angular2
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Angular 2 - a web framework for modern web apps
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JavaScript
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
if (typeof Reflect === "object" && typeof Reflect.decorate === "function") return Reflect.decorate(decorators, target, key, desc);
switch (arguments.length) {
case 2: return decorators.reduceRight(function(o, d) { return (d && d(o)) || o; }, target);
case 3: return decorators.reduceRight(function(o, d) { return (d && d(target, key)), void 0; }, void 0);
case 4: return decorators.reduceRight(function(o, d) { return (d && d(target, key, o)) || o; }, desc);
}
};
var __metadata = (this && this.__metadata) || function (k, v) {
if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};
import { Directive, ChangeDetectorRef, IterableDiffers, ViewContainerRef, TemplateRef } from 'angular2/core';
import { isPresent, isBlank } from 'angular2/src/facade/lang';
/**
* The `NgFor` directive instantiates a template once per item from an iterable. The context for
* each instantiated template inherits from the outer context with the given loop variable set
* to the current item from the iterable.
*
* # Local Variables
*
* `NgFor` provides several exported values that can be aliased to local variables:
*
* * `index` will be set to the current loop iteration for each template context.
* * `last` will be set to a boolean value indicating whether the item is the last one in the
* iteration.
* * `even` will be set to a boolean value indicating whether this item has an even index.
* * `odd` will be set to a boolean value indicating whether this item has an odd index.
*
* # Change Propagation
*
* When the contents of the iterator changes, `NgFor` makes the corresponding changes to the DOM:
*
* * When an item is added, a new instance of the template is added to the DOM.
* * When an item is removed, its template instance is removed from the DOM.
* * When items are reordered, their respective templates are reordered in the DOM.
* * Otherwise, the DOM element for that item will remain the same.
*
* Angular uses object identity to track insertions and deletions within the iterator and reproduce
* those changes in the DOM. This has important implications for animations and any stateful
* controls
* (such as `<input>` elements which accept user input) that are present. Inserted rows can be
* animated in, deleted rows can be animated out, and unchanged rows retain any unsaved state such
* as user input.
*
* It is possible for the identities of elements in the iterator to change while the data does not.
* This can happen, for example, if the iterator produced from an RPC to the server, and that
* RPC is re-run. Even if the data hasn't changed, the second response will produce objects with
* different identities, and Angular will tear down the entire DOM and rebuild it (as if all old
* elements were deleted and all new elements inserted). This is an expensive operation and should
* be avoided if possible.
*
* # Syntax
*
* - `<li *ng-for="#item of items; #i = index">...</li>`
* - `<li template="ng-for #item of items; #i = index">...</li>`
* - `<template ng-for #item [ng-for-of]="items" #i="index"><li>...</li></template>`
*
* ### Example
*
* See a [live demo](http://plnkr.co/edit/KVuXxDp0qinGDyo307QW?p=preview) for a more detailed
* example.
*/
export let NgFor = class {
constructor(_viewContainer, _templateRef, _iterableDiffers, _cdr) {
this._viewContainer = _viewContainer;
this._templateRef = _templateRef;
this._iterableDiffers = _iterableDiffers;
this._cdr = _cdr;
}
set ngForOf(value) {
this._ngForOf = value;
if (isBlank(this._differ) && isPresent(value)) {
this._differ = this._iterableDiffers.find(value).create(this._cdr);
}
}
set ngForTemplate(value) {
if (isPresent(value)) {
this._templateRef = value;
}
}
ngDoCheck() {
if (isPresent(this._differ)) {
var changes = this._differ.diff(this._ngForOf);
if (isPresent(changes))
this._applyChanges(changes);
}
}
_applyChanges(changes) {
// TODO(rado): check if change detection can produce a change record that is
// easier to consume than current.
var recordViewTuples = [];
changes.forEachRemovedItem((removedRecord) => recordViewTuples.push(new RecordViewTuple(removedRecord, null)));
changes.forEachMovedItem((movedRecord) => recordViewTuples.push(new RecordViewTuple(movedRecord, null)));
var insertTuples = this._bulkRemove(recordViewTuples);
changes.forEachAddedItem((addedRecord) => insertTuples.push(new RecordViewTuple(addedRecord, null)));
this._bulkInsert(insertTuples);
for (var i = 0; i < insertTuples.length; i++) {
this._perViewChange(insertTuples[i].view, insertTuples[i].record);
}
for (var i = 0, ilen = this._viewContainer.length; i < ilen; i++) {
this._viewContainer.get(i).setLocal('last', i === ilen - 1);
}
}
_perViewChange(view, record) {
view.setLocal('\$implicit', record.item);
view.setLocal('index', record.currentIndex);
view.setLocal('even', (record.currentIndex % 2 == 0));
view.setLocal('odd', (record.currentIndex % 2 == 1));
}
_bulkRemove(tuples) {
tuples.sort((a, b) => a.record.previousIndex - b.record.previousIndex);
var movedTuples = [];
for (var i = tuples.length - 1; i >= 0; i--) {
var tuple = tuples[i];
// separate moved views from removed views.
if (isPresent(tuple.record.currentIndex)) {
tuple.view = this._viewContainer.detach(tuple.record.previousIndex);
movedTuples.push(tuple);
}
else {
this._viewContainer.remove(tuple.record.previousIndex);
}
}
return movedTuples;
}
_bulkInsert(tuples) {
tuples.sort((a, b) => a.record.currentIndex - b.record.currentIndex);
for (var i = 0; i < tuples.length; i++) {
var tuple = tuples[i];
if (isPresent(tuple.view)) {
this._viewContainer.insert(tuple.view, tuple.record.currentIndex);
}
else {
tuple.view =
this._viewContainer.createEmbeddedView(this._templateRef, tuple.record.currentIndex);
}
}
return tuples;
}
};
NgFor = __decorate([
Directive({ selector: '[ng-for][ng-for-of]', inputs: ['ngForOf', 'ngForTemplate'] }),
__metadata('design:paramtypes', [ViewContainerRef, TemplateRef, IterableDiffers, ChangeDetectorRef])
], NgFor);
class RecordViewTuple {
constructor(record, view) {
this.record = record;
this.view = view;
}
}
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{\n  DoCheck,\n  Directive,\n  ChangeDetectorRef,\n  IterableDiffer,\n  IterableDiffers,\n  ViewContainerRef,\n  TemplateRef,\n  ViewRef\n} from 'angular2/core';\nimport {isPresent, isBlank} from 'angular2/src/facade/lang';\n\n/**\n * The `NgFor` directive instantiates a template once per item from an iterable. The context for\n * each instantiated template inherits from the outer context with the given loop variable set\n * to the current item from the iterable.\n *\n * # Local Variables\n *\n * `NgFor` provides several exported values that can be aliased to local variables:\n *\n * * `index` will be set to the current loop iteration for each template context.\n * * `last` will be set to a boolean value indicating whether the item is the last one in the\n *   iteration.\n * * `even` will be set to a boolean value indicating whether this item has an even index.\n * * `odd` will be set to a boolean value indicating whether this item has an odd index.\n *\n * # Change Propagation\n *\n * When the contents of the iterator changes, `NgFor` makes the corresponding changes to the DOM:\n *\n * * When an item is added, a new instance of the template is added to the DOM.\n * * When an item is removed, its template instance is removed from the DOM.\n * * When items are reordered, their respective templates are reordered in the DOM.\n * * Otherwise, the DOM element for that item will remain the same.\n *\n * Angular uses object identity to track insertions and deletions within the iterator and reproduce\n * those changes in the DOM. This has important implications for animations and any stateful\n * controls\n * (such as `<input>` elements which accept user input) that are present. Inserted rows can be\n * animated in, deleted rows can be animated out, and unchanged rows retain any unsaved state such\n * as user input.\n *\n * It is possible for the identities of elements in the iterator to change while the data does not.\n * This can happen, for example, if the iterator produced from an RPC to the server, and that\n * RPC is re-run. Even if the data hasn't changed, the second response will produce objects with\n * different identities, and Angular will tear down the entire DOM and rebuild it (as if all old\n * elements were deleted and all new elements inserted). This is an expensive operation and should\n * be avoided if possible.\n *\n * # Syntax\n *\n * - `<li *ng-for=\"#item of items; #i = index\">...</li>`\n * - `<li template=\"ng-for #item of items; #i = index\">...</li>`\n * - `<template ng-for #item [ng-for-of]=\"items\" #i=\"index\"><li>...</li></template>`\n *\n * ### Example\n *\n * See a [live demo](http://plnkr.co/edit/KVuXxDp0qinGDyo307QW?p=preview) for a more detailed\n * example.\n */\n@Directive({selector: '[ng-for][ng-for-of]', inputs: ['ngForOf', 'ngForTemplate']})\nexport class NgFor implements DoCheck {\n  /** @internal */\n  _ngForOf: any;\n  private _differ: IterableDiffer;\n\n  constructor(private _viewContainer: ViewContainerRef, private _templateRef: TemplateRef,\n              private _iterableDiffers: IterableDiffers, private _cdr: ChangeDetectorRef) {}\n\n  set ngForOf(value: any) {\n    this._ngForOf = value;\n    if (isBlank(this._differ) && isPresent(value)) {\n      this._differ = this._iterableDiffers.find(value).create(this._cdr);\n    }\n  }\n\n  set ngForTemplate(value: TemplateRef) {\n    if (isPresent(value)) {\n      this._templateRef = value;\n    }\n  }\n\n  ngDoCheck() {\n    if (isPresent(this._differ)) {\n      var changes = this._differ.diff(this._ngForOf);\n      if (isPresent(changes)) this._applyChanges(changes);\n    }\n  }\n\n  private _applyChanges(changes) {\n    // TODO(rado): check if change detection can produce a change record that is\n    // easier to consume than current.\n    var recordViewTuples = [];\n    changes.forEachRemovedItem((removedRecord) =>\n                                   recordViewTuples.push(new RecordViewTuple(removedRecord, null)));\n\n    changes.forEachMovedItem((movedRecord) =>\n                                 recordViewTuples.push(new RecordViewTuple(movedRecord, null)));\n\n    var insertTuples = this._bulkRemove(recordViewTuples);\n\n    changes.forEachAddedItem((addedRecord) =>\n                                 insertTuples.push(new RecordViewTuple(addedRecord, null)));\n\n    this._bulkInsert(insertTuples);\n\n    for (var i = 0; i < insertTuples.length; i++) {\n      this._perViewChange(insertTuples[i].view, insertTuples[i].record);\n    }\n\n    for (var i = 0, ilen = this._viewContainer.length; i < ilen; i++) {\n      this._viewContainer.get(i).setLocal('last', i === ilen - 1);\n    }\n  }\n\n  private _perViewChange(view, record) {\n    view.setLocal('\\$implicit', record.item);\n    view.setLocal('index', record.currentIndex);\n    view.setLocal('even', (record.currentIndex % 2 == 0));\n    view.setLocal('odd', (record.currentIndex % 2 == 1));\n  }\n\n  private _bulkRemove(tuples: RecordViewTuple[]): RecordViewTuple[] {\n    tuples.sort((a, b) => a.record.previousIndex - b.record.previousIndex);\n    var movedTuples = [];\n    for (var i = tuples.length - 1; i >= 0; i--) {\n      var tuple = tuples[i];\n      // separate moved views from removed views.\n      if (isPresent(tuple.record.currentIndex)) {\n        tuple.view = this._viewContainer.detach(tuple.record.previousIndex);\n        movedTuples.push(tuple);\n      } else {\n        this._viewContainer.remove(tuple.record.previousIndex);\n      }\n    }\n    return movedTuples;\n  }\n\n  private _bulkInsert(tuples: RecordViewTuple[]): RecordViewTuple[] {\n    tuples.sort((a, b) => a.record.currentIndex - b.record.currentIndex);\n    for (var i = 0; i < tuples.length; i++) {\n      var tuple = tuples[i];\n      if (isPresent(tuple.view)) {\n        this._viewContainer.insert(tuple.view, tuple.record.currentIndex);\n      } else {\n        tuple.view =\n            this._viewContainer.createEmbeddedView(this._templateRef, tuple.record.currentIndex);\n      }\n    }\n    return tuples;\n  }\n}\n\nclass RecordViewTuple {\n  view: ViewRef;\n  record: any;\n  constructor(record, view) {\n    this.record = record;\n    this.view = view;\n  }\n}\n"]}