来自 ajax 调用的 JSON 输入意外结束

Question

I've been working on a delete post functionality in my project. It all works fine in PHP, but now I'd like to do that in Ajax, to prevent the refresh and all.

Anyway, when I perform my ajax call, I get an error:

SyntaxError: Unexpected end of JSON input
at Object.parse (native)
at n.parseJSON (http://localhost/imdstagram/public/js/jquery-2.2.3.min.js:4:6401)
at Ab (http://localhost/imdstagram/public/js/jquery-2.2.3.min.js:4:8347)
at z (http://localhost/imdstagram/public/js/jquery-2.2.3.min.js:4:11804)
at XMLHttpRequest.<anonymous> (http://localhost/imdstagram/public/js/jquery-2.2.3.min.js:4:15680)

It says that this error is on line 35, line 35 sends me to

console.log(error);

Anyway, to give you a better view, here is my Ajax call:

$(document).ready(function(){

    $(".post__delete").on("click", function(e){
        var postDeleteID = $('.deleteID').val();

        $.ajax({
            url: "ajax/deletePost.php", 
            type: "POST",             
            data: JSON.stringify(postDeleteID),
            dataType: 'json',
            contentType: false,
            cache: false,
            processData: false,
            success: function(data)
            {

            },
            error: function (request, status, error) {
                console.log(error);
            }
        });

        e.preventDefault();
    });
});

And my deletePost.php code:

<?php
    include_once("../classes/Post.class.php");
    session_start();
    $post = new Post();

    if(!empty($_POST)){
        $deletePostID = $_POST['deletePostID'];

        $post->deletePost($deletePostID);

        if($post->deletePost($deletePostID)){
            $status['delete'] = "success";
        } else {
            $status['delete'] = "failed";
        }

        header('Content-Type: application/json; charset=utf-8', true);
        echo json_encode($status);
    }

?>

I've tried many things like changing the dataType and contentType, but nothing seems to work out.

Answer 1

Your request is wrong, you should not be sending json if you expect to use the $_POST super global. Send it as regular url encoded form data

    $.ajax({
        url: "ajax/deletePost.php", 
        type: "POST",             
        data: {postDeleteID: postDeleteID},
        dataType: 'json',
        cache: false,
        success: function(data)
        {

        },
        error: function (request, status, error) {
            console.log(error);
        }
    });

Answer 2

尝试将 dataType 更改为 'text' 并将 contentType 更改为 'application/json'

Answer 3

You are "deleting" the post twice.

Remove this line: $post->deletePost($deletePostID);

Answer 4

This is a very strange problem within frameworks and PHP in general, in your controller just:

echo(json_encode($status));

Has worked for me ..