flatten pdf

src/main/resources/static/js/local-pdf-input-download.js

@@ -0,0 +1,47 @@
+async function downloadFilesWithCallback(processFileCallback) {
+    const fileInput = document.querySelector('input[type="file"]');
+    const files = fileInput.files;
+
+    const zipThreshold = 4;
+    const zipFiles = files.length > zipThreshold;
+
+    let jszip = null;
+    if (zipFiles) {
+        jszip = new JSZip();
+    }
+
+    const promises = Array.from(files).map(async file => {
+        const { processedData, fileName } = await processFileCallback(file);
+
+        if (zipFiles) {
+            jszip.file(fileName, processedData);
+        } else {
+            const url = URL.createObjectURL(processedData);
+            const downloadOption = localStorage.getItem('downloadOption');
+
+            if (downloadOption === 'sameWindow') {
+                window.location.href = url;
+            } else if (downloadOption === 'newWindow') {
+                window.open(url, '_blank');
+            } else {
+                const downloadLink = document.createElement('a');
+                downloadLink.href = url;
+                downloadLink.download = fileName;
+                downloadLink.click();
+            }
+        }
+    });
+
+    await Promise.all(promises);
+
+    if (zipFiles) {
+        const content = await jszip.generateAsync({ type: "blob" });
+        const url = URL.createObjectURL(content);
+        const a = document.createElement('a');
+        a.href = url;
+        a.download = "files.zip";
+        document.body.appendChild(a);
+        a.click();
+        a.remove();
+    }
+}