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我一直在做通过 AJAX 传递的数据，但我之前没有看到任何这样的错误。它说：

TypeError: data is null

这是我的 JS：

$.ajax({
        url: "validations/mod_validations/step_one",
        type: 'POST',
        dataType: 'json',
        data: transfer_data,
        success: function (data) {

            if(data.category){
                $("#msg_error_display").fadeIn(100, function(){
                    $(this).find('span').html(data.category)
                });
                ajax_1 = 1;
            } else if(data.subcategory){
                $("#msg_error_display").fadeIn(100, function(){
                    $(this).find('span').html(data.subcategory)
                });
                ajax_1 = 1;
            } else if(data.mod_name){
                $("#msg_error_display").fadeIn(100, function(){
                    $(this).find('span').html(data.mod_name)
                });
                ajax_1 = 1;
            } else if(data.mod_version){
                $("#msg_error_display").fadeIn(100, function(){
                    $(this).find('span').html(data.mod_version)
                });
                ajax_1 = 1;
            } else if(data.success){
                ajax_1 = 0;
            }                 
        },
        error: function (e) {
            console.log(e.message);
        }
    });

这是我的传输数据：

var transfer_data = {
        category        :   $("#mod_add_category").val(),
        subcategory     :   $("#mod_add_subcategory").val(),
        mod_name        :   $("#mod_add_name").val(),
        mod_version     :   $("#mod_add_version").val()            
};

这是我的验证代码（我使用的是codeigniter，所以有我的控制器功能：

public function step_one(){
    $user_data = array(
        "category" => $this->input->post('category'),
        "subcategory" => $this->input->post('subcategory'),
        "mod_name" => $this->input->post('mod_name'),
        "mod_version" => $this->input->post('mod_version')
    );
    $report = array();

    $this->form_validation->set_rules('category', 'category', 'trim|required|callback_CheckCatForExists');
    $this->form_validation->set_rules('subcategory', 'subcategory', 'trim|required|callback_CheckSubCatForExists');
    $this->form_validation->set_rules('mod_name', 'modification name', 'trim|required|min_length[8]|max_length[50]|callback_CheckIfNameExists');
    $this->form_validation->set_rules('mod_version', 'modification version', 'trim|required');

    $this->form_validation->set_message('CheckIfNameExists', 'exists');
    $this->form_validation->set_message('CheckCatForExists', 'cat not exists');
    $this->form_validation->set_message('CheckSubCatForExists', 'subcat not exists');

    if ($this->form_validation->run() == FALSE){
        $report['errors'] = $this->form_validation->error_array();
    } else {
        $report['errors']  = array('success' => 'Passed');            
    }

    echo json_encode($report);
}

那么问题可能出在哪里？

4

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