I want to redirect to a url after the insert is success :
$(document).ready(function() {
$("#btn").on("click", function() {
$.post({
url:"/track/admin/affecterMenusProfil",
data:$("#frm").serialize()
});
});
});
router.post("/affecterMenusProfil", function(req, res) {
var profil = req.body.profil, menus = req.body.menus;
connexion.query("delete from "+db.getPrefixNomTables()+"profil_menu where profil_id ="+profil, function (errDel, rowsDel) {
if (errDel)
throw errDel;
async.eachOf(menus, function(menu, position, cb) {
connexion.query("insert into "+db.getPrefixNomTables()+"profil_menu(menu_id, profil_id) values("+menu+", "+profil+")", function (err, rows) {
if (err) throw err;
cb();
});
}, function() {
res.redirect('/track/');
});
});
});
But at runtime there is no redirection : the page of insertion is still displayed ! So what is wrong in my codes ?
Server won't redirect if your request from ajax.
In order to redirect you have to implement redirection logic on client side on success
callback.
$(document).ready(function() {
$("#btn").on("click", function() {
$.post({
url:"/track/admin/affecterMenusProfil",
data:$("#frm").serialize(),
success: function(response) {
window.location.href = response.url;
}
});
});
});
router.post("/affecterMenusProfil", function(req, res) {
var profil = req.body.profil, menus = req.body.menus;
connexion.query("delete from "+db.getPrefixNomTables()+"profil_menu where profil_id ="+profil, function (errDel, rowsDel) {
if (errDel)
throw errDel;
async.eachOf(menus, function(menu, position, cb) {
connexion.query("insert into "+db.getPrefixNomTables()+"profil_menu(menu_id, profil_id) values("+menu+", "+profil+")", function (err, rows) {
if (err) throw err;
cb();
});
}, function() {
res.send({url: '/track/'});
});
});
});
You have to send URL from Server and redirect that URL from the client side as above.
I hope it will help you.
Related
i'm beginner at nodejs, i got a problem when request multiple url in a loop then i render it.
Error: Can't set headers after they are sent.
at validateHeader (_http_outgoing.js:491:11)
at ServerResponse.setHeader (_http_outgoing.js:498:)
router.get('/', function(req, res, next) {
setInterval(function(){
request(url1,function (error,response,body) {
var data1 = JSON.parse(body);
request(url2+data1.access_token,function (error,response,body) {
var data_info = JSON.parse(body);
//error when it render
res.render('index', {data_info : data_info});
})
})
},5000);
});
That's not exactly a loop, I understand you mean that you call the same function repeteadly with setInterval().
Once you've sent your first response with res.render(), which finishes the response process for that request, subsequent attempts to use that res object fail.
If you want to send data to the client in 5 seconds interval you should probably either look into websockets or pass the setInterval() calls to the client so it polls your server each 5 seconds, in which case your server code could be changed to:
router.get('/', (req, res) => {
request(url1, (error, response, body) => {
const data1 = JSON.parse(body);
request(`${url2}${data1.access_token}`, (error, response, body) => {
const data_info = JSON.parse(body);
res.render('index', { data_info });
});
});
});
You can make use of Async Module
const async = require('async');
router.get('/', function (req, res, next) {
async.waterfall([
function(callback) {
request(url1, function (error,response,body) {
if(err) {
callback(err)
}else {
var data1 = JSON.parse(body);
callback(data1)
}
})
},
function(data1, callback) {
request(url2+data1.access_token, function(error,response,body) {
if(err) {
callback(err)
}else {
var data_info = JSON.parse(body);
callback(null, data_info)
}
})
}
], function(err, result) {
if(err) {
res.json({success: false, error: err, message: "Something went wrong.!"})
}else {
res.render('index', {
data_info : result
});
}
})
})
i have above api in TestRouter.js
TestRouter.js
router.get('/all', function(req, resp) {
var data = reportBo.getAll();
console.log(data);
resp.status(200);
resp.send(data);
return resp;
});
i am calling getAll() from TestRouter.js to TestDao.js.
it is working fine and can fetch the data and can print in console. but i am trying to send this result to TestRouter.js and i am trying to print it on console. but it is showing undefined.
TestDao.js
module.exports.getAll = function () {
var connection = myDB.get();
connection.collection('REPORTS').find({}).toArray(function (err, result) {
if (err) {
throw err;
} else {
//console.log(result);
return result;
}
});
};
module.exports.getAll = function (callback) {
var connection = myDB.get();
connection.collection('REPORTS').find({}).toArray(function (err, result) {
if (err) {
callback(err);
} else {
//console.log(result);
callback(null, result);
}
});
};
And in your router:
router.get('/all', function(req, resp) {
reportBo.getAll(function(err, data){
if(err){
resp.status(500);
} else {
resp.status(200);
resp.send(data);
}
});
});
This way of doing things with callbacks is quite common in Node JS. Also, there is a better way called Promises. You can read up on it.
I have used wikipedia-js for this project. This is my code for summary.js file.
var wikipedia = require("wikipedia-js");
var something = "initial";
module.exports = {
wikitext: function(topicname) {
console.log("Inside wikitex funciton :" + topicname);
var options = {
query: topicname,
format: "html",
summaryOnly: false,
lang: "en"
};
wikipedia.searchArticle(options, function(err, htmlWikiText) {
console.log("Inside seararticlefunciton :");
if (err) {
console.log("An error occurred[query=%s, error=%s]", topicname, err);
return;
}
console.log("Query successful[query=%s, html-formatted-wiki-text=%s]", topicname, htmlWikiText);
something = htmlWikiText;
});
return something;
},
};
This module I am using in /wiki/:topicname route. The corresponding code in index.js is like this.
router.get('/wiki/:topicname', function(req, res, next) {
var topicname = req.params.topicname;
console.log(topicname);
var first = summary.wikitext(topicname);
res.send("Hello "+first);
});
The problem is, everytime i visit a wiki/some-topic, the last return statement of summary.js executes before htmlWikiText is populated with content. So I always see hello initial on the browser page. Although after sometime it gets printed on terminal due to console.log statement.
So how should I resolve this issue?
I'm not going to try turning this code into synchronous. I'll just correct it to work as an asynchronous version.
You need to pass in callback to wikitext() and return the value in that callback. Here is the revised code of wikitext() and the route that calls it:
var wikipedia = require("wikipedia-js");
module.exports = {
wikitext: function(topicname, callback) {
console.log("Inside wikitex funciton :" + topicname);
var options = {
query: topicname,
format: "html",
summaryOnly: false,
lang: "en"
};
wikipedia.searchArticle(options, function(err, htmlWikiText) {
console.log("Inside seararticlefunciton :");
if (err) {
console.log("An error occurred[query=%s, error=%s]", topicname, err);
return callback(err);
}
console.log("Query successful[query=%s, html-formatted-wiki-text=%s]", topicname, htmlWikiText);
callback(null, htmlWikiText);
});
}
};
router.get('/wiki/:topicname', function(req, res, next) {
var topicname = req.params.topicname;
console.log(topicname);
summary.wikitext(topicname, function(err, result) {
if (err) {
return res.send(err);
}
if (!result) {
return res.send('No article found');
}
res.send("Hello "+result);
});
});
I am using node.js with socket.io to push real time notifications to users. However, currently I am just sending back a query result done in my socket.io code and sending it back to the client but I need to let socket know about the changes that occur and to either update with the changes or re-query the db to check for the new number and send that to the client.
For example if a user gets a friend request then the notification count will change and I want socket.io to push the new notification count number to the user.
here is my socket.io code in my app.js file:
io.on('connection', function(socket) {
var sessionID = socket.handshake.sessionID,
session = new connect.middleware.session.Session({ sessionStore: sessionStore }, socket.handshake.session)
console.log('socket: new ' + sessionID)
socket.broadcast.emit('arpNewConn', session.passport.user)
var intervalID = setInterval(function() {
socket.handshake.session.reload(function() {
socket.handshake.session.touch().save()
})
socket.emit('pulse', { heartbeat: new Date().toString(), timestamp: new Date().getTime() })
}, 300 * 1000)
socket.on('disconnect', function() {
console.log('socket: dump ' + sessionID)
socket.broadcast.emit('arpLostConn', session.passport.user)
clearInterval(intervalID)
})
socket.emit('entrance', {message: 'Message works'});
dbnotif.findOne(userID, function (err, user) {
if(err) throw err;
notify = user.notifications;
socket.emit('notify', {notific: notify});
});
});
Here is the client side:
div#CheckSocket
script(src='http://localhost:3000/socket.io/socket.io.js')
script.
$(document).ready(function () {
console.log('socket');
var socket = io.connect('http://localhost:3000/');
console.log('entered1');
socket.on('entrance', function (data) {
console.log('entered');
console.log(data.message);
});
socket.on('notify', function (data) {
console.log('noting');
console.log(data.notific);
if(data.notific !== 0)
$('.notifications').html(data.notific);
});
socket.on('reconnecting', function(data) {
setStatus('reconnecting');
console.log('entered2');
});
function setStatus(msg) {
console.log('connection status: ' + msg);
console.log('entered5');
}
});
Here is the example of adding a friend in the route file:
exports.addContactPost = function(req, res, err) {
async.waterfall([
function(callback) {
var success;
var newFriend = new Friend ({
userId: req.signedCookies.userid,
friend_id: mongoose.Types.ObjectId(req.body.otherUser),
friend_status: 1
});
newFriend.save(function(err){
if(err) {
console.log(err);
} else {
console.log("saved it");
success = true;
}
});
callback(null, success)
},
function(success, callback) {
//if(success === true) {
var success2;
var newFriend2 = new Friend ({
userId: mongoose.Types.ObjectId(req.body.otherUser),
friend_id: req.signedCookies.userid,
friend_status: 2
});
newFriend2.save(function(err){
if(err) {
res.send("request not received");
} else {
success2 = true;
}
});
callback(null, success2);
//} else {
// res.send("error with request sent");
//}
},
function(success2, callback) {
console.log('callback3');
//if(success2 === true) {
var success3;
Notification.findOneAndUpdate({userId: mongoose.Types.ObjectId(req.body.otherUser)}, {
$inc: {notifications: 1}
}, function(err, notify) {
if(err) {
res.send(err);
} else {
console.log(notify);
if(notify.added_notifications === true) {
// enable mail and include general u have got a new request... do not include name because not storing it
}
}
success3 = true;
callback(null, success3);
}],
function(err, results) {
res.json({response: true});
console.log("Add successful");
});
};
Notes: dbnotif is a model being called by mongoose,
userID is a global variable available to the file
I helped him solve this question offline, but we ended up using an EventEmitter as a proxy.
// main.js
var EventEmitter = require('events').EventEmitter;
var emitter = new EventEmitter();
Then add it to each request as middleware:
// elsewhere in main.js
app.use(function(req, res, next) {
req.emitter = emitter;
next();
});
Then in external routes file:
// routes.js
exports.addContactPost = function(req, res, err) {
req.emitter.emit( 'some-key', whatever, data, you, want );
};
I tried to use phantomjs for screen capturing my page with node-phantom bridge. Here is what I'm trying:
var phantom = require('node-phantom');
phantom.create(function (err, ph) {
return ph.createPage(function (err, page) {
return page.set('content', '<html><head></head><body><p>Hello</p></body></html>', function (err, status) {
return page.render('./content.png', function (err) {
ph.exit();
});
});
});
});
That works fine, but if I try to set content which contains javascript, that doesn't work. Please help me, why does it not work?
EDIT: This doesn't work:
var phantom = require('node-phantom');
phantom.create(function (err, ph) {
return ph.createPage(function (err, page) {
page.open("about:blank", function(err,status) {
page.evaluate(function() {
document.write('<html><head></head><body><script src="http://code.jquery.com/jquery-1.9.1.min.js"></script><script>$(function(){document.write("Hello from jQuery")})</script></body>');
});
setTimeout(function () {
return page.render('./content.png', function (err) {
ph.exit();
});
}, 5000);
});
});
JavaScript code needs some time to execute. Try to have a delay between setting the page content and calling render.
I am not sure why set content does not work, It seems to be a limitation of the phantomjs api. You can just use document.write.
var phantom = require('node-phantom');
phantom.create(function (err, ph) {
return ph.createPage(function (err, page) {
page.open("about:blank", function(err,status) {
page.evaluate(function() {
document.write('<html><body><script>document.write("<h1>Hello From JS</h1>");</script><p>Hello from html</p></body></html>');
});
return page.render('./content.png', function (err) {
ph.exit();
});
});
});
});
as ariya mentioned, time is needed. there is likely an 'onLoadFinished' event for this library (there is for the node lib i use). you can handle this without an arbitrary wait time by seeing my example at the bottom of this github issue: https://github.com/amir20/phantomjs-node/issues/68
Document.prototype.captureScreenshot = function(next) {
console.log(">> Rendering screencap for " + this.id)
var self = this;
phantom.create(function(ph) {
ph.createPage(function(page) {
page.setContent(self.html);
page.set("viewportSize", {
width: 1920,
height: 1080
});
page.set('onLoadFinished', function(success) {
var outputFile = './screenshots/screenshot-' + self.id + '.png';
page.render(outputFile);
ph.exit();
console.log(">> Render complete for " + self.id)
if (next)
next(outputFile);
})
});
});
}