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Part II
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PART II
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Presentation Layer
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Handling Events from the Ribbon
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You ve seen how to add a control to the ribbon declaratively However, the control we added doesn t do anything useful Let s look at how we can handle events that are generated from our ribbon customizations As mentioned, a predefined number of controls can be added to the ribbon A list of these can be found at http://msdnmicrosoftcom/en-us/library/ ee537017aspx If we look at the ColorPicker control, we find that the following attributes are defined: Command This attribute is used to specify a command that should be executed when the control is clicked This attribute is present on all ribbon controls CommandPreview This attribute is used to specify a command that should be executed for previewing a color selection CommandRevert This attribute is used to specify a command that should be executed to revert a preview command QueryCommand This attribute is used to specify a command that should be executed to retrieve state information In a sense, these attributes allow us to hook up event handlers for whatever events are defined by the control Since the ribbon is primarily generated on the client side, handling events must also take place using client-side scripting In the case of the ribbon, this is commonly done using JavaScript and the Client Object Model (covered in detail in 4), although it is possible to use other techniques for handling events, as you ll see To see how this works in practice, let s add an event handler for our button control 1 To the Button element in the Elementsxml file, add the following attribute:
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<Button Id="3FirstDemoGroupHelloWorld" Command="3HelloWorldCommand" Sequence="14" Image16by16="/_layouts/images/NoteBoard_16x16png" Image32by32="/_layouts/images/NoteBoard_32x32png" Description="Displays a Hello World message" LabelText="Hello World" TemplateAlias="c1"/>
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2 After the closing tag of the CommandUIDefinitions element, add the following element:
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<CommandUIHandlers> <CommandUIHandler Command="3HelloWorldCommand" CommandAction="javascript: var notificationId = SPUINotifyaddNotification('Hello World');" /> </CommandUIHandlers>
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The Command attribute (and any other event handling attributes on a control) contains a reference to a CommandUIHandler element The CommandUIHandler then defines the action that should be taken when the event is raised In this simple example, we re executing some inline JavaScript to show a notification message using the Client Object Model Deploy the revised solution If all is well, clicking the Hello World button will show a message using the Notifications framework, as shown here:
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3
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Presentation Layer Overview
Earlier you saw that controls on the ribbon can t have their visibility toggled for usability reasons When a command cannot be used, best practice dictates that it should be disabled Let s look at how we can add this functionality to our button command On our CommandUIHandler element, add the following attribute:
<CommandUIHandler Command="3HelloWorldCommand" CommandAction="javascript: var notificationId = SPUINotifyaddNotification('Hello World');" EnabledScript="javascript: function helloWorldEnable() { return new Date()getMinutes()%2; } helloWorldEnable();"/>
This simple example periodically disables the button depending on the current time The EnabledScript attribute should refer to a script that returns a Boolean value One thing that this example highlights is that the script specified in EnableScript is called only when users click controls in the user interface
Complex Event Handling
The preceding examples have shown you how to handle events using embedded JavaScript; although this works well, as the JavaScript becomes more complex, it gets increasingly difficult to manage A common approach to dealing with this problem is to maintain scripts as separate files Let s look at how we can use external scripts when handling events
Adding Script Links Using a Delegate Control
The first thing that we need to do when using external scripts is to find a way to add a link to the script to our page The best method to achieve this is to use a delegate control Delegates are covered in more detail in 7 but for now it s enough to know that a delegate can be used to override certain parts of a SharePoint page The out-of-the-box master page that ships with SharePoint 2010 includes a delegate control named AdditionalPageHead in the page header By adding our own content to this delegate, we can add references to our external scripts 1 The easiest way to implement a delegate control is to add a user control to the %SPROOT%/TEMPLATE/CONTROLTEMPLATES folder This folder is mounted on all SharePoint sites as /_ControlTemplates/, and user controls contained here
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