How to perform an integer division, and separately get the remainder, in JavaScript?
For some number y and some divisor x compute the quotient (quotient) and remainder (remainder) as:
javascript
Go back button in a page
Here is the code
How to get the browser to navigate to URL in JavaScript
This works in all browsers: If you wanted to change the page without it reflecting in the browser back history, you can do:
JavaScript null check
An “undefined variable” is different from the value undefined. An undefined variable: A variable with the value undefined: When a function takes an argument, that argument is always declared even if its value is undefined, and so there won’t be any error. You are right about != null followed by !== undefined being useless, though.
Why is my Javascript not working?
It’s document.getElementById, not document.getElementbyId. (In JS, name of variables and functions are case-sensitive) Debugging tip : Look at the JS console (F12 in Google Chrome and IE9, Ctrl+Shift+K in Firefox). In this case, following error can be seen: It shows where the error happened (line 260 in your HTML/JS code) and what the error is(Object #<HTMLDocument> has no method getElementbyId).
Console logging for react?
If you’re just after console logging here’s what I’d do: Shouldn’t be any need for those packages just to do console logging.
JavaScript: Upload file
Pure JS You can use fetch optionally with await-try-catch Show code snippet Old school approach – xhr Show code snippet SUMMARY In server side you can read original file name (and other info) which is automatically included to request by browser in filename formData parameter. You do NOT need to set request header Content-Type to multipart/form-data – this will be set automatically by … Read more
What does this symbol mean in JavaScript?
See the documentation on MDN about expressions and operators and statements. Basic keywords and general expressions this keyword: How does the “this” keyword work? var x = function() vs. function x() — Function declaration syntax var functionName = function() {} vs function functionName() {} (function(){…})() — IIFE (Immediately Invoked Function Expression) What is the purpose?, How is it called? Why does (function(){…})(); work but function(){…}(); doesn’t? (function(){…})(); vs (function(){…}()); shorter alternatives: !function(){…}(); – What … Read more
Node.js – SyntaxError: Unexpected token import
Node 13+ Since Node 13, you can use either the .mjs extension, or set {“type”: “module”} in your package.json. You don’t need to use the –experimental-modules flag. Modules is now marked as stable in node.js Node 12 Since Node 12, you can use either the .mjs extension, or set “type”: “module” in your package.json. And you need to run node with the –experimental-modules flag. Node 9 In Node 9, it is enabled behind a flag, and … Read more
React this.setState is not a function
The callback is made in a different context. You need to bind to this in order to have access inside the callback: EDIT: Looks like you have to bind both the init and api calls: