angular2
Version:
Angular 2 - a web framework for modern web apps
97 lines • 9.85 kB
JavaScript
;"use strict";
var collection_1 = require('angular2/src/facade/collection');
var lang_1 = require('angular2/src/facade/lang');
var async_1 = require('angular2/src/facade/async');
/**
* An unmodifiable list of items that Angular keeps up to date when the state
* of the application changes.
*
* The type of object that {@link QueryMetadata} and {@link ViewQueryMetadata} provide.
*
* Implements an iterable interface, therefore it can be used in both ES6
* javascript `for (var i of items)` loops as well as in Angular templates with
* `*ngFor="let i of myList"`.
*
* Changes can be observed by subscribing to the changes `Observable`.
*
* NOTE: In the future this class will implement an `Observable` interface.
*
* ### Example ([live demo](http://plnkr.co/edit/RX8sJnQYl9FWuSCWme5z?p=preview))
* ```typescript
* @Component({...})
* class Container {
* constructor(@Query(Item) items: QueryList<Item>) {
* items.changes.subscribe(_ => console.log(items.length));
* }
* }
* ```
*/
var QueryList = (function () {
function QueryList() {
this._dirty = true;
this._results = [];
this._emitter = new async_1.EventEmitter();
}
Object.defineProperty(QueryList.prototype, "changes", {
get: function () { return this._emitter; },
enumerable: true,
configurable: true
});
Object.defineProperty(QueryList.prototype, "length", {
get: function () { return this._results.length; },
enumerable: true,
configurable: true
});
Object.defineProperty(QueryList.prototype, "first", {
get: function () { return collection_1.ListWrapper.first(this._results); },
enumerable: true,
configurable: true
});
Object.defineProperty(QueryList.prototype, "last", {
get: function () { return collection_1.ListWrapper.last(this._results); },
enumerable: true,
configurable: true
});
/**
* returns a new array with the passed in function applied to each element.
*/
QueryList.prototype.map = function (fn) { return this._results.map(fn); };
/**
* returns a filtered array.
*/
QueryList.prototype.filter = function (fn) { return this._results.filter(fn); };
/**
* returns a reduced value.
*/
QueryList.prototype.reduce = function (fn, init) { return this._results.reduce(fn, init); };
/**
* executes function for each element in a query.
*/
QueryList.prototype.forEach = function (fn) { this._results.forEach(fn); };
/**
* converts QueryList into an array
*/
QueryList.prototype.toArray = function () { return collection_1.ListWrapper.clone(this._results); };
QueryList.prototype[lang_1.getSymbolIterator()] = function () { return this._results[lang_1.getSymbolIterator()](); };
QueryList.prototype.toString = function () { return this._results.toString(); };
/**
* @internal
*/
QueryList.prototype.reset = function (res) {
this._results = collection_1.ListWrapper.flatten(res);
this._dirty = false;
};
/** @internal */
QueryList.prototype.notifyOnChanges = function () { this._emitter.emit(this); };
/** internal */
QueryList.prototype.setDirty = function () { this._dirty = true; };
Object.defineProperty(QueryList.prototype, "dirty", {
/** internal */
get: function () { return this._dirty; },
enumerable: true,
configurable: true
});
return QueryList;
}());
exports.QueryList = QueryList;
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