Future base class for all Dijit widgets.
Future base class for all Dijit widgets. _Widget extends this class adding support for various features needed by desktop.
Provides stubs for widget lifecycle methods for subclasses to extend, like postMixInProperties(), buildRendering(), postCreate(), startup(), and destroy(), and also public API methods like set(), get(), and watch().
Widgets can provide custom setters/getters for widget attributes, which are called automatically by set(name, value). For an attribute XXX, define methods _setXXXAttr() and/or _getXXXAttr().
_setXXXAttr can also be a string/hash/array mapping from a widget attribute XXX to the widget's DOMNodes:
DOM node attribute
_setFocusAttr: {node: "focusNode", type: "attribute"} _setFocusAttr: "focusNode" (shorthand) _setFocusAttr: "" (shorthand, maps to this.domNode) Maps this.focus to this.focusNode.focus, or (last example) this.domNode.focus
DOM node innerHTML
_setTitleAttr: { node: "titleNode", type: "innerHTML" } Maps this.title to this.titleNode.innerHTML
DOM node innerText
_setTitleAttr: { node: "titleNode", type: "innerText" } Maps this.title to this.titleNode.innerText
DOM node CSS class
_setMyClassAttr: { node: "domNode", type: "class" } Maps this.myClass to this.domNode.className
If the value of _setXXXAttr is an array, then each element in the array matches one of the formats of the above list.
If the custom setter is null, no action is performed other than saving the new value in the widget (in this).
If no custom setter is defined for an attribute, then it will be copied to this.focusNode (if the widget defines a focusNode), or this.domNode otherwise. That's only done though for attributes that match DOMNode attributes (title, alt, aria-labelledby, etc.)
Parameter | Type | Description |
---|---|---|
params | Object | null | Hash of initialization parameters for widget, including scalar values (like title, duration etc.) and functions, typically callbacks like onClick. The hash can contain any of the widget's properties, excluding read-only properties. |
srcNodeRef | DOMNode | String |
Optional If a srcNodeRef (DOM node) is specified:
|
See the dijit/_WidgetBase reference documentation for more information.
Path to a blank 1x1 image.
Used by <img>
nodes in templates that really get their image via CSS background-image.
Deprecated. Instead of attributeMap, widget should have a _setXXXAttr attribute for each XXX attribute to be mapped to the DOM.
attributeMap sets up a "binding" between attributes (aka properties) of the widget and the widget's DOM. Changes to widget attributes listed in attributeMap will be reflected into the DOM.
For example, calling set('title', 'hello') on a TitlePane will automatically cause the TitlePane's DOM to update with the new title.
attributeMap is a hash where the key is an attribute of the widget, and the value reflects a binding to a:
DOM node attribute
focus: {node: "focusNode", type: "attribute"} Maps this.focus to this.focusNode.focus
DOM node innerHTML
title: { node: "titleNode", type: "innerHTML" } Maps this.title to this.titleNode.innerHTML
DOM node innerText
title: { node: "titleNode", type: "innerText" } Maps this.title to this.titleNode.innerText
DOM node CSS class
myClass: { node: "domNode", type: "class" } Maps this.myClass to this.domNode.className
If the value is an array, then each element in the array matches one of the formats of the above list.
There are also some shorthands for backwards compatibility:
"focusNode" ---> { node: "focusNode", type: "attribute" }
Root CSS class of the widget (ex: dijitTextBox), used to construct CSS classes to indicate widget state.
Designates where children of the source DOM node will be placed. "Children" in this case refers to both DOM nodes and widgets. For example, for myWidget:
<div data-dojo-type=myWidget> <b> here's a plain DOM node <span data-dojo-type=subWidget>and a widget</span> <i> and another plain DOM node </i> </div>
containerNode would point to:
<b> here's a plain DOM node <span data-dojo-type=subWidget>and a widget</span> <i> and another plain DOM node </i>
In templated widgets, "containerNode" is set via a data-dojo-attach-point assignment.
containerNode must be defined for any widget that accepts innerHTML (like ContentPane or BorderContainer or even Button), and conversely is null for widgets that don't, like TextBox.
Bi-directional support, as defined by the HTML DIR attribute. Either left-to-right "ltr" or right-to-left "rtl". If undefined, widgets renders in page's default direction.
This is our visible representation of the widget! Other DOM Nodes may by assigned to other properties, usually through the template system's data-dojo-attach-point syntax, but the domNode property is the canonical "top level" node in widget UI.
This widget or a widget it contains has focus, or is "active" because it was recently clicked.
A unique, opaque ID string that can be assigned by users or by the system. If the developer passes an ID which is known not to be unique, the specified ID is ignored and the system-generated ID is used instead.
The document this widget belongs to. If not specified to constructor, will default to srcNodeRef.ownerDocument, or if no sourceRef specified, then to the document global
HTML title attribute.
For form widgets this specifies a tooltip to display when hovering over the widget (just like the native HTML title attribute).
For TitlePane or for when this widget is a child of a TabContainer, AccordionContainer, etc., it's used to specify the tab label, accordion pane title, etc. In this case it's interpreted as HTML.
When this widget's title attribute is used to for a tab label, accordion pane title, etc., this specifies the tooltip to appear when the mouse is hovered over that text.
Step during widget creation to copy widget attributes to the DOM according to attributeMap and _setXXXAttr objects, and also to call custom _setXXXAttr() methods.
Skips over blank/false attribute values, unless they were explicitly specified as parameters to the widget, since those are the default anyway, and setting tabIndex="" is different than not setting tabIndex at all.
For backwards-compatibility reasons attributeMap overrides _setXXXAttr when _setXXXAttr is a hash/string/array, but _setXXXAttr as a functions override attributeMap.
Reflect a widget attribute (title, tabIndex, duration etc.) to the widget DOM, as specified by commands parameter. If commands isn't specified then it's looked up from attributeMap. Note some attributes like "type" cannot be processed this way as they are not mutable.
Parameter | Type | Description |
---|---|---|
attr | String | Name of member variable (ex: "focusNode" maps to this.focusNode) pointing to DOMNode inside the widget, or alternately pointing to a subwidget |
value | String | |
commands | Object |
Optional
|
Internal helper for directly changing an attribute value.
Directly change the value of an attribute on an object, bypassing any accessor setter. Also handles the calling of watch and emitting events. It is designed to be used by descendant class when there are two values of attributes that are linked, but calling .set() is not appropriate.
Parameter | Type | Description |
---|---|---|
name | String | The property to set. |
value | Mixed | The value to set in the property. |
Internal helper for directly changing an attribute value.
Helper function to get value for specified property stored by this._set(), i.e. for properties with custom setters. Used mainly by custom getters.
For example, CheckBox._getValueAttr() calls this._get("value").
Parameter | Type | Description |
---|---|---|
name | String |
Helper function for get() and set(). Caches attribute name values so we don't do the string ops every time.
Parameter | Type | Description |
---|---|---|
name | undefined |
Collect metadata about this widget (only once per class, not once per instance):
- list of attributes with custom setters, storing in this.constructor._setterAttrs - generate this.constructor._onMap, mapping names like "mousedown" to functions like onMouseDown
Helper function to set new value for specified property, and call handlers registered with watch() if the value has changed.
Parameter | Type | Description |
---|---|---|
name | String | |
value | anything |
Sets the style attribute of the widget according to value, which is either a hash like {height: "5px", width: "3px"} or a plain string
Determines which node to set the style on based on style setting in attributeMap.
Parameter | Type | Description |
---|---|---|
value | String | Object |
Parameter | Type | Description |
---|---|---|
value | undefined |
Construct the UI for this widget, setting this.domNode.
Most widgets will mixin dijit._TemplatedMixin
, which implements this method.
Deprecated, will be removed in 2.0, use this.own(on(...)) or this.own(aspect.after(...)) instead.
Connects specified obj/event to specified method of this object and registers for disconnect() on widget destroy.
Provide widget-specific analog to dojo.connect, except with the
implicit use of this widget as the target object.
Events connected with this.connect
are disconnected upon
destruction.
Parameter | Type | Description |
---|---|---|
obj | Object | null | |
event | String | Function | |
method | String | Function |
A handle that can be passed to disconnect
in order to disconnect before
the widget is destroyed.
var btn = new Button(); // when foo.bar() is called, call the listener we're going to // provide in the scope of btn btn.connect(foo, "bar", function(){ console.debug(this.toString()); });
Kick off the life-cycle of a widget
Create calls a number of widget methods (postMixInProperties, buildRendering, postCreate, etc.), some of which of you'll want to override. See http://dojotoolkit.org/reference-guide/dijit/_WidgetBase.html for a discussion of the widget creation lifecycle.
Of course, adventurous developers could override create entirely, but this should only be done as a last resort.
Parameter | Type | Description |
---|---|---|
params | Object | null | Hash of initialization parameters for widget, including scalar values (like title, duration etc.) and functions, typically callbacks like onClick. The hash can contain any of the widget's properties, excluding read-only properties. |
srcNodeRef | DOMNode | String |
Optional If a srcNodeRef (DOM node) is specified:
|
Wrapper to setTimeout to avoid deferred functions executing after the originating widget has been destroyed. Returns an object handle with a remove method (that returns null) (replaces clearTimeout).
Parameter | Type | Description |
---|---|---|
fcn | Function | Function reference. |
delay | Number |
Optional Delay, defaults to 0. |
Destroy this widget, but not its descendants. Descendants means widgets inside of this.containerNode. Will also destroy any resources (including widgets) registered via this.own().
This method will also destroy internal widgets such as those created from a template, assuming those widgets exist inside of this.domNode but outside of this.containerNode.
For 2.0 it's planned that this method will also destroy descendant widgets, so apps should not depend on the current ability to destroy a widget without destroying its descendants. Generally they should use destroyRecursive() for widgets with children.
Parameter | Type | Description |
---|---|---|
preserveDom | Boolean | If true, this method will leave the original DOM structure alone. Note: This will not yet work with _TemplatedMixin widgets |
Recursively destroy the children of this widget and their descendants.
Parameter | Type | Description |
---|---|---|
preserveDom | Boolean |
Optional If true, the preserveDom attribute is passed to all descendant widget's .destroy() method. Not for use with _Templated widgets. |
Destroy this widget and its descendants
This is the generic "destructor" function that all widget users should call to cleanly discard with a widget. Once a widget is destroyed, it is removed from the manager object.
Parameter | Type | Description |
---|---|---|
preserveDom | Boolean |
Optional If true, this method will leave the original DOM structure alone of descendant Widgets. Note: This will NOT work with dijit._TemplatedMixin widgets. |
Destroys the DOM nodes associated with this widget.
Parameter | Type | Description |
---|---|---|
preserveDom | Boolean |
Optional If true, this method will leave the original DOM structure alone during tear-down. Note: this will not work with _Templated widgets yet. |
Deprecated, will be removed in 2.0, use handle.remove() instead.
Disconnects handle created by connect
.
Parameter | Type | Description |
---|---|---|
handle | undefined |
Used by widgets to signal that a synthetic event occurred, ex:
myWidget.emit("attrmodified-selectedChildWidget", {}).
Emits an event on this.domNode named type.toLowerCase(), based on eventObj. Also calls onType() method, if present, and returns value from that method. By default passes eventObj to callback, but will pass callbackArgs instead, if specified. Modifies eventObj by adding missing parameters (bubbles, cancelable, widget).
Parameter | Type | Description |
---|---|---|
type | String | |
eventObj | Object |
Optional
|
callbackArgs | Array |
Optional
|
Get a property from a widget.
Get a named property from a widget. The property may potentially be retrieved via a getter method. If no getter is defined, this just retrieves the object's property.
For example, if the widget has properties foo
and bar
and a method named _getFooAttr()
, calling:
myWidget.get("foo")
would be equivalent to calling
widget._getFooAttr()
and myWidget.get("bar")
would be equivalent to the expression
widget.bar2
Parameter | Type | Description |
---|---|---|
name | undefined | The property to get. |
Returns all direct children of this widget, i.e. all widgets underneath this.containerNode whose parent is this widget. Note that it does not return all descendants, but rather just direct children. Analogous to Node.childNodes, except containing widgets rather than DOMNodes.
The result intentionally excludes internally created widgets (a.k.a. supporting widgets) outside of this.containerNode.
Note that the array returned is a simple array. Application code should not assume existence of methods like forEach().
Return true if this widget can currently be focused and false if not
Return this widget's explicit or implicit orientation (true for LTR, false for RTL)
Call specified function when event occurs, ex: myWidget.on("click", function(){ ... }).
Call specified function when event type
occurs, ex: myWidget.on("click", function(){ ... })
.
Note that the function is not run in any particular scope, so if (for example) you want it to run in the
widget's scope you must do myWidget.on("click", lang.hitch(myWidget, func))
.
Parameter | Type | Description |
---|---|---|
type | String | Function | Name of event (ex: "click") or extension event like touch.press. |
func | Function |
Track specified handles and remove/destroy them when this instance is destroyed, unless they were already removed/destroyed manually.
The array of specified handles, so you can do for example:
var handle = this.own(on(...))[0];
Place this widget somewhere in the DOM based on standard domConstruct.place() conventions.
A convenience function provided in all _Widgets, providing a simple shorthand mechanism to put an existing (or newly created) Widget somewhere in the dom, and allow chaining.
Parameter | Type | Description |
---|---|---|
reference | String | DomNode | DocumentFragment | dijit/_WidgetBase | Widget, DOMNode, DocumentFragment, or id of widget or DOMNode |
position | String | Int |
Optional If reference is a widget (or id of widget), and that widget has an ".addChild" method, it will be called passing this widget instance into that method, supplying the optional position index passed. In this case position (if specified) should be an integer. If reference is a DOMNode (or id matching a DOMNode but not a widget), the position argument can be a numeric index or a string "first", "last", "before", or "after", same as dojo/dom-construct::place(). |
Provides a useful return of the newly created dijit._Widget instance so you can "chain" this function by instantiating, placing, then saving the return value to a variable.
// create a Button with no srcNodeRef, and place it in the body: var button = new Button({ label:"click" }).placeAt(win.body()); // now, 'button' is still the widget reference to the newly created button button.on("click", function(e){ console.log('click'); }));
// create a button out of a node with id="src" and append it to id="wrapper": var button = new Button({},"src").placeAt("wrapper");
// place a new button as the first element of some div var button = new Button({ label:"click" }).placeAt("wrapper","first");
// create a contentpane and add it to a TabContainer var tc = dijit.byId("myTabs"); new ContentPane({ href:"foo.html", title:"Wow!" }).placeAt(tc)
Processing after the DOM fragment is created
Called after the DOM fragment has been created, but not necessarily added to the document. Do not include any operations which rely on node dimensions or placement.
Called after the parameters to the widget have been read-in, but before the widget template is instantiated. Especially useful to set properties that are referenced in the widget template.
Kicks off widget instantiation. See create() for details.
Parameter | Type | Description |
---|---|---|
params | Object |
Optional
|
srcNodeRef | DomNode | String |
Set a property on a widget
Sets named properties on a widget which may potentially be handled by a setter in the widget.
For example, if the widget has properties foo
and bar
and a method named _setFooAttr()
, calling
myWidget.set("foo", "Howdy!")
would be equivalent to calling
widget._setFooAttr("Howdy!")
and myWidget.set("bar", 3)
would be equivalent to the statement widget.bar = 3;
set() may also be called with a hash of name/value pairs, ex:
myWidget.set({ foo: "Howdy", bar: 3 });
This is equivalent to calling set(foo, "Howdy")
and set(bar, 3)
Parameter | Type | Description |
---|---|---|
name | undefined | The property to set. |
value | undefined | The value to set in the property. |
Set a property on a widget
Processing after the DOM fragment is added to the document
Called after a widget and its children have been created and added to the page, and all related widgets have finished their create() cycle, up through postCreate().
Note that startup() may be called while the widget is still hidden, for example if the widget is inside a hidden dijit/Dialog or an unselected tab of a dijit/layout/TabContainer. For widgets that need to do layout, it's best to put that layout code inside resize(), and then extend dijit/layout/_LayoutWidget so that resize() is called when the widget is visible.
Deprecated, will be removed in 2.0, use this.own(topic.subscribe()) instead.
Subscribes to the specified topic and calls the specified method of this object and registers for unsubscribe() on widget destroy.
Provide widget-specific analog to dojo.subscribe, except with the implicit use of this widget as the target object.
Parameter | Type | Description |
---|---|---|
t | String | The topic |
method | Function | The callback |
var btn = new Button(); // when /my/topic is published, this button changes its label to // be the parameter of the topic. btn.subscribe("/my/topic", function(v){ this.set("label", v); });
Returns a string that represents the widget.
When a widget is cast to a string, this method will be used to generate the output. Currently, it does not implement any sort of reversible serialization.
Deprecated. Override destroy() instead to implement custom widget tear-down behavior.
Deprecated, will be removed in 2.0, use handle.remove() instead.
Unsubscribes handle created by this.subscribe. Also removes handle from this widget's list of subscriptions
Parameter | Type | Description |
---|---|---|
handle | Object |
Watches a property for changes
Parameter | Type | Description |
---|---|---|
name | String |
Optional Indicates the property to watch. This is optional (the callback may be the only parameter), and if omitted, all the properties will be watched |
callback | Function | The function to execute when the property changes. This will be called after the property has been changed. The callback will be called with the |this| set to the instance, the first argument as the name of the property, the second argument as the old value and the third argument as the new value. |
An object handle for the watch. The unwatch method of this object can be used to discontinue watching this property:
var watchHandle = obj.watch("foo", callback); watchHandle.unwatch(); // callback won't be called now
This is where widgets do processing for when they stop being active, such as changing CSS classes. See onBlur() for more details.
var btn = new Button(); // when /my/topic is published, this button changes its label to // be the parameter of the topic. btn.subscribe("/my/topic", function(v){ this.set("label", v); });
This is where widgets do processing for when they are active, such as changing CSS classes. See onFocus() for more details.
var btn = new Button(); // when /my/topic is published, this button changes its label to // be the parameter of the topic. btn.subscribe("/my/topic", function(v){ this.set("label", v); });
Maps on() type parameter (ex: "mousemove") to method name (ex: "onMouseMove"). If type is a synthetic event like touch.press then returns undefined.
Parameter | Type | Description |
---|---|---|
type | String | Function |
var btn = new Button(); // when /my/topic is published, this button changes its label to // be the parameter of the topic. btn.subscribe("/my/topic", function(v){ this.set("label", v); });
Called when the widget stops being "active" because focus moved to something outside of it, or the user clicked somewhere outside of it, or the widget was hidden.
var btn = new Button(); // when /my/topic is published, this button changes its label to // be the parameter of the topic. btn.subscribe("/my/topic", function(v){ this.set("label", v); });
Called when the widget becomes "active" because it or a widget inside of it either has focus, or has recently been clicked.
var btn = new Button(); // when /my/topic is published, this button changes its label to // be the parameter of the topic. btn.subscribe("/my/topic", function(v){ this.set("label", v); });