Mixin: module:delite/Selection

module:delite/Selection

Mixin for widgets that manage a list of selected data items.

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Extends

Show inherited

Members

<protected> attached :boolean

Set to true when attachedCallback() has completed, and false when detachedCallback() called.

Type:
  • boolean
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<protected> baseClass :string

Root CSS class of the widget (ex: "d-text-box")

Type:
  • string
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<protected> created :boolean

Set to true when createdCallback() has completed.

Type:
  • boolean
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dir :string

Controls the layout direction of the widget, for example whether the arrow of a Combobox appears to the right or the left of the input field.

Values are "ltr" and "rtl", or "" which means that the value is inherited from the setting on the document root (either <html> or <body>).

Type:
  • string
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<readonly> effectiveDir :string

Actual direction of the widget, which can be set explicitly via dir property or inherited from the setting on the document root (either <html> or <body>). Value is either "ltr" or "rtl".

Type:
  • string
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<protected> focused :boolean

This widget or a widget it contains has focus, or is "active" because it was recently clicked.

Type:
  • boolean
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Default Value:
  • false
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selectedItem :Object

In single selection mode, the selected item or in multiple selection mode the last selected item.

Type:
  • Object
Default Value:
  • null
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selectedItems :Array.<Object>

The list of selected items.

Type:
  • Array.<Object>
Default Value:
  • null
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selectionMode :string

The chosen selection mode.

Valid values are:

  1. "none": No selection can be done.
  2. "single": Only one or zero items can be selected at a time. Interactively selecting a new item deselects the previously selected one.
  3. "radio": Initially only one or zero items can be selected. Once an item has been selected, interactively selecting another item deselects the previously selected item, and the user cannot deselect the currently selected item.
  4. "multiple": Multiple items can be selected. By default ctrl key must be used to select additional items. However that behavior might be specialized by subclasses.

Changing this value impacts the current selected items to adapt the selection to the new mode. However whatever the selection mode is you can always set several selected items using the selectItem(s) API. The mode will be enforced only when using setSelected and/or selectFromEvent APIs.

Type:
  • string
Default Value:
  • "single"
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<protected> template :function

Value returned by delite/handlebars! or compatible template engine. Specifies how to build the widget DOM initially and also how to update the DOM when widget properties change.

Type:
  • function
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<protected, constant> widgetId :number

Unique id for this widget, separate from id attribute (which may or may not be set). Useful when widget creates subnodes that need unique id's.

Type:
  • number
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Methods

<protected> _get(name) → {*}

Internal helper for directly accessing an attribute value.

Directly gets the value of an attribute on an object, bypassing any accessor getter. It is designed to be used by descendant class if they want to access the value in their custom getter before returning it.

Parameters:
Name Type Description
name string

Name of property.
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Returns:

Value of property.

Type
*

<protected> _set(name, value)

Internal helper for directly setting a property value without calling the custom setter.

Directly changes the value of an attribute on an object, bypassing any accessor setter. Also notifies callbacks registered via observe(). Custom setters should call _set to actually record the new value.

Parameters:
Name Type Description
name string

The property to set.
value *

Value to set the property to.
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attachedCallback()

Called automatically when the element is added to the document, after createdCallback() completes. This method is automatically chained, so subclasses generally do not need to use dcl.superCall(), dcl.advise(), etc.

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computeProperties(oldValues, isAfterCreation)

Callback function to calculate computed properties upon property changes.

Parameters:
Name Type Description
oldValues Object

The hash table of old property values, keyed by property names.
isAfterCreation boolean

True if this call is right after instantiation.
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<protected> createdCallback()

Called when the custom element is created, or when register.parse() parses a custom tag.

This method is automatically chained, so subclasses generally do not need to use dcl.superCall(), dcl.advise(), etc.

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<protected> defer(fcn, delay) → {Object}

Wrapper to setTimeout to avoid deferred functions executing after the originating widget has been destroyed.

Parameters:
Name Type Description
fcn function

Function to be executed after specified delay (or 0ms if no delay specified).
delay number

Delay in ms, defaults to 0.
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Returns:

Handle with a remove method that deschedules the callback from being called.

Type
Object

deliver()

Synchronously deliver change records to all listeners registered via observe().

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deliverComputing()

Synchronously deliver change records for computed properties so that computeProperties() is called if there are pending change records.

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destroy()

Release resources used by this custom element and its descendants. After calling this method, the element can no longer be used, and should be removed from the document.

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detachedCallback()

Called when the element is removed the document. This method is automatically chained, so subclasses generally do not need to use dcl.superCall(), dcl.advise(), etc.

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discardChanges()

Discard change records for all listeners registered via observe().

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discardComputing()

Discard change records for computed properties.

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<protected> dispatchSelectionChange(oldSelectedItem, newSelectedItem, renderer, triggerEvent)

Dispatch a selection change event.

Parameters:
Name Type Description
oldSelectedItem Object

The previously selected item.
newSelectedItem Object

The new selected item.
renderer Object

The visual renderer of the selected/deselected item.
triggerEvent Event

The event that lead to the selection of the item.
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Fires:

<protected> emit(type, eventObj) → {boolean}

Emits a synthetic event of specified type, based on eventObj.

Parameters:
Name Type Argument Description
type string

Name of event.
eventObj Object <optional>

Properties to mix in to emitted event. Can also contain bubbles and cancelable properties to control how the event is emitted.
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Returns:

True if the event was not canceled, false if it was canceled.

Type
boolean
Example
myWidget.emit("query-success", {});

findCustomElements(root)

Search subtree under root returning custom elements found.

Parameters:
Name Type Argument Description
root Element <optional>

Node to search under.
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getEnclosingWidget(node)

Returns the widget whose DOM tree contains the specified DOMNode, or null if the node is not contained within the DOM tree of any widget

Parameters:
Name Type Description
node Element
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getIdentity(object) → {string}

This function must be implemented to return the id of a item.

Parameters:
Name Type Description
object item

The item the identity of must be returned.
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Returns:

The identity of the item.

Type
string

<protected> getInheritedDir() → {string}

Get the direction setting for the page itself.

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Returns:

"ltr" or "rtl"

Type
string

getParent()

Returns the parent widget of this widget, or null if there is no parent widget.

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<protected> getProps() → {Object}

Returns a hash of properties that should be observed.

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Returns:

Hash of properties.

Type
Object

<protected> getPropsToObserve() → {Array.<string>}

Get list of properties that Stateful#observe() should observe.

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Returns:

list of properties

Type
Array.<string>

<protected> hasSelectionModifier(event) → {boolean}

Tests if an event has a selection modifier.

If it has a selection modifier, that means that:

  • if selectionMode is "single", the event will be able to deselect a selected item
  • if selectionMode is "multiple", the event will trigger the selection state of the item

The default implementation of this method returns true if the event.ctrlKey attribute is true, which means that:

  • if selectionMode is "single", the Ctrl (or Command on MacOS) key must be pressed for the
  • event to deselect the currently selected item
  • if selectionMode is "multiple", the Ctrl (or Command on MacOS) key must be pressed for the event to toggle the selection status of the item.
Parameters:
Name Type Description
event Event

The event that led to the selection .
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Returns:

Whether the event has selection modifier.

Type
boolean

<protected> initializeInvalidating()

Make initial calls to computeProperties(), initializeRendering(), and refreshRendering(), and setup observers so those methods are called whenever properties are modified in the future. Normally this method is called automatically by the constructor, and should not be called manually, but the method is exposed for custom elements since they do not call the constructor() method.

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initializeRendering(oldValues)

Callback function to initialize rendering.

Parameters:
Name Type Description
oldValues Object

The hash table of old property values, keyed by property names.
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<protected> introspect(props)

Sets up ES5 getters/setters for each class property. Inside introspect(), "this" is a reference to the prototype rather than any individual instance.

Parameters:
Name Type Description
props Object

Hash of properties.
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isSelected(object) → {Object}

Returns whether an item is selected or not.

Parameters:
Name Type Description
object item

The item to test.
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Returns:

The item to test the selection for.

Type
Object

mix(hash)

Set a hash of properties on a Stateful instance.

Parameters:
Name Type Description
hash Object

Hash of properties.
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Example
myObj.mix({
    foo: "Howdy",
    bar: 3
});

notifyCurrentValue(name)

Notifies current values to observers for specified property name(s). Handy to manually schedule invocation of observer callbacks when there is no change in value.

Parameters:
Name Type Argument Description
name string <repeatable>

The property name.
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observe(callback) → {module:decor/Stateful.PropertyListObserver}

Observes for change in properties. Callback is called at the end of micro-task of changes with a hash table of old values keyed by changed property. Multiple changes to a property in a micro-task are squashed.

Parameters:
Name Type Description
callback function

The callback.
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Returns:

The observer that can be used to stop observation or synchronously deliver/discard pending change records.

Type
module:decor/Stateful.PropertyListObserver
Example
var stateful = new (dcl(Stateful, {
        foo: undefined,
        bar: undefined,
        baz: undefined
    }))({
        foo: 3,
        bar: 5,
        baz: 7
    });
stateful.observe(function (oldValues) {
    // oldValues is {foo: 3, bar: 5, baz: 7}
});
stateful.foo = 4;
stateful.bar = 6;
stateful.baz = 8;
stateful.foo = 6;
stateful.bar = 8;
stateful.baz = 10;

on(type, func, node) → {Object}

Call specified function when event occurs.

Note that the function is not run in any particular scope, so if (for example) you want it to run in the element's scope you must do myCustomElement.on("click", myCustomElement.func.bind(myCustomElement)).

Note that delite/Widget overrides on() so that on("focus", ...) and `on("blur", ...) will trigger the listener when focus moves into or out of the widget, rather than just when the widget's root node is focused/blurred. In other words, the listener is called when the widget is conceptually focused or blurred.

Parameters:
Name Type Argument Description
type string

Name of event (ex: "click").
func function

Callback function.
node Element <optional>

Element to attach handler to, defaults to this.
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Returns:

Handle with remove() method to cancel the event.

Type
Object

<protected> own() → {Array.<Object>}

Track specified handles and remove/destroy them when this instance is destroyed, unless they were already removed/destroyed manually.

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Returns:

The array of specified handles, so you can do for example: var handle = this.own(on(...))[0];

Type
Array.<Object>

<protected> parseAttribute(name, value)

Helper for parsing declarative widgets. Interpret a given attribute specified in markup, returning either:

  • undefined: ignore
  • {prop: prop, value: value}: set this[prop] = value
  • {event: event, callback: callback}: call this.on(event, callback)
Parameters:
Name Type Description
name string

Attribute name.
value string

Attribute value.
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<protected> parseFunctionAttribute(value, params)

Helper to parse function attribute in markup. Unlike _parsePrototypeAttr(), does not require a corresponding widget property. Functions can be specified as global variables or as inline javascript:

Parameters:
Name Type Description
value string

Value of the attribute.
params Array.<string>

When generating a function from inline javascript, give it these parameter names.
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<protected> placeAt(reference, position) → {module:delite/Widget}

Place this widget somewhere in the dom, and allow chaining.

Parameters:
Name Type Argument Description
reference string | Element | DocumentFragment

Element, DocumentFragment, or id of Element to place this widget relative to.
position string | number <optional>

Numeric index or a string with the values:

  • number - place this widget as n'th child of reference node
  • "first" - place this widget as first child of reference node
  • "last" - place this widget as last child of reference node
  • "before" - place this widget as previous sibling of reference node
  • "after" - place this widget as next sibling of reference node
  • "replace" - replace specified reference node with this widget
  • "only" - replace all children of reference node with this widget
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Returns:

This widget, for chaining.

Type
module:delite/Widget
Examples
// create a Button with no srcNodeRef, and place it in the body:
var button = new Button({ label:"click" }).placeAt(document.body);
// 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 = document.getElementById("myTabs");
new ContentPane({ href:"foo.html", title:"Wow!" }).placeAt(tc)

<protected> postRender()

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.

This method is automatically chained, so subclasses generally do not need to use dcl.superCall(), dcl.advise(), etc.

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<protected> preRender()

Processing before render().

This method is automatically chained, so subclasses generally do not need to use dcl.superCall(), dcl.advise(), etc.

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<protected> processConstructorParameters()

Called after Object is created to process parameters passed to constructor.

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refreshRendering(oldValues, isAfterInitialRendering)

Callback function to render UI upon property changes.

Parameters:
Name Type Description
oldValues Object

The hash table of old property values, keyed by property names.
isAfterInitialRendering boolean

True if this call is right after initializeRendering().
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<protected> render()

Construct the UI for this widget, filling in subnodes and/or text inside of this. Most widgets will leverage delite/handlebars! to set template, rather than defining this method.

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<protected> selectFromEvent(event, item, renderer, dispatch) → {boolean}

Applies selection triggered by an user interaction.

Parameters:
Name Type Description
event Event

The source event of the user interaction.
item Object

The item that has been selected/deselected.
renderer Object

The visual renderer of the selected/deselected item.
dispatch boolean

Whether an event must be dispatched or not.
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Returns:

True if the selection has changed and false otherwise.

Type
boolean

<protected> setClassComponent(component, value, node)

Helper method to set a class (or classes) on a given node, removing the class (or classes) set by the previous call to setClassComponent() for the specified component and node. Used mainly by template.js to set classes without overwriting classes set by the user or other code (ex: CssState).

Parameters:
Name Type Argument Description
component string

Specifies the category.
value string

Class (or classes) to set.
node HTMLElement <optional>

The node to set the property on; defaults to widget root node.
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<protected> setOrRemoveAttribute(node, name, value)

Helper method to set/remove an attribute based on the given value:

  • If value is undefined, the attribute is removed. Useful for attributes like aria-valuenow.
  • If value is boolean, the attribute is set to "true" or "false". Useful for attributes like aria-selected.
  • If value is a number, it's converted to a string.
Parameters:
Name Type Description
node Element

The node to set the property on.
name string

Name of the property.
value string

Value of the property.
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setSelected(item, value)

Change the selection state of an item.

Parameters:
Name Type Description
item Object

The item to change the selection state for.
value boolean

True to select the item, false to deselect it.
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shouldInitializeRendering(oldValues, isAfterCreation) → {boolean}

Function to return if rendering should be initialized. (Instead of making partial changes for post-initialization)

Parameters:
Name Type Description
oldValues Object

The hash table of old property values, keyed by property names.
isAfterCreation boolean

True if this call is right after instantiation.
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Returns:

True if rendering should be initialized.

Type
boolean

<protected> updateRenderers(items)

This function must be implemented to update the rendering of the items based on whether they are selected or not. The implementation must check for their new selection state and update accordingly.

Parameters:
Name Type Description
items Array.<Object>

The array of items changing their selection state.
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Events

customelement-attached

Dispatched after the CustomElement has been attached. This is useful to be notified when an HTMLElement has been upgraded to a CustomElement and attached to the DOM, in particular on browsers supporting native Custom Element.

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Example
element.addEventListener("customelement-attached", function (evt) {
     console.log("custom element: "+evt.target.id+" has been attached");
});

selection-change

Selection change event. Dispatched after the selection has been modified through user interaction.

Properties:
Name Type Description
oldValue number

The previously selected item.
newValue- number

The new selected item.
renderer Object

The visual renderer of the selected/deselected item.
triggerEvent Event

The event that lead to the selection of the item.
Source:
Example
widget.on("selection-change", function (evt) {
	console.log("old value: " + evt.oldValue);
	console.log("new value: " + evt.newValue);
}