Created
November 22, 2017 17:11
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Async/Await example
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script> | |
| const validUrl = 'https://jsonplaceholder.typicode.com/posts'; | |
| const invalidUrl = 'https://jsonplaceholder.invalid.domain.com/posts'; | |
| function downloadData(url) { | |
| console.log(`[downloadData()] attempting AJAX request to ${url}`); | |
| return $.ajax({ | |
| url: url, | |
| type: 'GET' | |
| }); | |
| } | |
| function showCachedData() { | |
| return { | |
| status: 'error', | |
| data: {'some': 'data'} | |
| }; | |
| } | |
| /* ====================== | |
| ES6 Promise Version | |
| ==================== | |
| function getProcessedData() { | |
| return downloadData() | |
| .catch(e => { | |
| return {error: true, msg: e}; | |
| }) | |
| .then(v => { | |
| return v; | |
| }); | |
| } | |
| */ | |
| /* ====================== | |
| New Async/Await Version | |
| ==================== */ | |
| async function getProcessedData(url) { | |
| let v; | |
| try { | |
| v = await downloadData(url); | |
| } catch(e) { | |
| v = showCachedData(url); | |
| } | |
| console.log(v); | |
| return v; | |
| } | |
| </script> | |
| <title></title> | |
| </head> | |
| <body> | |
| <h2>Output in console.</h2> | |
| <button onclick="getProcessedData(validUrl)">Trigger Ajax Success</button> | |
| <button onclick="getProcessedData(invalidUrl)">Trigger Ajax Failure</button> | |
| </body> | |
| </html> |
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