async.js

问题 Could someone please explain why I keep seeing the Error: Callback was already called . I feel I have covered all cases - so why would be 'already called': function addVertices(outercallback) { async.forEachLimit(fullData, 25, function (data, innercallback) { myJson.matches.forEach(function (oMatches) { if (data.$.id == oMatches.SourceId) { oMatches.Ids.forEach(function (oId) { client.execute("g.addV('test').property('id', \"" + oId + "\")", {}, (err, results) => { if (err) { return

问题 I wrote an async function that needs to call a program in the server and that program generate a file which needs to load in UI for displaying. I am not sure how to show the result in my UI since execFile is async function and it may take few second results to be ready? Do I need to have kind of infinity loop to check the result is ready in the server? I am using nodejs-express handlebars. router.post('/',function(req, res, next) { const child = execFile('program.exe', ['in.sql'], (error,

问题 I'm using Node.js and the async library, however I keep seeing the error: Callback was already called . I think I understand why I get the error, however I don't know if it is actually possible to do the following/how can resolve. Basically I want both the innercallbacks to have completed before the outercallback is completed. So the code with which I am facing this issue looks like: async.forEachLimit(inData, 25, function (data, innercallback) { myJson.matches.forEach(function (oMatches) {

问题 I'm writing a test code which gathers the result from Web APIs on node.js by using 'request.js' and 'async.js'. Here's my sample code; var request = require('request'); var async = require('async'); var addresses = [ "Tokyo", "Moscow", "Bagdhad", "Mountain View", "New York", ]; function accessUrl( address, callback ) { options ={ headers: {'user-agent': 'Mozilla/5.0'}, url: 'http://api.openweathermap.org/data/2.5/weather?q=' + address, json: true }; request.get(options, function(err, response

问题 I am using async module with waterfall method. async.waterfall([ function(callback) { ... callback(err); }, function(result, callback) { console.log("This function should not be executed"); } ], function(err) { if (err) { next(err); return; } } ); But the second function always execute. How to prevent it? 回答1: Try adding a return async.waterfall([ function(callback) { ... return callback(err); //note return here }, function(result, callback) { console.log("This function should not be executed

问题 I consider myself a very experienced node.js developer. Yet I still wonder if there is a better way to write the following code so I don't get the pyramid of doom... Now I went easy on you, I have some code that my pyramid gets as high as 20 floors, no kidding; and that's WITH using async.js !!! The problem is really that I have many dependencies on previews variables so everything must be nested. The guy that wrote the book "Async Javascript, build more responsive Apps with less code"

问题 Given the following node.js module, how would I call the functions in the array orderedListOfFunctions passing each one the response variable? var async = require("async"); var one = require("./one.js"); var two = require("./two.js"); module.exports = function (options) { var orderedListOfFunctions = [ one, two ]; return function (request, response, next) { // This is where I'm a bit confused... async.series(orderedListOfFunctions, function (error, returns) { console.log(returns); next(); });

问题 Given the following node.js module, how would I call the functions in the array orderedListOfFunctions passing each one the response variable? var async = require("async"); var one = require("./one.js"); var two = require("./two.js"); module.exports = function (options) { var orderedListOfFunctions = [ one, two ]; return function (request, response, next) { // This is where I'm a bit confused... async.series(orderedListOfFunctions, function (error, returns) { console.log(returns); next(); });

问题 My backend code looks like: exports.getDashboard = (req, res) => { const dashboard = {}; const query = {}; let start; let end; async.parallel([ (callback) => { const { role } = req.user; switch (role) { case 'Admin': console.log('case admin is working >> >> >> >> >> >> >> >> >> >> '); start = moment().startOf('day'); // set to 12:00 am today end = moment().endOf('day'); // set to 23:59 pm today query.where = { entryTime: { $gt: start, $lt: end, }, }; break; case 'Manager': console.log('case

问题 I'm using the async module's forEachOf method to print the end result after iterating through an object. Here is a shortened version of what I'm doing: var async = require('async'), cheerio = require('cheerio'), request = require('request'); var returnArray = []; async.forEachOf(myObj, function (value, key, callback) { var anotherObj = {}; anotherObj.type = "val1"; request(someurl, function(err, res, body) { if (err) { return callback(err); } var $ = cheerio.load(body); anotherObj.name =