我使用ajax创建了一个简单的php注册表单，我的代码中几乎没有问题，当我点击注册按钮而没有填写任何字段 然后它应该抛出错误消息，说名称是必需的用户名是这样需要的，而不是每个字段的抛出错误消息。即， 如果我只是点击注册按钮而不提交任何字段，那么我首先只抛出错误信息说输入名称。我的要求是为所有字段一次性抛出错误消息
的index.php
<!DOCTYPE HTML>
<html>
<head>
<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
<script src="script.js"></script>
<style>
.error {
color:red;
}
.button {
background-color: #4CAF50;
border: none;
color: white;
padding: 10px 25px;
text-align: center;
text-decoration: none;
display: inline-block;
font-size: 16px;
margin: 4px 2px;
cursor: pointer;
}
.div1 {
margin-top: -19px;
margin-bottom: -25px;
margin-left: -19px;
}
.copy {
border-radius: 4px;
padding: 6px 20px;
border-style: ridge;
}
.copy1{
border-radius: 4px;
padding: 6px 28px;
border-style: ridge;
}
.copy2{
border-radius: 4px;
padding: 4px 2px;
}
</style>
</head>
<body style="background-color:#1affff">
<div style="padding-left: 250px; padding-top:50px" class="div1">
<h2 style="color:#009999">Registration Form :</h2>
<p><span class="error">All fields are required </span></p>
<form action="" method="post" enctype="multipart/form-data">
<span style="color:#0099ff">Name: </span>
<input type="text" name="name" class= "name copy" style="margin-left: 52px" value ="">
<span class="namee error"> </span>
<br><br>
<span style="color:#0099ff"> E-mail: </span>
<input type="text" name="email" class= "email copy" style="margin-left: 48px" value ="">
<span class="emaile error"></span>
<br><br>
<span style="color:#0099ff"> Username: </span>
<input type="text" name="username" class= "username copy" style="margin-left:26px" value ="">
<span class="usernamee error"></span>
<br><br>
<span style="color:#0099ff"> Password: </span>
<input type="password" name="password" class= "password copy" style="margin-left:30px">
<span class="passworde error"> </span>
<br><br>
<span style="color:#0099ff"> Age : </span>
<input type="number" name="age" class= "age copy" style="margin-left:62px" value ="">
<span class="agee error"> </span>
<br><br>
<span style="color:#0099ff"> Date Of Birth : </span>
<input type="date" name="date_of_birth" class= "date_of_birth copy" style="margin-left:14px" value ="">
<span class="date_of_birthe error"> </span>
<br><br>
<span style="color:#0099ff"> Department : </span>
<select name="department" class= "department copy" style="margin-left:14px" value ="">
<option disabled selected value> -- select an option -- </option>
<option value="EE">Electrical & Electronics</option>
<option value="EC">Electronics & Communication</option>
<option value="ME">Mechanical</option>
<option value="CS">Computer Science</option>
<option value="CV">Civil</option>
<option value="IS">Information Science</option>
</select>
<span class="departmente error"> </span>
<br><br>
<input type="button" class="submit" name="submit" value="Register">
</form>
</div>
</body>
<script>
$(document).ready(function(){
$(".submit").click(function(){
var name = $(".name").val();
var email = $(".email").val();
var username = $(".username").val();
var password = $(".password").val();
var age = $(".age").val();
var date_of_birth = $(".date_of_birth").val();
var department = $(".department").val();
if(name==''){$('.namee').text('Enter name'); return false}
if(email==''){$('.emaile').text('Enter email'); return false}
if(username==''){$('.usernamee').text('Enter username'); return false}
if(password==''){$('.passworde').text('Enter password'); return false}
if(age==''){$('.agee').text('Enter age'); return false}
if(date_of_birth==''){$('.date_of_birthe').text('Enter date_of_birth'); return false}
if(department==''){$('.departmente').text('Enter department'); return false}
// Returns successful data submission message when the entered information is stored in database.
var dataString = 'name='+ name + '&email='+ email + '&username='+ username + '&password='+ password + '&age='+ age + '&date_of_birth='+ date_of_birth + '&department='+ department;
// AJAX Code To Submit Form.
$.ajax({
type: "POST",
url: "gethint.php",
data: dataString,
cache: false,
success: function(result){
alert(result);
}
});
});
});
</script>
</html>
gethint.php
<?php
$mysqli = mysqli_connect("localhost","root","","ajax");
$username =$_POST["username"];
$password=$_POST["password"];
$hashed_password = password_hash($password, PASSWORD_DEFAULT);
$email=$_POST["email"];
$name=$_POST["name"];
$age=$_POST["age"];
$date_of_birth=$_POST["date_of_birth"];
$department=$_POST["department"];
$check="SELECT * FROM users WHERE username = '$_POST[username]'";
$rs = mysqli_query($mysqli,$check);
$da = mysqli_fetch_array($rs, MYSQLI_NUM);
if($da[0] > 0) {
echo "Username Already in Exists<br/>";
}
else
{
$sql = "INSERT INTO users(`userid`,`username`, `password`, `email` , `name` , `age` , `date_of_birth` , `department`)
VALUES ('','".$username."', '".$hashed_password."', '".$email."' , '".$name."' , '".$age."' , '".$date_of_birth."' , '".$department."')";
if (mysqli_query($mysqli, $sql)) {
echo "Registered successfully";
} else {
echo "Error: " . $sql . "<br>" . mysqli_error($mysqli);
}
mysqli_close($mysqli);
}
?>
答案 0 :(得分：0)
<?php
//You should concatenate all error in one variable and print it error message containing div.
$mysqli = mysqli_connect("localhost","root","","ajax");
$err="";
$username =$_POST["username"];
if($username==""){
$err.="User name should not empty<br/>";
}
$password=$_POST["password"];
if($password==""){
$err.="Password should not empty<br/>";
}
$hashed_password = password_hash($password, PASSWORD_DEFAULT);
$email=$_POST["email"];
$name=$_POST["name"];
$age=$_POST["age"];
$date_of_birth=$_POST["date_of_birth"];
$department=$_POST["department"];
$check="SELECT * FROM users WHERE username = '$_POST[username]'";
$rs = mysqli_query($mysqli,$check);
$da = mysqli_fetch_array($rs, MYSQLI_NUM);
if($da[0] > 0) {
$err.="Username Already in Exists<br/>";
}
else
{
$sql = "INSERT INTO users(`userid`,`username`, `password`, `email` , `name` , `age` , `date_of_birth` , `department`)
VALUES ('','".$username."', '".$hashed_password."', '".$email."' , '".$name."' , '".$age."' , '".$date_of_birth."' , '".$department."')";
if (mysqli_query($mysqli, $sql)) {
echo "Registered successfully";
} else {
$err.="Error: " . $sql . "<br>" . mysqli_error($mysqli);
}
mysqli_close($mysqli);
}
if($err!=""){
echo $err;
}
?>