javascript - CakePHP 3 : Ajax response is returning a 200 response code and a parsererror

Question

我正在尝试将 ajax 请求从 javascript 文件发送到 cakephp Controller 。 ajax 正在发送一个简单的 json 对象(为了简单起见，我在此示例中对其进行了硬编码)。

当我进行日志记录时，服务器能够将 json 字符串解码为一个对象。 $this->Votes->delete 函数调用成功。我的问题是一切正常，只是我仍然收到错误消息。

下面是我的代码，下面是我从中得到的输出。

Javascript:

function unvote() {
    $.ajax({
        type: 'POST',
        url: '../votes/unvote',
        async: false,
        contentType: 'application/json',
        dataType: 'json',
        data: JSON.stringify({'post_id':1}),
        success: function(data, textStatus, jqXHR){
            console.log(data);
            console.log(textStatus);
            console.log(jqXHR);
        }.
        error: function(jqXHR, textStatus, errorThrown){
            // this block gets triggered with a 200 response
            console.log(jqXHR);
            console.log(textStatus);
            console.log(errorThrown);
        },
    });
}

PHP:投票 Controller

public function unvote(){
    $this->autoRender = false;
    $vote = $this->Votes->newEntity();
    if ( $this->request->is('ajax') ) {
        $data = $this->request->input('json_decode');
        $vote = // get the correct vote from the database and save into this object
        if ( $this->Votes->delete($vote) ) {
            $this->response->body('Success');
            $this->response->statusCode(200);
        } else {
            $this->response->body('Failure');
            $this->response->statusCode(500);
        }
    }
    $this->response->type('json');
    return $this->response;
}

ajax 响应:

Object{ readyState=4, responseText="", status=200, statusText="Ok", more...}
parsererror
SyntaxError:JSON.parse: unexpected end of data at line 1 column 1 of the JSON data
> return window.JSON.parse( data + "" );

Answer 1

jQuery ajax 函数需要一个 json 对象，而您没有给它 json

这里有一些在 cakephp 中使用 ajax 的建议

• 我不会将 autorender 设置为 false。而是创建一个 ajax 布局。
• 如果要返回数据，需要设置_serialize View 变量

我建议做这样的事情。

$responseData = ['success' => true];
$this->set('responseData', $responseData);
$this->set('_serialize', ['responseData']);

文档中的强制性引用

JSON and XML Data Views

There are two ways you can generate data views. The first is by using the _serialize key, and the second is by creating normal template files

Using Data Views

The _serialize key is a special view variable that indicates which other view variable(s) should be serialized when using a data view.