added drag and drop option for file upload in Course and AssignmentTutor

source/AssignmentTutor.html

@@ -216,8 +216,22 @@
                     fileInput.click(); // Öffnet das Dateiauswahlfenster
                 });
 
+                uploadButton.addEventListener("dragover", (event)=> {
+                    event.preventDefault();
+                })
+
+                uploadButton.addEventListener("drop", (event)=>{
+                    event.preventDefault();
+                    const files = event.dataTransfer.files;
+                    handleFiles(files);
+                })
+
                 fileInput.addEventListener("change", (event) => {
                     const files = event.target.files; // Ausgewählte Dateien
+                    handleFiles(files);
+                });
+
+                function handleFiles(files){
                     uploadedFile.style.display = "block";
                     uploadedFile.innerHTML += `<br> ${files[0].name}`;
                     if (files.length > 0) {
@@ -244,7 +258,7 @@
                             );
                         }
                     }
-                });
+                }
 
                 submitButton.addEventListener("click", () => {
                     uploadedFile.innerHTML = "Uploaded Assignments: ";

source/Course.html

@@ -206,8 +206,21 @@
                 fileInput.click(); // Öffnet das Dateiauswahlfenster
             });
 
+            uploadButton.addEventListener("dragover", (event)=> {
+                event.preventDefault();
+            })
+
+            uploadButton.addEventListener("drop", (event)=>{
+                event.preventDefault();
+                const files = event.dataTransfer.files;
+                handleFiles(files);
+            })
+
             fileInput.addEventListener("change", (event) => {
                 const files = event.target.files; // Ausgewählte Dateien
+                handleFiles(files);
+            });
+            function handleFiles(files){
                 uploadedFile.style.display = "block";
                 uploadedFile.innerHTML += `<br> ${files[0].name}`;
                 if (files.length > 0) {
@@ -234,7 +247,7 @@
                         );
                     }
                 }
-            });
+            }
             submitButton.addEventListener("click", () => {
                 uploadedFile.innerHTML = "Uploaded Assignments: ";
                 uploadedFile.style.display = "none";