diff --git a/web/app/controllers/contest_inside.php b/web/app/controllers/contest_inside.php
index e40edc0..2cfaf32 100644
--- a/web/app/controllers/contest_inside.php
+++ b/web/app/controllers/contest_inside.php
@@ -80,12 +80,10 @@ if (UOJContest::cur()->userCanStartFinalTest(Auth::user())) {
 
 if ($cur_tab == 'dashboard') {
 	if ($contest['cur_progress'] <= CONTEST_IN_PROGRESS) {
-		$post_question = new UOJBs4Form('post_question');
-		$post_question->addVTextArea(
-			'qcontent',
-			'问题',
-			'',
-			function ($content, &$vdata) {
+		$post_question = new UOJForm('post_question');
+		$post_question->addTextArea('qcontent', [
+			'label' => '问题',
+			'validator_php' => function ($content, &$vdata) {
 				if (!Auth::check()) {
 					return '您尚未登录';
 				}
@@ -100,12 +98,11 @@ if ($cur_tab == 'dashboard') {
 
 				return '';
 			},
-			null
-		);
+		]);
 		$post_question->handle = function (&$vdata) use ($contest) {
 			DB::insert([
 				"insert into contests_asks",
-				"(contest_id, question, answer, username, post_time, is_hidden)",
+				DB::bracketed_fields(["contest_id", "question", "answer", "username", "post_time", "is_hidden"]),
 				"values", DB::tuple([$contest['id'], $vdata['content'], '', Auth::id(), DB::now(), 1])
 			]);
 		};
@@ -115,13 +112,11 @@ if ($cur_tab == 'dashboard') {
 	}
 } elseif ($cur_tab == 'backstage') {
 	if ($is_manager) {
-		$post_notice = new UOJBs4Form('post_notice');
-		$post_notice->addInput(
-			'title',
-			'text',
-			'标题',
-			'',
-			function ($title, &$vdata) {
+		$post_notice = new UOJForm('post_notice');
+		$post_notice->addInput('title', [
+			'div_class' => 'mb-3',
+			'label' => '标题',
+			'validator_php' => function ($title, &$vdata) {
 				if (!$title) {
 					return '标题不能为空';
 				}
@@ -130,13 +125,10 @@ if ($cur_tab == 'dashboard') {
 
 				return '';
 			},
-			null
-		);
-		$post_notice->addTextArea(
-			'content',
-			'正文',
-			'',
-			function ($content, &$vdata) {
+		]);
+		$post_notice->addTextArea('content', [
+			'label' => '正文',
+			'validator_php' => function ($content, &$vdata) {
 				if (!$content) {
 					return '公告不能为空';
 				}
@@ -145,8 +137,7 @@ if ($cur_tab == 'dashboard') {
 
 				return '';
 			},
-			null
-		);
+		]);
 		$post_notice->handle = function (&$vdata) use ($contest) {
 			DB::insert([
 				"insert into contests_notice",
@@ -160,7 +151,7 @@ if ($cur_tab == 'dashboard') {
 	}
 
 	if ($is_manager) {
-		$reply_question = new UOJBs4Form('reply_question');
+		$reply_question = new UOJForm('reply_question');
 		$reply_question->addHidden(
 			'rid',
 			'0',
@@ -183,18 +174,21 @@ if ($cur_tab == 'dashboard') {
 			},
 			null
 		);
-		$reply_question->addVSelect('rtype', [
-			'public' => '公开（如果该问题反复被不同人提出，或指出了题目中的错误，请选择该项）',
-			'private' => '非公开',
-			'statement' => '请仔细阅读题面（非公开）',
-			'no_comment' => '无可奉告（非公开）',
-			'no_play' => '请认真比赛（非公开）',
-		], '回复类型', 'private');
-		$reply_question->addVTextArea(
-			'rcontent',
-			'回复',
-			'',
-			function ($content, &$vdata) {
+		$reply_question->addSelect('rtype', [
+			'div_class' => 'mb-3',
+			'label' => '回复类型',
+			'default' => 'private',
+			'options' => [
+				'public' => '公开（如果该问题反复被不同人提出，或指出了题目中的错误，请选择该项）',
+				'private' => '非公开',
+				'statement' => '请仔细阅读题面（非公开）',
+				'no_comment' => '无可奉告（非公开）',
+				'no_play' => '请认真比赛（非公开）',
+			],
+		]);
+		$reply_question->addTextArea('rcontent', [
+			'label' => '回复',
+			'validator_php' => function ($content, &$vdata) {
 				if (!Auth::check()) {
 					return '您尚未登录';
 				}
@@ -209,9 +203,8 @@ if ($cur_tab == 'dashboard') {
 				$vdata['content'] = HTML::escape($content);
 				return '';
 			},
-			null
-		);
-		$reply_question->handle = function (&$vdata) use ($contest) {
+		]);
+		$reply_question->handle = function (&$vdata) {
 			$content = $vdata['content'];
 			$is_hidden = 1;
 			switch ($_POST['rtype']) {
diff --git a/web/app/models/UOJForm.php b/web/app/models/UOJForm.php
index b22e743..5c6320b 100644
--- a/web/app/models/UOJForm.php
+++ b/web/app/models/UOJForm.php
@@ -167,7 +167,7 @@ class UOJForm {
 		$this->add($name, $html, $config['validator_php'], $config['validator_js']);
 	}
 
-	public function addTextarea($name, $config) {
+	public function addTextArea($name, $config) {
 		$config += [
 			'type' => 'text',
 			'div_class' => '',