Question

我已多次尝试下拉列表验证，我的代码是用PHP和HTML编写的，验证部分不起作用，我在stackoverflow中引用了一些类似于我的类似案例的解决方案。

声明变量

$call_department = $db->escape((int)$_POST['call_department']); //where i declare this variable

HTML文件

<tr><td>Department</td><td><select name='call_department'>
<option></option>
<?php $call_dept = $db->get_results("select type_id,type_name from site_types where type=1 order by type_name;");
foreach ($call_dept as $dept )
{?>
<option value='<?php echo $dept->type_id;?>'><?php echo $dept->type_name; required?></option>
<?php } ?>
</select></td></tr>

验证部分：

<?php 
if(isset($_REQUEST['call_department']) && $_REQUEST['call_department'] == '0') { 
echo 'Please select a department.'; 
} 
?>

Answer 1

1）像这样设置第一个选项Required

<select name='call_department' required>

2）<select name='call_department' required> <option value="0">select</option> <?php $call_dept = $db->get_results("select type_id,type_name from site_types where type=1 order by type_name;"); foreach ($call_dept as $dept ) { ?> <option value='<?php echo $dept->type_id;?>'><?php echo $dept->type_name; ?></option> <?php } ?> </select>属性应设置为选择标记而不是选项标记@Component("shiroSecurityConfig") public class ShiroSecurityConfig { @Autowired (required = true) private TestService testService; @Bean(name = "shiroFilter") public ShiroFilterFactoryBean shiroFilter() { testService.getrecords(); //this line got null pointer exception. } }

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下拉列表验证无效

1 个答案: