Callback function error in Nodejs

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var bcrypt = require('bcrypt-nodejs');
var request = require('request');
var rest_api = require('../../config/rest_api')
var target="sivatest";
function chatMessages(user_name,target){
this.local = {
user_name: user_name,
target : target


 };
}
chatMessages.sendChatMessage = function(user_name,target,content){
    request.post({url:rest_api.message + user_name +'/'+target, body: {content:content}, json:true},function(err,res) {
        console.log("coming back after save chatMessages");
        if (err || res.statusCode !== 200){
            console.log("return unsuccessfully!");
            console.log(res.statusCode);
        }
        else{console.log("return successfully");}
        return;
    });

};

chatMessages.getChatMessage = function(user_name,target,callback){

    request(rest_api.messages+'/'+user_name+'/'+target,{json:true},function(err,res,body){
       console.log("test get");
        console.log(res);
       console.log(res.statusCode);
       if (err){
            callback(err,res);
            return;
        }
        if (res.statusCode === 200) {
            //window.alert("success");
            callback(null,body);
            return;
        }
        if (res.statusCode !== 200) {
            //window.alert("null");
            callback(null, null);
            return;
        }
    });
};

module.exports = chatMessages;

In the above code, I am able to get the message from my back end server and it shows the status code as 200 and the messages are retrieved correctly. However I get this error in the callback function where the status code reads 200:

TypeError: undefined is not a function
    at Request._callback (/Users/ranjani/fse-F14-SA3-SSNoC-Node-UI/app/models/chatRest.js:38:17)
    at Request.self.callback (/Users/ranjani/fse-F14-SA3-SSNoC-Node-UI/node_modules/request/request.js:121:22)
    at Request.emit (events.js:98:17)
    at Request.<anonymous> (/Users/ranjani/fse-F14-SA3-SSNoC-Node-UI/node_modules/request/request.js:985:14)
    at Request.emit (events.js:117:20)
    at IncomingMessage.<anonymous> (/Users/ranjani/fse-F14-SA3-SSNoC-Node-UI/node_modules/request/request.js:936:12)
    at IncomingMessage.emit (events.js:117:20)
    at _stream_readable.js:943:16
    at process._tickCallback (node.js:419:13

Can anyone suggest where I could be wrong? Thanks

edited 1 min ago

Ionică Bizău

16.7k

asked 1 min ago

NoobProg

1

Callback function error in Nodejs