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What is Javascript?

JavaScript is a dynamic computer programming language. It is lightweight and most commonly used as a part of web pages, whose implementations allow client-side script to interact with the user and make dynamic pages. It is an interpreted programming language with object-oriented capabilities.
JavaScript is the Programming Language for the Web.
JavaScript can update and change both HTML and CSS.
JavaScript can calculate, manipulate and validate data.

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Questions (109)

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Javascript - Chart.js - Display a reference area in which the value should be?

you can do this by using Chart.js's annotation feature. var ctx = document.getElementById('myChart').getContext('2d'); var myChart = new Chart(ctx, { type: 'line', data: { labels: ['1'...

Tags: Javascript, chart.js

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Javascript - Getting an error if arrow function returns a function but not when it returns null for useEffect?

The problem is that by changing to the shorthand form, you've implicitly added a return. Your shorthand version isn't the same as your version with {}; instead, it's equivalent to this: useEffect(() =...

Tags: Javascript, Reactjs, react-hooks

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Javascript - D3 update graph after data changes?

In your second .selectAll you are selecting by class name but never assign that class. This means your selection will be empty and all the data will be "entering" again. Easy fix:...

Tags: Javascript, d3.js

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Javascript - How can I add an onBlur event to a selectizeInput?

It works normally for the textInput For the selectizeInput, you have to use the onBlur option: selectizeInput( "si", label="letters", choices = letters, options = list( onBlur = I('fun...

Tags: Javascript, r, shiny

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Making a piano simulator and the javascript will not execute or display in console?

Your selector is not quite right. You have "piano-keys .key". You need ".piano-keys .key"

Tags: Javascript

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Javascript - Algorithm to distribute variably-sized items into balanced groups preserving items order?

The algo is the following: Spread item indices by size Make equal chunks of indices of the required group count Compare edges of the chunks and cut smaller index count on edges of siblings chunks Pro...

Tags: Javascript, algorithm, math

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Javascript - Firebase is saying that the ID doesn not match?

I'm not entirely sure why you expect this system to work, but you seem to be missing one important detail: The Firebase Admin SDK can only verify user tokens for user accounts created by Firebase Auth...

Tags: Javascript, node.js, firebase

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Javascript - How do I host NodeJS API service on GitHub Pages?

Sadly, you can't host a backend (express) server on GitHub pages. Github Pages is used for hosting static websites -- just frontend, no db, no backend. I would recommend you look at glitch.com and v...

Tags: Javascript, node.js, github-actions

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Javascript - Add an event listener to the first button that changes the text within the <h1> to EITHER uppercase or all lowercase?

So first off, you'll want a variable, isUpperCase, that will remember if the text is uppercase or lowercase. This variable will change with each click of the button so it cannot be declared as a const...

Tags: Javascript, function, button

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Javascript - Approach to getting font glyph data to display in the UI?

The properties you're searching for are stored globally and not in the glyphs' data (e.g in the os2 table). Here's an example using opentype.js: let fontSrc = "https://fonts.gstatic.com/s/roboto...

Tags: Javascript, fonts

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