I want to create a text file in javascript. I have tried this, but it doesn't work:
var file_name=dir+'/aaa.txt';
var fso = CreateObject('Scripting.FileSystemObject');
var s = fsoo.CreateTextFile(file_name, True);
s.Close();
I need to create an empty file to a path.
UPDATE1:
I have also tried this, but doesn't work. Also I can not import System.IO:
var file_name='aaa.txt';
StreamWriter sw = new StreamWriter(file_name);
sw.WriteLine("This is the line");
sw.Close();
UPDATE2:
I also have tryed to execute a unix comand that does 'touch file_name'. However this doesn't work either:
var sys = require('sys')
var exec = require('child_process').exec;
var child;
child = exec(\"touch\" + file_name, function (error, stdout, stderr) {
sys.print('stdout: ' + stdout);
sys.print('stderr: ' + stderr);
if (error !== null) {
console.log('exec error: ' + error);
}
});
Does anyone know how I should create a file in javascript?
This project on github looks promising:
https://github.com/eligrey/FileSaver.js
FileSaver.js implements the W3C saveAs() FileSaver interface in
browsers that do not natively support it.
Also have a look at the demo here:
http://eligrey.com/demos/FileSaver.js/
Node.js has a library called FS
FS Tutorial
You can easily create files using a built in function as so,
// include node fs module
var fs = require('fs');
// writeFile function with filename, content and callback function
fs.writeFile('newfile.txt', 'Learn Node FS module', function (err) {
if (err) throw err;
console.log('File is created successfully.');
});
Related
I'm trying to add a local file to the zip so when the user downloads and unzips, he'll get a folder with a .dll and a config.json file:
var zip = new JSZip();
options.forEach(option => {
zip.folder("REST." + option + ".Connector")
.file("config.json", "//config for " + option)
// I want this file to be from a local directory within my project
// eg. {dir}\custom_rest_connector_repository\src\dlls\Connectors.RestConnector.dll
.file('../dlls/Connectors.RestConnector.dll', null);
});
zip.generateAsync({type:"blob"}).then(function (blob) {
FileSaver.saveAs(blob, "REST_Connectors_"
+ dateStr
+ ".zip");
});
I read through the JSZip documentation but couldn't find an example or any information whether this can actually be done.
If it can't, is there any other more robust library that does support this operation?
Found the answer to my own question using the jszip-utils
JSZipUtils.getBinaryContent("../dlls/Connectors.RestConnector.dll", function (err, data) {
if(err) {
throw err; // or handle the error
}
zip.file("../dlls/Connectors.RestConnector.dll", data, {binary:true});
});
I've been trying this for a while, but I keep getting the error:
Error: Command failed: Invalid Parameter - /images
I installed ImageMagick and the gm package, so that's definitely not the problem.
gm(imageLocation)
.resize(100) // use your own width and height
.write('here.jpg', function (err) {
if (!err) console.log(' hooray! ');
else console.log(err);
});
imageLocation being ./images/3.jpg. Why does this error keep happening? I looked at the documentation
I'm on a Windows 32 bit machine. My server is supposed to get an image from a folder, resize it, and then display it. It seems like I have to write the resized photo and then display that, but the writing process always errors out and the image ends up being empty.
If there's a way to skip the writing part and just displaying the photo directly, that would be awesome too.
Thanks!
URL Query I used: http://localhost:8123/images/3.jpg
Complete code:
var querystring = require('querystring'); //used for parsing parts of urls
url = require('url');
http = require('http');
fs = require('fs');
gm = require('gm').subClass({ imageMagick: true });;
var server = http.createServer();
server.on('request', function(request, response){
var parsed_url = url.parse(request.url, true); //true gets the query as well
imageLocation = '.' + parsed_url.pathname;
gm(imageLocation)
.resize(100) // use your own width and height
.write('here.jpg', function (err) {
if (!err) console.log(' hooray! ');
else console.log(err);
});
if (getImage('here.jpg', response)){
//image is displayed
}
else{
respond404(parsed_url.pathname, response);
}
})
function respond404(path, response){
respond(404, "The requested path " + path + " was not found", response)
}
function getImage(location, response)
{
try{
var img = fs.readFileSync(location);
response.writeHead(200, {'Content-Type':'image/jpg'}); //parse this end
response.end(img, 'binary');
return true;
}catch(e){
return false;
}
}
server.listen(8123);
The answer Svbaker put can be used in Linux (maybe Mac as well?)
For Windows I got it to work by opening the command line in administrator mode and starting my server there.
I was able to get your code to work by changing how you required gm as follows:
var gm = require('gm');
I also had to remember to execute node with the correct permissions in my case:
sudo node server.js
At work I have to repeat this same process multiple times:
Open a certain Dreamweaver file.
Look for all <p> tags and replace then with <h1> tags.
Look for all </p> and replace with </h1>.
Look for the string 'Welcome' and replace with 'goodbye'.
Look for '0:01:00' and replace with '01:00'.
Copy everything in that file.
Create a new Dreamweaver file and paste everything in the new file.
Save the new file in a given directory and call it a certain name, which can be provided as a variable.
I don't need to run the JavaScript from a browser. It can be a JavaScript file which I just double click on the desktop.
Is it possible for me to do this with JavaScript / jQuery?
There are many other programming languages that you could accomplish this task with but if you really want to use Javascript then you could do the following:
var fs = require('fs');
if(process.argv.length < 4) {
console.log('Usage: node replace.js fromFilePath toFilePath');
return;
}
from = process.argv[2];
to = process.argv[3];
fs.readFile(from, { encoding: 'utf-8' }, function (err, data) {
if (err) throw err;
console.log('successfully opened file ' + from);
var rules = {
'<p>': '<h1>',
'</p>': '</h1>',
'Welcome': 'goodbye',
'0:01:00': '01:00'
};
for(var index in rules) {
console.log('Replacing ' + index + ' with ' + rules[index] + '...');
data = data.replace(new RegExp(index, 'gi'), rules[index]);
console.log('Done');
}
console.log("Result");
console.log(data);
console.log("Writing data to " + to);
fs.writeFile(to, data, function (err) {
if (err) throw err;
console.log('It\'s saved!');
});
});
INSTRUCTIONS
Download node.js from here
Install it
Create a file in C:\replace.js (Win) or ~/replace.js (Mac OS)
Put the code from above in replace.js
Open cmd (Ctrl+R on Win) or Terminal (on Mac OS)
Type node C:\replace.js <fileToReadFrom> <fileToSaveTo> on Win or node ~/replace.js <fileToReadFrom> <fileToSaveTo> on Mac OS
Done
I can't think of an elegant solution. But, what would be the best way to process an HTML file, modify it and save it back using a script on the command line? I want to basically run this script, proving the HTML file as an argument, add a data-test=<randomID> into every <div> element, and save it back into the file. I was thinking I could write a JavaScript script to execute with node but am not sure how I would get the contents of the provided file, or what to store the content as. Thanks for any pointers.
Solved with jsdom (thanks for the tip, user1600124):
var jsdom = require("jsdom"),
fs = require('fs');
if (process.argv.length < 3) {
console.log('Usage: node ' + process.argv[1] + ' FILENAME');
process.exit(1);
}
var file = process.argv[2];
fs.readFile(file, 'utf8', function(err, data) {
if (err) throw err;
jsdom.env(
data,
["http://code.jquery.com/jquery.js"],
function (errors, window) {
var $ = window.jQuery;
$("p, li").each(function(){
$(this).attr("data-test", "test");
});
$(".jsdom").remove();
console.log( window.document.doctype + window.document.innerHTML );
var output = window.document.doctype + window.document.innerHTML;
fs.writeFile(file, output, function(err) {
if (err) throw err;
console.log('It\'s saved!');
});
});
});
Right now I'm using this script in PHP. I pass it the image and size (large/medium/small) and if it's on my server it returns the link, otherwise it copies it from a remote server then returns the local link.
function getImage ($img, $size) {
if (#filesize("./images/".$size."/".$img.".jpg")) {
return './images/'.$size.'/'.$img.'.jpg';
} else {
copy('http://www.othersite.com/images/'.$size.'/'.$img.'.jpg', './images/'.$size.'/'.$img.'.jpg');
return './images/'.$size.'/'.$img.'.jpg';
}
}
It works fine, but I'm trying to do the same thing in Node.js and I can't seem to figure it out. The filesystem seems to be unable to interact with any remote servers so I'm wondering if I'm just messing something up, or if it can't be done natively and a module will be required.
Anyone know of a way in Node.js?
You should check out http.Client and http.ClientResponse. Using those you can make a request to the remote server and write out the response to a local file using fs.WriteStream.
Something like this:
var http = require('http');
var fs = require('fs');
var google = http.createClient(80, 'www.google.com');
var request = google.request('GET', '/',
{'host': 'www.google.com'});
request.end();
out = fs.createWriteStream('out');
request.on('response', function (response) {
response.setEncoding('utf8');
response.on('data', function (chunk) {
out.write(chunk);
});
});
I haven't tested that, and I'm not sure it'll work out of the box. But I hope it'll guide you to what you need.
To give a more updated version (as the most recent answer is 4 years old, and http.createClient is now deprecated), here is a solution using the request method:
var fs = require('fs');
var request = require('request');
function getImage (img, size, filesize) {
var imgPath = size + '/' + img + '.jpg';
if (filesize) {
return './images/' + imgPath;
} else {
request('http://www.othersite.com/images/' + imgPath).pipe(fs.createWriteStream('./images/' + imgPath))
return './images/' + imgPath;
}
}
If you can't use remote user's password for some reasons and need to use the identity key (RSA) for authentication, then programmatically executing the scp with child_process is good to go
const { exec } = require('child_process');
exec(`scp -i /path/to/key username#example.com:/remote/path/to/file /local/path`,
(error, stdout, stderr) => {
if (error) {
console.log(`There was an error ${error}`);
}
console.log(`The stdout is ${stdout}`);
console.log(`The stderr is ${stderr}`);
});