add infieldlabel source

core/js/jquery.infieldlabel.js

@@ -0,0 +1,140 @@
+/*
+ * 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);