So I'm building a website where I can use buttons to activate various scripts. I want to be able to press a button on the website and have the script run on a raspberry pi (where the website is hosted). This has all worked fine up until I tried to have the PHP file activate a python script that could read/write to .json files. I don't think that there are any errors in either of the scripts because if I run the PHP script from the terminal whilst connected to the pi all the commands execute perfectly. However, when I call the PHP script in a browser nothing happens.
This is the contents of the PHP file:
<?php
system ( "gpio -g mode 24 out" );
system ( "gpio -g write 24 0" );
system ( "gpio -g mode 18 out" );
system ( "gpio -g write 18 1" );
system ( "sudo python3 RLY1on.py" );
?>
The contents of the python file are as follows:
import json
a = open("RelayState.json", "r")
data = json.load(a)
a.close()
data["RLY1"] = 1
a = open("RelayState.json", "w")
json.dump(data, a)
a.close()
As I said previously there weren't any errors whilst running this in the console so I'm not sure why it wouldn't run when called in a browser.
Any input would be much appreciated.
So on the off chance that anyone else gets this issue ill post what worked for me.
As I stated above there was no error in the paths or the code with the exception of the sudo used in the PHP program.
The PHP program wasn't run in sudo therefore running the python as sudo caused an error. This means that I had to change the permissions of the file I was trying to edit, I did this by using the following command:
chmod a+rw RelayState.json
This means that any user can edit the file with no permissions.
I am trying to run my node.js application from a script I have written:
echo "Starting node application"
sudo node /home/pi/PPBot/bot.js
exit 0
I run the script like this: sudo /etc/init.d/botscript
The output when running the script is:
Start node application
sudo: node: command not found
I have also tried replacing node by /home/pi/.nvm/versions/node/v.8.11.3/bin/node but this resulted in the same output.
I have already installed NodeJS through NVM. Simply using the command node bot.js works from the command line. However as can be seen above it does not work through the script.
if you want to run a simple node js file then use the command
-> node filename
ex.: node server.js
if you want to run a node js file with nodemon then use the command
-> nodemon filename
ex.: nodemon server.js
I am getting the following error:
XMLHttpRequest cannot load file:///C:/Users/richa.agiwal/Desktop/get/rm_Library/templates/template_viewSettings.html. Cross origin requests are only supported for HTTP.
I realize that this question has been answered before, but I still have not found a solution to my problem. I tried running chrome.exe --allow-file-access-from-files from the command prompt, and moved the file to the local file system, but I still get the same error.
I appreciate any suggestions!
If you are doing something like writing HTML and Javascript in a code editor on your personal computer, and testing the output in your browser, you will probably get error messages about Cross Origin Requests. Your browser will render HTML and run Javascript, jQuery, angularJs in your browser without needing a server set up. But many web browsers are programed to watch for cross site attacks, and will block requests. You don't want just anyone being able to read your hard drive from your web browser. You can create a fully functioning web page using Notepad++ that will run Javascript, and frameworks like jQuery and angularJs; and test everything just by using the Notepad++ menu item, RUN, LAUNCH IN FIREFOX. That's a nice, easy way to start creating a web page, but when you start creating anything more than layout, css and simple page navigation, you need a local server set up on your machine.
Here are some options that I use.
Test your web page locally on Firefox, then deploy to your host.
or: Run a local server
Test on Firefox, Deploy to Host
Firefox currently allows Cross Origin Requests from files served from your hard drive
Your web hosting site will allow requests to files in folders as configured by the manifest file
Run a Local Server
Run a server on your computer, like Apache or Python
Python isn't a server, but it will run a simple server
Run a Local Server with Python
Get your IP address:
On Windows: Open up the 'Command Prompt'. All Programs, Accessories, Command Prompt
I always run the Command Prompt as Administrator. Right click the Command Prompt menu item and look for Run As Administrator
Type the command: ipconfig and hit Enter.
Look for: IPv4 Address . . . . . . . . 12.123.123.00
There are websites that will also display your IP address
If you don't have Python, download and install it.
Using the 'Command Prompt' you must go to the folder where the files are that you want to serve as a webpage.
If you need to get back to the C:\ Root directory - type cd/
type cd Drive:\Folder\Folder\etc to get to the folder where your .Html file is (or php, etc)
Check the path. type: path at the command prompt. You must see the path to the folder where python is located. For example, if python is in C:\Python27, then you must see that address in the paths that are listed.
If the path to the Python directory is not in the path, you must set the path. type: help path and hit Enter. You will see help for path.
Type something like: path c:\python27 %path%
%path% keeps all your current paths. You don't want to wipe out all your current paths, just add a new path.
Create the new path FROM the folder where you want to serve the files.
Start the Python Server: Type: python -m SimpleHTTPServer port Where 'port' is the number of the port you want, for example python -m SimpleHTTPServer 1337
If you leave the port empty, it defaults to port 8000
If the Python server starts successfully, you will see a msg.
Run You Web Application Locally
Open a browser
In the address line type: http://your IP address:port
http://xxx.xxx.x.x:1337 or http://xx.xxx.xxx.xx:8000 for the default
If the server is working, you will see a list of your files in the browser
Click the file you want to serve, and it should display.
More advanced solutions
Install a code editor, web server, and other services that are integrated.
You can install Apache, PHP, Python, SQL, Debuggers etc. all separately on your machine, and then spend lots of time trying to figure out how to make them all work together, or look for a solution that combines all those things.
I like using XAMPP with NetBeans IDE. You can also install WAMP which provides a User Interface for managing and integrating Apache and other services.
Simple Solution
If you are working with pure html/js/css files.
Install this small server(link) app in chrome. Open the app and point the file location to your project directory.
Goto the url shown in the app.
Edit: Smarter solution using Gulp
Step 1: To install Gulp. Run following command in your terminal.
npm install gulp-cli -g
npm install gulp -D
Step 2: Inside your project directory create a file named gulpfile.js. Copy the following content inside it.
var gulp = require('gulp');
var bs = require('browser-sync').create();
gulp.task('serve', [], () => {
bs.init({
server: {
baseDir: "./",
},
port: 5000,
reloadOnRestart: true,
browser: "google chrome"
});
gulp.watch('./**/*', ['', bs.reload]);
});
Step 3: Install browser sync gulp plugin. Inside the same directory where gulpfile.js is present, run the following command
npm install browser-sync gulp --save-dev
Step 4: Start the server. Inside the same directory where gulpfile.js is present, run the following command
gulp serve
To add to Alan Wells's elaborate answer here is a quick fix
Run a Local Server
you can serve any folder in your computer with Serve
First, navigate using the command line into the folder you'd like to serve.
Then
npx i -g serve
serve
or if you'd like to test Serve without downloading it
npx serve
and that's it! You can view your files at http://localhost:5000
If you are using vscode, you can easily start a liver server. Click liver server at the bottom of the page, once the server is started, vscode will tell the port the project is running. Do ensure your project folder is the workspace
This error is happening because you are just opening html documents directly from the browser. To fix this you will need to serve your code from a webserver and access it on localhost. If you have Apache setup, use it to serve your files. Some IDE's have built in web servers, like JetBrains IDE's, Eclipse...
If you have Node.Js setup then you can use http-server. Just run npm install http-server -g and you will be able to use it in terminal like http-server C:\location\to\app.
Kirill Fuchs
If you use the WebStorm Javascript IDE, you can just open your project from WebStorm in your browser. WebStorm will automatically start a server and you won't get any of these errors anymore, because you are now accessing the files with the allowed/supported protocols (HTTP).
I was facing this error while I deployed my Web API project locally and I was calling API project only with this URL given below:
localhost//myAPIProject
Since the error message says it is not http:// then I changed the URL and put a prefix http as given below and the error was gone.
http://localhost//myAPIProject
Depends on your needs, but there is also a quick way to temporarily check your (dummy) JSON by saving your JSON on http://myjson.com. Copy the api link and paste that into your javascript code. Viola! When you want to deploy the codes, you must not forget to change that url in your codes!
I have ubuntu 16.04 and I installed Geany using Ubuntu Software Centre. I need to edit some php and js files which happen to be in root directories. So when I try to save the changes in Geany, it generates following error:
Error opening file '/var/www/html/project1/team/team.php': Permission denied
The file on disk may now be truncated!
How can I make Geany to edit and save these files?
try
gksudo geany
Use gksudo with graphical apps written in GTK+ instead of sudo
sudo -Eb geany
worked for me on Debian 10 with xrdp. I executed the command on xrdp desktop Terminal Emulator.
-E: preserve user environment when running command
-b: run command in the background
Note that without -b option the control will not return to terminal until geany is closed.
Not an expert on this, was just trying to see sudo's options and this did the trick!
sudo geany
but you really shouldn't edit your code in production environment
if you are developing locally navigate to your www file using terminal
after that you have to change the permission to 777 using this command
sudo chmod 777 html
which mean every one can read-write-execute your files
REMEMBER THIS IS FOR LOCALLY DEVELOPING
I am new to bender.js and I am trying to run the example project at:
https://github.com/benderjs/benderjs-example-project
After going through the installation steps,
I am unable to access bender.js server at:
http://localhost:1030
I have installed bender.js and all the dependencies stated in the example project.
This was due to executing the ".js" from the command prompt. As it turns out, Windows executes ".js" files with WSH or the default program(notepad in my case) associated with the file extension.
Executing the same script from a PowerShell or Git Shell or any other UNIX based shells should solve the issue.