我是php的新手，我希望将span显示在输入字段中，并在提交表单后讨厌这个*必填字段，并且*继续显示。
<html>
<head>
<style>
.error {color: #FF0000;}
</style>
</head>
<body>
<?php
<h2>PHP Form Validation Example</h2>
<p><span class="error">* required field</span></p>
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
Name: <input type="text" name="name" value="<?php echo $name;?>">
<span class="error">* <?php echo $nameErr;?> </span>
<br><br>
E-mail: <input type="text" name="email" value="<?php echo $email;?>">
<span class="error">* <?php echo $emailErr;?></span>
<br><br>
Website: <input type="text" name="website" value="<?php echo $website;?>">
<span class="error"><?php echo $websiteErr;?></span>
<br><br>
Comment: <textarea name="comment" rows="5" cols="40"><?php echo $comment;?></textarea>
<br><br>
Gender:
<input type="radio" name="gender" value="female" <?php if (isset($gender) && $gender==="female") {echo "checked";}?>>Female
<input type="radio" name="gender" value="male" <?php if (isset($gender) && $gender==="male") {echo "checked";}?>>Male
<input type="radio" name="gender" value="other" <?php if (isset($gender) && $gender==="other") {echo "checked";}?>>Other
<span class="error">* <?php echo $genderErr;?></span>
<br><br>
<input type="submit" name="submit" value="Submit">
</form>
</body>
</html>
最佳答案
您不能将其放置在输入中。
您可以在容器内使用绝对定位将其放置在输入的顶部：
.input-container {
position: relative;
display: inline-block;
}
.input-container .error {
font-size: 14px;
color: red;
position: absolute;
right: 5px;
top: 5px;
font-style: italic;
}
label {
display: inline-block;
margin-right: 15px;
}
input[type="text"] {
width: 300px;
height: 40px;
padding: 5px 15px;
}<form method="post">
<div class="field-container">
<label for="name">Name *</label>
<div class="input-container">
<input id="name" type="text" name="name" value="" />
<span class="error">* This field should not be empty</span>
</div>
</div>
<!-- repeat for other fields -->
</form>如果只想在出现错误时显示错误：
<?php if (isset($_POST['name']) && strlen($nameErr) > 0): ?>
<span class="error"><?php echo $nameErr; ?></span>
<?php endif; ?>
在这里，我假设变量没有错误时为空字符串。