Question

我刚刚开始学习javascript，我想知道如何在完成向数据库提交表单后调用PHP中的javascript函数。我的javascript代码基本上是一个警告框，表示您的帐户已创建。任何回应都会有所帮助。这是我要插入函数的PHP代码部分（其他一切无关紧要）和javascript代码插入，如果您需要其他任何请告诉我。非常感谢！

PHP：

<?php

class Registration
{
    **FORM VALIDATION AND SUBMISSION NOT INCLUDED**

                    if ($query_check_user_name->num_rows == 1) 
                    {
                        $this->errors[] = "Sorry, that user name is already taken. Please choose another one.";
                    } 
                    else 
                    {
                        // write new users data into database
                        $query_new_user_insert = $this->db_connection->query("INSERT INTO users (user_name, user_password_hash, user_email) VALUES('" . $this->user_name . "', '" . $this->user_password_hash . "', '" . $this->user_email . "');");

                        if ($query_new_user_insert) 
                        {
                            $this->registration_successful = true;
                            $this->messages[] = "Registration successful! Please go back to the login page and login in with your new username and password.";
                            echo "<script type='text/javascript'>myFunction()</script";
                        } 
                        else 
                        {
                            $this->errors[] = "Sorry, your registration failed. Please go back and try again.";
                        }
                    }
                } 
                else 
                {
                    $this->errors[] = "Sorry, no database connection.";
                }
            }
        } 
        else 
        {
            $this->errors[] = "An unknown error occurred.";
        }
    }
}
?>

使用Javascript：

<script>
    function myFunction()
    {
        var r = confirm("Registration Successful!\nYou will now be redirected to the login page");
        if(r == true)
        {
           location.assign("http://yhsaa.org/members/index.php");
        }
    }   
</script>

Answer 1

试试这个：

echo "<script type='text/javascript'>window.onload = function()
{
    myFunction();
}
</script>";

正在发生的事情是，此代码在名为onload的窗口对象上创建事件。当您的html加载完成后，将触发此事件。然后它将调用您的函数myFunction()。此行为将确保您的函数在之前被声明为，因此它避免了您的函数未声明的异常。

就像改变这一点：

myFunction(); // At this time JS doesn't know that you have an function called myFunction() function myFunction() {};

到此：

function myFunction() {}; myFunction(); // At this time JS already know your function myFunction() and it will call it.

Answer 2

您的脚本包含错误，您没有正确关闭脚本标记！

如何在PHP中提交表单后调用Javascript函数

2 个答案: