javascript - In NodeJs how can I wait until my http get is finished? -

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• how return response asynchronous call? 21 answers

edit: want explain problem more clearly, purpose make http response before "webot.waitrule()" returns. should http request call webot.waitrule or other way around?

below code implements module in program, , problem function returns before http request response. know http requests in node js async, there solution it？ pretty new in javascript , nodejs. thanks.

 webot.waitrule('wait_class', function(info) {     var coursename='lol';      var options = {         host: 'api.uwaterloo.ca',         path: '/v2/courses/cs/486/examschedule.json'       };       callback = function(response) {           var str = '';   //another chunk of data has been recieved, append `str`           response.on('data', function (chunk) {           str += chunk;         });           response.on('end',function(){         // console.log(str);          // return "kkk";          var data = json.parse(str);          console.log(data['data']['course']);          coursename = coursename+data['data']['course'];          console.log("finished");          // return "lolllll";          // return "nide ke shi "+ coursename;       });     }     var req = http.request(options, callback);     req.end();     console.log("i finshed");      return coursename;   }); 

since node asynchronous , uses callbacks (as opposed promises), you'd want define function called takes parameter output of asynchronous call.

for example (in case): coursename in callback response.on('end', .... define function such as:

function processcoursename(name) {     console.log('do with', name); } 

and after console.log('finished');, add call method

... coursename = ... console.log("finished"); processcoursename(coursename); //whenever request finished, process course name in separate function 

more explanation: return coursename statement exiting function before http.request call finished, , therefore before coursename assigned proper value.

more edit: took @ webot module , looks written in way doesn't support async code? libraries pass callback function can call when async processing done, function(info, callback) {}, webot not appear to. best bet might assign coursename info object (info.coursename) given , notify program use coursename elsewhere.

notes:

• you should use somthing mikeal/request make requests outwards, it's written so.