Validate E-Mail Addresses Using JavaScript

Using a text box and submit button, you can validate an e-mail address to make sure there is only one @ sign and that it is not at the beginning or end of the address. Also, you can check to ensure there is at least one period in the address and any periods are not at the beginning or end of the address. To do the validation, all you’ll need is the JavaScript String.indexOf() function. This searches a string and returns the first instance of a substring. Using indexOf() you can search either from the beginning or a specific starting point. This code also makes sure that the required period is after the required @ sign. Finally, you can give appropriate alert responses to whether the requirements have been met.

 
Your e-mail address:
Share the Post:
Share on facebook
Share on twitter
Share on linkedin

Overview

The Latest

microsoft careers

Top Careers at Microsoft

Microsoft has gained its position as one of the top companies in the world, and Microsoft careers are flourishing. This multinational company is efficiently developing popular software and computers with other consumer electronics. It is a dream come true for so many people to acquire a high paid, high-prestige job

your company's audio

4 Areas of Your Company Where Your Audio Really Matters

Your company probably relies on audio more than you realize. Whether you’re creating a spoken text message to a colleague or giving a speech, you want your audio to shine. Otherwise, you could cause avoidable friction points and potentially hurt your brand reputation. For example, let’s say you create a

chrome os developer mode

How to Turn on Chrome OS Developer Mode

Google’s Chrome OS is a popular operating system that is widely used on Chromebooks and other devices. While it is designed to be simple and user-friendly, there are times when users may want to access additional features and functionality. One way to do this is by turning on Chrome OS