jsreport doesn't render text - javascript

I have the following code , the result is a pdf which doesn't have any visible text in it. (I guess it renders it as the same color of the background even thoguh we change its colour in the inline style of the html)
var client = require("jsreport-client")('https://localhost:443');
var output = '<html><body><h1 style="color:blue;margin-left:30px;">This is a heading.</h1></body></html>';
client.render({
template: { content: output }
}, function(err, pdfResp) {
pdfResp.pipe(res);
});
When we copy and paste the content of the pdf into a text pad , the result is :
ihsish issi aa gheadinhadinge
Any idea how to solve it ?

I would guess phantomjs is missing some dependencies (fonts) required for rendering pdf. It runs for me if I spin up fresh centos VM on azure but I see people complaining sometimes required phantomjs dependencies are not preinstalled. Adding the missing package depends on your distribution
For example on ubuntu you may need to run:
sudo apt-get install build-essential chrpath git-core libssl-dev libfontconfig1-dev
on centos
sudo yum install freetype fontconfig

Related

youtube-dl showing Error: Command failed with exit code 1

I have created node js function for download youtube videos.
when I run the function following error is showing:
youtube-dl showing Error: Command failed with exit code 1: \node_modules\youtube-dl\bin\youtube-dl.exe --dump-json --format=18 --encoding utf8 http://www.youtube.com/watch?v=4FDud9Lj5HY
const video = youtubedl(
url,
// Optional arguments passed to youtube-dl.
['--format=18'],
// Additional options can be given for calling `child_process.execFile()`.
{ cwd: __dirname }
);
video.on('info', function (info) {
const _data = {
thumbnail: info.thumbnails[info.thumbnails.length - 1].url,
size: info.size / 1024 / 1024
};
});
I found a solution. I uninstall "youtube-dl" and reinstalled it. This issue is related to a plugin update
Update
Since the youtube-dl binary is updated regularly, you can run npm run update to check for and download any updates for it. You can also require youtube-dl/lib/downloader in your app if you'd like to place youtube-dl binary in a specific directory and control when it gets updates.

How to run complex command in node js spawn?

I am developing a lib for docker command line in nodejs, I am still in starting face, I just tried basic docker run command using spawn in node js - everything works fine but it's not working for complex cases like the one below.
I want to run docker run --rm -it julia:0.3.6 julia -E "[x^2 for x in 1:100]" in nodejs, but I am gettting below error -
the input device is not a TTY
Docker Shell existed with status = 1
Below Code -
const
spawn = require('child_process').spawn,
dockerDeamon = spawn("docker", ["run","--rm", "-it", "julia:0.3.6", "-E", "\" [x^2 for x in 1:100]\""] );
dockerDeamon.stdout.on('data', data => {
console.log(`${data}`);
});
dockerDeamon.stderr.on('data', data => {
console.log(`${data}`);
});
dockerDeamon.on('close', code => {
console.log(`Docker Shell existed with status = ${code}`);
});
Is there any better way to execute the above script ?
You're passing the -t (--tty) flag to Docker, which tells it that it should expect the input and output to be attached to a terminal (TTY). However, when you're using spawn, you're instead attaching it to a Node.js stream in your program. Docker notices this and therefore gives the error Input device is not a TTY. Therefore, you shouldn't be using the -t flag in this case.
Also, note that you don't need nested quotes in your last argument, "\" [x^2 for x in 1:100]\"". The purpose of the quotes is to preserve the spaces and other special characters in the argument when running in a shell, but when you use spawn you're not using a shell.
So your statement should be something like:
dockerDeamon = spawn("docker", ["run","--rm", "-i", "julia:0.3.6", "julia", "-E", "[x^2 for x in 1:100]"] );

How can I get terminal size in a piped node.js process?

I'm using Grunt to kick off a unit-test framework (Intern), which ultimately pipes another node.js process that I'm then using Charm to output results to the screen. I'm having to pass in the terminal size information from a Grunt config option, but it's a bit messy and I'd like to try and get the terminal size from within the piped process, but the standard process.stdout.cols/getWindowSize are simply unavailable as the piped process doesn't register as TTY (although Charm works fine with it all).
Any suggestions?
EDIT Just to be clear here ... the Grunt JavaScript file is running in the main node.js process, but the file I'm attempting to retrieve this info from (and where I'm therefore running people's suggested commands) is in a spawned child process.
Try these:
tput cols tells you the number of columns.
tput lines tells you the number of rows.
echo -e "lines\ncols"|tput -S to get both the lines and cols
There's stty, from coreutils:
$ stty size #60 120 <= sample output
While running the below code in terminal prints the cols:
var sys = require('sys')
var exec = require('child_process').exec;
function puts(error, stdout, stderr) { sys.puts(stdout) }
exec("tput cols", puts);
The pty.js module can make a child act like a regular terminal.
var pty = require('pty.js');
var term = pty.spawn('bash', [], {
name: 'xterm-color',
cwd: process.env.HOME,
env: process.env
});
term.on('data', function(data) {
console.log(data);
});
term.write('ls\r');
term.resize(100, 40);
term.write('ls /\r');
console.log(term.process);

How to check whether chrome browser is installed or not using java script?

My requirement is I need to check whether Chrome browser is insatlled on the client machine or not using Javascript. I have searched on the net not able to find the way out.
Please help in getting this done.
You can't do that with JavaScript, and even if you could, you shouldn't.
JavaScript on the client doesn't have access to the user's system, for very good reasons. (Think, servers with bad intentions.)
You can check if the browser is Chrome with the next code
if(!window.chrome){
//Chrome code
}else{
// Chrome block
}
You can't. Not with JavaScript. However, you can check whether the browser that is currently being used to view your webpage is Google Chrome or not.
<script type="text/javascript">
if(window.chrome){
document.write("Browser is Chrome");
}
else{
document.write("Please download Chrome");
}
</script>
You can't get that kind of information directly from javascript.
What you can do is use that PowerShell command in a script and save the result in a file that you'll read later using javascript.
Get-ItemProperty HKLM:\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\* | Select-Object DisplayName, DisplayVersion, InstallLocation, Publisher, InstallDate | Format-Table -AutoSize
This will get you all the installed programs on the machine from the HKEY_LOCAL_MACHINE registry folder.
The exact path to the folder from wich the informations are retrieved is : HKLM:\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\
The given command will display you the application name followed by it's version, it's install location, publisher name and installation date in a PowerShell terminal.
If you want to output that list in a file simply add >FileName.txt after the command before pressing enter.
Note that by default the file will be created in the C:\Users\YourUserName\ folder so if you want the file to be created in a specific location you'll have to use the CD command to get to that specific location before executing the Get-Item-Property command.
This will get you done for the get installed programs on a machine part.
Now we can get into the check if app x is installed on the machine part.
First load the previously generated file in your js application you will use it's content to determine if an application is installed on the computer.
The faster way to get if 'chrome' is installed will be to load the file as a string and then do that basic stuff :
if (string.includes('chrome') == true) {
// chrome is installed on the machine
// you can do some more stuff
// like extracting it's path from the file content
} else {
console.log('error: chrome is not installed on this computer');
}
Needless to say that this will only work if used on the same computer from which you want to check the installed applications.
Edit: If you want a more practical file to use in javascript you can replace
Format-Table -AutoSize >FileName.txt
with :
Export-Csv -path .\FileName.txt -NoTypeInformation
this way you can split your file lines using the string.split(',') method and don't have to do some extra stuff to deal with the spaces between data.
Edit 2:
Here's a full working implementation that will let you retrieve informations from a PowerShell script directly from your javascript using NodeJs.
get_programs.ps1 (PowerShell script file) :
chcp 65001 # sets the encoding for displaying chars correctly
Get-ItemProperty HKLM:\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Uninstall\* | Select-Object DisplayName, DisplayVersion, InstallLocation | ConvertTo-Csv -NoTypeInformation
chcp 850 # restores the default encoding set this will avoid police changes due to the terminal modifications
Notice the change at the end of the command which is now:
| ConvertTo-Csv -NoTypeInformation
this allows to log data in the PowerShell terminal in the csv format which will simplify it's parsing as a string.
If you don't want to use another file to hold those few PowerShell
commands you can use this
child = spawn("powershell.exe",[`chcp 65001
Get-ItemProperty HKLM:\\Software\\Wow6432Node\\Microsoft\\Windows\\CurrentVersion\\Uninstall\\* | Select-Object DisplayName, DisplayVersion, InstallLocation | ConvertTo-Csv -NoTypeInformation
chcp 850`]);
as a replacement for
child = spawn("powershell.exe",["./get_programs.ps1"]);
If you choose to do this don't forget to escape the \ chars else it will not work.
app.js :
var spawn = require("child_process").spawn,child;
child = spawn("powershell.exe",["./get_programs.ps1"]); // here we start our PowerShell script "./" means that it's in the same directory as the .js file
let chromeDetails;
child.stdout.on("data", (data) => { // data event
// here we receive each outputed line in the PowerShell terminal as an Uint8Array
if (data.includes('Chrome')) { // check for the 'Chrome' string in data
chromeDetails = data.toString(); // adds data converted as string
}
});
child.stderr.on("data", (data) => { // logs errors
console.log(`Powershell Errors: ${data}`);
});
child.on("exit", () => { // exit event
console.log("Powershell Script finished");
if (chromeDetails != undefined) {
console.log(`> chrome has been detected on this computer
available informations (appName, version, installPath):
${chromeDetails}`);
} else
console.log('> chrome has not been detected on this computer');
});
child.stdin.end(); // we end the child
Expected output :
Powershell Script finished
> chrome has been detected on this computer
    available informations (appName, version, installPath):
    "Google Chrome","103.0.5060.114","C:\Program Files\Google\Chrome\Application"
If you are not on Windows you may want to take a look at Spawning .bat and .cmd files on Windows from the NodeJs documentation to get hints on how to adapt the above app.js code to work on your system.

Parsing of strings containing forward slash in node.js command line

Hi I am writing a node js app where I need to pass the path to some file via command line. I need to do this for configuration purposes. I understand that I can put all config details in a json file and then load it inside the app. But this is a specific requirement.
Here is my code
app.js
----
-----
console.log(process.argv);
---
--
// Start server
Now when I run this file in node as:
node app.js hii
Output
'hii'
But if I do
node app.js '/samplePath'
I get this output in DOS:
'\'/samplePath\''
I get this output in Git Bash:
'C:/Program Files/Git/samplePath'
How will I get just '/samplePath' as output? What am I doing wrong? Any help would be appreciated.
In order to get the last item, try
process.argv[2].split(/\//).pop();
You will have to parse the command line options your self. However you can look into this node module that will make this easy for you.
npm install commander
Here is an example from their Github page
var program = require('commander');
program
.version('0.0.1')
.option('-p, --peppers', 'Add peppers')
.option('-P, --pineapple', 'Add pineapple')
.option('-b, --bbq', 'Add bbq sauce')
.option('-c, --cheese [type]', 'Add the specified type of cheese [marble]', 'marble')
.parse(process.argv);

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