angular2
Version:
Angular 2 - a web framework for modern web apps
62 lines • 6.2 kB
JavaScript
;"use strict";
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
return c > 3 && r && Object.defineProperty(target, key, r), r;
};
var __metadata = (this && this.__metadata) || function (k, v) {
if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};
var core_1 = require('angular2/core');
var lang_1 = require('angular2/src/facade/lang');
/**
* Removes or recreates a portion of the DOM tree based on an {expression}.
*
* If the expression assigned to `ngIf` evaluates to a false value then the element
* is removed from the DOM, otherwise a clone of the element is reinserted into the DOM.
*
* ### Example ([live demo](http://plnkr.co/edit/fe0kgemFBtmQOY31b4tw?p=preview)):
*
* ```
* <div *ngIf="errorCount > 0" class="error">
* <!-- Error message displayed when the errorCount property on the current context is greater
* than 0. -->
* {{errorCount}} errors detected
* </div>
* ```
*
* ### Syntax
*
* - `<div *ngIf="condition">...</div>`
* - `<div template="ngIf condition">...</div>`
* - `<template [ngIf]="condition"><div>...</div></template>`
*/
var NgIf = (function () {
function NgIf(_viewContainer, _templateRef) {
this._viewContainer = _viewContainer;
this._templateRef = _templateRef;
this._prevCondition = null;
}
Object.defineProperty(NgIf.prototype, "ngIf", {
set: function (newCondition /* boolean */) {
if (newCondition && (lang_1.isBlank(this._prevCondition) || !this._prevCondition)) {
this._prevCondition = true;
this._viewContainer.createEmbeddedView(this._templateRef);
}
else if (!newCondition && (lang_1.isBlank(this._prevCondition) || this._prevCondition)) {
this._prevCondition = false;
this._viewContainer.clear();
}
},
enumerable: true,
configurable: true
});
NgIf = __decorate([
core_1.Directive({ selector: '[ngIf]', inputs: ['ngIf'] }),
__metadata('design:paramtypes', [core_1.ViewContainerRef, core_1.TemplateRef])
], NgIf);
return NgIf;
}());
exports.NgIf = NgIf;
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