // unbind just this method later

                                base.hideOnChange(e);

                        }).change(function(e){

                                base.checkForEmpty();

                        }).bind('onPropertyChange', function(){

                                base.checkForEmpty();

                        });

        };

                // If the label is currently showing

                // then fade it down to the amount

                // specified in the settings

                base.fadeOnFocus = function(){

                        if(base.showing){

                                base.setOpacity(base.options.fadeOpacity);

                        };

                };

                base.setOpacity = function(opacity){

                        base.$label.stop().animate({ opacity: opacity }, base.options.fadeDuration);

                        base.showing = (opacity > 0.0);

                };

                // Checks for empty as a fail safe

                // set blur to true when passing from

                // the blur event

                base.checkForEmpty = function(blur){

                        if(base.$field.val() == ""){

                                base.prepForShow();

                                base.setOpacity( blur ? 1.0 : base.options.fadeOpacity );

                        } else {

                                base.setOpacity(0.0);

                        };

                };

                base.prepForShow = function(e){

                        if(!base.showing) {

                                // Prepare for a animate in...

                                base.$label.css({opacity: 0.0}).show();

                                // Reattach the keydown event

                                base.$field.bind('keydown.infieldlabel',function(e){

                                        base.hideOnChange(e);

                                });

                        };

                };

                base.hideOnChange = function(e){

                        if(

                                (e.keyCode == 16) || // Skip Shift

                                (e.keyCode == 9) // Skip Tab

                          ) return; 

                        if(base.showing){

                                base.$label.hide();

                                base.showing = false;

                        };

                        // Remove keydown event to save on CPU processing

                        base.$field.unbind('keydown.infieldlabel');

                };

                // Run the initialization method

        base.init();

    };

    $.InFieldLabels.defaultOptions = {

        fadeOpacity: 0.5, // Once a field has focus, how transparent should the label be

                fadeDuration: 300 // How long should it take to animate from 1.0 opacity to the fadeOpacity

    };

    $.fn.inFieldLabels = function(options){

        return this.each(function(){

                        // Find input or textarea based on for= attribute

                        // The for attribute on the label must contain the ID

                        // of the input or textarea element

                        var for_attr = $(this).attr('for');

                        if( !for_attr ) return; // Nothing to attach, since the for field wasn't used

                        // Find the referenced input or textarea element

                        var $field = $(

                                "input#" + for_attr + "[type='text']," + 

                                "input#" + for_attr + "[type='password']," + 

                                "textarea#" + for_attr

                                );

                        if( $field.length == 0) return; // Again, nothing to attach

                        // Only create object for input[text], input[password], or textarea

            (new $.InFieldLabels(this, $field[0], options));

        });

    };

})(jQuery);