Javascript 在 REQUEST nodejs 中返回 json body
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Return json body in REQUEST nodejs
提问by Hirad Roshandel
I'm using the requestmodule to make an HTTP GET request to an url in order to get a JSON response.
我正在使用该request模块向 url 发出 HTTP GET 请求以获取 JSON 响应。
However, my function is not returning the response's body.
但是，我的函数没有返回响应的正文。
Can someone please help me with this?
有人可以帮我解决这个问题吗？
Here is my code:
这是我的代码：
router.get('/:id', function(req, res) {
var body= getJson(req.params.id);
res.send(body);
});
Here is my getJsonfunction:
这是我的getJson功能：
function getJson(myid){
// Set the headers
var headers = {
'User-Agent': 'Super Agent/0.0.1',
'Content-Type': 'application/x-www-form-urlencoded'
}
// Configure the request
var options = {
url: 'http://www.XXXXXX.com/api/get_product.php',
method: 'GET',
headers: headers,
qs: {'id': myid}
}
// Start the request
request(options, function (error, response, body) {
if (!error && response.statusCode == 200) {
return body;
}
else
console.log(error);
})
}
回答by Michael Anthopolous
res.send(body);
is being called before your getJson() function returns.
在 getJson() 函数返回之前被调用。
You can either pass a callback to getJson:
您可以将回调传递给 getJson：
getJson(req.params.id, function(data) {
res.json(data);
});
...and in the getjson function:
...在 getjson 函数中：
function getJson(myid, callback){
// Set the headers
var headers = {
'User-Agent': 'Super Agent/0.0.1',
'Content-Type': 'application/x-www-form-urlencoded'
}
// Configure the request
var options = {
url: 'http://www.XXXXXX.com/api/get_product.php',
method: 'GET',
headers: headers,
qs: {'id': myid}
}
// Start the request
request(options, function (error, response, body) {
if (!error && response.statusCode == 200) {
callback(body);
}
else
console.log(error);
})
}
or simply call:
或者干脆打电话：
res.json(getJson(req.params.id));
回答by chris-l
The problem is that you are doing a return, expecting that the router will get the content.
问题是你正在做一个返回，期望路由器会得到内容。
Since is an async callback, that will not work. You need to refactor your code to be async.
由于是异步回调，因此不起作用。您需要将代码重构为异步。
When you are doing return body;the function that is being returned is the callback of request, and in no part you are sending the body to the router.
当您执行return body;返回的函数是请求的回调时，您绝不会将主体发送到路由器。
Try this:
尝试这个：
function getJson(myid, req, res) {
var headers, options;
// Set the headers
headers = {
'User-Agent': 'Super Agent/0.0.1',
'Content-Type': 'application/x-www-form-urlencoded'
}
// Configure the request
options = {
url: 'http://www.XXXXXX.com/api/get_product.php',
method: 'GET',
headers: headers,
qs: {'id': myid}
}
// Start the request
request(options, function (error, response, body) {
if (!error && response.statusCode == 200) {
res.send(body);
} else {
console.log(error);
}
});
}
And this router:
还有这个路由器：
router.get('/:id', function(req, res) {
getJson(req.params.id, req, res);
});
Here, you are instead passing the resparam to the getJsonfunction, so the callback of request will be able to call it as soon as its able to do it.
在这里，您将res参数传递给getJson函数，因此请求的回调将能够尽快调用它。
