Controls Using the element Parameter in VS .NET

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Controls Using the element Parameter
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The last parameter of the $create method is element, which is used as a pointer to a DOM element Because the element parameter is valid only when we re creating a new behavior or a new control, we cover the element parameter when we cover de ning and creating those types
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Wrapping Up Components A component is not just de ned as an object that inherits from Sys Component, but also as being managed by SysApplication Creating an instance of a type that inherits from SysComponent using the new keyword will not automatically register the instance with SysApplication We have to use the $create method for this to happen Using $create also facilitates setting properties, wiring up event handlers, assigning references to other components, and associating it with a DOM element, as we see with controls and behaviors It also automatically calls the initialize method on the component, enabling you to create user-de ned code that executes after all the properties have been set, event handlers added, and component references assigned
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Controls
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A control is a special type of component directly associated to a DOM element A DOM element can have only one associated control, and a control must be associated to a DOM element In practical terms, because we can have only one control associated to a given DOM element, their use is intended for situations where you want to have full power over the DOM element In those cases where you re not sure whether that s your intention, start off with a behavior, and then move to a control if needed In reality, switching back and forth between a control and a behavior is not too dif cult and doesn t require too much code to be altered Because a control is directly tied to a DOM element, it has methods that are useful for accessing and manipulating the associated DOM element Table 35 details the methods available to a control that access and manipulate the associated DOM element
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Table 35 SysUIControl Methods Method Name set_id Description Syntax no valid usage
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set_id method Throws
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an error because a control s id is always the associated DOM element s id
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get_id
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get_id method Returns the id of the associated
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return ctrlget_id();
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DOM element
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get_visible
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Returns the value returned return ctrlget_visible(); by calling SysUI
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DOMElementgetVisible
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on the associated DOM element
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set_visible
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Calls SysUIDomElement ctrlset_ setVisible using the visible(visibility); control s associated DOM element and the Boolean value passed into the set_visible call
get_visibilityMode Calls SysUIDomElement return ctrlget_ getVisibilityMode using visibilityMode();
the control s associated DOM element
set_visibilityMode Calls SysUIDomElement ctrlset_visibilityMode( setVisibilityMode using SysUIVisibilityMode the control s associated ); DOM element and Sys UIVisibilityMode
parameter passed in to the set_visibilityMode call
get_element
Returns the associated DOM element
return ctrlget_ element();
Controls
Method Name addCssClass Description Syntax
Calls SysUIDomElement ctrladdCssClass addCssClass using the (cssClassName) control s associated DOM element and the name of the CSS class to add Calls SysUIDomElement ctrlremoveCssClass removeCssClass using the (cssClassName); control s associated DOM element and the name of the CSS class to remove Calls SysUIDomElement ctrltoggleCssClass toggleCssClass using the (cssClassName); control s associated DOM element and the name of the CSS class to toggle Overrides SysComponent s ctrldispose(); dispose Calls base class dispose, sets element s control expando property to undefined, and deletes reference to the DOM element from the component
removeCssClass
toggleCssClass
dispose
New Concepts Besides the methods that access and manipulate the associated DOM element, other methods introduce two new concepts: a control s parent and ASPNET-like event bubbling
Control s Parent
A control s parent property provides a pointer to another control The parent can be calculated in one of two ways If a parent has been explicitly set using the set_parent method, that is the control s parent If a parent has not been explicitly set, the control s associated DOM element s parentNode pointer is walked until an element with a control attached to it is reached, and that is considered the control s parent Table 36 details the methods involved with the parent pointer concept
3: Components
Table 36 SysUIControl Methods Related to Control s Parent Method Name get_parent Description Syntax var parent = ctrlget_parent();
Returns the explicitly set parent or the rst control encountered by walking up the DOM element s parentNode pointer Explicitly sets the parent