Created
April 1, 2019 14:48
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Promises exercise
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| { | |
| "id": 1, | |
| "name": "Michael", | |
| "lastname": "Rivers" | |
| } |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script src="https://cdn.jsdelivr.net/npm/jquery@3.3.1/dist/jquery.js"></script> | |
| <script language="javascript" src="index.js" ></script> | |
| </head> | |
| <body> | |
| <div class="main"></div> | |
| </body> | |
| </html> |
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| const wait = ms => new Promise(resolve => setTimeout(resolve, ms)) | |
| function log(s) { | |
| $('.main').append($('<div class="message">' + s + '</div>')) | |
| } | |
| const doGet = (url) => new Promise((resolve, reject) => { | |
| $.ajax({ | |
| url: url, | |
| dataType: 'JSON', | |
| success: function(data) { return resolve(data) }, | |
| error: function() { return reject() } | |
| }) | |
| }) | |
| async function runMore() { | |
| var result = await doGet('file.json') | |
| log(result.lastname) | |
| } | |
| $(function() { | |
| // const p = Promise.resolved | |
| // p.then(result => runMore()) | |
| new Promise((resolve, reject) => { | |
| log("Initial"); | |
| resolve("something interesting"); | |
| }) | |
| .then((result) => { | |
| log("Second: " + result); | |
| }) | |
| .then(_ => { | |
| log("third log msg.") | |
| }) | |
| .catch(_ => { | |
| log("error occurred.") | |
| }) | |
| .then(_ => log("no matter what.")) | |
| wait(1000) | |
| .then(_ => { | |
| log("Interesting post.") | |
| }) | |
| .then(_ => wait(2000)) | |
| .then(_ => log("another interesting post.")) | |
| wait(1000) | |
| .then(_ => { | |
| doGet('NOT_ON_SERVER.json') | |
| .then(data => log("got very interesting json: " + data.name)) | |
| .catch(_ => log("unable to find anything.")) | |
| }) | |
| runMore() | |
| }); | |
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