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NOTE
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SysIContainer
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Coincidentally, these are the methods that are required by the SysIContainer interface, which SysApplication implements We guess that these methods are what Microsoft de nes as container behavior
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Adding a Component Adding a component to SysApplication s collection of managed components is done through the addComponent method We used the add Component method once before in a 3 example, so let s import the source code from that example The code is redisplayed in Listing 43
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Listing 43 Using the addComponent Method
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var newComponent = SysComponentcreate( MyComponent, null, null, null, null); newComponentset_id("MyNewComponent"); SysApplicationaddComponent(newComponent);
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4: SysApplication
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In this example, we created a new component, but didn t provide a component id Because we failed to provide an id, addComponent is not automatically called by the SysComponentcreate method, and our component is just an object assigned to a variable, rather than a component managed by SysApplication We can manually add it to SysApplication s managed components collection by setting the id through the set_id method and then calling the addComponent method using the component as the method call s parameter The addComponent method does two things before it adds the component to the managed component collection First, it makes sure that id is set If it isn t, an invalidOperation error is thrown stating the component s id is missing The error causing code is shown in Listing 44
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Listing 44 Component id Is Missing
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var newComponent = SysComponentcreate( MyComponent, null, null, null, null); // causes an invalidOperation error SysApplicationaddComponent(newComponent);
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Second, if the id is set, but a component is already registered with the same id, an invalidOperation error is thrown stating a component is already registered with that id, as shown in Listing 45
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Listing 45 Component id Is Already Defined
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var newComponent = $create( MyComponent, null, null, null, null); newComponentset_id("MyNewComponent"); SysApplicationaddComponent(newComponent); var myOtherComponent =
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SysComponentcreate( MyComponent, null, null, null, null); myOtherComponentset_id("MyNewComponent"); // causes an invalidOperation error SysApplicationaddComponent(myOtherComponent);
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If the ID is set and another component is not already registered using that ID, the component is added to the internal _components member
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Delaying the Addition of a Component to SysApplication s Managed Components
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Every once in a while, you ll come across a situation where you don t want the component to be added to SysApplication s list of managed components right away For whatever reason, you want to create a component, manipulate it or use it in some way, and then add it to SysApplication s list of managed components By not setting the component s ID when you create it, you can cause the component to not be added to SysApplication s object of managed components automatically Then, whenever you re ready you can set its ID and add it to the component s list through addComponent This process, unfortunately, does not work for controls or behaviors because their component ID is automatically determined based upon their associated element s ID
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Finding a Component After we have registered a component, we can use the findComponent method to retrieve it so that a method can be called on it, so that it can be removed from the application, or for some other application-speci c reason Listing 46 demonstrates a findComponent call
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4: SysApplication
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Listing 46 findComponent Call
$create( MyComponent, {id: "MyNewComponent"}, null, null, null); var myNewComponent = SysApplicationfindComponent("MyNewComponent"); alert (myComponentget_id());
NOTE
$find
Because nding a component by ID is so common, the Microsoft AJAX Library provides a shortcut method name, $find, which points to SysApplicationfindComponent We ll use $find almost exclusively
Finding a component is done by passing the component s ID into the find method If the component is found, it is returned by the method; if it isn t found, null is returned
Alternative Uses of $find
In all the code examples to this point, we ve used the $find method to find a component registered within SysApplication Although this is by far the most common usage, the $find method can be used in two other ways The first alternative use is to find a component within any object that implements the SysIContainer interface This is similar to how we ve used the $find method already, except that rather than default to finding a component within SysApplication, which implements Sys
IContainer, we specify a different parent object that implements Sys IContainer We can do this by passing in a second parameter to our $find method call The following code details how we might use the $find
method in this way: