4. How to use "require" in a module?

How to use "require" in a module?

  • M

    I’m trying to make my first module. A pretty simple one, I just want to display the IP address of my Raspberry Pi. (I’m not assigning it a static addr, so if it changes I’d like to know the new addr to remote into)

    A quick google turned up some code for querying for your local IP address. However, it’s not working. I’m getting “Uncaught ReferenceError: require is not defined”. Am I missing something silly here? (Yes, I know the actual ip-getting code is commented out, I’ll bring it back once I can get the reference to os working)

    Here’s the code:

    var os = require("os");
Module.register("my_ip", {

    // Default module config.
	defaults: {
	},

    // Override dom generator.
	getDom: function () {
	    var ip = location.host;

	    /*
	    var ifaces = os.networkInterfaces();

	    Object.keys(ifaces).forEach(function (ifname) {
	        var alias = 0;

	        ifaces[ifname].forEach(function (iface) {
	            if ('IPv4' !== iface.family || iface.internal !== false) {
	                // skip over internal (i.e. 127.0.0.1) and non-ipv4 addresses
	                return;
	            }

	            if (alias >= 1) {
	                // this single interface has multiple ipv4 addresses
	                console.log(ifname + ':' + alias, iface.address);
                    ip = iface.address;
	            } else {
	                // this interface has only one ipv4 adress
	                console.log(ifname, iface.address);
                    ip = iface.address;
	            }
	            ++alias;
	        });
	    });
        */

	    var wrapper = document.createElement("div");
	    wrapper.innerHTML = ip;
		return wrapper;
	},

});
    0

  • take a look into the documentation on how to write a module, especially the part with node_helper

    0
  • M

    Thanks! I’ve got it working with node_helper now. It seems a bit convoluted though, since my module now sends a socket notification to request the IP, and listens for the socket notification to refresh the local variable and redraw the DOM. Is this actually the correct way to do it?

    0
  • Moderator

    That’s how the node_helper method works, module sends a request, the node_helper.js script responds.

    0