Ajax调用未返回期望值

Question

Stuck on why this isn't working, anyone got any ideas? It should update the button and i think it does, just displays the else at the end all the time

    function friendToggle(type,user,elem){
    var conf = confirm("Press Ok to confirm the '" +type+ "' action for user " + user);
    if(conf != true){
        return false;
    }

    O(elem).innerHTML = 'please wait...';

    params = user
    request = new ajaxRequest()
    request.open("POST", "friendSystem.php", true)
    request.setRequestHeader("Content-type", "application/x-www-form-urlencoded")
    request.setRequestHeader("Content-length", params.length)
    request.setRequestHeader("Connection", "close")

    request.onreadystatechange = function(){
        if(this.readyState == 4){
            if(this.responseText == "friend_request_sent"){
                O(elem).innerHTML = 'OK Friend Request Sent';
            }else if(this.responseText == "unfriend_ok"){
                O(elem).innerHTML = '<button onclick="friendToggle(\'friend\',\'echo $view;\',\'friendBtn\')">Request As Friend</button>';
            }else {
                alert(request.responseText);
                O(elem).innerHTML = 'Try again later';
            }
        }   
    }   
request.send("type="+type+"&user="+user);

}

This is the code it calls:

if($_POST['type'] == "friend")
{
    $friendCount = mysqli_fetch_row(querySQL("SELECT COUNT(*) FROM friends WHERE user='$user' AND accepted='1' OR friend='$user' AND accepted='1'"));

    $blockCount1 = mysqli_fetch_row(querySQL("SELECT COUNT(*) FROM blockedusers WHERE blocker='$user' AND blockee='$view' LIMIT 1"));

    $blockCount2 = mysqli_fetch_row(querySQL("SELECT COUNT(*) FROM blockedusers WHERE blocker='$view' AND blockee='$user' LIMIT 1"));

    $rowCount1 = mysqli_fetch_row(querySQL("SELECT COUNT(*) FROM friends WHERE user='$view' AND friend='$user' AND accepted='1' LIMIT 1"));

    $rowCount2 = mysqli_fetch_row(querySQL("SELECT COUNT(*) FROM friends WHERE user='$user' AND friend='$view' AND accepted='1' LIMIT 1"));

    $rowCount3 = mysqli_fetch_row(querySQL("SELECT COUNT(*) FROM friends WHERE user='$view' AND friend='$user' AND accepted='0' LIMIT 1"));

    $rowCount4 = mysqli_fetch_row(querySQL("SELECT COUNT(*) FROM friends WHERE user='$user' AND friend='$view' AND accepted='0' LIMIT 1"));

    if($friendCount[0] > 99){
        echo"$user currently has the maximum number of friends and cannot accept any more";
    }elseif($blockCount1[0] > 0){
        echo "$user has you blocked, we cannot proceed.";
    }elseif($blockCount2[0] > 0){
        echo"You must first unblock $user in order to friend them.";
    }elseif($rowCount1[0] >0 || $rowCount2[0] > 0){
        echo"You are already friends with $user.";
    }elseif($rowCount3[0] >0){
        echo"You have a pending friend request already sent to $user.";
    }elseif($rowCount4[0] > 0){
        echo"$user has requested to friend with you first. Check your friend requests";
    }else{
        querySQL("INSERT INTO friends VALUES('$user','$view','0')");
        echo"friend_request_sent";
    }

}       

its meant to echo the correct error message, but doesn't. Also will never send the friend request sent message

Answer 1

Your Content-length isn't right. It's set to the length of user but you send more than that in the POST data. It seems the web server is cutting your data up to the wrong length, then can't parse the malformed string.

Make your POST data into a variable, so you can get the length without duplicating it:

var data = "type="+encodeURIComponent(type)+"&user="+encodeURIComponent(user);
request.setRequestHeader("Content-length", data.length);

Then when you call send:

request.send(data);

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Side note: added encodeURIComponent to properly encode the values.