On The Fly Zipping b4 upload (JS-Part)

assets/js/sections/adif.js

@@ -1,4 +1,37 @@
 $(document).ready(function(){
+	$('#prepare_sub').click(function(e){
+		e.preventDefault();
+
+		/* Make a zip file here */
+
+		var fi = document.getElementById("userfile");
+		var file = fi.files[0];;
+		var zip = new JSZip();
+
+		//add all files to zip 
+		addFileToZip(file);
+		function addFileToZip(n) {
+			var arrayBuffer;
+			var fileReader = new FileReader();
+			fileReader.onloadend = function() {
+				arrayBuffer = this.result;
+				zip.file(file.name, arrayBuffer, { binary:true });
+				zip.generateAsync({type:"blob", compression:"DEFLATE"}).then(function(content){
+
+					//generated zip content to file type
+					var files = new File([content], file.name);
+
+					const dataTransfer = new DataTransfer();
+    					dataTransfer.items.add(files);
+					//send generated file to server
+					fi.files=dataTransfer.files;
+					$("#upform").submit();
+					return;
+				});
+			};
+			fileReader.readAsArrayBuffer(file);
+		}
+	});
 	$('#markExportedToLotw').click(function(e){
 		let form = $(this).closest('form');
 		let station = form.find('select[name=station_profile]');
@@ -8,4 +41,4 @@ $(document).ready(function(){
 			form.submit();
 		}
 	})
-});
+});