Cannot read property 'getContext' of null, using canvas?

I get the error Uncaught TypeError: Cannot read property 'getContext' of null and the important parts in files are.....

HTML5 Canvas + JavaScript wireframe sphere transformation issue?

I have written some JS code to plot a 3D wireframe sphere into a HTML5 canvas. I started from this post and improve...

Get selected value in dropdown list using JavaScript?

How do I get the selected value from a dropdown list using JavaScript? I tried the methods below, but they all retur...

Cannot draw italic text in Firefox canvas?

When drawing italicized text in canvas, Firefox would render them as normal for fonts like Impact. var ctx = canvas...

Checking if jquery is loaded using Javascript?

I am attempting to check if my Jquery Library is loaded onto my HTML page. I am checking to see if it works, but so...

How do I test for an empty JavaScript object??

After an AJAX request, sometimes my application may return an empty object, like: var a = {}; How can I check whe...

JS - How to create minecraft-style clouds??

I'm currently developing a kind of block game (compare Minecraft) for the browser and am teaching three.js. I want ...

command not found: jest?

I have a test file like so: (I am using create-react-app) import React from 'react'; import ReactDOM from 'react-do...

What does 0x0F mean? And what does this code mean??

I have this code. Please make me understand what does this code actually mean for(var i = 0; i < input.length;...

Why “i” is not equals to “i̇”??

In the javascript console of google chrome type the following code: "i" == "i̇" and realize that it returns fals...

Is SAJAX dead? What to replace with??

We use Sajax for adding small Ajax code to sites. After running into a problem and doing some digging, it seems the...

How to use nav.popTo() (ionic 2)??

I'm using NavController. To go back I can use nav.pop(), but how to use nav.popTo() if I need go to the other page (...

HTML Failed parsing 'srcset' attribute value since it has an unknown descriptor on images - React - Webpack?

Might be worth mentioning that I am using React and Webpack. Example of this: <img src="https://increasify.com....