Module: deliteful/Select

deliteful/Select

require(["deliteful/Select"], function (Select) {
  new Select();
});

A form-aware and store-aware widget leveraging the native HTML5 <select> element. It has the following characteristics:

  • The corresponding custom tag is <d-select>.
  • Store support (limitation: to avoid graphic glitches, the updates to the store should not be done while the native dropdown of the select is open).
  • The item rendering has the limitations of the <option> elements of the native <select>, in particular it is text-only.

TODO: improve doc.

Remarks:

  • The option items must be added, removed or updated exclusively using the store API. Direct operations using the DOM API are not supported.
  • The handling of the selected options of the underlying native <select> must be done using the API inherited by deliteful/Select from delite/Selection.
Source:
Examples

Using the default store

JS:
require(["delite/register", "deliteful/Select", "requirejs-domready/domReady!"],
 function (register) {
   register.parse();
   select1.store.add({text: "Option 1", value: "1"});
   ...
 });
HTML:
<d-select id="select1"></d-select>

Using user's store

JS:
require(["delite/register", "dstore/Memory", "dstore/Trackable",
       "deliteful/Select", "requirejs-domready/domReady!"],
 function (register, Memory, Trackable) {
   register.parse();
   var store = new (Memory.createSubclass(Trackable))({});
   select1.store = store;
   store.add({text: "Option 1", value: "1"});
   ...
 });
HTML:
<d-select selectionMode="multiple" id="select1"></d-select>

Extends

Show inherited

Members

<protected> _started :boolean

Set to true when startup() has completed.

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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disabledAttr :string

The name of the property of store items which contains the disabled value of Select's options. To disable a given option, the disabled property of the corresponding data item must be set to a truthy value. Otherwise, the option is enabled if data item property is absent, or its value is falsy or the string "false".

Type:
  • string
Default Value:
  • "disabled"
Source:

<protected> focused :boolean

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

Type:
  • boolean
Inherited From:
Default Value:
  • false
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query :Object

A query filter to apply to the store.

Type:
  • Object
Inherited From:
Default Value:
  • {}
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renderItems :Array.<Object>

The render items corresponding to the store items for this widget. This is filled from the store and is not supposed to be modified directly. Initially null.

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

The chosen selection mode.

Valid values are:

  1. "single": Only one option can be selected at a time.
  2. "multiple": Several options can be selected (by taping or using the control key modifier).

Changing this value impacts the currently selected items to adapt the selection to the new mode. However, regardless of the selection mode, it is always possible to set several selected items using the selectedItem or selectedItems properties. The mode will be enforced only when using setSelected and/or selectFromEvent APIs.

Type:
  • string
Default Value:
  • "single"
Source:

size :number

The number of rows that should be visible at one time when the widget is presented as a scrollable list box. Corresponds to the size attribute of the underlying native HTML <select>.

Type:
  • number
Default Value:
  • 0
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store :dstore/Store

The store that contains the items to display.

Type:
  • dstore/Store
Inherited From:
Default Value:
  • null
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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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textAttr :string

The name of the property of store items which contains the text of Select's options.

Type:
  • string
Default Value:
  • "text"
Source:

valueAttr :string

The name of the property of store items which contains the value of Select's options.

Type:
  • string
Default Value:
  • "value"
Source:

<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 get 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> _itemRemoved(event)

When the store is observed and an item is removed in the store this method is called to remove the corresponding render item. This can be redefined but must not be called directly.

Parameters:
Name Type Description
event Event

The "remove" dstore/Trackable event.
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<protected> _onBlur()

This is where widgets do processing for when they stop being active, such as changing CSS classes. See onBlur() for more details.

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<protected> _onFocus()

This is where widgets do processing for when they are active, such as changing CSS classes. See onFocus() for more details.

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<protected> _parseAttr(name, value)

Helper for _mapAttributes(). 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> _parseFunctionAttr(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> _set(name, value)

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

Directly change 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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<protected> attachedCallback()

Called when the widget is first inserted into the document. If widget is created programatically then app must call startup() to trigger this method.

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<protected> buildRendering()

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> computeProperties(props)

If the store parameters are invalidated, queries the store, creates the render items and calls initItems() when ready. If an error occurs a 'query-error' event will be fired.

Parameters:
Name Type Description
props
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<protected> createdCallback()

Kick off the life-cycle of a widget.

Calls a number of widget methods (preCreate(), buildRendering(), and postCreate()), some of which of you'll want to override.

Of course, adventurous developers could override createdCallback entirely, but this should only be done as a last resort.

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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 for computed properties and then UI rendering so that refreshingRendering() is called if there are pending change records.

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deliverComputing()

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

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destroy()

Destroy this widget and its descendants.

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discardChanges()

Discard change records.

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discardComputing()

Discard change records for computed properties.

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

Signal that a synthetic event occurred.

Emits an event of specified type, based on eventObj. Also calls onType() method, if present, and returns value from that method. Modifies eventObj by adding missing parameters (bubbles, cancelable, widget).

Parameters:
Name Type Argument Description
type string

Name of event.
eventObj Object <optional>

Properties to mix in to emitted event.
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Returns:

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

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

<protected> fetch(collection)

Called to perform the fetch operation on the collection.

Parameters:
Name Type Description
collection dstore/Collection

Items to be displayed.
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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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focus()

Put focus on this widget.

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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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getParent()

Returns the parent widget of this widget.

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<protected> initItems(renderItems) → {Array.<Object>}

This method is called once the query has been executed to initialize the renderItems array with the list of initial render items.

This method sets the renderItems property to the render items array passed as parameter. Once done, it fires a 'query-success' event.

Parameters:
Name Type Description
renderItems Array.<Object>

The array of initial render items to be set in the renderItems property.
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Returns:

the renderItems array.

Type
Array.<Object>

<protected> isLeftToRight() → {boolean}

Return this widget's explicit or implicit orientation (true for LTR, false for RTL).

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Returns:
Type
boolean

<protected> itemAdded(index, renderItem, renderItems)

This method is called when an item is added in an observable store. The default implementation actually adds the renderItem to the renderItems array. This can be redefined but must not be called directly.

Parameters:
Name Type Description
index number

The index where to add the render item.
renderItem Object

The render item to be added.
renderItems Array.<Object>

The array of render items to add the render item to.
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<protected> itemMoved(previousIndex, newIndex, renderItem, renderItems)

This method is called when an item is moved in an observable store. The default implementation actually moves the renderItem in the renderItems array. This can be redefined but must not be called directly.

Parameters:
Name Type Description
previousIndex number

The previous index of the render item.
newIndex number

The new index of the render item.
renderItem Object

The render item to be moved.
renderItems Array.<Object>

The array of render items to render item to be moved is part of.
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<protected> itemRemoved(index, renderItems)

This method is called when an item is removed from an observable store. The default implementation actually removes a renderItem from the renderItems array. This can be redefined but must not be called directly.

Parameters:
Name Type Description
index number

The index of the render item to remove.
renderItems Array.<Object>

The array of render items to remove the render item from.
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<protected> itemToRenderItem(item) → {Object}

Returns the widget internal item for a given store item. By default it returns the store item itself.

Parameters:
Name Type Description
item Object

The store item.
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Returns:
Type
Object

<protected> itemUpdated(index, renderItem, renderItems)

This method is called when an item is updated in an observable store. The default implementation actually updates the renderItem in the renderItems array. This can be redefined but must not be called directly.

Parameters:
Name Type Description
index number

The index of the render item to update.
renderItem Object

The render item data the render item must be updated with.
renderItems Array.<Object>

The array of render items to render item to be updated is part of.
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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)

Notify current value to observers. Handy to manually schedule invocation of observer callbacks when there is no change in value.

Parameters:
Name Type Description
name string

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

Observe 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 is 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 widget's scope you must do myWidget.on("click", myWidget.func.bind(myWidget)).

Parameters:
Name Type Argument Description
type string | function

Name of event (ex: "click") or extension event like touch.press.
func function

Callback function.
node Element <optional>

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

Handle with remove() method to cancel the event.

Type
Object

onBlur()

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.

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onFocus(evt)

Called when the widget becomes "active" because it or a widget inside of it either has focus, or has recently been clicked.

Parameters:
Name Type Description
evt Event

A focus event.
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<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> 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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Source:
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> postCreate()

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.

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<protected> preCreate()

Processing before buildRendering().

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<protected> processCollection(collection)

Called to process the items returned after querying the store.

Parameters:
Name Type Description
collection dstore/Collection

Items to be displayed.
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<protected> processConstructorParameters()

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

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processQueryResult()

A function that processes the collection returned by the store query and returns a new collection (to sort it, etc...). This processing is applied before potentially tracking the store for modifications (if Trackable). Changing this function on the instance will not automatically refresh the class.

Inherited From:
Default Value:
  • identity function
Source:

<protected> queryStoreAndInitItems(processQueryResult) → {Promise}

Queries the store, creates the render items and calls initItems() when ready. If an error occurs a 'query-error' event will be fired.

This method is not supposed to be called by application developer. It will be called automatically when modifying the store related properties or by the subclass if needed.

Parameters:
Name Type Description
processQueryResult

A function that processes the collection returned by the store query and returns a new collection (to sort it, etc...)., applied before tracking.
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Returns:

If store to be processed is not null a promise that will be resolved when the loading process will be finished.

Type
Promise

refreshRendering(newValues, oldValues)

Callback function to render UI upon property changes.

Parameters:
Name Type Description
newValues Object

The hash table of new property values, keyed by property names.
oldValues Object

The hash table of old property values, keyed by property names.
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renderItemToItem(renderItem) → {Object}

Creates a store item based from the widget internal item.

Parameters:
Name Type Description
renderItem Object

The render item.
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Returns:
Type
Object

<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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startup()

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 deliteful/Dialog or an unselected tab of a deliteful/TabContainer. For widgets that need to do layout, it's best to put that layout code inside resize(), and then extend delite/LayoutWidget so that resize() is called when the widget is visible.

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