Is there a way to check if timezone name valid or not in JavaScript without using external library? When user enters timezone name in text field I want to verify whether zone is valid or not? I know we can do it easily using moment-timezone library. But I don’t want to use any extra library. I’m l…
Tag: javascript
Copy value of local variable to a global variable in JavaScript
I am trying to update the value of a global variable based on the local variable which is defined inside a function. I read here on Stack Overflow to use the window object, but still it’s not working. Here is the JSFiddle – https://jsfiddle.net/t18ofd65/8/ Answer You are fundamentally misunderstan…
When to mark function as async
Basically, function must be prefixed with async keyword if await used inside it. But if some function just returns Promise and doesn’t awaiting for anything, should I mark the function as async? Seems like both correct or not? Answer if some function just returns Promise and doesn’t awaiting for a…
Call method from component inside component’s
I’m learning Vue.js and I’m struggling to find a way to organize my code. I’m trying to make everything as modular as possible, so when making a slider i did the following: And in my view I simply use the component: But after I try to call echo, it looks for it in the parent scope, not in th…
Updating nested object by path in javascript
Let’s say I have this object: I’d like to be able to update the price in this object through a function call as follows: This answer Javascript: how to dynamically create nested objects using object names given by an array is good but does not address the case when there are arrays in the object. …
PHP music play/pause button
Hi, i am working on a project where i have a music button which is used to start/play and stop/pause the background music. PROBLEM: Problem is that i have many pages in my website when i press the music stop/pause button the music stops playing but when i navigate to different pages the music starts automatic…
How can I extend an interface and override a property’s type?
I have a pretty complicated object with multiple properties that I’d like to extend and override a specific property. Essentially, objects with the type ComplicatedObject are converted to the MoreComplicatedType by assigning a string value to propertyTwo. I’d like to avoid using a union type on pr…
Trace a Webpack Error/Line Back to its Source Line
Often, if I’m using webpack to compile/transpile code from ES2015 syntax to something my web browser can read (in a single bundle.js file) I’ll end up with an error like this The specific error here isn’t important — what’s important is that Chrome points me towards line 99 of bu…
Increment and Decrement price value on Change
i’m trying to do an price counter synchronizing with increment and decrement buttons, but the price is not changing when i click one of the buttons (+/-) this is not working, how can i solve this issue? Thanks!!! Answer If you change your binding to update whenever there is a click on an input, you̵…
How to get a File() or Blob() from an URL in javascript?
I try to upload an image to the Firebase storage from an URL (with ref().put(file))(www.example.com/img.jpg). To do so i need a File or Blob, but whenever I try new File(url) it says “not enough arguments“… EDIT: And I actually want to upload a whole directory of files, that’s why i can’t upload them vi…