我在联系表单中验证名称时遇到了问题。如果名称字段留空，则表单应生成错误消息，例如＆＃34;请输入您的姓名＆＃34;。相反，没有错误消息，并且允许发送电子邮件。这是我的代码：
<form id="ajax-contact-form" class="form-horizontal" action="javascript:alert('success!');">
<div class="row">
<div class="span4">
<div class="control-group">
<label class="control-label" for="inputName">Your full name:</label>
<div class="controls">
<input class="span4" type="text" id="inputName" name="name" value="Your full name:" onBlur="if(this.value=='') this.value='Your full name:'" onFocus="if(this.value =='Your full name:' ) this.value=''">
</div>
</div>
</div>
<div class="span4">
<div class="control-group">
<label class="control-label" for="inputEmail">Your email:</label>
<div class="controls">
<input class="span4" type="text" id="inputEmail" name="email" value="Your email:" onBlur="if(this.value=='') this.value='Your email:'" onFocus="if(this.value =='Your email:' ) this.value=''">
</div>
</div>
</div>
<div class="span4">
<div class="control-group">
<label class="control-label" for="inputPhone">Phone number:</label>
<div class="controls">
<input class="span4" type="text" id="inputPhone" name="phone" value="Phone number:" onBlur="if(this.value=='') this.value='Phone number:'" onFocus="if(this.value =='Phone number:' ) this.value=''">
</div>
</div>
</div>
<div class="span4">
<div class="control-group">
<label class="control-label" for="inputDrums">Do you have a drum set?</label>
<div class="controls">
<select input class="" type="text" id="inputDrums" name="drums">
<option>Do you have a drum set?</option>
<option>Yes</option>
<option>No</option>
</select>
</div>
</div>
</div>
<div class="span4">
<div class="control-group">
<label class="control-label" for="inputLevel">What level is the student?</label>
<div class="controls">
<select input class="span4" type="text" id="inputLevel" name="level">
<option>What level is the student?</option>
<option>Beginner</option>
<option>Intermediate</option>
<option>Advanced</option>
</select>
</div>
</div>
</div>
<div class="span4">
<div class="control-group">
<label class="control-label" for="inputCity">What city do you live in?</label>
<div class="controls">
<select input class="span4" type="text" id="inputCity" name="city">
<option>What city do you live in?</option>
<option>Boulder</option>
<option>Erie</option>
<option>Gunbarrel</option>
<option>Lafayette</option>
<option>Longmont</option>
<option>Louisville</option>
<option>Niwot</option>
<option>Other</option>
</select>
</div>
</div>
</div>
</div>
<div class="row">
<div class="span12">
<div class="control-group">
<label class="control-label" for="inputMessage">Message:</label>
<div class="controls">
<textarea class="span12" id="inputMessage" name="content" onBlur="if(this.value=='') this.value='Message:'"
onFocus="if(this.value =='Message:' ) this.value=''">Message:</textarea>
</div>
</div>
</div>
</div>
<div class="row">
<div class="span12">
<div class="control-group captcha">
<label class="control-label" for="inputCaptcha">Enter captcha numbers here:</label>
<div class="controls">
<input class="" type="text" id="inputCaptcha" name="captcha" value="Enter captcha numbers here:" onBlur="if(this.value=='') this.value='Enter captcha numbers here:'" onFocus="if(this.value =='Enter captcha numbers here:' ) this.value=''">
<img src="captcha/captcha.php">
<img src="images/trans.png" style="width: 5px; height: 5px">
<INPUT TYPE="button" onClick="history.go(0)" VALUE="Refresh captcha" style="width: 120px; height: 42px">
</div>
</div>
</div>
</div>
<button type="submit" class="submit">Send</button>
</form>
**Contact.php**
<?php
/*
Credits: Bit Repository
URL: http://www.bitrepository.com/
*/
include 'contact_config.php';
session_start();
error_reporting (E_ALL ^ E_NOTICE);
$post = (!empty($_POST)) ? true : false;
if($post)
{
include 'functions.php';
$name = stripslashes($_POST['name']);
$email = trim($_POST['email']);
$phone = stripslashes($_POST['phone']);
$drums = stripslashes($_POST['drums']);
$level = stripslashes($_POST['level']);
$city = stripslashes($_POST['city']);
$subject = "Website Inquiry";
$message = "
Name: ".$_POST['name']
."
E-mail Address: ".$_POST['email']
."
Phone: ".$_POST['phone']
."
Drums: ".$_POST['drums']
."
Level: ".$_POST['level']
."
City: ".$_POST['city']
."
Message: ".$_POST['content'];
$error = '';
// Check name
if(!$name)
{
$error .= 'Please enter your name.<br />';
}
// Check email
if(!$email)
{
$error .= 'Please enter an e-mail address.<br />';
}
if($email && !ValidateEmail($email))
{
$error .= 'Please enter a valid e-mail address.<br />';
}
if(isset($_SESSION['captcha_keystring']) && strtolower($_SESSION['captcha_keystring']) != strtolower($_POST['captcha']))
{
$error .= "Incorrect captcha.<br />";
}
if(!$error)
{
$mail = mail(WEBMASTER_EMAIL, $subject, $message,
"From: ".$name." <".$email.">\r\n"
."Reply-To: ".$email."\r\n"
."X-Mailer: PHP/" . phpversion());
if($mail)
{
echo 'OK';
}
}
else
{
echo '<div class="notification_error">'.$error.'</div>';
}
}
?>
**functions.php**
<?php
function ValidateEmail($email)
{
$regex = '/([a-z0-9_.-]+)'. # name
'@'. # at
'([a-z0-9.-]+){2,255}'. # domain & possibly subdomains
'.'. # period
'([a-z]+){2,10}/i'; # domain extension
if($email == '') {
return false;
}
else {
$eregi = preg_replace($regex, '', $email);
}
return empty($eregi) ? true : false;
}
?>
答案 0 :(得分：2)
您的Car可能实际上不是空的，可能是$_POST['name']。取代
' '与
if(!$name){//...
您也可以修剪字符串。 e.g。
if(empty($name)){//...
答案 1 :(得分：0)
使用 isset 验证参数是否已发送
if(!isset($_POST['name']))
{
$error .= 'Please enter your name.<br />';
}
尝试在条件之前打印$ error参数，看看输出是什么。
关于电子邮件变体，您可以在过滤器中使用PHP构建：
if (filter_var($email_b, FILTER_VALIDATE_EMAIL)) {
echo "This ($email_b) email address is considered valid.";
}
答案 2 :(得分：0)
在我的测试中，我发现空字符串总是评估为false，所以如果$_POST['name']变量是空字符串，你的代码应该可以工作。
然后，您可能会在没有意识到的情况下从表单中接收空格（例如空格或换行符）。在这种情况下，您可以像这样过滤$_POST变量：
$filtered = array_map("stripslashes", array_filter(array_map("trim", $_POST)));
完成此操作后，如果$filtered['name']为空或仅为空格，则不会设置$_POST['name']。可以使用isset或array_key_exists检查此内容。
答案 3 :(得分：0)
将值更改为占位符
原始代码
<input class="span4" id="inputName" name="name" value="Your full name:" onblur="if(this.value=='') this.value='Your full name:'" onfocus="if(this.value =='Your full name:' ) this.value=''" type="text">
要
更改了代码
<input class="span4" id="inputName" name="name" placeholder="your full name" type="text">
占位符将出现在输入字段中。但是当您向字段添加内容时，占位符将消失。此外，当输入字段中的明文（使输入字段为空）并且您将焦点放在其上时，输入字段将保留其占位符值。
对所有输入字段执行此操作，例如电子邮件。
但是如果您仍想保留onfocus和onblur事件，请在提交时调用此函数（虽然我不推荐这样，因为只有在客户端启用了javascript时它才会起作用。）
function()
{
var name = document.getElementById('inputName');
if(name.value === "Your full name:" || name.value === "")
{
return false;
}
}