Created
September 21, 2016 13:20
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Testing Native Promise compatibility with indexedDB
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| <html> | |
| <script src="https://unpkg.com/dexie/dist/dexie.js"></script> | |
| <script> | |
| const log = txt => console.log(txt);//document.writeln(`${txt}<br/>`); | |
| log (`Hello world!`); | |
| let db = new Dexie ('db'); | |
| db.version(1).stores({ | |
| friends: '++id,name,age' | |
| }); | |
| db.on('populate', ()=>{ | |
| db.friends.add({name: "Foo", age: 37}); | |
| db.friends.add({name: "Bar", age: 42}); | |
| }); | |
| db.delete().then(()=>{ | |
| log(`Opening db`); | |
| return db.open(); | |
| }).then(()=>{ | |
| log(`db opened`); | |
| let idb = db.backendDB(); | |
| let tx = idb.transaction('friends', 'readwrite'); | |
| let store = tx.objectStore('friends'); | |
| return p(()=>store.get(1)).then(friend=>{ | |
| log(`Got: ${friend.name}`); | |
| return p(()=>store.get(2)); | |
| }).then(friend => { | |
| log(`Got: ${friend.name}`); | |
| return Promise.resolve().then(()=>Promise.resolve()).then(()=>Promise.resolve()); | |
| }).then(() => { | |
| return p(()=>store.add({name: "Another friend", age: 77})); | |
| }).then(id => { | |
| log(`Got another friend with id ${id}`); | |
| return p(()=>store.get(id)); | |
| }).then(friend => { | |
| log(`Got the value of the other friend: '${friend.name}'`); | |
| }).catch(err => log(`Error: ${err}`)); | |
| }).catch (err => log(`Error: ${err.stack || err}`)); | |
| function p (doer) { | |
| return new Promise((resolve, reject) => { | |
| let req = doer(); | |
| req.onsuccess = ev => resolve(ev.target.result); | |
| req.onerror = ev => reject(ev.target.error); | |
| }); | |
| } | |
| </script> | |
| </html> |
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