core&ui: add homework files & enhance delete operation (#755)

packages/ui-default/pages/homework_edit.page.ts

@@ -0,0 +1,24 @@
+import $ from 'jquery';
+import { ConfirmDialog } from 'vj/components/dialog';
+import { NamedPage } from 'vj/misc/Page';
+import { i18n, request, tpl } from 'vj/utils';
+
+export default new NamedPage('homework_edit', () => {
+  let confirmed = false;
+  $(document).on('click', '[value="delete"]', (ev) => {
+    ev.preventDefault();
+    if (confirmed) {
+      return request.post('', { operation: 'delete' }).then((res) => {
+        window.location.href = res.url;
+      });
+    }
+    const message = 'Confirm deleting this homework? Its files and status will be deleted as well.';
+    return new ConfirmDialog({
+      $body: tpl.typoMsg(i18n(message)),
+    }).open().then((action) => {
+      if (action !== 'yes') return;
+      confirmed = true;
+      ev.target.click();
+    });
+  });
+});