diff --git a/htdocs/js/AchievementList/achievementlist.js b/htdocs/js/AchievementList/achievementlist.js
index 878a90fe8c..ae4e8059cd 100644
--- a/htdocs/js/AchievementList/achievementlist.js
+++ b/htdocs/js/AchievementList/achievementlist.js
@@ -1,20 +1,48 @@
 (() => {
 	// Action form validation.
+	const show_errors = (ids, elements) => {
+		for (const id of ids) elements.push(document.getElementById(id));
+		for (const element of elements) {
+			if (element?.id.endsWith('_err_msg')) {
+				element?.classList.remove('d-none');
+			} else {
+				element?.classList.add('is-invalid');
+				element?.addEventListener('change', hide_errors([], elements));
+			}
+		}
+	};
+
+	const hide_errors = (ids, elements) => {
+		return () => {
+			for (const id of ids) elements.push(document.getElementById(id));
+			for (const element of elements) {
+				if (element?.id.endsWith('_err_msg')) {
+					element?.classList.add('d-none');
+					if (element.id === 'select_achievement_err_msg')
+						document.getElementById('achievement-table')?.removeEventListener('change', hide_errors);
+				} else {
+					element?.classList.remove('is-invalid');
+					element?.removeEventListener('change', hide_errors);
+				}
+			}
+		};
+	};
+
 	const is_achievement_selected = () => {
 		for (const achievement of document.getElementsByName('selected_achievements')) {
 			if (achievement.checked) return true;
 		}
-		document.getElementById('select_achievement_err_msg')?.classList.remove('d-none');
-		document.getElementById('achievement-table')?.addEventListener(
-			'change',
-			() => {
-				document.getElementById('select_achievement_err_msg')?.classList.add('d-none');
-				for (const id of ['filter_select', 'edit_select', 'assign_select', 'export_select', 'score_select']) {
-					document.getElementById(id)?.classList.remove('is-invalid');
-				}
-			},
-			{ once: true }
-		);
+		const err_msg = document.getElementById('select_achievement_err_msg');
+		err_msg?.classList.remove('d-none');
+		document
+			.getElementById('achievement-table')
+			?.addEventListener(
+				'change',
+				hide_errors(
+					['filter_select', 'edit_select', 'assign_select', 'export_select', 'score_select'],
+					[err_msg]
+				)
+			);
 		return false;
 	};
 
@@ -28,158 +56,41 @@
 			if (filter === 'selected' && !is_achievement_selected()) {
 				e.preventDefault();
 				e.stopPropagation();
-				filter_select?.classList.add('is-invalid');
-				filter_select?.addEventListener(
-					'change',
-					() => {
-						document.getElementById('select_achievement_err_msg').classList.add('d-none');
-						document.getElementById('filter_select').classList.remove('is-invalid');
-					},
-					{ once: true }
-				);
+				show_errors(['select_achievement_err_msg'], [filter_select]);
 			} else if (filter === 'match_ids' && filter_text?.value === '') {
 				e.preventDefault();
 				e.stopPropagation();
-				document.getElementById('filter_text_err_msg')?.classList.remove('d-none');
-				filter_select?.classList.add('is-invalid');
-				filter_text?.classList.add('is-invalid');
-				filter_text?.addEventListener(
-					'change',
-					() => {
-						document.getElementById('filter_text_err_msg')?.classList.add('d-none');
-						document.getElementById('filter_text')?.classList.remove('is-invalid');
-						document.getElementById('filter_select')?.classList.remove('is-invalid');
-					},
-					{ once: true }
-				);
-				filter_select?.addEventListener(
-					'change',
-					() => {
-						document.getElementById('filter_text_err_msg')?.classList.add('d-none');
-						document.getElementById('filter_text')?.classList.remove('is-invalid');
-						document.getElementById('filter_select')?.classList.remove('is-invalid');
-					},
-					{ once: true }
-				);
+				show_errors(['filter_text_err_msg'], [filter_select, filter_text]);
 			} else if (filter === 'match_category' && filter_category?.value === '') {
 				e.preventDefault();
 				e.stopPropagation();
-				document.getElementById('filter_category_err_msg')?.classList.remove('d-none');
-				filter_select?.classList.add('is-invalid');
-				filter_category?.classList.add('is-invalid');
-				filter_category?.addEventListener(
-					'change',
-					() => {
-						document.getElementById('filter_category_err_msg')?.classList.add('d-none');
-						document.getElementById('filter_category')?.classList.remove('is-invalid');
-						document.getElementById('filter_select')?.classList.remove('is-invalid');
-					},
-					{ once: true }
-				);
-				filter_select?.addEventListener(
-					'change',
-					() => {
-						document.getElementById('filter_category_err_msg')?.classList.add('d-none');
-						document.getElementById('filter_category')?.classList.remove('is-invalid');
-						document.getElementById('filter_select')?.classList.remove('is-invalid');
-					},
-					{ once: true }
-				);
-			}
-		} else if (action === 'edit') {
-			const edit_select = document.getElementById('edit_select');
-			if (edit_select.value === 'selected' && !is_achievement_selected()) {
-				e.preventDefault();
-				e.stopPropagation();
-				edit_select.classList.add('is-invalid');
-				edit_select.addEventListener(
-					'change',
-					() => {
-						document.getElementById('select_achievement_err_msg')?.classList.add('d-none');
-						document.getElementById('edit_select')?.classList.remove('is-invalid');
-					},
-					{ once: true }
-				);
+				show_errors(['filter_category_err_msg'], [filter_select, filter_category]);
 			}
-		} else if (action === 'assign') {
-			const assign_select = document.getElementById('assign_select');
-			if (assign_select.value === 'selected' && !is_achievement_selected()) {
+		} else if (['edit', 'assign', 'export', 'score'].includes(action)) {
+			const action_select = document.getElementById(`${action}_select`);
+			if (action_select.value === 'selected' && !is_achievement_selected()) {
 				e.preventDefault();
 				e.stopPropagation();
-				assign_select.classList.add('is-invalid');
-				assign_select.addEventListener(
-					'change',
-					() => {
-						document.getElementById('select_achievement_err_msg')?.classList.add('d-none');
-						document.getElementById('assign_select')?.classList.remove('is-invalid');
-					},
-					{ once: true }
-				);
+				show_errors(['select_achievement_err_msg'], [action_select]);
 			}
 		} else if (action === 'import') {
 			const import_file = document.getElementById('import_file_select');
 			if (!import_file.value.endsWith('.axp')) {
 				e.preventDefault();
 				e.stopPropagation();
-				document.getElementById('import_file_err_msg')?.classList.remove('d-none');
-				import_file.classList.add('is-invalid');
-				import_file.addEventListener(
-					'change',
-					() => {
-						document.getElementById('import_file_err_msg')?.classList.add('d-none');
-						document.getElementById('import_file_select')?.classList.remove('is-invalid');
-					},
-					{ once: true }
-				);
-			}
-		} else if (action === 'export') {
-			const export_select = document.getElementById('export_select');
-			if (export_select.value === 'selected' && !is_achievement_selected()) {
-				e.preventDefault();
-				e.stopPropagation();
-				export_select.classList.add('is-invalid');
-				export_select.addEventListener(
-					'change',
-					() => {
-						document.getElementById('select_achievement_err_msg')?.classList.add('d-none');
-						document.getElementById('export_select')?.classList.remove('is-invalid');
-					},
-					{ once: true }
-				);
-			}
-		} else if (action === 'score') {
-			const score_select = document.getElementById('score_select');
-			if (export_select.value === 'selected' && !is_achievement_selected()) {
-				e.preventDefault();
-				e.stopPropagation();
-				score_select.classList.add('is-invalid');
-				score_select.addEventListener(
-					'change',
-					() => {
-						document.getElementById('select_achievement_err_msg')?.classList.add('d-none');
-						document.getElementById('score_select')?.classList.remove('is-invalid');
-					},
-					{ once: true }
-				);
+				show_errors(['import_file_err_msg'], [import_file]);
 			}
 		} else if (action === 'create') {
 			const create_text = document.getElementById('create_text');
+			const create_select = document.getElementById('create_select');
 			if (create_text.value === '') {
 				e.preventDefault();
 				e.stopPropagation();
-				document.getElementById('create_file_err_msg')?.classList.remove('d-none');
-				create_text.classList.add('is-invalid');
-				create_text.addEventListener(
-					'change',
-					() => {
-						document.getElementById('create_file_err_msg')?.classList.add('d-none');
-						document.getElementById('create_text')?.classList.remove('is-invalid');
-					},
-					{ once: true }
-				);
-			} else if (document.getElementById('create_select')?.value == 'copy' && !is_achievement_selected()) {
+				show_errors(['create_file_err_msg'], [create_text]);
+			} else if (create_select?.value == 'copy' && !is_achievement_selected()) {
 				e.preventDefault();
 				e.stopPropagation();
+				show_errors(['select_achievement_err_msg'], [create_select]);
 			}
 		} else if (action === 'delete') {
 			const delete_confirm = document.getElementById('delete_select');
@@ -189,16 +100,7 @@
 			} else if (delete_confirm.value != 'yes') {
 				e.preventDefault();
 				e.stopPropagation();
-				document.getElementById('delete_confirm_err_msg')?.classList.remove('d-none');
-				delete_confirm.classList.add('is-invalid');
-				delete_confirm.addEventListener(
-					'change',
-					() => {
-						document.getElementById('delete_select')?.classList.remove('is-invalid');
-						document.getElementById('delete_confirm_err_msg')?.classList.add('d-none');
-					},
-					{ once: true }
-				);
+				show_errors(['delete_confirm_err_msg'], [delete_confirm]);
 			}
 		}
 	});
@@ -206,13 +108,10 @@
 	// Remove all error messages when changing tabs.
 	for (const tab of document.querySelectorAll('a[data-bs-toggle="tab"]')) {
 		tab.addEventListener('shown.bs.tab', () => {
-			const actionForm = document.getElementById('achievement-list');
-			for (const err_msg of actionForm.querySelectorAll('div[id$=_err_msg]')) {
-				err_msg.classList.add('d-none');
-			}
-			for (const invalid of actionForm.querySelectorAll('.is-invalid')) {
-				invalid.classList.remove('is-invalid');
-			}
+			hide_errors(
+				[],
+				document.getElementById('achievement-list')?.querySelectorAll('div[id$=_err_msg], .is-invalid')
+			)();
 		});
 	}
 
@@ -223,7 +122,7 @@
 	const filterElementToggle = () => {
 		if (filter_select?.value === 'match_ids') filter_text_elements.style.display = 'flex';
 		else filter_text_elements.style.display = 'none';
-		if (filter_select?.value === 'match_category' ) filter_category_elements.style.display = 'flex';
+		if (filter_select?.value === 'match_category') filter_category_elements.style.display = 'flex';
 		else filter_category_elements.style.display = 'none';
 	};
 
diff --git a/htdocs/js/ProblemSetList/problemsetlist.js b/htdocs/js/ProblemSetList/problemsetlist.js
index bdcfd6814a..7eaec0261f 100644
--- a/htdocs/js/ProblemSetList/problemsetlist.js
+++ b/htdocs/js/ProblemSetList/problemsetlist.js
@@ -1,157 +1,96 @@
 (() => {
 	// Action form validation.
+	const show_errors = (ids, elements) => {
+		for (const id of ids) elements.push(document.getElementById(id));
+		for (const element of elements) {
+			if (element?.id.endsWith('_err_msg')) {
+				element?.classList.remove('d-none');
+			} else {
+				element?.classList.add('is-invalid');
+				element?.addEventListener('change', hide_errors([], elements));
+			}
+		}
+	};
+
+	const hide_errors = (ids, elements) => {
+		return () => {
+			for (const id of ids) elements.push(document.getElementById(id));
+			for (const element of elements) {
+				if (element?.id.endsWith('_err_msg')) {
+					element?.classList.add('d-none');
+					if (element.id === 'select_set_err_msg')
+						document.getElementById('set_table_id')?.removeEventListener('change', hide_errors);
+				} else {
+					element?.classList.remove('is-invalid');
+					element?.removeEventListener('change', hide_errors);
+				}
+			}
+		};
+	};
+
 	const is_set_selected = () => {
 		for (const set of document.getElementsByName('selected_sets')) {
 			if (set.checked) return true;
 		}
-		document.getElementById('select_set_err_msg')?.classList.remove('d-none');
-		document.getElementById('set_table_id')?.addEventListener(
-			'change',
-			() => {
-				document.getElementById('select_set_err_msg')?.classList.add('d-none');
-				for (const id of [
-					'filter_select',
-					'edit_select',
-					'publish_filter_select',
-					'export_select',
-					'score_select'
-				]) {
-					document.getElementById(id)?.classList.remove('is-invalid');
-				}
-			},
-			{ once: true }
-		);
+		const err_msg = document.getElementById('select_set_err_msg');
+		err_msg?.classList.remove('d-none');
+		document
+			.getElementById('set_table_id')
+			?.addEventListener(
+				'change',
+				hide_errors(
+					['filter_select', 'edit_select', 'publish_filter_select', 'export_select', 'score_select'],
+					[err_msg]
+				)
+			);
 		return false;
 	};
 
 	document.getElementById('problemsetlist')?.addEventListener('submit', (e) => {
 		const action = document.getElementById('current_action')?.value || '';
 		if (action === 'filter') {
-			const filter = document.getElementById('filter_select')?.value || '';
+			const filter_select = document.getElementById('filter_select');
+			const filter = filter_select?.value || '';
 			const filter_text = document.getElementById('filter_text');
 			if (filter === 'selected' && !is_set_selected()) {
 				e.preventDefault();
 				e.stopPropagation();
-				document.getElementById('filter_select')?.addEventListener(
-					'change',
-					() => {
-						document.getElementById('select_set_err_msg')?.classList.add('d-none');
-					},
-					{ once: true }
-				);
+				show_errors(['select_set_err_msg'], [filter_select]);
 			} else if (filter === 'match_ids' && filter_text.value === '') {
 				e.preventDefault();
 				e.stopPropagation();
-				document.getElementById('filter_err_msg')?.classList.remove('d-none');
-				filter_text.classList.add('is-invalid');
-				filter_text.addEventListener(
-					'change',
-					() => {
-						document.getElementById('filter_err_msg')?.classList.add('d-none');
-						document.getElementById('filter_text')?.classList.remove('is-invalid');
-					},
-					{ once: true }
-				);
-			}
-		} else if (action === 'edit') {
-			const edit_select = document.getElementById('edit_select');
-			if (edit_select.value === 'selected' && !is_set_selected()) {
-				e.preventDefault();
-				e.stopPropagation();
-				edit_select.classList.add('is-invalid');
-				edit_select.addEventListener(
-					'change',
-					() => {
-						document.getElementById('select_set_err_msg')?.classList.add('d-none');
-						document.getElementById('edit_select')?.classList.remove('is-invalid');
-					},
-					{ once: true }
-				);
-			}
-		} else if (action === 'publish') {
-			const publish_select = document.getElementById('publish_filter_select');
-			if (publish_select.value === 'selected' && !is_set_selected()) {
-				e.preventDefault();
-				e.stopPropagation();
-				publish_select.classList.add('is-invalid');
-				publish_select.addEventListener(
-					'change',
-					() => {
-						document.getElementById('select_set_err_msg')?.classList.add('d-none');
-						document.getElementById('publish_filter_select')?.classList.remove('is-invalid');
-					},
-					{ once: true }
-				);
+				show_errors(['filter_err_msg'], [filter_select, filter_text]);
 			}
-		} else if (action === 'export') {
-			const export_select = document.getElementById('export_select');
-			if (export_select.value === 'selected' && !is_set_selected()) {
+		} else if (['edit', 'publish', 'export', 'score'].includes(action)) {
+			const action_select = document.getElementById(`${action}_select`);
+			if (action_select.value === 'selected' && !is_set_selected()) {
 				e.preventDefault();
 				e.stopPropagation();
-				export_select.classList.add('is-invalid');
-				export_select.addEventListener(
-					'change',
-					() => {
-						document.getElementById('select_set_err_msg')?.classList.add('d-none');
-						document.getElementById('export_select')?.classList.remove('is-invalid');
-					},
-					{ once: true }
-				);
+				show_errors(['select_set_err_msg'], [action_select]);
 			}
 		} else if (action === 'save_export') {
 			if (!is_set_selected()) {
 				e.preventDefault();
 				e.stopPropagation();
 			}
-		} else if (action === 'score') {
-			const score_select = document.getElementById('score_select');
-			if (score_select.value === 'selected' && !is_set_selected()) {
-				e.preventDefault();
-				e.stopPropagation();
-				score_select.classList.add('is-invalid');
-				score_select.addEventListener(
-					'change',
-					() => {
-						document.getElementById('select_set_err_msg')?.classList.add('d-none');
-						document.getElementById('score_select')?.classList.remove('is-invalid');
-					},
-					{ once: true }
-				);
-			}
 		} else if (action === 'import') {
 			const import_select = document.getElementById('import_source_select');
 			if (!import_select.value.endsWith('.def')) {
 				e.preventDefault();
 				e.stopPropagation();
-				document.getElementById('import_file_err_msg')?.classList.remove('d-none');
-				import_select.classList.add('is-invalid');
-				import_select.addEventListener(
-					'change',
-					() => {
-						document.getElementById('import_source_select')?.classList.remove('is-invalid');
-						document.getElementById('import_file_err_msg')?.classList.add('d-none');
-					},
-					{ once: true }
-				);
+				show_errors(['import_file_err_msg'], [import_select]);
 			}
 		} else if (action === 'create') {
 			const create_text = document.getElementById('create_text');
+			const create_select = document.getElementById('create_select');
 			if (create_text.value === '') {
 				e.preventDefault();
 				e.stopPropagation();
-				document.getElementById('create_file_err_msg')?.classList.remove('d-none');
-				create_text.classList.add('is-invalid');
-				create_text.addEventListener(
-					'change',
-					() => {
-						document.getElementById('create_file_err_msg')?.classList.add('d-none');
-						document.getElementById('create_text')?.classList.remove('is-invalid');
-					},
-					{ once: true }
-				);
-			} else if (document.getElementById('create_select')?.value == 'copy' && !is_set_selected()) {
+				show_errors(['create_file_err_msg'], [create_text]);
+			} else if (create_select?.value == 'copy' && !is_set_selected()) {
 				e.preventDefault();
 				e.stopPropagation();
+				show_errors(['select_set_err_msg'], [create_select]);
 			}
 		} else if (action === 'delete') {
 			const delete_confirm = document.getElementById('delete_select');
@@ -161,16 +100,7 @@
 			} else if (delete_confirm.value != 'yes') {
 				e.preventDefault();
 				e.stopPropagation();
-				document.getElementById('delete_confirm_err_msg')?.classList.remove('d-none');
-				delete_confirm.classList.add('is-invalid');
-				delete_confirm.addEventListener(
-					'change',
-					() => {
-						document.getElementById('delete_select')?.classList.remove('is-invalid');
-						document.getElementById('delete_confirm_err_msg')?.classList.add('d-none');
-					},
-					{ once: true }
-				);
+				show_errors(['delete_confirm_err_msg'], [delete_confirm]);
 			}
 		}
 	});
@@ -178,13 +108,10 @@
 	// Remove all error messages when changing tabs.
 	for (const tab of document.querySelectorAll('a[data-bs-toggle="tab"]')) {
 		tab.addEventListener('shown.bs.tab', () => {
-			const actionForm = document.getElementById('problemsetlist');
-			for (const err_msg of actionForm.querySelectorAll('div[id$=_err_msg]')) {
-				err_msg.classList.add('d-none');
-			}
-			for (const invalid of actionForm.querySelectorAll('.is-invalid')) {
-				invalid.classList.remove('is-invalid');
-			}
+			hide_errors(
+				[],
+				document.getElementById('problemsetlist')?.querySelectorAll('div[id$=_err_msg], .is-invalid')
+			)();
 		});
 	}
 
diff --git a/htdocs/js/UserList/userlist.js b/htdocs/js/UserList/userlist.js
index 338b9e6f8f..697298afff 100644
--- a/htdocs/js/UserList/userlist.js
+++ b/htdocs/js/UserList/userlist.js
@@ -26,21 +26,46 @@
 	}
 
 	// Action form validation.
+	const show_errors = (ids, elements) => {
+		for (const id of ids) elements.push(document.getElementById(id));
+		for (const element of elements) {
+			if (element?.id.endsWith('_err_msg')) {
+				element?.classList.remove('d-none');
+			} else {
+				element?.classList.add('is-invalid');
+				element?.addEventListener('change', hide_errors([], elements));
+			}
+		}
+	};
+
+	const hide_errors = (ids, elements) => {
+		return () => {
+			for (const id of ids) elements.push(document.getElementById(id));
+			for (const element of elements) {
+				if (element?.id.endsWith('_err_msg')) {
+					element?.classList.add('d-none');
+					if (element.id === 'select_user_err_msg')
+						document.getElementById('classlist-table')?.removeEventListener('change', hide_errors);
+				} else {
+					element?.classList.remove('is-invalid');
+					element?.removeEventListener('change', hide_errors);
+				}
+			}
+		};
+	};
+
 	const is_user_selected = () => {
 		for (const user of document.getElementsByName('selected_users')) {
 			if (user.checked) return true;
 		}
-		document.getElementById('select_user_err_msg')?.classList.remove('d-none');
-		document.getElementById('classlist-table')?.addEventListener(
-			'change',
-			() => {
-				document.getElementById('select_user_err_msg')?.classList.add('d-none');
-				for (const id of ['filter_select', 'edit_select', 'password_select', 'export_select_scope']) {
-					document.getElementById(id)?.classList.remove('is-invalid');
-				}
-			},
-			{ once: true }
-		);
+		const err_msg = document.getElementById('select_user_err_msg');
+		err_msg?.classList.remove('d-none');
+		document
+			.getElementById('classlist-table')
+			?.addEventListener(
+				'change',
+				hide_errors(['filter_select', 'edit_select', 'password_select', 'export_select_scope'], [err_msg])
+			);
 		return false;
 	};
 
@@ -53,101 +78,31 @@
 			if (filter === 'selected' && !is_user_selected()) {
 				e.preventDefault();
 				e.stopPropagation();
-				filter_select.classList.add('is-invalid');
-				filter_select.addEventListener(
-					'change',
-					() => {
-						document.getElementById('select_user_err_msg')?.classList.add('d-none');
-						document.getElementById('filter_select')?.classList.remove('is-invalid');
-					},
-					{ once: true }
-				);
+				show_errors(['select_user_err_msg'], [filter_select]);
 			} else if (filter === 'match_regex' && filter_text.value === '') {
 				e.preventDefault();
 				e.stopPropagation();
-				document.getElementById('filter_err_msg')?.classList.remove('d-none');
-				filter_text.classList.add('is-invalid');
-				filter_text.addEventListener(
-					'change',
-					() => {
-						document.getElementById('filter_text')?.classList.remove('is-invalid');
-						document.getElementById('filter_err_msg')?.classList.add('d-none');
-					},
-					{ once: true }
-				);
+				show_errors(['filter_err_msg'], [filter_select, filter_text]);
 			}
-		} else if (action === 'edit') {
-			const edit_select = document.getElementById('edit_select');
-			if (edit_select.value === 'selected' && !is_user_selected()) {
+		} else if (['edit', 'password'].includes(action)) {
+			const action_select = document.getElementById(`${action}_select`);
+			if (action_select.value === 'selected' && !is_user_selected()) {
 				e.preventDefault();
 				e.stopPropagation();
-				edit_select.classList.add('is-invalid');
-				edit_select.addEventListener(
-					'change',
-					() => {
-						document.getElementById('select_user_err_msg')?.classList.add('d-none');
-						document.getElementById('edit_select')?.classList.remove('is-invalid');
-					},
-					{ once: true }
-				);
-			}
-		} else if (action === 'password') {
-			const password_select = document.getElementById('password_select');
-			if (password_select.value === 'selected' && !is_user_selected()) {
-				e.preventDefault();
-				e.stopPropagation();
-				password_select.classList.add('is-invalid');
-				password_select.addEventListener(
-					'change',
-					() => {
-						document.getElementById('select_user_err_msg')?.classList.add('d-none');
-						document.getElementById('password_select')?.classList.remove('is-invalid');
-					},
-					{ once: true }
-				);
+				show_errors(['select_user_err_msg'], [action_select]);
 			}
 		} else if (action == 'export') {
 			const export_filename = document.getElementById('export_filename');
 			const export_select = document.getElementById('export_select_scope');
+			const export_select_target = document.getElementById('export_select_target');
 			if (export_select.value === 'selected' && !is_user_selected()) {
 				e.preventDefault();
 				e.stopPropagation();
-				export_select.classList.add('is-invalid');
-				export_select.addEventListener(
-					'change',
-					() => {
-						document.getElementById('select_user_err_msg')?.classList.add('d-none');
-						document.getElementById('export_select_scope')?.classList.remove('is-invalid');
-					},
-					{ once: true }
-				);
-			} else if (
-				document.getElementById('export_select_target')?.value === 'new' &&
-				export_filename.value === ''
-			) {
+				show_errors(['select_user_err_msg'], [export_select]);
+			} else if (export_select_target?.value === 'new' && export_filename.value === '') {
 				e.preventDefault();
 				e.stopPropagation();
-				document.getElementById('export_file_err_msg')?.classList.remove('d-none');
-				document.getElementById('export_select_target')?.classList.add('is-invalid');
-				export_filename.classList.add('is-invalid');
-				export_filename.addEventListener(
-					'change',
-					() => {
-						document.getElementById('export_filename')?.classList.remove('is-invalid');
-						document.getElementById('export_select_target')?.classList.remove('is-invalid');
-						document.getElementById('export_file_err_msg')?.classList.add('d-none');
-					},
-					{ once: true }
-				);
-				document.getElementById('export_select_target')?.addEventListener(
-					'change',
-					() => {
-						document.getElementById('export_filename')?.classList.remove('is-invalid');
-						document.getElementById('export_select_target')?.classList.remove('is-invalid');
-						document.getElementById('export_file_err_msg')?.classList.add('d-none');
-					},
-					{ once: true }
-				);
+				show_errors(['export_file_err_msg'], [export_filename, export_select_target]);
 			}
 		} else if (action === 'delete') {
 			const delete_confirm = document.getElementById('delete_select');
@@ -157,16 +112,7 @@
 			} else if (delete_confirm.value != 'yes') {
 				e.preventDefault();
 				e.stopPropagation();
-				document.getElementById('delete_confirm_err_msg')?.classList.remove('d-none');
-				delete_confirm.classList.add('is-invalid');
-				delete_confirm.addEventListener(
-					'change',
-					() => {
-						document.getElementById('delete_select')?.classList.remove('is-invalid');
-						document.getElementById('delete_confirm_err_msg')?.classList.add('d-none');
-					},
-					{ once: true }
-				);
+				show_errors(['delete_confirm_err_msg'], [delete_confirm]);
 			}
 		}
 	});
@@ -174,13 +120,10 @@
 	// Remove all error messages when changing tabs.
 	for (const tab of document.querySelectorAll('a[data-bs-toggle="tab"]')) {
 		tab.addEventListener('shown.bs.tab', () => {
-			const actionForm = document.getElementById('user-list-form');
-			for (const err_msg of actionForm.querySelectorAll('div[id$=_err_msg]')) {
-				err_msg.classList.add('d-none');
-			}
-			for (const invalid of actionForm.querySelectorAll('.is-invalid')) {
-				invalid.classList.remove('is-invalid');
-			}
+			hide_errors(
+				[],
+				document.getElementById('user-list-form')?.querySelectorAll('div[id$=_err_msg], .is-invalid')
+			)();
 		});
 	}
 })();
diff --git a/templates/ContentGenerator/Instructor/ProblemSetList/publish_form.html.ep b/templates/ContentGenerator/Instructor/ProblemSetList/publish_form.html.ep
index fe9b1f0c33..7314cd96a9 100644
--- a/templates/ContentGenerator/Instructor/ProblemSetList/publish_form.html.ep
+++ b/templates/ContentGenerator/Instructor/ProblemSetList/publish_form.html.ep
@@ -1,13 +1,13 @@
 <div>
 	<div class="row mb-2">
-		<%= label_for publish_filter_select => maketext('Choose which sets to be affected') . ':',
+		<%= label_for publish_select => maketext('Choose which sets to be affected') . ':',
 			class => 'col-form-label col-form-label-sm col-sm-auto' =%>
 		<div class="col-auto">
 			<%= select_field 'action.publish.scope' => [
 					[ maketext('all course sets') => 'all' ],
 					[ maketext('selected sets')   => 'selected', selected => undef ]
 				],
-				id => 'publish_filter_select', class => 'form-select form-select-sm' =%>
+				id => 'publish_select', class => 'form-select form-select-sm' =%>
 		</div>
 	</div>
 	<div class="row mb-2">