Property in Java

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Table 61 Property
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id class style title srcNodeRef domNode
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Key Properties of dijit_Widget Object Description
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This is a unique identifier for the widget that can be assigned by Dojo or by the developer HTML class attribute HTML style attribute HTML title attribute Reference to the DOM element in the page associated with this widget prior to processing by the Dojo parser This is the root-level DOM element representing this widget This is the node that is added to the DOM This node may exist without actually yet being associated with the DOM
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Table 62 shows some of the methods in dijit_Widget
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63 Components of a Dojo Widget
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Table 62 Method
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create
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Key Methods of dijit_Widget Object Description
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This function creates the widget This is a stub function that you can override to modify take actions after the widget has been placed in the DOM There is no requirement to call this function This is a life-cycle function that can be called after the all the widget s children have been created but not yet displayed This is a stub function containing no code There is no requirement to call this function This is a life-cycle function that can be used to override properties in the widget It is a stub function containing no code There is no requirement to call this function This function actually creates a DOM element for the widget This function can also be overridden by code in the dijit_Templated object, which builds the DOM element from a template of HTML code This function does not add the element to the DOM for the page Destroy this widget and its descendants This function returns all the children of this widget This function is used to associate an event handler with a function within the widget This function is used to remove an event handler from the widget It is the reverse of connect
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postCreate
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startup
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postMixInProperties
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buildRendering
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destroyRecursive getDescendants connect disconnect
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It isn t enough just to know what methods are available in dijit_WidgetWe also need to know when they are called and how In other words, what are the lifecycle methods for each and every widget Fortunately for us, it is pretty easy to create a good idea of the important methods by looking at the create method for WidgetThis is the method that is called when a widget is created, either by the parser as it works through the HTML or by the constructor function of the widget we are building programmatically Following is the main code from the create methodThe code has been reformatted and some additional comments added to further explain the comments you have read in these sections
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//mixin our passed parameters if(thissrcNodeRef && (typeof thissrcNodeRefid == "string")){ thisid = thissrcNodeRefid; }
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6
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Introduction to Dojo Widgets
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if(params){ dojomixin(this,params); } thispostMixInProperties(); if(!thisid){ thisid=dijitgetUniqueId(thisdeclaredClassreplace(/\/g,"_")); } dijitregistryadd(this); thisbuildRendering(); // Copy attributes listed in attributeMap into // the [newly created] DOM for the widget if(thisdomNode){ thisdomNodesetAttribute("widgetId", thisid); } thispostCreate(); // If srcNodeRef has been processed and removed // from the DOM (eg TemplatedWidget) then delete it to allow GC if(thissrcNodeRef && !thissrcNodeRefparentNode){ delete thissrcNodeRef; }
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Let s walk through each section and describe the key processing steps
Table 63
Key Methods Called as Processing Steps During Widget Creation
A stub function that you can override to modify variables that may have been naively assigned by the mixInProperties# widget is added to the manager object here Method which performs UI initialization including attachment of additional DOM nodes to the root DOM element for the widget A stub function that you can override to modify take actions after the widget has been placed in the UI
postMixInProperties:
buildRendering
postCreate
63 Components of a Dojo Widget
6342 dijit_Templated This is an interesting class from which many widgets descend I think of it like an interface in JavaThis provides special properties and methods that allow a widget to be created from a template (a string of HTML) rather than instantiated programmatically
635 Visual Overview of Dojo Widgets
At this point it would be useful to see some of the widgetsThis will give you a good idea of the breadth of the Dojo widget setThe widgets are divided into general categories that correspond to the way the widgets are packaged Most of these widgets have numerous properties that can be set to enable additional functionalityWe only show the simplest version of each widget just to give you an idea of what they doWe drill down into each widget in subsequent chapters and see their full power Many of these examples are modified versions of test pages available in the Dojo distribution directory at dijit/tests 6351 Form and Data Widgets These widgets appear in the form packageTheir basic purpose is to display some data and provide the user with a way of modifying that data that is appropriate for the data type