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July 7, 2021 02:34
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MDN: Complete file example (Adapted for IE11)
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| <!-- | |
| Removed ES2015 syntaxes for Internet Explorer 11: https://mdn.github.io/learning-area/html/forms/file-examples/file-example.html | |
| <input type="file"> - HTML: HyperText Markup Language | MDN https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/file | |
| --> | |
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Complete file example</title> | |
| <style> | |
| html { | |
| font-family: sans-serif; | |
| } | |
| form { | |
| width: 600px; | |
| background: #ccc; | |
| margin: 0 auto; | |
| padding: 20px; | |
| border: 1px solid black; | |
| } | |
| form ol { | |
| padding-left: 0; | |
| } | |
| form li, div > p { | |
| background: #eee; | |
| display: flex; | |
| justify-content: space-between; | |
| margin-bottom: 10px; | |
| list-style-type: none; | |
| border: 1px solid black; | |
| } | |
| form img { | |
| height: 64px; | |
| order: 1; | |
| } | |
| form p { | |
| line-height: 32px; | |
| padding-left: 10px; | |
| } | |
| form label, form button { | |
| background-color: #7F9CCB; | |
| padding: 5px 10px; | |
| border-radius: 5px; | |
| border: 1px ridge black; | |
| font-size: 0.8rem; | |
| height: auto; | |
| } | |
| form label:hover, form button:hover { | |
| background-color: #2D5BA3; | |
| color: white; | |
| } | |
| form label:active, form button:active { | |
| background-color: #0D3F8F; | |
| color: white; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <form> | |
| <div> | |
| <label for="image_uploads">Choose images to upload (PNG, JPG)</label> | |
| <input type="file" id="image_uploads" name="image_uploads" accept=".jpg, .jpeg, .png" multiple> | |
| </div> | |
| <div class="preview"> | |
| <p>No files currently selected for upload</p> | |
| </div> | |
| <div> | |
| <button>Submit</button> | |
| </div> | |
| </form> | |
| <script> | |
| var input = document.querySelector('input'); | |
| var preview = document.querySelector('.preview'); | |
| input.style.opacity = 0; | |
| input.addEventListener('change', updateImageDisplay); | |
| function updateImageDisplay() { | |
| while(preview.firstChild) { | |
| preview.removeChild(preview.firstChild); | |
| } | |
| var curFiles = input.files; | |
| if(curFiles.length === 0) { | |
| var para = document.createElement('p'); | |
| para.textContent = 'No files currently selected for upload'; | |
| preview.appendChild(para); | |
| } else { | |
| var list = document.createElement('ol'); | |
| preview.appendChild(list); | |
| for(var fileIndex = 0; fileIndex < curFiles.length; fileIndex++) { | |
| var file = curFiles[fileIndex]; | |
| var listItem = document.createElement('li'); | |
| var para = document.createElement('p'); | |
| if(validFileType(file)) { | |
| para.textContent = 'File name ' + file.name + ', file size ' + returnFileSize(file.size) + '.'; | |
| var image = document.createElement('img'); | |
| image.src = URL.createObjectURL(file); | |
| listItem.appendChild(image); | |
| listItem.appendChild(para); | |
| } else { | |
| para.textContent = 'File name ' + file.name + ': Not a valid file type. Update your selection.'; | |
| listItem.appendChild(para); | |
| } | |
| list.appendChild(listItem); | |
| } | |
| } | |
| } | |
| // https://developer.mozilla.org/en-US/docs/Web/Media/Formats/Image_types | |
| var fileTypes = [ | |
| 'image/apng', | |
| 'image/bmp', | |
| 'image/gif', | |
| 'image/jpeg', | |
| 'image/pjpeg', | |
| 'image/png', | |
| 'image/svg+xml', | |
| 'image/tiff', | |
| 'image/webp', | |
| 'image/x-icon' | |
| ]; | |
| function validFileType(file) { | |
| return fileTypes.indexOf(file.type) >= 0; | |
| } | |
| function returnFileSize(number) { | |
| if(number < 1024) { | |
| return number + 'bytes'; | |
| } else if(number > 1024 && number < 1048576) { | |
| return (number/1024).toFixed(1) + 'KB'; | |
| } else if(number > 1048576) { | |
| return (number/1048576).toFixed(1) + 'MB'; | |
| } | |
| } | |
| </script> | |
| </body> | |
| </html> |
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