Question

似乎下面发布的代码中的第二个警告不会出现; alert("The user is succesfully been added!");不会显示。我的每个文本框都有一个脚本，用户名，名字，姓氏和密码。

首先，我尝试为save btn和textbox单独发出警报;场景是当我单击带有空字段的保存按钮时，它将显示添加用户成功的警报。然后它将显示我需要填写文本框的另一个警报。所以我在想，如果我检查空字段，成功警报就不会显示，只会在我输入正确的内容时显示。但发生的事情是，它不会显示我期望显示的警报。

整个添加用户表单的代码：

<div id="add_user" class="modal hide fade" tabindex="-1" role="dialog" aria-labelledby="myModalLabel"
     aria-hidden="true">
    <div class="modal-body">
        <div class="alert alert-info"><strong>Add User</strong></div>
        <form class="form-horizontal" method="post">
            <div class="control-group">
                <label class="control-label" for="inputEmail">Username</label>
                <div class="controls">
                    <input type="text" id="inputEmail" name="username" placeholder="Username" required>
                </div>
            </div>
            <div class="control-group">
                <label class="control-label" for="inputPassword">Password</label>
                <div class="controls">
                    <input type="password" name="password" id="inputPassword" placeholder="Password" required>
                </div>
            </div>
            <div class="control-group">
                <label class="control-label" for="inputEmail">Firstname</label>
                <div class="controls">
                    <input type="text" id="inputEmail" name="firstname" placeholder="Firstname" pattern="[A-Za-z].{1,}"
                           required>
                </div>
            </div>
            <div class="control-group">
                <label class="control-label" for="inputEmail">Lastname</label>
                <div class="controls">
                    <input type="text" id="inputEmail" name="lastname" placeholder="Lastname" pattern="[A-Za-z].{1,}"
                           required>
                </div>
            </div>
            <div class="control-group">
                <div class="controls">
                    <button name="submit" onClick="return saveuservalidation()" class="btn btn-success"><i
                            class="icon-save icon-large"></i>&nbsp;Save
                    </button>
                </div>
            </div>
        </form>
    </div>
    <div class="modal-footer">
        <button class="btn" data-dismiss="modal" aria-hidden="true"><i class="icon-remove icon-large"></i>&nbsp;Close
        </button>
    </div>
</div>
<script>
    function saveuservalidation() {
        if (firstname == "" || lastname == "" || username == "" || password == "") {
            return false;
        } else {
            return true;
            alert("The user is succesfully been added!");
        }
    }
</script>
<?php
if (isset($_POST['submit'])){
$username=$_POST['username'];
$password=$_POST['password'];
$firstname=$_POST['firstname'];
$lastname=$_POST['lastname'];

mysql_query("insert into users (username,password,firstname,lastname) values('$username','$password','$firstname','$lastname')")or die(mysql_error());
}
?>

javascript :(这是正确的方式吗？）

<script>
    function saveuservalidation() {
        if (firstname == "" || lastname == "" || username == "" || password == "") {
            return false;
        } else {
            return true;
            alert("The user is succesfully been added!");
        }
    }
</script>

OR

<script>
    function saveuservalidation() {
        if (firstname == "" || lastname == "" || username == "" || password == "") {
            return false;
        } else {
            alert("The user is succesfully been added!");
            return true;
        }
    }
</script>

它不会显示任何警报。

Answer 1

只要你return，函数就会返回，之后的所有内容都不会被执行（无法访问）。将其更改为

else{
   alert("The user is succesfully been added!"); 
   return true;
}

并显示警告。

请向我解释为什么没有显示第二个警报

1 个答案: