initila check if vorgang exists

src/routes/(angemeldet)/upload/+page.svelte

@@ -17,6 +17,8 @@
 	const code_len = 8;
 	let zugangscode = Math.random().toString(36).slice(2, 2+code_len);
 	let case_existing = undefined;
+	$: case_existing = false;
+
 	let name = '';
 	/** @type {?string}*/
 	let etag = null;
@@ -149,22 +151,27 @@
 
 	// return true or false
 	async function case_exists(case_no) {
-		console.log('--- fired')
 		// ping `/(angemeldet)/view` with caseNumber in POST body
 		let url = '/view'
 		let data = new FormData();
 		data.append('caseNumber', case_no);
-		const response = await fetch(url, { method: 'POST', body: data })
+		const response = await fetch(url, {
+			method: 'POST',
+			body: data,
+			redirect: 'error'
+			})
 
-		const code = response.status;
+		const res_json = await response.json();
+		const status = res_json.status;
 
-		console.log(`+++ ${response.redirected}`)
 
-		if (code == 303) {
-			return true;
+		if (status == 303) {
+			console.log(`+ existiert`)
+			case_existing = true;
+			return;
 		}
 
-		return false;
+		case_existing = false;
 	}
 
 </script>
@@ -208,6 +215,11 @@
 						{#if formErrors?.vorgang}
 							<p class="block text-sm leading-6 text-red-900 mt-2">{formErrors.vorgang}</p>
 						{/if}
+						{#if case_existing}
+							<span>Datei wird zum existierenden Vorgang hinzugefügt.</span>
+						{:else}
+							<span>Neuer Vorgang wird angelegt.</span>
+						{/if}
 					</div>
 
 					<div>