@hackplan/polaris
Version:
Shopify’s product component library
51 lines (50 loc) • 1.9 kB
JavaScript
const dragEvents = ['dragover', 'dragenter', 'drop'];
export function fileAccepted(file, accept) {
return file.type === 'application/x-moz-file' || accepts(file, accept);
}
export function getDataTransferFiles(event) {
if (isDragEvent(event) && event.dataTransfer) {
const dt = event.dataTransfer;
if (dt.files && dt.files.length) {
return Array.from(dt.files);
}
else if (dt.items && dt.items.length) {
// Chrome is the only browser that allows to read the file list on drag
// events and uses `items` instead of `files` in this case.
return Array.from(dt.items);
}
}
else if (isChangeEvent(event) && event.target.files) {
// Return files from even when a file was selected from an upload dialog
return Array.from(event.target.files);
}
return [];
}
function accepts(file, acceptedFiles) {
if (file && acceptedFiles) {
const fileName = file.name || '';
const mimeType = file.type || '';
const baseMimeType = mimeType.replace(/\/.*$/, '');
const acceptedFilesArray = Array.isArray(acceptedFiles)
? acceptedFiles
: acceptedFiles.split(',');
return acceptedFilesArray.some((type) => {
const validType = type.trim();
if (validType.charAt(0) === '.') {
return fileName.toLowerCase().endsWith(validType.toLowerCase());
}
else if (/\/\*$/.test(validType)) {
// This is something like a image/* mime type
return baseMimeType === validType.replace(/\/.*$/, '');
}
return mimeType === validType;
});
}
return true;
}
function isDragEvent(event) {
return dragEvents.indexOf(event.type) > 0;
}
function isChangeEvent(event) {
return event.hasOwnProperty('target');
}