Question

我正在使用下面的代码，但在用户跳过必填字段时需要错误消息。有人可以帮忙吗？因此，如果用户忘记填写所需的输入字段＆＃34;名字＆＃34;，则在字段上方显示错误消息＆＃34;名字是必填字段＆＃34;。

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)

    //1
    guard let appDelegate =
        UIApplication.shared.delegate as? AppDelegate else {
            return
    }

    let managedContext =
        appDelegate.persistentContainer.viewContext

    //2
    let fetchRequest =
        NSFetchRequest<NSManagedObject>(entityName: "Company")

    //3
    do {
        companies = try managedContext.fetch(fetchRequest)
    } catch let error as NSError {
        print("Could not fetch. \(error), \(error.userInfo)")
    }

}

和

   <form id="comment_form" action="form.php" method="post">
      <div class="compulsoryfield">
      <input class="inputfield-radio" type="radio" name="gender" value="Mr" required><label class="label-radio">Mr.</label>
  <input class="inputfield-radio" type="radio" name="gender" value="Ms"><label class="label-radio">Ms.</label>
  <span class="requiredmark-radio">*</span>
  </div>
       <div class="compulsoryfield"><span class="requiredmark">*</span>
       <input class="inputfield3" type="firstname" placeholder="first name" required>
     </div>
     <div class="compulsoryfield"><span class="requiredmark">*</span>
       <input class="inputfield1" type="lastname" placeholder="last name" required>
     </div>
      <input class="inputfield2" type="companyname" placeholder="company name (if applicable)">
      <input class="inputfield2" type="customernumber" placeholder="customer number (on invoice if available)" >
      <br><br>
      <div class="compulsoryfield"><span class="requiredmark">*</span>
      <input class="inputfield3" type="email" placeholder="email address" required>
      </div>
      <div class="compulsoryfield"><span class="requiredmark">*</span>
       <input class="inputfield1" type="emailagain" placeholder="re-enter email address (to confirm)" required>
       </div>
       <input class="inputfield2" type="telephonenumber" placeholder="telephone number (country code included)">
       <br><br>
       <div class="compulsoryfield"><span class="requiredmark">*</span>
       <input class="inputfield3" type="subject" placeholder="subject of message" required>
       </div>
       <div class="compulsoryfield"><span class="requiredmark">*</span>
      <textarea id="textareafieldid" class="textareafield" name="message" placeholder="add your message here" rows="8" cols="39" required></textarea></div><br><br>
      <p id="recaptcha-header">before sending, please show us you're real:</p>

<div><span class="requiredmark">*</span><div id="g-recaptcha-outer" class="compulsoryfield2">
      <div class="g-recaptcha" data-sitekey="mySitekey"></div></div><br><br>
      <input id="button-type1" type="submit" name="submit" value="SEND">

    </form>

Answer 1

我建议你尝试js插件，如： http://parsleyjs.org/ 要么 http://www.formvalidator.net/

你会看到，第一个对我来说是最好的，第二个对我很简单。

使用秒，你只需要在你的领域添加属性规则，如：
数据验证=＆＃34;需＆＃34;

通过此示例，您可以需要一个字段。

Answer 2

将表单的目标发送到表单所在的同一页面。在将任何html代码发送到客户端之前的页面顶部，进行表单处理。

$problemstring = "";
$firstname = "";
if(isset($_POST['submit'])){
    if(!isset($_POST['firstname'])){$problemstring = "Error in firstname"}
    //repeat for all fields
}
if(strlen($problemString)==0) {
    //Do database actions here

    //The Line below redirects to another page if form good
    if(strlen($problemString)==0) die(header('Location: index.php'));
}

此代码检查表单中是否有空白数据，如果运行数据库操作没有问题。如果出现问题，页面的其余部分将加载。将代码放在您希望显示错误消息的位置下方。

<?php
    if(strlen($problemString)>0) {
        echo '<table><tr>';
        echo '<td colspan="3">';
        echo '<font color="#FF0000"><strong>There was a problem with your form</strong><br>';
        echo $problemString;
        echo '</font></td>';
        echo '</tr>';
        echo '<tr><td colspan="3" height="16"></td></tr></table>';
    }
?>

在您的表单中执行以下操作：

<input class="inputfield3" type="firstname" placeholder="first name" value="<?php echo $firstname; ?>" required>

这将使用在提交之前输入到表单中的内容填充该字段，如果这是空字段则为空白。如果第一次加载页面，则该值将为空（或者您设置的任何内容）。

我已经在我的网站上使用过它，效果很好。

联系表单的错误消息

2 个答案: