There are browser extensions for Chrome and Firefox which can disable JavaScript by default but make it easy to turn it on only for trusted websites. There are an increasing number of security minded people who do not just let JavaScript run on every single page they visit to decrease the chances of these attacks. JavaScript based attacks such as Cross Site Scripting and Click Jacking rely on JavaScript and can cause your security to be compromised. There is an increasing number of ways for JavaScript to be used maliciously. Security considerationsĪs with most things, there is a flip side to JavaScript. It's also used for Cookie detection, Flash version detection, Java version detection and so on. In fact, JavaScript was used to create the JavaScript detection on this page! If JavaScript is enabled then it updates the default "No" answer in to a "Yes" answer! (so that if JavaScript is not enabled, the default "No" remains as the answer). So for example, when you're using Facebook and you see a new notification come through you can know that JavaScript was used to do that! JavaScript can also be used to dynamically update part of a page without needing to reload the entire page.
Once that field is fixed then the form will be allowed to be submitted. If the code notices that you've forgotten to enter something in one of the fields (For example, your email address) it would pop up a warning and not let you submit the form until it is complete. So that when you try to submit a form the code runs and looks at each field on the form. Instead of a webpage just being a plain page that has no interactivity, JavaScript can allow webpages adapt to what you do on the page, load new information, make decisions and respond to events.įor example, JavaScript might be used to validate a Mailing List Subscription form. Generally speaking, it is used to allow Website developers to create web pages that have some intelligence built in to them. There are many, many things that it can be used for. JavaScript is a multipurpose programming language.
Lets cover the basics about what JavaScript is and what it can do for you.
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