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Listing 8.6 Code for the FormattingBehavior class
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Type.registerNamespace('Samples'); Samples.FormattingBehavior = function(element) { Samples.FormattingBehavior.initializeBase(this, [element]); this._hoverCssClass = null; this._focusCssClass = null; this._currentCssClass = null; this._mouseOver = null; this._focus = null;
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} Samples.FormattingBehavior.prototype = { initialize : function() { Samples.FormattingBehavior.callBaseMethod(this, 'initialize'); $addHandlers(this.get_element(), { mouseout:this._onMouseout, mouseover:this._onMouseover, focus:this._onFocus, blur:this._onBlur }, this); }, dispose : function() { $clearHandlers(this.get_element()); Samples.FormattingBehavior.callBaseMethod(this, 'dispose'); }, _onMouseover : function() { this._mouseOver = true; this._setCssClass(); }, _onMouseout : function() { this._mouseOver = false; this._setCssClass(); }, _onFocus : function() { this._focus = true;
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C Behavior s lifecycle
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this._setCssClass(); },
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_onBlur : function() { this._focus = false; this._setCssClass(); },
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Event handlers
_setCssClass : function() { if (this._currentCssClass) { Sys.UI.DomElement.removeCssClass(this._element, this._currentCssClass); this._currentCssClass = null; } if (this._error) { this._currentCssClass } else if (this._focus) { this._currentCssClass } else if (this._mouseOver) this._currentCssClass }
= this._errorCssClass;
= this._focusCssClass; { = this._hoverCssClass;
if (this._currentCssClass) { Sys.UI.DomElement.addCssClass(this._element, this._currentCssClass); } }, get_hoverCssClass : function() { return this._hoverCssClass; }, set_hoverCssClass : function(value) { this._hoverCssClass = value; }, get_focusCssClass : function() { return this._focusCssClass; }, set_focusCssClass : function(value) { this._focusCssClass = value; } } Samples.FormattingBehavior.registerClass( 'Samples.FormattingBehavior', Sys.UI.Behavior);
E Properties
Behaviors
The code in listing 8.6 shows how a client behavior is typically structured. In the constructor, you declare the class fields B. For example, _focusCssClass and _hoverCssClass store strings with the names of the CSS classes you want to assign when the associated element is hovered over or focused on. The other fields keep track of the current state of the associated element. For example, _focus and _mouseOver are Boolean values that tell whether you gave focus to the text box or you re hovering over it with the mouse. In the prototype object, you find the overrides of the initialize and dispose methods C. FormattingBehavior uses the $addHandlers method to hook up the mouseover, mouseout, focus, and blur events of the associated DOM element. Then, the same handlers are detached in the dispose method, using the $clearHandlers shortcut. Both the $addHandlers and $clearHandlers shortcuts were discussed in section 2.3. Next, you find the event handlers D, which you use to set the state of the element based on the event that it raised. Each event handler calls the _setCssClass method, which takes care of switching the element s CSS class based on the event raised. Finally, a relevant portion of the code is used to declare the client properties E, which are needed if you want to take advantage of the $create method to configure a new instance of the client behavior. Let s take time to copy the code for the client behavior to a JavaScript file and then reference it in an ASP.NET page through the ScriptManager control. This should be the easiest part if you read the previous chapters of the book. Listing 8.7 shows the code for simulating the in-place-edit effect in a simple form; embed this code in the form tag of the ASP.NET page.
Listing 8.7 Simulating the in-place edit functionality with the FormattingBehavior
<div class="form"> <div> <span>Name:</span> <asp:TextBox ID="Name" runat="server"></asp:TextBox> </div> <div> <span>Last Name:</span> <asp:TextBox ID="LastName" runat="server"></asp:TextBox> </div> </div> <script type="text/javascript"> <!-Sys.Application.add_init(pageInit);
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function pageInit(sender, e) { $create(Samples.FormattingBehavior, { 'hoverCssClass':'field_hover', 'focusCssClass':'field_focus' }, {}, {}, $get('Name')); $create(Samples.FormattingBehavior, { 'hoverCssClass':'field_hover', 'focusCssClass':'field_focus' }, {}, {}, $get('LastName')); } //--> </script>
The simple form declared in listing 8.7 consists of two text boxes. With a little imagination, you can think of it as a simplified version of a more complex form used for collecting user data. Note that the pageInit function which handles the init event of the Application object includes two $create statements. Each statement is used to create an instance of the FormattingBehavior behavior and wire it to the corresponding text box element. The values of the hoverCssClass and focusCssClass properties supplied in the $create statement are the names of the CSS classes used to obtain the in-place-edit effect. The CSS file used in the example is as follows; you should reference it in the ASP.NET page before running the example:
input { border: solid 2px #ffffff; margin: -2px; } .form div { margin-bottom: 5px; } .field_hover { border: dashed 2px #ababab; } .field_focus { border: solid 2px Green; }
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