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example of file upload, conversion to blob and then download
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| <html> | |
| <head> | |
| <style> | |
| div { | |
| margin: 20px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <input type="file" id="your-files" multiple> | |
| <script> | |
| let input = document.querySelector('input[type=file]'); | |
| function readFile(event) { | |
| console.info('reading file ok', event.target.result); | |
| const data = event.target.result; | |
| const fileName = 'my-download.pdf'; | |
| saveData(data, fileName); | |
| } | |
| const changeFile = () => { | |
| let file = input.files[0]; | |
| let reader = new FileReader(); | |
| reader.addEventListener('load', readFile); | |
| reader.readAsDataURL(file); | |
| }; | |
| const saveData = (data, fileName) => { | |
| let a = document.createElement('a'); | |
| document.body.appendChild(a); | |
| a.style = 'display: none'; | |
| console.warn(fileName); | |
| fetch(data).then(res => res.blob()).then(blob => { | |
| url = window.URL.createObjectURL(blob); | |
| a.href = url; | |
| a.download = fileName; | |
| a.click(); | |
| console.warn(url); | |
| window.URL.revokeObjectURL(url); | |
| document.body.removeChild(a); | |
| }); | |
| }; | |
| input.addEventListener('change', changeFile); | |
| </script> | |
| </code> | |
| </body> | |
| </html> |
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