Conceptually, a control differs from a behavior in the sense that instead of just providing client functionality, a control usually represents or wraps the element, to provide additional properties and methods that extend its programming interface.
Type.registerNamespace('Samples'); Samples.EmptyControl = function(element) { Samples.EmptyControl.initializeBase(this, [element]); } Samples.EmptyControl.prototype = { initialize : function() { Samples.EmptyControl.callBaseMethod(this, 'initialize'); }, dispose : function() { Samples.EmptyControl.callBaseMethod(this, 'dispose'); } } Samples.EmptyControl.registerClass('Samples.EmptyControl', Sys.UI.Control); //creating controls $create(Samples.EmptyControl, {}, {}, {}, $get('elementID'));
Because controls are client components, you can access them with the $find method. However, the Id of control can't be set programatically. It is automatically set by the SysUI.Control calss to the same ID as the associated element. You can get a reference to the control by passing the ID of the associated DOM element to $find. Another way to access a control is through the associated element. Because an element can have one or only one associated control, a property called "control", which stores the reference to the control - is created on the DOM element when the control is initialized. Supposing that you have a DOM element stored in the someElement variable, the following statement accesses the associated control arne stores a reference in the controlInstance variable.
var controlInstance = someElement.control;
Below is textbox control's implementation code
Type.registerNamespace('Samples'); // Samples.TextBox class. Samples.TextBox = function(element) { Samples.TextBox.initializeBase(this, [element]); this._ignoreEnterKey = false; } Samples.TextBox.prototype = { // Component lifecycle. initialize : function() { Samples.TextBox.callBaseMethod(this, 'initialize'); // Subscribe to the keypress event. $addHandlers(this.get_element(), {keypress:this._onKeyPress}, this); }, dispose : function() { // Detach event handlers. $clearHandlers(this.get_element()); Samples.TextBox.callBaseMethod(this, 'dispose'); }, // Handle the keypress event. _onKeyPress : function(evt) { if(this._ignoreEnterKey && evt.charCode == 13) { evt.preventDefault(); } }, // Properties. get_ignoreEnterKey : function() { return this._ignoreEnterKey; }, set_ignoreEnterKey : function(value) { this._ignoreEnterKey = value; } } Samples.TextBox.registerClass('Samples.TextBox', Sys.UI.Control); //at the client side Sys.Application.add_init(pageInit); function pageInit() { $create(Samples.TextBox, {'ignoreEnterKey':true}, {}, {}, $get('myTextBox')); }
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