如何在Javascript中将数据返回到原始调用函数？

Question

我有一个问题,将数据返回到我希望它返回的函数.代码如下:

function ioServer(request_data, callback)
{
    $.ajax({
        cache: false,
        data: "request=" + request_data,
        dataType: "json",
        error: function(XMLHttpRequest, textStatus, errorThrown){},
        success: function(response_data, textStatus){
            callback(response_data);
            },
        timeout: 5000,
        type: "POST",
        url: "/portal/index.php/async"
    });
}   

function processRequest(command, item, properties)
{
    var request = {};
    request.command = command;
    request.item = item;
    request.properties = properties;
    var toServer = JSON.stringify(request); 
    var id = ioServer(toServer, processResponse);
    return id;
}

function processResponse(fromServer)
{
    if (fromServer.response == 1)
    {
        return fromServer.id;   
    }   
}

我通过调用另一个函数中的processRequest函数来调用这段代码.发送请求和检索响应工作正常.但是,我需要将响应中的值'id'返回给processRequest函数,因此它可以将该值返回给它的调用者.据我所知,processResponse中的返回值返回$ .ajax,但是我需要它返回到processRequest.

BTW processResponse中的if语句是指服务器端PHP脚本设置的值,用于判断是否允许该请求(例如,如果用户未登录,则fromServer.response将为0).它与$ .ajax对象的成功/错误例程没有任何关系.

非常感谢您的帮助.

@Jani:感谢你的回复,但是你能澄清一下吗？需要'id'的函数具有以下代码:

$(#tabs).tabs('add', '#tab-' + id, 'New tab');

你是说我应该尝试在processResponse函数中执行这段代码吗？因为那不是我打算做的; 这些功能旨在成为维护状态服务器端的通用解决方案.这就是我避免将这段代码放在那里的原因.

Answer 1

我想也许这更接近你所寻找的......

function ioServer(request_data, callback)
{
    $.ajax({
        cache: false,
        data: "request=" + request_data,
        dataType: "json",
        error: function(XMLHttpRequest, textStatus, errorThrown){},
        success: function(response_data, textStatus){
                processResponse(response_data, callback);
                },
        timeout: 5000,
        type: "POST",
        url: "/portal/index.php/async"
    });
}   

function processRequest(command, item, properties, callback)
{
    var request = {};
    request.command = command;
    request.item = item;
    request.properties = properties;
    var toServer = JSON.stringify(request); 
    ioServer(toServer, callback);
}

//internal callback to handle response code
function processResponse(fromServer, callback)
{
    if (fromServer.response == 1)
    {
        //call the callback with the id
        callback(fromServer.id);   
    }   
    else
    {
        //You have to remember to call the callback no matter what
        //or the caller won't know when it's complete
        callback(null);  //or some other "didn't get a valid response" value
    } 
}