如何使用.execute时传递额外的参数给回调JavaScript函数（）？ [英] How to pass additional arguments to callback functions in javascript when using .execute()?

问题描述

我和JavaScript来谷歌Analytics API的工作，但我并不比JS新手多。我有C ++和Java知识，我可以用逻辑思维相处，但有些事情困扰我。在GA API我可以做一个函数调用是这样的：

I'm working with javascript for Google Analytics API but I'm no more than a novice in JS. I have C++ and Java knowledge and I can get along with logical thinking but some things puzzle me. In GA API I get to make a function call like this:

gapi.client.analytics.data.ga.get({'ids':'<tableID>',
    'start-date':'<startDate>',
    'end-date':'<endDate>',
    'metrics':'<metrics>',
    'filters':'<filters>',
    'samplingLevel':'HIGHER_PRECISION',}).execute(putToVar);

putToVar（）像这样定义一个用户定义的函数：

putToVar() is a user defined function defined like so:

function putToVar(results)
{
    //do processing with the results
}

这是我的理解是， .execute（）方法用于调用回调函数异步调用 gapi.client.analytics。 data.ga.get（）。所以我想什么功能1（）执行（函数2）做的是调用函数2 从返回值功能1 作为参数？这是正确的？

It is my understanding that the .execute() method is used to invoke a callback function for the asynchronous call gapi.client.analytics.data.ga.get(). So I assume what function1().execute(function2) does is call function2 with the return value from function1 as argument? Is this correct?

我在一个情况下，我需要应用几个不同的过滤器，并将其存储在一个数组作为需要时进行检索，而不论该API调用是否返回一个结果对象（这是一个异步调用，所以我不知道当响应到来的时候，它是唯一可见的回调函数）。

I'm in a situation where I need to apply several distinct filters and store them in an array to retrieve as and when required, irrespective of whether the API call returned a results object (it is an async call, so I don't know when the response comes, it is only visible to the callback function).

我想传递给回调函数数组中来存储返回的对象，这样我可以按需以后检索它们的尺寸，而不必担心其中的响应得到处理的顺序。我这样说是因为，最初我尝试了为循环，我在其中得到了回应我的API调用的顺序不一样，我在其中放置API调用的顺序我的查询，所以有不匹配。

I would like to pass to the callback function the dimensions of the array in which to store the returned objects so that I can retrieve them on demand later, without worrying about the order in which the responses get processed. I say this because, initially I tried a for loop and the order in which I got the response to my API calls were not the same as the order in which I placed API calls for my queries, so there were mismatches.

由于参考使用这个方法来调用回调函数，我想知道如何使用时，通过附加参数像这样一个回调函数 .execute（）方法，当我写 putToVar（）函数是这样的：

Since the reference uses this method to invoke the callback function, I would like to know how to pass additional arguments to a callback function like this when using .execute() method, when I get to write putToVar() function something like this:

function putToVar(results,arrayDim)
{
    //Process Results
    //Store in Array[arrayDim] the required value
}

我希望我已经说清楚了。
我已阅读下列职位

I hope I have made myself clear. I have read the following posts

• How做我多个参数传递到JavaScript回调函数？


• 传递参数给回调


• How解释用简单的英语回调？如何从另一个函数调用一个函数不同？


• How传递额外的参数来回调，并访问默认参数？

• How do I pass multiple arguments into a javascript callback function?
• passing arguments to callback
• How to explain callbacks in plain english? How are they different from calling one function from another function?
• How to pass additional arguments to callbacks and also access default parameters?

但他们都不使用 .execute（）方法，我无法弄清楚如何使用他们的说法。或者说，是否以及如何我 .execute（）方法（回调执行型）可以进行修改，以帮助我的目的。

but none of them seem to use the .execute() method and I cannot figure out how to use what they have said. Or, if and how my .execute() method (type of callback execution) can be modified to help my purpose.

推荐答案

添加关闭将解决您的问题：

Adding a closure would solve your problem:

for(var x = 0; x< n x ++){  //Or any other loop
   (function(x){   //Closure. This line does the magic!!
       var arrayDim = something_that_depends_on_x_or_the_loop,
           param2 = some_other_thing_that_depends_on_x;
       gapi.client.analytics.data.ga.get({'ids':'<tableID>',
         'start-date':'<startDate>',
          ...
       }).execute(function putToVar(results){   //this fn is defined inline to get access to param1, param2
           //The following alerts will use the *correct* variables thanks to the closure
           alert(x);
           alert(arrayDim);
           alert(param2);
       });
   })(x); //This one too
}

闭合确实神奇。这将允许每个循环有它自己的变量（不共享），所以适当的人会在 putToVar 时执行。

我希望这是明显的，如果没有，只是让我知道。

I hope it's clear, if not, just let me know.

只是测试一下吧！

欢呼声中，来自拉巴斯，玻利维亚

Cheers, from La Paz, Bolivia

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