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April 8, 2016 12:42
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SW intercept JSON
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| { | |
| "foo": "bar", | |
| "baz": [ | |
| { "id": 1, "name": "one" }, | |
| { "id": 2, "name": "two" }, | |
| { "id": 3, "name": "three" }, | |
| { "id": 4, "name": "four" } | |
| ] | |
| } |
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>SW intercept JSON</title> | |
| </head> | |
| <body> | |
| <pre></pre> | |
| <script> | |
| if ('serviceWorker' in navigator) { | |
| navigator.serviceWorker.register('./sw.js') | |
| .then(function () { | |
| console.log('sw registered'); | |
| fetchDataAndPutInPre(); | |
| }) | |
| .catch(function () { | |
| console.log('sw : something went wrong'); | |
| }); | |
| } | |
| else { | |
| fetchDataAndPutInPre(); | |
| } | |
| function fetchDataAndPutInPre() { | |
| fetch('./data.json') | |
| .then(function (response) { | |
| return response.json(); | |
| }) | |
| .then(function (data) { | |
| document.querySelector('pre').innerHTML = JSON.stringify(data, null, ' '); | |
| }) | |
| .catch(function () { | |
| console.log('fetch : something went wrong'); | |
| }); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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| 'use strict'; | |
| self.addEventListener('fetch', function (event) { | |
| if (event.request.url.match(/\.json$/)) { | |
| event.respondWith( | |
| fetch(event.request) | |
| .then(function (response) { | |
| return response.json(); | |
| }) | |
| .then(function (data) { | |
| data.baz = data.baz.map(function (item) { | |
| return item.name; | |
| }); | |
| return new Response(JSON.stringify(data), { | |
| headers: { | |
| 'Content-Type': 'application/json', | |
| } | |
| }); | |
| }) | |
| .catch(function (err) { | |
| console.log(err, 'c la merde'); | |
| }) | |
| ); | |
| } | |
| }); |
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