AJAX PHP条件逻辑无法正确评估 [英] AJAX PHP Conditional Logic not evaluating correctly

问题描述

由于某种原因，我来自PHP的ajax.responseTest在下面的javascript条件代码中无法正确评估。 ajax.responseTest返回为 signup_success（我用一个警告框对其进行了检查，它肯定会正确返回），但是我的JS代码中的条件将无法正确评估。

For some reason my ajax.responseTest coming from my PHP will not evaluate correctly in the javascript conditional code I have below. The ajax.responseTest is coming back as "signup_success" (I checked it with an alert box and it is definitely coming back correctly), but the conditional in my JS code will not evaluate correctly.

这是JavaScript：

Here is the javascript:

else {
    _("signupbtn").style.display = "none";
    status.innerHTML = 'please wait ...';
    var ajax = ajaxObj("POST", "signup.php");
    ajax.onreadystatechange = function() {
        if(ajaxReturn(ajax) == true) {
            if(ajax.responseText != "signup_success"){
                status.innerHTML = ajax.responseText;
                _("signupbtn").style.display = "block";
            } else {
                _("sign").innerHTML = ajax.responseText;
                window.scrollTo(0,0);
                _("signupform").innerHTML = "OK "+u+", check your email inbox and junk mail box at <strong>"+e+"</strong> in a moment to complete the sign up process by activating your account. You will not be able to do anything on the site until you successfully activate your account.";
            }
        }
    }
ajax.send("u="+u+"&e="+e+"&p="+p1+"&g="+g);
}

如果我在 ajax.responseText！= signup_success中更改逻辑运算符到 ==，else块将运行，因此在条件逻辑之前没有其他问题，我已经对其进行了测试，并且PHP（以下）肯定会返回 signup_success。您认为问题出在 if语句中？

If I change the logical operator in "ajax.responseText != "signup_success" " to "==" the else block will run, so there's not some other problem prior to the conditional logic, and I have tested it and the PHP (below) is DEFINITELY returning "signup_success". What do you think the problem could be in that "if" statement?

以下是PHP供参考：

    <?php
// Ajax calls this REGISTRATION code to execute
if(isset($_POST["u"])){
    // CONNECT TO THE DATABASE
    include_once("php_includes/db_conx.php");
    // GATHER THE POSTED DATA INTO LOCAL VARIABLES
    $u = preg_replace('#[^a-z0-9]#i', '', $_POST['u']);
    $e = mysqli_real_escape_string($db_conx, $_POST['e']);
    $p = $_POST['p'];
    $g = preg_replace('#[^a-z]#', '', $_POST['g']);
    // GET USER IP ADDRESS
    $ip = preg_replace('#[^0-9.]#', '', getenv('REMOTE_ADDR'));
    // DUPLICATE DATA CHECKS FOR USERNAME AND EMAIL
    $sql = "SELECT id FROM users WHERE username='$u' LIMIT 1";
    $query = mysqli_query($db_conx, $sql); 
    $u_check = mysqli_num_rows($query);
    // -------------------------------------------
    $sql = "SELECT id FROM users WHERE email='$e' LIMIT 1";
    $query = mysqli_query($db_conx, $sql); 
    $e_check = mysqli_num_rows($query);
    // FORM DATA ERROR HANDLING
    if($u == "" || $e == "" || $p == "" || $g == ""){
        echo "The form submission is missing values.";
        exit();
    } else if ($u_check > 0){ 
        echo "The username you entered is alreay taken";
        exit();
    } else if ($e_check > 0){ 
        echo "That email address is already in use in the system";
        exit();
    } else if (strlen($u) < 3 || strlen($u) > 16) {
        echo "Username must be between 3 and 16 characters";
        exit(); 
    } else if (is_numeric($u[0])) {
        echo 'Username cannot begin with a number';
        exit();
    } else {
    // END FORM DATA ERROR HANDLING
    // Begin Insertion of data into the database
    // Hash the password and apply your own mysterious unique salt
    $p_hash = md5($p);
    // Add user info into the database table for the main site table
    $sql = "INSERT INTO users (username, email, password, gender, ip, signup, lastlogin, notescheck) VALUES('$u','$e','$p_hash','$g','$ip',now(),now(),now())";
    $query = mysqli_query($db_conx, $sql); 
    $uid = mysqli_insert_id($db_conx);
    // Establish their row in the useroptions table
    $sql = "INSERT INTO useroptions (id, username, background) VALUES ('$uid','$u','original')";
    $query = mysqli_query($db_conx, $sql);
    // Create directory(folder) to hold each user's files(pics, MP3s, etc.)
    if (!file_exists("user/$u")) {
        mkdir("user/$u", 0755);
    }
    //Email the user their activation link
    //$to = "$e";    
//  $from = "[e-mail]";
//  $subject = 'yoursitename Account Activation';
//  $message = '<!DOCTYPE html><html><head><meta charset="UTF-8"><title>Dilingle Message</title></head><body style="margin:0px; font-family:Tahoma, Geneva, sans-serif;"><div style="padding:10px; background:#333; font-size:24px; color:#CCC;"><a href="http://www.dilingle.com"><img src="http://www.yoursitename.com/images/logo.png" width="36" height="30" alt="yoursitename" style="border:none; float:left;"></a>yoursitename Account Activation</div><div style="padding:24px; font-size:17px;">Hello '.$u.',<br /><br />Click the link below to activate your account when ready:<br /><br /><a href="http://www.yoursitename.com/activation.php?id='.$uid.'&u='.$u.'&e='.$e.'&p='.$p_hash.'">Click here to activate your account now</a><br /><br />Login after successful activation using your:<br />* E-mail Address: <b>'.$e.'</b></div></body></html>';
//  $headers = "From: $from\n";
//        $headers .= "MIME-Version: 1.0\n";
//        $headers .= "Content-type: text/html; charset=iso-8859-1\n";
//  mail($to, $subject, $message, $headers);
    echo "signup_success";
    exit();
    }
exit();
}
?>

就像我说的那样，PHP脚本末尾的 signup_success肯定会触发，但是上面的JS无法正确评估它。

Like I said, the "signup_success" at the end of the PHP script is definitely firing, but the JS above will not evaluate it correctly.

预先感谢！

推荐答案

假设参考PHP代码正确发布，您的脚本中就有空白：

Assuming that the reference PHP code is posted correctly, you have has leading whitespace in your script:

    <?php
^^^^

输出为：

    signup_success

尝试删除不必要的空格从脚本中删除或修剪responseText：

Try removing unnecessary whitespace from your script or trim the responseText:

if(ajax.responseText.replace(/^\s+|\s+$/g, "") == "signup_success") ...

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