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java-script function condition not change when offline/online checking often electron js

onlineCheck.js
window.add = function () {
online = navigator.onLine ? console.log("online") : console.log("offline");
};
module.exports = {
add,
};
pos.js
const online= require("./onlineCheck");
online.add();
This my electron.js project . I need to if offline, getting console log. so I need it implement whole application and it should be working if working now any page. So I tried with like above code. I made separate js file for assign online check function. So I it imported to every other js files. It is not suitable and when application starts, Console logged . but , if I network given offline. then it is not console.log("offline"). I need to solve that issue..

How can an image be saved with JavaScript for Automator (JXA) in macOS Preview application?

There is an image open in the Preview application, and it is unsaved.
I have tried this code, by building and running a standalone script in Script Editor:
var preview = Application('Preview')
var preview.documents[0].close({ saving: true, savingIn: '/Volumes/USB Drive/Untitled-Image.png' })
I see this in the logs
app = Application("Preview")
app.documents.at(0).Symbol.toPrimitive()
--> Error -1700: Can't convert types.
app.documents.at(0).Symbol.toPrimitive()
--> Error -1700: Can't convert types.
However, I'm not sure I'm reading the docs correctly, and I'm not sure how to further debug this code. A satisfactory alternative here would be to send a keystroke to save and click the Save button.
What can I do to persist the image in Preview to a file?

One can declare paths speculatively in JavaScript using Path('...'), and then use the save command to save the image to the file that will be created at that path:
Preview = Application('com.apple.Preview');
ImageFilepath = Path('/Users/CK/Pictures/Preview_SavedImage.jpg');
Preview.documents[0].save({ in: ImageFilepath });

This code worked for me.
var preview = Application('Preview')
var photo = preview.documents[0]
photo.close({ saving: 'yes', savingIn: Path("/Path/To Some/file_name.png") })
Upon execution, in the Replies log of Script Editor window, something slightly different from the question sample is logged.
app = Application("Preview")
app.close(app.documents.at(0), {savingIn:Path("/Path/To Some/file_name.png"), saving:"yes"})
I was able to figure this out by studying the scripting dictionary for macOS Mojave 10.14 as well as the Release Notes for JXA; there is a similar example under Passing Event Modifiers section of that.
From the Script Editor scripting dictionaries, this is the entry for the close method in the Standard Suite:
close method : Close a document.
close specifier : the document(s) or window(s) to close.
[saving: "yes"/‌"no"/‌"ask"] : Should changes be saved before closing?
[savingIn: File] : The file in which to save the document, if so.
Note the key differences between the working code here and the code in the question:
Specify a Path object when passing the savingIn option to close.
Specify a the saving option as one of "yes", "no", or "ask" (not true).
If you're new to JXA, Automator, and/or Script Editor for Mac, checkout the JXA Cookbook.
If this answer helps you, you're probably having a bad time, so best of luck!

Google VR View for the Web

I'm trying to embed some 360 images on my site using Google VR View, but I'm having no luck getting anything to work. I'm following the Google provided documentation as a guide...
https://developers.google.com/vr/concepts/vrview-web
`window.addEventListener('load', onVrViewLoad)
function onVrViewLoad() {
var vrView = new VRView.Player('#vrview', {
image: 'img/jtree.jpg',
is_stereo: false
});
}`
I copied the example code, and am getting errors in the console (see attached screen shots)
Console Errors
Does anyone know of a tutorial that would better outline how to use this? Or possibly can someone shed some light on what I may be doing incorrectly?

You have to open your HTML file in a server.
Enable CORS https://enable-cors.org/server.html.
I find an easy way to enable CORS with the Chrome web server just for your experiment purpose.

I had absolutely no luck getting this to work with the instructions provided by Google - guess I'm not versed enough in coding. For me it only worked when I used the iframe, see https://www.museum-joanneum.at/spielwiese/360.
However, the view is still not exactly the same, the info-Tag is not layered over the image in the left lower corner like the demo on Google, but on top of the image and reduces the image height by about 30 pixels. Maybe that's related to the iframe since the instructions state, that the functionality isn't exactly the same as with the JavaScript API.
Also, for my images I had to select "false" for stereo in order to display correctly.
I hope this helps!

Looks like you are not setting up the directories properly. Is your web server set up so the root is the root of the repo? Are you also getting a 404 error? (looks like vrview.js is not being loaded)
As for places to get help with this, I recommend the vrview-web google group.

you need add this html id on web page.
<div id="vrview"></div>
Below JavaScript will call out the image on HTML.
var vrView;
var scenes = {
petra: {
image: 'images/petra.jpg',
preview: 'images/petra-preview.jpg'
}
}
function onLoad() {
vrView = new VRView.Player('#vrview', {
width: '100%',
height: 480,
image: 'images/blank.png',
is_stereo: false,
is_autopan_off: true
});
vrView.on('ready', onVRViewReady);
vrView.on('modechange', onModeChange);
vrView.on('getposition', onGetPosition);
vrView.on('error', onVRViewError);
}
function loadScene(id) {
console.log('loadScene', id);
// Set the image
vrView.setContent({
image: scenes[id].image,
preview: scenes[id].preview,
is_autopan_off: true
});
}
function onVRViewReady(e) {
console.log('onVRViewReady');
loadScene('petra');
}
function onModeChange(e) {
console.log('onModeChange', e.mode);
}
function onVRViewError(e) {
console.log('Error! %s', e.message);
}
function onGetPosition(e) {
console.log(e)
}
window.addEventListener('load', onLoad);

You can run those scripts only on the server and then only it will render the texture so you can add your all files in the wamp server path and access through or you can create a web project in asp.net, add your files and build the project. everything will be taken care of by the Visual Studio.
For example
download this sample Code
Add this in your wamp server path or create a project in visual
studio and add these files
Open your index.html file the in browser

Using native images in Cordova

I want to use custom images for tab bar icons, as set in this line using this extension: https://github.com/squerb/cordova-ios-tab-bar (imageName is passed through the extension from the javascript):
item = [[UITabBarItem alloc] initWithTitle:title image:[UIImage imageNamed: imageName] tag:tag];
I'm struggling to work out where I need to put the image in my Cordova project so that it's accessible by the native code. If indeed that's possible.
I've tried this:
item = [[UITabBarItem alloc] initWithTitle:title image:[UIImage imageNamed:#"www/assets/failed.png"] tag:tag];
But that results in this error:
2016-02-01 15:52:02.894 MovidiamWeb[2527:1070985] -[NSNull length]: unrecognized selector sent to instance 0x1a1e33ea8
2016-02-01 15:52:02.897 MovidiamWeb[2527:1070985] *** WebKit discarded an uncaught exception in the webView:decidePolicyForNavigationAction:request:frame:decisionListener: delegate: <NSInvalidArgumentException> -[NSNull length]: unrecognized selector sent to instance 0x1a1e33ea8

The second form, referencing a path that is visible in xcode project directory, in cordova's case, 'www/images/whatever.png' should work fine, just had to give it a few goes before it started working for some reason.

Create XPI package with the Add-on SDK?

I got task to write an add-on for Firefox which will add an div element to existing page. I downloaded Add-on SDK and wrote a main.js file that looks like this:
var data = require("sdk/self").data;
require("sdk/tabs").on("ready", ExecuteAd);
function ExecuteAd(tab) {
if ( tab.url.indexOf("some url checking") > -1 ) {
var image = "http://www.lavasoft.com/img/product_icons/aaw11/free.png";
var link = "http://www.google.me";
tab.attach({
contentScriptFile: data.url("myscript.js"),
contentScript: "appendFunc('"+image+"', '"+link+"');"
//contentScript: "alert('Works');"
});
}
}
When I execute command cfx run it starts Firefox and if I go to specific web pages this script works. But when I create XPI file with cfx xpi and then click on Firefox and open that file it installs my add-on but now when I go to same web pages I gave been before add-on does not work. I have this external Javascript file which is stored in folder 'data'.
appendFunc is in myscript.js file.
How to make my extension work in production environment not just testing environment? I think that main problem is that it does not find this data/myscript.js (does it include in .xpi file?)

Don't mix contentScript and contentScriptFile. Also, you cannot know what of both is loaded first.
Instead load your script, and communicate using port.
main.js
var data = require("sdk/self").data;
require("sdk/tabs").on("ready", ExecuteAd);
function ExecuteAd(tab) {
var image = "http://www.lavasoft.com/img/product_icons/aaw11/free.png";
var link = "http://www.google.me";
var worker = tab.attach({
contentScriptFile: data.url("myscript.js")
});
worker.port.emit("showAd", {image: image, link: link});
}
myscript.js
self.port.on("showAd", function(data) {
console.log("showing ad", data.link, data.image);
});
Also, it sounds like PageMod would be a better choice for what you're doing.
PS: Also consult the Add-on Policies if you're planning to host on the addons.mozilla.org website. The policies e.g. prohibit injecting ads that a) aren't clearly marked as such and b) where the user did not opt-in prior to that.