![]() ![]() Most often, the purpose of data validation is to ensure correct user input. has the user entered text in a numeric field?. ![]() has the user filled in all required fields?.JS References JavaScript Objects HTML DOM ObjectsĪutomatic HTML form validation does not work in Internet Explorer 9 or earlier.ĭata validation is the process of ensuring that user input is clean, JS Examples JS Examples JS HTML DOM JS HTML Input JS HTML Objects JS HTML Events JS Browser JS Editor JS Exercises JS Quiz JS Bootcamp JS Certificate JS Graphics JS Graphics JS Canvas JS Plotly JS Chart.js JS Google Chart JS D3.js JS vs jQuery jQuery Selectors jQuery HTML jQuery CSS jQuery DOM JS JSON JSON Intro JSON Syntax JSON vs XML JSON Data Types JSON Parse JSON Stringify JSON Objects JSON Arrays JSON Server JSON PHP JSON HTML JSON JSONP JS AJAX AJAX Intro AJAX XMLHttp AJAX Request AJAX Response AJAX XML File AJAX PHP AJAX ASP AJAX Database AJAX Applications AJAX Examples JS Web APIs Web API Intro Web Forms API Web History API Web Storage API Web Worker API Web Fetch API Web Geolocation API JS Browser BOM JS Window JS Screen JS Location JS History JS Navigator JS Popup Alert JS Timing JS Cookies JS HTML DOM DOM Intro DOM Methods DOM Document DOM Elements DOM HTML DOM Forms DOM CSS DOM Animations DOM Events DOM Event Listener DOM Navigation DOM Nodes DOM Collections DOM Node Lists JS Async JS Callbacks JS Asynchronous JS Promises JS Async/Await ![]() JS Classes Class Intro Class Inheritance Class Static JS Functions Function Definitions Function Parameters Function Invocation Function Call Function Apply Function Bind Function Closures JS Objects Object Definitions Object Properties Object Methods Object Display Object Accessors Object Constructors Object Prototypes Object Iterables Object Sets Object Maps Object Reference Sign up for my newsletter if you want more articles to help you become a better frontend developer.JS Tutorial JS HOME JS Introduction JS Where To JS Output JS Statements JS Syntax JS Comments JS Variables JS Let JS Const JS Operators JS Arithmetic JS Assignment JS Data Types JS Functions JS Objects JS Events JS Strings JS String Methods JS String Search JS String Templates JS Numbers JS BigInt JS Number Methods JS Number Properties JS Arrays JS Array Methods JS Array Sort JS Array Iteration JS Array Const JS Dates JS Date Formats JS Date Get Methods JS Date Set Methods JS Math JS Random JS Booleans JS Comparisons JS If Else JS Switch JS Loop For JS Loop For In JS Loop For Of JS Loop While JS Break JS Iterables JS Sets JS Maps JS Typeof JS Type Conversion JS Bitwise JS RegExp JS Precedence JS Errors JS Scope JS Hoisting JS Strict Mode JS this Keyword JS Arrow Function JS Classes JS Modules JS JSON JS Debugging JS Style Guide JS Best Practices JS Mistakes JS Performance JS Reserved Words This article was originally posted at my blog. Did this article help you out? If it did, I hope you consider sharing it. See the Pen Empty validation with JavaScript by Zell Liew ( on CodePen. const input = document.querySelector('input')input.addEventListener('input', evt => ) If you want to validate the input when a user types into the field, you can use the input event. Here’s what we’re building: Events to validate the input Today, let’s talk about the same thing, but with JavaScript. Last week, I shared how to check if an input is empty with CSS. By Zell Liew How to check if an input is empty with JavaScript ![]()
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