{"id":4715,"date":"2017-01-29T22:52:35","date_gmt":"2017-01-29T20:52:35","guid":{"rendered":"https:\/\/www.tomislavstankovic.com\/blog\/?p=4715"},"modified":"2019-01-05T19:58:08","modified_gmt":"2019-01-05T17:58:08","slug":"ionic2-prikaz-json-podatak-api","status":"publish","type":"post","link":"https:\/\/www.tomislavstankovic.com\/blog\/ionic2-prikaz-json-podatak-api\/","title":{"rendered":"Ionic 2 – prikaz JSON-a sa API-ja"},"content":{"rendered":"

Iako su neke aplikacije same sebi dostatne ipak je vi\u0161e onih koje ovise o podacima s vanjskih izvora, a to su javni ili privatni API-ji. U ovom blog postu prikazat \u0107emo primjer dohva\u0107anja JSON (JavaScript Object Notation)<\/a><\/em> podataka s javnog API-ja RandomUser.Me<\/a><\/em>.<\/p>\n

Za\u0161to ba\u0161 RandomUser<\/em><\/a>? Zato \u0161to na jednostavniji na\u010din, bez da kreirate i pokre\u0107ete svoj API <\/em>mo\u017eete napraviti i testirati svoju Ionic 2<\/em> aplikaciju \u0161to je posebno korisno u procesu u\u010denja.<\/p>\n

Kreiranje Ionic 2 projekta<\/h2>\n

Za po\u010detak \u0107emo kreirati novi Ionic 2<\/em> projekt<\/a> koriste\u0107i blank<\/span> predlo\u017eak.<\/p>\n

$ ionic start Ionic2RandomUser blank \u2013-v2\r\n$ cd Ionic2RandomUser\r\n$ ionic serve<\/pre>\n
Aplikacija u web pregledniku sada izgleda ovako. Zna\u010di, ni\u0161ta posebno.<\/p>\n
\"Ionic2<\/a><\/p>\n
Ako \u017eelite saznati ne\u0161to vi\u0161e o strukturi Ionic 2<\/em> aplikacije prou\u010dite moj prethodni blog post<\/a>.<\/p>\n
Ionic 2 provides (servisi)<\/h2>\n
Prije nego krenemo s izradom su\u010delja aplikacije i logike za prikaz podataka idemo napraviti servis koji \u0107e nam dohva\u0107ati potrebne podatke. Koristiti \u0107emo sljede\u0107i URL https:\/\/randomuser.me\/api\/?results=10<\/a>. Ako kliknete na link vidjet \u0107ete JSON <\/em>sa 10 korisnika.<\/p>\n
Servis nam slu\u017ei za dohva\u0107anje podataka s JSON API<\/em>-ja koriste\u0107i HTTP <\/em>protokol. I ovdje \u0107emo koristiti Ionic 2 CLI<\/a><\/em> pa \u0107emo servis kreirati pomo\u0107u naredbe  $ ionic g provider RandomUserProvider<\/span>.<\/p>\n
Servisi se automatski kreiraju u mapi  providers<\/span>.<\/p>\n
\"Ionic2Provider\"<\/a><\/p>\n
U  random-user-provider.ts<\/span> dodat \u0107emo sljede\u0107e:<\/p>\n
import { Injectable } from '@angular\/core';\r\nimport { Http } from '@angular\/http';\r\nimport 'rxjs\/add\/operator\/map';\r\n\r\n@Injectable()\r\nexport class RandomUserProvider {\r\n\r\n  constructor(public _http: Http) {\r\n    console.log('Hello RandomUserProvider Provider');\r\n  }\r\n\r\n  loadRandomUsers(){\r\n    return this._http.get('https:\/\/randomuser.me\/api\/?results=10')\r\n      .map(res => res.json());\r\n  }\r\n\r\n}<\/pre>\n
Pozivanje servisa<\/h2>\n
Servis sada moramo pozvati u komponentu koja \u0107e \u010diniti logiku na\u0161e aplikacije. Prvo je potrebno pozvati servis  import { RandomUserProvider } from ‘..\/..\/providers\/random-user-provider’;<\/span> kako bi ga mogli koristiti. <\/p>\n
Iako smo sada pozvali servis to i dalje ne zna\u010di da ga mo\u017eemo koristiti. Kako bi to omogu\u0107ili moramo ga navesti kao dio na\u0161e komponente  @Component<\/span>, a to \u010dinimo sa  providers: [RandomUserProvider]<\/span> .<\/p>\n
Sljede\u0107i korak je kreirati konstruktor  _randomUser<\/span> za  RandomUserProvider<\/span>.<\/p>\n
Sada mo\u017eemo kreirati funkciju  getUsers()<\/span>  koja \u0107e nam prikazati korisnike.<\/p>\n
U kona\u010dnici to izgleda ovako:<\/p>\n
import { Component } from '@angular\/core';\r\nimport { NavController } from 'ionic-angular';\r\nimport { RandomUserProvider } from '..\/..\/providers\/random-user-provider';\r\n\r\n@Component({\r\n  selector: 'page-home',\r\n  templateUrl: 'home.html',\r\n  providers: [RandomUserProvider]\r\n})\r\nexport class HomePage {\r\n\r\n  constructor(public _navCtrl: NavController,\r\n              public _randomUser: RandomUserProvider ) {\r\n             \/\/ this.getUsers();\r\n  }\r\n\r\n  getUsers(){\r\n     this._randomUser.loadRandomUsers().subscribe(res => {\r\n     this.user = res.results;\r\n     console.log(this.user);\r\n    });\r\n  }\r\n\r\n}<\/pre>\n
Ozna\u010dene linije dodali smo u na\u0161u  HomePage <\/span> komponentu.<\/p>\n
P.S. Ako se odkomentira linija 16 podaci \u0107e se automatski prikazati bez potrebe za klikom na gumb  GET Users<\/span>.<\/p>\n
Su\u010delje za prikaz<\/h2>\n
Logiku aplikacije smo napravili i sada se mo\u017eemo pozabaviti su\u010deljem za prikaz koji \u0107e biti obi\u010dan popis<\/a>.<\/p>\n
*ngFor<\/a> direktiva \u0107e pro\u0107i kroz popis korisnika i za svakog kreirati po jedan red u popisu.<\/p>\n
<ion-header>\r\n  <ion-navbar>\r\n    <ion-title>\r\n     Top 10 Random Users\r\n    <\/ion-title>\r\n  <\/ion-navbar>\r\n<\/ion-header>\r\n\r\n<ion-content padding>\r\n  <button ion-button color=\"light\" (click)=\"getUsers()\">GET Users<\/button>\r\n   <ion-list>\r\n    <ion-item *ngFor=\"let u of user\">\r\n      <ion-avatar item-left>\r\n        <img src=\"{{u.picture.thumbnail}}\">\r\n      <\/ion-avatar>\r\n      <h2>{{u.name.first}} {{u.name.last}}<\/h2>\r\n      <p>{{u.email}}<\/p>\r\n    <\/ion-item>\r\n  <\/ion-list> \r\n<\/ion-content><\/pre>\n
Kona\u010dan izgled aplikacije<\/h2>\n
 $ ionic serve<\/span>  daje nam kona\u010dan izgled na\u0161e aplikacije s uspje\u0161no dohva\u0107enim JSON<\/em>-om.<\/p>\n
\"Get<\/a><\/p>\n
Zaklju\u010dak<\/h2>\n
U ovom blog postu imali ste priliku vidjeti kako u Ionic 2<\/em> aplikaciju dohvatiti JSON <\/em>podatke s javnog API<\/em>-ja te ih prikazati u obliku popisa.<\/p>\n
Jednako tako, da smo htjeli, mogli smo koristiti i na\u0161 NodeJS API<\/em><\/a> kako bi prikazali korisnike iz na\u0161e baze podataka. Rezultat bi bio isti.<\/p>\n","protected":false},"excerpt":{"rendered":"
Iako su neke aplikacije same sebi dostatne ipak je vi\u0161e onih koje ovise o podacima s vanjskih izvora, a to su javni ili privatni API-ji. U ovom blog postu prikazat \u0107emo primjer dohva\u0107anja JSON (JavaScript Object Notation) podataka s javnog API-ja RandomUser.Me. Za\u0161to ba\u0161 RandomUser? Zato \u0161to na jednostavniji na\u010din, bez da kreirate i pokre\u0107ete … Nastavi \u010ditati Ionic 2 – prikaz JSON-a sa API-ja<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":4716,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[564,351],"tags":[376,381,384,383],"class_list":["post-4715","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mobile","category-razvoj","tag-api","tag-ionic-2","tag-json","tag-randomuserapi"],"yoast_head":"\nIonic 2 - prikaz JSON-a sa API-ja - Tomislav Stankovi\u0107<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.tomislavstankovic.com\/blog\/ionic2-prikaz-json-podatak-api\/\" \/>\n<meta property=\"og:locale\" content=\"hr_HR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ionic 2 - prikaz JSON-a sa API-ja - Tomislav Stankovi\u0107\" \/>\n<meta property=\"og:description\" content=\"Iako su neke aplikacije same sebi dostatne ipak je vi\u0161e onih koje ovise o podacima s vanjskih izvora, a to su javni ili privatni API-ji. 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