Problem receiving Javascript / axios callbacks - javascript

I am relatively new to JavaScript and seems to have a problem getting success/error callback functions to work while using Axios.
For example, running the following integration test code using jest (npm test command), I get the output listed below. I am wondering why the message 'my-ping-2 success.' or 'my-ping-3 error: ...' are not being printed on the console. I am trying to make sure that the caller of the inner functions can optionally pass-in callback functions for success and error situations. What am I doing wrong? Thanks in advance!!
Details:
I know that the local API server works fine, it returns HTTP status 200 if I visit URL http://localhost:9090/api/v1/ping and tests via Postman. I have listed the full source code below that can reproduce the problem on my machine (MacOS, nodejs version v12.16.1, npm version 6.13.4).
I am using the generic axios(config) method in the inner function because I am using the same inner function for HTTP get/post calls. I hope that is OK.
jest console output
PASS src/__tests__/01_my.test.js
● Console
console.log src/__tests__/01_my.test.js:14
my-ping-1...
console.log src/__tests__/01_my.test.js:20
my-ping-4 done.
Source code for reproduction of problem
import axios from "axios";
import { isEmpty, merge } from 'lodash';
const baseURL = 'http://localhost:9090/api/v1/';
const headers = {
Accept: 'application/json',
};
const source = axios.CancelToken.source();
test('Test my-appcode', done => {
console.log('my-ping-1...');
fw_get_1('/ping', function(response) {
console.log('my-ping-2 success.');
}, function(error) {
console.log('my-ping-3 error: ' + fw_jsonFormatter(error));
} );
console.log('my-ping-4 done.');
done();
});
function fw_get_1(url, successCallback = null,
errorCallback = null) {
return fw_get_2(url, {}, successCallback, errorCallback);
}
function fw_get_2(url, configs = {},
successCallback = null,
errorCallback = null) {
url = encodeURI(url);
return fw_request_3('get', url, configs, successCallback, errorCallback);
}
function fw_request_3(method, url, configs = {},
successCallback = null,
errorCallback = null) {
let inputCfgs = {
params: configs.params,
data : configs.data,
headers : configs.headers
};
const axiosOptions = merge(
{},
{
method,
url,
baseURL,
headers,
cancelToken: source.token
},
inputCfgs
);
return axios(axiosOptions).then( function(response) {
if (successCallback) {
console.log('fw_request_internal success-1 method: ' + axiosOptions.method + ' url: ' + axiosOptions.url);
successCallback(response);
} else {
console.log('fw_request_internal success-2 method: ' + axiosOptions.method + ' url: ' + axiosOptions.url);
}
}).catch(function (error) {
if (errorCallback) {
console.log('Calling input errorCallback method: ' + axiosOptions.method + ' url: ' + axiosOptions.url + fw_jsonFormatter(error));
errorCallback(error);
} else {
console.log('fw_request_internal error-2 method: ' + axiosOptions.method + ' url: ' + axiosOptions.url);
console.log(fw_jsonFormatter(error));
}
});
}
function fw_jsonFormatter(obj) {
return JSON.stringify(obj, null, 1);
}

For anyone who saw similar problem, it looks like the issue was that the test harness finished running before the callbacks could be called. I added a wait for a few seconds at the end of the test to confirm and now I am able to see all the console logs as expected. See the revised code below. I am writing some JS wrapper functions around REST APIs. Just want to make sure that the users of the wrapper functions can optionally override the callback functions. Please let me know if there is a better way to do this. Thank you!!
New console log
PASS src/__tests__/01_my.test.js (5.722s)
● Console
console.log src/__tests__/01_my.test.js:14
my-ping-1...
console.log src/__tests__/01_my.test.js:20
my-ping-4 done.
console.log src/__tests__/01_my.test.js:61
fw_request_internal success-1 method: get url: /ping
console.log src/__tests__/01_my.test.js:16
my-ping-2 success.
console.log src/__tests__/01_my.test.js:83
Waited 4 seconds
console.log src/__tests__/01_my.test.js:84
Finished test wait
Revised source code with wait at the end of tests.
import axios from "axios";
import {merge } from 'lodash';
const baseURL = 'http://localhost:9090/api/v1/';
const headers = {
Accept: 'application/json',
};
const source = axios.CancelToken.source();
test('Test my-appcode', done => {
console.log('my-ping-1...');
fw_get_1('/ping', function(response) {
console.log('my-ping-2 success.');
}, function(error) {
console.log('my-ping-3 error: ' + fw_jsonFormatter(error));
} );
console.log('my-ping-4 done.');
fw_test_end_wait(done, 'Finished test wait', 4 );
});
function fw_get_1(url, successCallback = null,
errorCallback = null) {
return fw_get_2(url, {}, successCallback, errorCallback);
}
function fw_get_2(url, configs = {},
successCallback = null,
errorCallback = null) {
url = encodeURI(url);
return fw_request_3('get', url, configs, successCallback, errorCallback);
}
function fw_request_3(method, url, configs = {},
successCallback = null,
errorCallback = null) {
let inputCfgs = {
params: configs.params,
data : configs.data,
headers : configs.headers
};
const axiosOptions = merge(
{},
{
method,
url,
baseURL,
headers,
cancelToken: source.token
},
inputCfgs
);
return axios(axiosOptions).then( function(response) {
if (successCallback) {
console.log('fw_request_internal success-1 method: ' + axiosOptions.method + ' url: ' + axiosOptions.url);
successCallback(response);
} else {
console.log('fw_request_internal success-2 method: ' + axiosOptions.method + ' url: ' + axiosOptions.url);
}
}).catch(function (error) {
if (errorCallback) {
console.log('Calling input errorCallback method: ' + axiosOptions.method + ' url: ' + axiosOptions.url + fw_jsonFormatter(error));
errorCallback(error);
} else {
console.log('fw_request_internal error-2 method: ' + axiosOptions.method + ' url: ' + axiosOptions.url);
console.log(fw_jsonFormatter(error));
}
});
}
function fw_jsonFormatter(obj) {
return JSON.stringify(obj, null, 1);
}
function fw_test_end_wait(done, msg, waitSecs) {
setTimeout(() => {
console.log('Waited ' + waitSecs + ' seconds');
console.log(msg);
done();}, waitSecs * 1000);
}

Related

Manipulate data from an async call

I have two functions,
function getRequest(url, api_key, callback) {
$.ajax({
url: url,
contentType: 'application/json',
type: 'get',
beforeSend: function(xhr){
xhr.setRequestHeader('Authorization', 'Bearer ' + api_key);
},
success: function(response) {
callback(response);
},
error: function(error) {
console.log(error);
document.getElementById("droplets").textContent = error;
}
});
}
function getDroplets(url, api_key) {
var request = getRequest(url, api_key, function(response) {
var droplets = response.droplets;
var numDroplets = droplets.length;
return {
droplets: droplets,
numDroplets: numDroplets
};
});
alert(request);
}
I want to have another function, let's call it listDroplets, that will call getDroplets() and manipulate the data returned from it. I'm not sure how to do this because getDroplets has an asynchronous call within it.
EDIT: I have tried the following, but it still doesn't work.
async function listDroplets() {
await getDroplets(api_url, api_key);
alert(request.numDroplets);
}
Here are how your functions could return promise like objects that you can use in an async await function:
function getRequest(url, api_key, callback) {
//to escape terrible jQuery Deferred and comfortably continue in Promise land
// you can do
// const deferred = $.ajax(...); return Promise.resolve(deferred)
return $.ajax({//return promise like object
url: url,
contentType: 'application/json',
type: 'get',
beforeSend: function (xhr) {
xhr.setRequestHeader('Authorization', 'Bearer ' + api_key);
}
});
}
function getDroplets(url, api_key) {
return getRequest(url, api_key)//return promise like object
.then(function (response) {//
var droplets = response.droplets;
var numDroplets = droplets.length;
return {
droplets: droplets,
numDroplets: numDroplets
};
})
.catch(function (error) {//implement error if something goes wrong
console.log(error);
document.getElementById("droplets").textContent = error;
});
}
async function listDroplets() {
//depending on how old your jQuery is you may want to do this:
// await Promise.resolve(getDroplets(api_url, api_key));
const request = await getDroplets(api_url, api_key);
//note that if something goes wrong then request is undefined (depending on jQuery version)
alert(request.numDroplets);
}

Processing replies from the javascript Fetch API

I'm struggling with dealing with my fetch() POST request. It's working successfully, and I can see the data just fine and work with it - but only within the fetch() call. I want to pass data back to App.js (I keep my fetch() API in its own utility module .js file)... but the timing is off. Based on console log debugging, it looks like the function that contains the fetch is returning to the original call before the fetch fully resolves.
These are the console results. The success/text object is what I return from the N4RecordScan.submit() function which contains my fetch(). Then a few lines later, we see the promise resolve. So my App.js is left hanging with no data.
I'd appreciate any guidance!! I feel like I'm close!
{success: "", text: ""}
Processing final response.
Fetch finished loading: OPTIONS
{argo:gateresponse: {…}, status: "0", statusid: "OK"}
Here'sa snippet from my App.JS which calls and processes the fetch function further down.
processResponse(myResponseObject) {
this.setState({
responseAlerts: this.state.responseAlerts.push(myResponseObject)
});
console.log('Processing final response. '+ myResponseObject.success + ' ' + myResponseObject.text);
}
sendRequest() {
let response = N4RecordScan.submit(this.interpolateRequest(), this.state.server, this.state.endpoint);
this.processResponse(response);
}
Here's the function where my fetch() resides:
export const N4RecordScan = {
submit(data, server, endpoint) {
let headers = new Headers();
let success = '';
let text = '';
headers.append('Content-Type', 'text/xml');
headers.append('SOAPAction', 'basicInvoke');
headers.append('Authorization', 'Basic ' + base64.encode(username + ":" + password));
let dataPrefix = '<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:arg="http://www.navis.com/services/argobasicservice"><soapenv:Header/><soapenv:Body><arg:basicInvoke><arg:scopeCoordinateIds>APMT/USLAX/LAX/LAX</arg:scopeCoordinateIds><arg:xmlDoc><![CDATA[';
let dataSuffix = ']]></arg:xmlDoc></arg:basicInvoke></soapenv:Body></soapenv:Envelope>';
data = dataPrefix + data + dataSuffix;
console.log('about to send ' + data);
fetch(server + endpoint, {
body: data,
method: 'POST',
mode: 'cors',
headers: headers,
credentials: 'include'
})
.then(function(response){
return response.text();
/* if (response.status === 200 || response.status === 0) {
// Success!
console.log('Success: ' + response.text());
return {
success: true,
text: response.text()
};
} else {
// Failure!
console.log('Fail: ' + response.statusText);
return {
success: false,
text: response.statusText
};
} */
} )
.then(function(rspText){
// The raw response contains decoded HTML tags... we need to clean that up.
// Remove dashes from the xml responses... the eventual js object wont like them
rspText = rspText.replace(/-/g, "");
// Convert the text response to XML
var parser = new DOMParser;
var dom = parser.parseFromString(
rspText,
'text/html');
var decodedString = dom.body.textContent;
// use the DOMParser browser API to convert text to a Document
var XML = new DOMParser().parseFromString(decodedString, "text/xml");
// and then use #parse to convert it to a JS object
var responseXmlObject = parse(XML);
console.log(responseXmlObject);
success = true;
text = responseXmlObject.messages;
alert(responseXmlObject.messages.messagedetail);
})
.catch(function(error) {
// Networking Failure!
console.log('NetworkFail: ' + error);
success = false;
text = error;
});
//.done();
console.log({
success: success,
text: text
});
return {
success: success,
text: text
};
}
};
The problem is you are mixing async and sync operations, you should be doing
processResponse(myResponseObject) {
this.setState({
responseAlerts: this.state.responseAlerts.push(myResponseObject)
});
console.log('Processing final response. '+ myResponseObject.success + ' ' + myResponseObject.text);
}
sendRequest() {
N4RecordScan.submit(this.interpolateRequest(), this.state.server, this.state.endpoint)
.then(function (response){
this.processResponse(response);
})
}
,
export const N4RecordScan = {
submit(data, server, endpoint) {
let headers = new Headers();
let success = '';
let text = '';
headers.append('Content-Type', 'text/xml');
headers.append('SOAPAction', 'basicInvoke');
headers.append('Authorization', 'Basic ' + base64.encode(username + ":" + password));
let dataPrefix = '<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:arg="http://www.navis.com/services/argobasicservice"><soapenv:Header/><soapenv:Body><arg:basicInvoke><arg:scopeCoordinateIds>APMT/USLAX/LAX/LAX</arg:scopeCoordinateIds><arg:xmlDoc><![CDATA[';
let dataSuffix = ']]></arg:xmlDoc></arg:basicInvoke></soapenv:Body></soapenv:Envelope>';
data = dataPrefix + data + dataSuffix;
console.log('about to send ' + data);
return fetch(server + endpoint, {
body: data,
method: 'POST',
mode: 'cors',
headers: headers,
credentials: 'include'
})
.then(function(response){
return response.text();
/* if (response.status === 200 || response.status === 0) {
// Success!
console.log('Success: ' + response.text());
return {
success: true,
text: response.text()
};
} else {
// Failure!
console.log('Fail: ' + response.statusText);
return {
success: false,
text: response.statusText
};
} */
} )
.then(function(rspText){
// The raw response contains decoded HTML tags... we need to clean that up.
// Remove dashes from the xml responses... the eventual js object wont like them
rspText = rspText.replace(/-/g, "");
// Convert the text response to XML
var parser = new DOMParser;
var dom = parser.parseFromString(
rspText,
'text/html');
var decodedString = dom.body.textContent;
// use the DOMParser browser API to convert text to a Document
var XML = new DOMParser().parseFromString(decodedString, "text/xml");
// and then use #parse to convert it to a JS object
var responseXmlObject = parse(XML);
console.log(responseXmlObject);
success = true;
text = responseXmlObject.messages;
alert(responseXmlObject.messages.messagedetail);
})
.catch(function(error) {
// Networking Failure!
console.log('NetworkFail: ' + error);
success = false;
text = error;
})
.then(function () {
console.log({
success: success,
text: text
});
return {
success: success,
text: text
};
})
//.done();
}
};
You should be returning the promise from fetch inside the submit function so that the function in App.js can wait until fetch is done to do processing

How to convert Ajax to Fetch API in JavaScript?

So I am using the JavaScript port of RiveScript which uses ajax and of course I don't want to use jQuery anymore. There is only one line ajax and I want to change it to the new Fetch API.
**FYI: You can see the ajax code in line 1795 of the CDN.**
So here's the original code:
return $.ajax({
url: file,
dataType: "text",
success: (function(_this) {
return function(data, textStatus, xhr) {
_this.say("Loading file " + file + " complete.");
_this.parse(file, data, onError);
delete _this._pending[loadCount][file];
if (Object.keys(_this._pending[loadCount]).length === 0) {
if (typeof onSuccess === "function") {
return onSuccess.call(void 0, loadCount);
}
}
};
})(this),
error: (function(_this) {
return function(xhr, textStatus, errorThrown) {
_this.say("Ajax error! " + textStatus + "; " + errorThrown);
if (typeof onError === "function") {
return onError.call(void 0, textStatus, loadCount);
}
};
})(this)
});
and here's what I tried so far using the Fetch API:
return fetch(file, {
dataType: "text"
})
.then(function(_this) {
return function(data, textStatus, xhr) {
_this.say("Loading file " + file + " complete.");
_this.parse(file, data, onError);
delete _this._pending[loadCount][file];
if (Object.keys(_this._pending[loadCount]).length === 0) {
if (typeof onSuccess === "function") {
return onSuccess.call(void 0, loadCount);
}
}
};
})
.catch(function(_this) {
return function(xhr, textStatus, errorThrown) {
_this.say("Ajax error! " + textStatus + "; " + errorThrown);
if (typeof onError === "function") {
return onError.call(void 0, textStatus, loadCount);
}
};
})
The app code:
var bot = new RiveScript();
bot.loadFile("./brain.rive", loading_done, loading_error);
function loading_done (batch_num) {
console.log("Batch #" + batch_num + " has finished loading!");
bot.sortReplies();
var reply = bot.reply("local-user", "Hello, bot!");
console.log("The bot says: " + reply);
}
function loading_error (error) {
console.log("Error when loading files: " + error);
}
Using the Fetch API, I'm not seeing any error now though I'm also not seeing any error or success messages.
Am I missing something here?
The fetch init object doesn’t have a dataType key.
To indicate you want plain text back, add an Accept: text/plain header to the request:
fetch(file, {
headers: {
"Accept": "text/plain"
},
})
And the fetch call returns a promise that resolves with a Response object, and that Response object provides methods that resolve with text, JSON data, or a Blob — which means the basic form for handling the response from your fetch(…) call is like this:
fetch(file, {
headers: {
"Accept": "text/plain"
},
})
.then(response => response.text())
.then(text => {
// Do something with the text
})
So you need to take the existing code in the question and fit it into that form.

AngularJS promise undefined

I have read several examples on the web and issues here on SO but I'm still missing something.
I have a service to fetch order data from my API. I want to resolve the promise inside the service. The console.log inside the service logs the correct data.
However, in my controller i get "TypeError: Cannot read property 'then' of undefined"
I thought the controller function would wait for the data to be resolved?
Service
angular.module('app')
.factory('orderService', function($http) {
// DECLARATIONS
var baseUrl = 'http://api.example.com/';
var method = 'GET';
var orderData = null;
return {
getOrderData: getOrderData
};
// IMPLEMENTATIONS
function getOrderData(ordernumber) {
// order data does not yet exist in service
if(!orderData) {
dataPromise = $http({
url: baseUrl + 'order/' + ordernumber,
method: method,
withCredentials: true,
headers: {
'Content-Type': 'application/json'
}
// success
}).then(function(response) {
orderData = response.data;
console.log('Received data: ' + JSON.stringify(response.data));
return orderData;
},
// faliure
function(error) {
console.log("The request failed: " + error);
});
// order data exist in service
} else {
console.log('Data present in service: ' + orderData);
return orderData;
}
} // end: getOrderData function
}); // end: customerService
Controller
app.controller('orderController', function($scope, $stateParams, orderService) {
$scope.ordernumber = $stateParams.order;
orderService.getOrderData($scope.ordernumber)
// success
.then(function(response) {
$scope.order = response;
console.log('Controller response: ' + response);
},
// faliure
function(error) {
console.log("The request failed: " + error);
});
});
your function getOrderData doesn return a promise
function getOrderData(ordernumber) {
var deferred = $q.defer();
// order data does not yet exist in service
if(!orderData) {
dataPromise = $http({
url: baseUrl + 'order/' + ordernumber,
method: method,
withCredentials: true,
headers: {
'Content-Type': 'application/json'
}
// success
}).then(function(response) {
orderData = response.data;
console.log('Received data: ' +
JSON.stringify(response.data));
deferred.resolve(orderData);
},
// faliure
function(error) {
deferred.reject(error);
console.log("The request failed: " + error);
});
// order data exist in service
} else {
console.log('Data present in service: ' + orderData);
deferred.resolve(orderData);
}
else {
deferred.reject('Not set!');
}
return deferred.promise;
} // end: getOrderData function

AngularJS service to send Twilio SMS messages

I've been experimenting with creating an AngularJS service that can be called from the controller and send text messages based on particular events in the application. The implementation is based on this, and works as follows:
Firstly, we have the service:
function BusinessService($http) {
this.twilioSMS = {
sendMessage: function(to, from, body) {
var accountSid = 'xxx';
var authToken = 'xxx';
var testEndpoint = 'https://api.twilio.com/2010-04-01/Accounts/' + accountSid + '/SMS/Messages.json';
var liveEndpoint = 'https://api.twilio.com/2010-04-01/Accounts/' + accountSid + '/Messages.json';
var data = {
To: to,
From: from,
Body: body
};
$http({
method: 'POST',
url: testEndpoint,
data: data,
dataType: 'json',
contentType: 'application/x-www-form-urlencoded',
beforeSend: function(xhr) {
xhr.setRequestHeader("Authorization",
"Basic " + btoa(accountSid + ":" + authToken) // !
);
},
success: function(data) {
console.log("Got response: %o", data);
if (typeof successCallback == 'function')
successCallback(data);
},
error: function(jqXHR, textStatus, errorThrown) {
console.log("Request failed: " + textStatus + ", " + errorThrown);
if (typeof failCallback == 'function')
failCallback(jqXHR, textStatus, errorThrown);
}
})
}
}
}
Then setting it up in the controller:
function ConsumerBusinessProfileCtrl($scope, BusinessService) {
$scope.sendMessage = function(to, from, body) {
return BusinessService.twilioSMS.sendMessage(to, from, body)
}
}
And then calling it from the view:
<a ng-click="sendMessage('+12345678901', '+15005550006', 'Hey Jenny! Good luck on the bar exam!')">Send Message</a>
I've tested the jsfiddle example with my accountSid, authToken, and phone numbers and it is working fine. But my implementation fails with a 401 (UNAUTHORIZED) error. A part of me thinks that this is because $http does not support beforeSend or afterSend. But I am not sure? Can anybody here guide me in the right direction?
Changed $http to the following to fix things:
$http({
method: 'POST',
url: testEndpoint,
data: data,
transformRequest: function(obj) {
var str = [];
for (var p in obj)
str.push(encodeURIComponent(p) + "=" + encodeURIComponent(obj[p]));
return str.join("&");
},
headers: {
'Authorization': 'Basic ' + btoa(accountSid + ':' + authToken),
'Content-Type': 'application/x-www-form-urlencoded'
},
}).success(function(response) {
console.log(response);
}).error(function(error) {
console.log(error);
});
}

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