{"id":6829,"date":"2018-01-07T19:20:19","date_gmt":"2018-01-07T17:20:19","guid":{"rendered":"https:\/\/www.tomislavstankovic.com\/blog\/?p=6829"},"modified":"2019-01-05T19:51:14","modified_gmt":"2019-01-05T17:51:14","slug":"ionic-3-spremanje-slanje-podataka-nema-interneta","status":"publish","type":"post","link":"https:\/\/www.tomislavstankovic.com\/blog\/ionic-3-spremanje-slanje-podataka-nema-interneta\/","title":{"rendered":"Ionic 3 &#8211; Spremanje i slanje podataka kada nema interneta"},"content":{"rendered":"<p>Jedna od osnovnih funkcionalnosti koju volim vidjeti u mobilnim aplikacijama je mogu\u0107nost rada izvan mre\u017ee (<em>offline<\/em>) tj. kada mobilni ure\u0111aj nije povezan s internetom. <\/p>\n<p>Pretpostavimo da aplikacija ima nekakvu formu za unos koju je potrebno ispuniti i da se klikom na gumb &#8216;Po\u0161alji podatke&#8217; ni\u0161ta ne doga\u0111a. Mo\u017eda tek eventualno bude nekakva poruka da trenutno nema mre\u017ene povezanosti i zato nije mogu\u0107e spremiti unesene podatke. Najgora stvar koja se onda mo\u017ee dogoditi je da aplikacija ne zapamti unesene podatke i da ih korisnik kasnije mora ponovno upisivati. <\/p>\n<p>U ovom \u0107u blog postu obraditi scenarij mobilne aplikacija koja ima nekakvu formu za unos koju je mogu\u0107e ispuniti i spremiti podatke neovisno i povezanosti s internetom. Korisniku je najbitnije da ne mora vi\u0161e puta unositi podatke ili razmi\u0161ljati za\u0161to ih nije u mogu\u0107nosti spremiti. <\/p>\n<h2>Provjera povezanosti s mre\u017eom<\/h2>\n<p><a href=\"https:\/\/www.tomislavstankovic.com\/blog\/ionic2-provjera-povezanost-mreza-internet\/\" rel=\"noopener\" target=\"_blank\">O ovoj sam temi tako\u0111er objavio blog post<\/a>. Prije svega moram nekako dobiti informaciju postoji li povezanost s internetom ili ne. U slu\u010daju <em>Ionica<\/em> to se saznaje koriste\u0107i <em>Ionic Native <a href=\"https:\/\/ionicframework.com\/docs\/native\/network\/\" rel=\"noopener\" target=\"_blank\">Network plugin<\/a><\/em>.<\/p>\n<p>Napravim servis npr. <strong>network-service.ts<\/strong> kojemu \u0107e jedina i osnovna svrha biti provjera povezanosti s internetom. Dalje, na svakoj stranici mobilne aplikacije pozivam taj servis ili prilikom klika na gumb &#8216;Po\u0161alji podatke&#8217; i ako dobijem informaciju da nema povezanosti s internetom automatski znam da ne\u0161to drugo s tim podacima trebam u\u010diniti, a to je &#8211; spremiti ih u lokalnu bazu podataka. <\/p>\n<pre class=\"lang:js decode:true \" > provjeraInterneta(){\r\n      if(this._networkService.isOnline()){\r\n       console.log('Ima interneta!');\r\n       \/\/Odmah \u0161alji podatke na API\r\n        }else{\r\n        console.log('Nema interneta!');\r\n        \/\/Spremi podatke u SQLite bazu\r\n    }\r\n}<\/pre>\n<h2>Spremanje podataka u lokalnu SQLite bazu<\/h2>\n<p><a href=\"https:\/\/www.tomislavstankovic.com\/blog\/ionic-2-3-sqlite-servis\/\" rel=\"noopener\" target=\"_blank\">O ovoj sam temi tako\u0111er objavio blog post<\/a>. Kada sam u prethodnom koraku dobio informaciju da ne postoji povezanost s internetom odlu\u010dujem se na spremanje podataka lokalno na mobilni ure\u0111aj. Kako bi to mogao u\u010diniti moram prvo kreirati lokalnu bazu podataka, a to \u010dinim koriste\u0107i <em>Ionic Native <a href=\"https:\/\/ionicframework.com\/docs\/native\/sqlite\/\" rel=\"noopener\" target=\"_blank\">SQLite plugin<\/a><\/em>.<\/p>\n<p>Najbolje je opet napraviti poseban servis, npr. <strong>database-service.ts<\/strong>, koji \u0107e slu\u017eiti za sve radnje (kreiranje baze, kreiranje tablica, spremanje, prikaz i brisanje podataka) povezane sa <em>SQLite<\/em> bazom.<\/p>\n<p>Klikom na gumb &#8216;Po\u0161alji podatke&#8217; sada se doga\u0111a sljede\u0107e. U <em>SQLite<\/em> tablicu <span class=\"lang:js decode:true crayon-inline\">mojaLokalnaTablica<\/span> spremam podatke unesene u formu. Podaci su u obliku objekta <span class=\"lang:js decode:true crayon-inline\">this.podaciIzForme<\/span>. <\/p>\n<pre class=\"lang:js decode:true\">provjeraInterneta(){\r\n      if(this._networkService.isOnline()){\r\n       console.log('Ima interneta!');\r\n       \/\/Odmah \u0161alji podatke na API\r\n        }else{\r\n        console.log('Nema interneta!');\r\n        this._database.mojaLokalnaTablica(this.podaciIzForme);\r\n    }\r\n}<\/pre>\n<p>Na ovaj na\u010din korisnik mo\u017ee bez problema unositi podatke neovisno o povezanosti s internetom jer \u0107e se svi podaci spremiti u lokalnu <em>SQLite<\/em> bazu podataka koja se nalazi na mobilnom ure\u0111aju.<\/p>\n<p>Korisno je dati korisniku i <a href=\"https:\/\/www.tomislavstankovic.com\/blog\/ionic2-toast-obavijesti\/\" rel=\"noopener\" target=\"_blank\">nekakvu obavijest<\/a> o ne postojanju povezanosti s internetom \u010disto iz razloga ako se odlu\u010di npr. oti\u0107i na ra\u010dunalo i u nekakvoj web aplikaciji provjeriti podatke koje je maloprije poslao, da se ne iznenadi ako ih u tom trenutku ne vidi. Bitno je da su podaci spremljeni i da \u0107e biti poslani \u010dim se ostvari povezanost s internetom. <\/p>\n<h2>Automatsko slanje podataka \/ sinkronizacija<\/h2>\n<p>Sada dolazim do dijela koji je u ovoj pri\u010di najva\u017eniji. Zna\u010di, korisnik je bez problema koristio mobilnu aplikaciju i nekoliko puta unosio razli\u010dite podatke u formu za unos i svi ti podaci su privremeno spremljeni u lokalnu <em>SQLite<\/em> bazu podataka. <\/p>\n<p>U ovom je koraku klju\u010dno prepoznati trenutak kada se ponovno uspostavi povezanost s internetom i sve ranije spremljene <a href=\"https:\/\/www.tomislavstankovic.com\/blog\/ionic3-slanje-podataka-api\/\" rel=\"noopener\" target=\"_blank\">podatke poslati na <em>API<\/em><\/a> te istovremeno isprazniti lokalnu bazu podataka.<\/p>\n<p>Na po\u010detnoj stranici mobilne aplikacije mogu pozvati funkciju  <span class=\"lang:js decode:true  crayon-inline\">provjeraInterneta()<\/span>  koja \u0107e svaki put kada se do\u0111e na po\u010detnu stranicu provjeravati postoji li povezanost s internetom i ako postoji odmah \u0107e poslati sve lokalne podatke te isprazniti lokalnu bazu.<\/p>\n<pre class=\"lang:js decode:true \" >provjeraInterneta(){\r\n      if(this._networkService.isOnline()){\r\n       console.log('Ima interneta!');\r\n         this.posaljiLokalnePodatke();\r\n        }else{\r\n        console.log('Ne \u0161aljem podatke! Nema interneta!');\r\n    }\r\n}<\/pre>\n<p>Sada na po\u010detnoj stranici radim sljede\u0107e. Pozivam servis koji provjerava povezanost s internetom. Ako postoji veza s internetom pozivam funkciju <span class=\"lang:js decode:true  crayon-inline\">posaljiLokalnePodatke()<\/span>. Ta funkcija dohva\u0107a niz (<em>array<\/em>) svih objekata koji su spremljeni u lokalnu <em>SQLite<\/em> bazu i \u0161aljem ih na <em>API<\/em>. Kada stigne odgovor od <em>API<\/em>-ja da su podaci uspje\u0161no primljeni kre\u0107em s brisanjem lokalne baze podataka  <span class=\"lang:js decode:true  crayon-inline \" >this._database.isprazniLokalnuTablicu()<\/span>.<\/p>\n<pre class=\"lang:js decode:true   \" >posaljiLokalnePodatke(){\r\n     this._database.getOfflineTable().then((result) =&gt; {\r\n            this.mojaLokalnaTablicaNiz = &lt;Array&lt;Object&gt;&gt; result;\r\n            if(this.mojaLokalnaTablica.length != 0){\r\n            for(var i = 0; i &lt; this.mojaLokalnaTablica.length; i++){\r\n              this._api.posaljiPodatke(this.mojaLokalnaTablica[i]).subscribe(res =&gt; {\r\n              if(res.status == true){\r\n                 this._database.isprazniLokalnuTablicu();\r\n              }\r\n         }); \r\n            }}\r\n        }, (error) =&gt; {\r\n            console.log(\"ERROR: \", error);\r\n        });\r\n   }<\/pre>\n<h2>Zaklju\u010dak<\/h2>\n<p>Ovo je pojednostavljeni primjer kako korisnicima mobilne aplikacije omogu\u0107iti da unose podatke i onda kada ne postoji povezanost s internetom. <\/p>\n","protected":false},"excerpt":{"rendered":"<p>Jedna od osnovnih funkcionalnosti koju volim vidjeti u mobilnim aplikacijama je mogu\u0107nost rada izvan mre\u017ee (offline) tj. kada mobilni ure\u0111aj nije povezan s internetom. Pretpostavimo da aplikacija ima nekakvu formu za unos koju je potrebno ispuniti i da se klikom na gumb &#8216;Po\u0161alji podatke&#8217; ni\u0161ta ne doga\u0111a. Mo\u017eda tek eventualno bude nekakva poruka da trenutno &hellip; <a href=\"https:\/\/www.tomislavstankovic.com\/blog\/ionic-3-spremanje-slanje-podataka-nema-interneta\/\" class=\"more-link\">Nastavi \u010ditati <span class=\"screen-reader-text\">Ionic 3 &#8211; Spremanje i slanje podataka kada nema interneta<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":6831,"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":[352,400,13],"class_list":["post-6829","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mobile","category-razvoj","tag-ionic","tag-ionic-3","tag-offline"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ionic 3 - Spremanje i slanje podataka kada nema interneta - 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\/ionic-3-spremanje-slanje-podataka-nema-interneta\/\" \/>\n<meta property=\"og:locale\" content=\"hr_HR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ionic 3 - Spremanje i slanje podataka kada nema interneta - Tomislav Stankovi\u0107\" \/>\n<meta property=\"og:description\" content=\"Jedna od osnovnih funkcionalnosti koju volim vidjeti u mobilnim aplikacijama je mogu\u0107nost rada izvan mre\u017ee (offline) tj. kada mobilni ure\u0111aj nije povezan s internetom. Pretpostavimo da aplikacija ima nekakvu formu za unos koju je potrebno ispuniti i da se klikom na gumb &#8216;Po\u0161alji podatke&#8217; ni\u0161ta ne doga\u0111a. 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