Binary stream example using Fetch
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| <!DOCTYPE HTML> | |
| <html> | |
| <head> | |
| <title>Binary streaming using Fetch</title> | |
| </head> | |
| <body> | |
| <h1>Binary streaming using Fetch</h1> | |
| <img src=""> | |
| <script> | |
| let data = [] | |
| const processing = function (done, value) { | |
| if (done) { | |
| const img = new Blob(data, { type: 'image/png' }) | |
| document.querySelector('img').setAttribute('src', URL.createObjectURL(img)) | |
| return | |
| } | |
| // doing something with the data... | |
| data.push(value) | |
| } | |
| const url = 'https://loremflickr.com/1200/720/nature' | |
| const req = new Request(url) | |
| console.log('loading...') | |
| fetch(req) | |
| .then(response => { | |
| const reader = response.body.getReader(); | |
| const reading = function ({done, value}) { | |
| if (!done) { | |
| console.log('chunk loaded, size:', value.length) | |
| processing(false, value) | |
| reader.read().then(reading) | |
| } else { | |
| console.log('loaded!') | |
| processing(true) | |
| } | |
| } | |
| reader.read().then(reading) | |
| }) | |
| </script> | |
| </body> | |
| </html> |
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