Javascript Email Validation
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Why websites use javascript validation
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Many websites have input boxes where people visiting the site can input information. This is especially useful for sites that ask users to sign up and create an account, but these types of forms are useful for many different purposes, including allowing a user to send the administrator a message. This information is then sent to a program that tracks information about user traffic. This may be a script within your website, a PHP engine, or some other piece of technology, such as an Oracle database. Unfortunately, many users do not carefully check what they enter into these boxes. If information like an email address is not entered properly, it can cause errors for your software and also make it difficult respond to a visitor's query.
How Javascript email validation works
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One advantage of Javascript email validation is that it works almost instantaneously. When a website visitor enters in their email information and hits the submit button, the script goes through and checks each aspect of the email address. In general, this means that the script will make sure that the domain is in a valid format and that the name itself is properly formatted. If the script detects anything amiss, it will send back a warning to the visitor letting them know that something appears to be wrong.
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Obtaining and installing the script
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One of the advantages of Javascript is that it can be easily implanted in a webpage. Because most websites use Javascript, almost all browsers are equipped to read them, which means that any email validation program you put in should work for most users. These scripts are also freely available from various websites, many of which are listed in the resources for this article.
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