import { Component } from '@angular/core';
import { HomePage } from './home.page';
@Component({
template: `<ion-nav [root]="rootPage"></ion-nav>`
})
export class AppComponent {
rootPage = HomePage;
}
/*
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
*/
import { NgModule } from '@angular/core';
import { IonicApp, IonicModule } from 'ionic-angular';
import { AppComponent } from './app.component';
import { HomePage } from './home.page';
import { NextPage } from './next.page';
@NgModule({
imports: [ IonicModule.forRoot(AppComponent) ],
declarations: [ AppComponent, HomePage, NextPage ],
entryComponents: [ HomePage,NextPage ],
bootstrap: [ IonicApp ]
})
export class AppModule { }
/*
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
*/
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app.module';
const platform = platformBrowserDynamic();
platform.bootstrapModule(AppModule);
/*
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
*/
<!DOCTYPE html>
<html>
<head>
<title>Ionic 2 QuickStart</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- 1. Load libraries -->
<!-- Polyfill(s) for older browsers -->
<script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script>
<script src="https://unpkg.com/zone.js@0.6.21?main=browser"></script>
<script src="https://unpkg.com/systemjs@0.19.40/dist/system.src.js"></script>
<!-- 2. Configure SystemJS -->
<script src="systemjs.config.js"></script>
<link href="https://unpkg.com/ionic-angular@2.0.0-rc.6/css/ionic.css" rel="stylesheet">
</head>
<!-- 3. Display the application -->
<body>
<ion-app></ion-app>
<script>
System.import('app').catch(function(err){ console.error(err); });
</script>
</body>
</html>
<!--
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
-->
### Ionic 2 - Make API Call Before Loading Page
Basic Ionic 2 plunk based on the Angular QuickStart plunk.
trying to answer this question from the Ionic Forum
We use `ionViewCanEnter` as a guard to load data and only if it resolves do we go forward
[Make API Call Before Loading Page](https://forum.ionicframework.com/t/make-api-call-before-page-load/55877/7)
###CheckOut Video on YouTube
https://youtu.be/ZWYhR4Qo0PE
/**
* PLUNKER VERSION
* (based on systemjs.config.js in angular.io)
* System configuration for Angular samples
* Adjust as necessary for your application needs.
*/
(function (global) {
System.config({
// DEMO ONLY! REAL CODE SHOULD NOT TRANSPILE IN THE BROWSER
transpiler: 'ts',
typescriptOptions: {
tsconfig: true
},
meta: {
'typescript': {
"exports": "ts"
}
},
paths: {
// paths serve as alias
'npm:': 'https://unpkg.com/'
},
// map tells the System loader where to look for things
map: {
// our app is within the app folder
app: 'app',
// angular bundles
'@angular/core': 'npm:@angular/core@2.2.1/bundles/core.umd.js',
'@angular/common': 'npm:@angular/common@2.2.1/bundles/common.umd.js',
'@angular/compiler': 'npm:@angular/compiler@2.2.1/bundles/compiler.umd.js',
'@angular/platform-browser': 'npm:@angular/platform-browser@2.2.1/bundles/platform-browser.umd.js',
'@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic@2.2.1/bundles/platform-browser-dynamic.umd.js',
'@angular/http': 'npm:@angular/http@2.2.1/bundles/http.umd.js',
'@angular/forms': 'npm:@angular/forms@2.2.1/bundles/forms.umd.js',
'ionic-angular': 'npm:ionic-angular@2.0.0-rc.6',
'rxjs': 'npm:rxjs@5.0.0-beta.12',
'ts': 'npm:plugin-typescript@5.2.7/lib/plugin.js',
'typescript': 'npm:typescript@2.0.7/lib/typescript.js',
},
// packages tells the System loader how to load when no filename and/or no extension
packages: {
app: {
main: './main.ts',
defaultExtension: 'ts'
},
rxjs: {
defaultExtension: 'js'
},
'ionic-angular': {
main: './umd/index.js',
defaultExtension: 'js'
}
}
});
})(this);
/*
Copyright 2016 Google Inc. All Rights Reserved.
Use of this source code is governed by an MIT-style license that
can be found in the LICENSE file at http://angular.io/license
*/
{
"compilerOptions": {
"target": "es5",
"module": "commonjs",
"moduleResolution": "node",
"sourceMap": true,
"emitDecoratorMetadata": true,
"experimentalDecorators": true,
"removeComments": false,
"noImplicitAny": true,
"suppressImplicitAnyIndexErrors": true
}
}
import { Component } from '@angular/core';
import { NavController } from 'ionic-angular';
import { NextPage } from './next.page'
@Component({
selector: 'page-home',
templateUrl: 'app/home.page.html'
})
export class HomePage {
appName = 'Ionic App';
constructor(public navController: NavController ) {
}
nextPageWithError() {
this.navController.push(NextPage, {fail:true}).catch(()=>{
console.log("Page didnt load")
})
}
nextPage() {
this.navController.push(NextPage).catch(()=>{
console.log("Page didnt load")
})
}
}
<ion-header>
<ion-navbar>
<ion-title>{{ appName }}</ion-title>
</ion-navbar>
</ion-header>
<ion-content padding>
Welcome to this <ion-icon name="ionic"></ion-icon> <b>Ionic 2 app</b>
<div>
<button ion-button (click)="nextPage()" >Next Page</button>
<button ion-button (click)="nextPageWithError()" >Should Not Load Next Page</button>
</div>
</ion-content>
import { Component } from '@angular/core';
import { Http } from '@angular/http';
import { NavController, NavParams } from 'ionic-angular';
import { Observable } from 'rxjs';
import 'rxjs/add/operator/catch';
import 'rxjs/add/operator/map';
@Component({
selector: 'page-next',
templateUrl: 'app/next.page.html'
})
export class NextPage {
http
userList
constructor (private http: Http, private params: NavParams) {
console.log("in constructor")
this.http = http
}
ionViewCanEnter() {
console.log("in ionViewCanEnter")
return new Promise((resolve, reject) => {
if (this.params.get('fail')) {
reject(true)
} else {
this.http.get('https://randomuser.me/api/?results=5')
.map(res => res.json().results)
.subscribe(
(res)=> {
console.log(res)
this.userList = res
resolve(res)
},
(err)=>{
reject(err)
}
);
}
});
}
ionViewDidEnter() {
console.log("in ionViewDidEnter")
}
}
<ion-header>
<ion-navbar>
<ion-title>Next Page</ion-title>
</ion-navbar>
</ion-header>
<ion-content padding>
IN THE NEXT PAGE
<!-- lets show the data -->
<ion-list>
<ion-item *ngFor="let user of userList">
<div>{{user.name.first}} {{user.name.last}}</div>
<p>{{user.email}}</p>
</ion-item>
</ion-list>
</ion-content>