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delite/migration

Migrating from dijit and dojox/mobile to delite

Notes for applications

  1. In markup, widgets look like <d-star-rating foo=bar> rather than <div data-dojo-type=delite/StarRating data-dojo-props="foo: bar">.
  2. Widgets are parsed automatically without needing a parseOnLoad:true flag. But there's no auto-loading or data-dojo-mixins.
  3. Since each widget defines and loads its own CSS, you don't need to manually include dijit.css or claro.css; also, the theme is determined automatically so you don't need to add class="claro" to the <body> node.
  4. In dijit you could alter when the "change" event fired by setting the intermediateChanges flag to true or false. In delite, there are two separate events: "input" and "change". Listen to the "input" event to get notifications as the user is changing the value (for example, as the user is dragging the slider), and listen to the "change" event to get a notification when the user has finished changing the value (for example, mouseup on a slider). Also note that the "change" and "input" events only fire when the user changes the value, not when the value is changed programatically.

Notes for widget authors

dcl()

dojo.declare() is replaced by dcl(). Its usage is similar except for super calls. Rather than using this.inherited(), you use dcl.superCall(). So instead of:

_inZeroSettingArea: function(/*Number*/ x, /*Number*/ domNodeWidth){
	if(this.isLeftToRight()){
		return this.inherited(arguments);
	}else{
		return x > (domNodeWidth - this.zeroAreaWidth);
	}
}

You would do:

_inZeroSettingArea: dcl.superCall(function(sup){
	return function(/*Number*/ x, /*Number*/ domNodeWidth){
		if(this.effectiveDir === "ltr"){
			return sup.call(this, x, domNodeWidth);
		}else{
			return x > (domNodeWidth - this.zeroAreaWidth);
		}
	};
})

Often though it's simpler than this. Many widget methods are automatically chained. So a V1 postCreate() method like:

postCreate: function(){
    this.inherited(arguments);
    ... do stuff ...
}

can (and should) be replaced by:

postRender: function(){
    ... do stuff ...
}

Note also that dcl does have an this.inherited() type feature. However, it's not recommended because:

  1. this.inherited() will run slower than dcl.superCall() because it resolves at runtime rather than declare time
  2. it's easier to step through super calls in the debugger when using dcl.superCall().

register()

Widgets are declared via register() rather than dojo.declare(), and must extend HTMLElement; see the documentation for register() for details

this

this points to the widget's root node. this.srcNodeRef and this.domNode both replaced by this; for example this.className = "myButton"

lifecycle methods

  1. create() renamed to constructor()
  2. postscript() no longer runs; preCreate() was renamed to preRender().
  3. The buildRendering() method has been renamed to render(). It must not try to create the root DOMNode; it already exists. It should just set attributes on the root node, and create sub nodes and/or text inside the root node. However, usually widgets will not redefine render() at all, but rather just define the template property.
  4. There's no postMixInProperties() method any more. There is one called preRender() that runs before rendering.
  5. postCreate() renamed to postRender()
  6. The widget initialization parameters are not applied until after render() and postRender() complete.
  7. Custom setters still exist, but often its preferable to recompute property values in computeProperties() and to redraw the widget in refreshRendering(). Both these methods are called asynchronously after a batch of property changes.

templates

_TemplatedMixin is replaced by the handlebars! plugin, see that page for details.

i18n

Resources are loaded through i18n! plugin rather than a loadResource() type method.

CSS

A widget should use delite/theme! or requirejs-dplugins/css! to load its own CSS.

Further, delite/CssState (previously called dijit/_CssStateMixin) no longer sets CSS classes for hover, focus or active, so the widget CSS should just use the :focus, :hover, and :active pseudo-classes.

popups / dropdowns

HasDropDown now forwards keystrokes to popups by emitting the "keydown" event on the popup rather than calling a handleKey() method.

Dropdowns should indicate they have executed/canceled by calling this.emit("execute"), this.emit("change"), or this.emit("cancel"), rather than calling onExecute(), onChange(), or onCancel().

Dropdowns don't automatically get overflow: auto CSS but they should take some measure, perhaps by extending delite/Scrollable, to display a scrollbar when their size is reduced.

KeyNav

_KeyNavMixin has been renamed to KeyNav.

The _keyNavCodes property has been removed as KeyNav now figures out the method name to call automatically. However, the method names for arrows have been changed:

  • onLeftArrow --> previousKeyHandler
  • onRightArrow --> nextKeyHandler
  • onDownArrow --> downKeyHandler
  • onUpArrow --> upKeyHandler

Methods for handling other keys (like SPACE or ENTER) are similarly named, ex: spaceKeyHandler() and enterKeyHandler().

onFocus() and onBlur()

delite/activationTracker (previously called dijit/focus) no longer calls onFocus() and onBlur() (or _onFocus() and _onBlur()) methods on a widget. Rather, it emits delite-activated and delite-deactivated events on the widget.

Note that most widgets should probably just call this.on("focusin", ...) and this.on("focusout", ...) rather than depending on delite/activationTracker. It's mainly for popups.