|
| 1 | +/** |
| 2 | + * File Upload Drop Zone |
| 3 | + * |
| 4 | + * Enhances every .file-upload-zone element with drag-and-drop support and |
| 5 | + * visual feedback. Works with the file_input_widget.html partial. |
| 6 | + */ |
| 7 | +(function () { |
| 8 | + 'use strict'; |
| 9 | + |
| 10 | + function initFileUploadZone(zone) { |
| 11 | + var input = zone.querySelector('input[type="file"]'); |
| 12 | + var selectedEl = zone.querySelector('.file-upload-selected'); |
| 13 | + var selectedName = zone.querySelector('.file-upload-selected-name'); |
| 14 | + |
| 15 | + if (!input) return; |
| 16 | + |
| 17 | + function setFile(fileName) { |
| 18 | + if (fileName) { |
| 19 | + zone.classList.add('has-file'); |
| 20 | + if (selectedName) selectedName.textContent = fileName; |
| 21 | + } else { |
| 22 | + zone.classList.remove('has-file'); |
| 23 | + if (selectedName) selectedName.textContent = ''; |
| 24 | + } |
| 25 | + } |
| 26 | + |
| 27 | + // Native file picker selection |
| 28 | + input.addEventListener('change', function () { |
| 29 | + if (input.files && input.files.length > 0) { |
| 30 | + setFile(input.files[0].name); |
| 31 | + } else { |
| 32 | + setFile(null); |
| 33 | + } |
| 34 | + }); |
| 35 | + |
| 36 | + // Drag-and-drop support |
| 37 | + ['dragenter', 'dragover'].forEach(function (eventName) { |
| 38 | + zone.addEventListener(eventName, function (e) { |
| 39 | + e.preventDefault(); |
| 40 | + e.stopPropagation(); |
| 41 | + zone.classList.add('is-dragover'); |
| 42 | + }); |
| 43 | + }); |
| 44 | + |
| 45 | + ['dragleave', 'dragend'].forEach(function (eventName) { |
| 46 | + zone.addEventListener(eventName, function (e) { |
| 47 | + e.preventDefault(); |
| 48 | + e.stopPropagation(); |
| 49 | + zone.classList.remove('is-dragover'); |
| 50 | + }); |
| 51 | + }); |
| 52 | + |
| 53 | + zone.addEventListener('drop', function (e) { |
| 54 | + e.preventDefault(); |
| 55 | + e.stopPropagation(); |
| 56 | + zone.classList.remove('is-dragover'); |
| 57 | + |
| 58 | + var files = e.dataTransfer && e.dataTransfer.files; |
| 59 | + if (!files || files.length === 0) return; |
| 60 | + |
| 61 | + // Only accept the first file; rely on the accept attribute for filtering |
| 62 | + var accept = input.getAttribute('accept'); |
| 63 | + if (accept) { |
| 64 | + var accepted = accept.split(',').map(function (a) { return a.trim().toLowerCase(); }); |
| 65 | + var file = files[0]; |
| 66 | + var ext = '.' + file.name.split('.').pop().toLowerCase(); |
| 67 | + var mime = file.type.toLowerCase(); |
| 68 | + var allowed = accepted.some(function (pattern) { |
| 69 | + return pattern === ext || pattern === mime || (pattern.endsWith('/*') && mime.startsWith(pattern.slice(0, -1))); |
| 70 | + }); |
| 71 | + if (!allowed) return; |
| 72 | + } |
| 73 | + |
| 74 | + // Transfer file to the real input via DataTransfer |
| 75 | + try { |
| 76 | + var dt = new DataTransfer(); |
| 77 | + dt.items.add(files[0]); |
| 78 | + input.files = dt.files; |
| 79 | + setFile(files[0].name); |
| 80 | + input.dispatchEvent(new Event('change', { bubbles: true })); |
| 81 | + } catch (err) { |
| 82 | + // DataTransfer not supported — silently ignore |
| 83 | + } |
| 84 | + }); |
| 85 | + } |
| 86 | + |
| 87 | + document.addEventListener('DOMContentLoaded', function () { |
| 88 | + document.querySelectorAll('.file-upload-zone').forEach(function (zone) { |
| 89 | + initFileUploadZone(zone); |
| 90 | + }); |
| 91 | + }); |
| 92 | +})(); |
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