So one of the features of the bot I am working on is that I can be on discord 'discreetly', meaning that I can have the idle status but if a friend knows what command to call, they can actually check if I am there. So in my index file I am using module.exports to store the variable that will contain the info that I set. In the other file, I have an array of values that depending on the value from the variable, the bot will respond with one of the phrases from the array. The problem is that when using the variable, I get an undefined response. Any ideas what I am doing wrong? Important to note
I have checked to make sure by putting an actual number and have gotten the correct response so it is an issue with the exporting. I also have the correct file path. I have also assigned variable info a number and gotten the same result. Edit: tried using the filepath as part of the variable in the array like so and got the same error
//This got me a new result so progress.
const filepath = filepath;
console.log(filepath); //This gets me {}
message.reply(activity[info]); //undefined
//new attempt that failed
//paraphrasing the filepath assignment
const filepath = filepath;
activity[filepath.info]
//first attempt
//from index
var info = message.content;
module.exports = info;
//from the other file
var activity = ["Ready to play","Chilling","Doing work","afk","can talk"];
console.log(activity[info]);
message.reply(activity[info]);
how to get a variable from a file to another file in node.js
So this is the solution to my problem
//index
var info = message.content;
module.exports.info = message.content;
//other file
const filepath = filepath;
var activity = [array of different values];
message.reply(activity[index.info]);
Thank you slothiful for you time in trying to help me. I really appreciate it
Related
I need to create many .json files for the system i am trying to develop. To do this, i ran a for loop over the file names i needed, then used fs.writeFileSync('filename.json', [data]).
However, when trying to open these later, and when I try to find them in the project folder, I cannot find them anywhere.
I have tried writing in a name that was less complex and should have appeared in the same directory as my script, however that was fruitless as well. To my understanding, even if my file name wasn't what I expected it to be, I should get at least something, somewhere, however I end up with nothing changed.
My current code looks like this:
function addEmptyDeparture(date) {
fs.readFileSync(
__dirname + '/reservations/templates/wkend_dep_template.json',
(err, data) => {
if (err) throw err
fs.writeFileSync(
getDepartureFileName(date),
data
)
}
)
}
function getDepartureFileName(date){
return __dirname + '/reservations/' +
date.getFullYear() +
'/departing/' +
(date.getMonth() + 1).toString().padStart(2, "0") +
date.getDate().toString().padStart(2, "0") +
'.json'
}
Where data is the JSON object returned from fs.readFileSync() and is immediately written into fs.writeFileSync(). I don't think I need to stringify this, since it's already a JSON object, but I may be wrong.
The only reason I think it's not working at all (as opposed to simply not showing up in my project) is that, in a later part of the code, we have this:
fs.readFileSync(
getDepartureFileName(date)
)
.toString()
which is where I get an error for not having a file by that name.
It is also worth noting that date is a valid date object, as I was able to test that part in a fiddle.
Is there something I'm misunderstanding in the effects of fs.writeFile(), or is this not the best way to write .json files for use on a server?
You probably are forgetting to stringify the data:
fs.writeFileSync('x.json', JSON.stringify({id: 1}))
I have tried to create similar case using a demo with writeFileSync() creating different files and adding json data to these ,using a for loop. In my case it works . Each time a new file name is created . Here is my GitHub for the same :-
var fs = require('fs');
// Use readFileSync() method
// Store the result (return value) of this
// method in a variable named readMe
for(let i=0 ; i < 4 ; i++) {
var readMe = JSON.stringify({"data" : i});
fs.writeFileSync('writeMe' + i + '.json', readMe, "utf8");
}
// Store the content and read from
// readMe.txt to a file WriteMe.txt
Let me know if this what you have been trying at your end.
I have a variable named, 'res'. This variable if used with console.log() print all request to a function. My question is... How to log this variable in a log.txt file?
Example using console.log(res)
Print in console:
[ 'AndroidShareANE',
'pixi.js',
'ShortSword',
'faceshiftparser',
'clmutils',
'chaikin-smooth',
'getuservideo',
'getboundingbox',
'clmdraw',
'SpriteSheetScrubberTutorial',
'interpolation-arrays',
This is a one part of response.
My purpose is log in log.txt file the var content. Identical to console.log() result.
Thanks for your collaboration, and sorry my bad english.
The easiest way is to create a new Console object that writes to your file. The docs have an example of this exact thing, which I'll reproduce here for posterity:
const output = fs.createWriteStream('./stdout.log');
const errorOutput = fs.createWriteStream('./stderr.log');
// custom simple logger
const logger = new Console(output, errorOutput);
// use it like console
var count = 5;
logger.log('count: %d', count);
// in stdout.log: count 5
If you don't pass the second argument (errorOutput) to new Console then the error output will also be written to the output file.
i am working on a project in which a nodejs program calls another program in a separate file.
this is how i've added the two:
var ocr = require('./index.js'); //this imports the file
var arr = ocr.ocr_pan(); //this calls the function in that file
am not sure but I guess the problem is that the process resumes before ocr.ocr_pan() returns the result and var arr becomes undefined.
or there is some problem in returning the result from ocr.ocr_pan()
I simply use return.
and I have also tried this : How to return array from module in NodeJS
didn't work
what more can be done?
Assuming that this file is the same directory as index.js file, code in index.js should be something like this:
// Write your function
var ocr_pan = function() {
// Do whatever you like
return result;
};
// Export it, make publicly visible to other files
module.exports = {
ocr_pan: ocr_pan
};
I have two files, one called filename and the second called app.js, both files are on the server side. From filename.js filder I am returing a value string from ensureAuthentication method to app.js file, so i export the function:
function ensureAuthentication(){
return 'tesstestest';
}
exports.ensureAuthentication = ensureAuthentication;
in app.js file i do following
var appjs = require('filename');
console.log(appjs.ensureAuthentication);
result is always is undifined in console??! why is that any idea?
You should try this in your app.js -
var login = require('filename');
console.log(login());
or you can use this :
var login = require('filename')();
console.log(login);
Explanation: Whenever you are exporting a function using exports you need to execute it to get the return value from it.
Try this:
var appjs = require('filename');
console.log(appjs.ensureAuthentication());
note the () after the function call. This will execute your function. The console.log() call will then print the returned value.
Try this, make sure both files are in the same directory. You have a few errors with your code. Missing brackets, and not importing correctly in app.js.
filename.js
function ensureAuthentication(){ // You are missing the brackets here.
return 'tesstestest';
}
exports.ensureAuthentication = ensureAuthentication;
app.js
var appjs = require('./filename'); // You are missing the ./ here.
console.log(appjs.ensureAuthentication()); // Logs 'tesstestest'
Two problems with your code:
You need to require with a relative path (notice the ./):
var appjs = require('./filename');
To get the string value you need to invoke ensureAuthentication as a function:
console.log(appjs.ensureAuthentication());
UPDATE
This update addresses the screenshot posted in the comments.
In the screenshot you pasted in the comments, you have the following line:
module.exports = router
That assigns a different exports object to the module. So your local reference to exports is no longer the same object.
Change that line to
module.exports = exports = router
Which will preserve the reference to exports which you use next.
Here you go with the working code
filename.js
function ensureAuthentication(){
return 'tesstestest';
}
module.exports = {
ensureAuthentication : ensureAuthentication
}
app.js
var appjs = require('./utils/sample');
console.log(appjs.ensureAuthentication());
I have a data variable sent to client-side, but it may not always be included as a variable in the express locals. If it doesn't exist, var data = !{JSON.stringify(data)}; returns var data = ; which causes a js error.
I've tried using conditionals prefixed with '-' but that doesn't seem to work.
script(type='text/javascript')
- if locals.data
var data = !{JSON.stringify(data)};
- else
var data = {};
How do I give it a default if locals.data is undefined?
Don't you hate it when you wrack your brain, then ask for help on SO, only to figure it out 5min later...
Looks like the following keeps the jade and javascript happy:
var data = !{ JSON.stringify(locals.data || '') };