Troubleshooting JavaScript

JavaScript is a programming language that is mostly used in web pages, usually to add features that make the web page more interactive. JavaScript is required to submit information to PhET.

JavaScript is completely different than Sun Microsystems' Java Web Start that we use on our simulations. For assistance with Sun Microsystems' Java, go here.

If you can't solve your problem here, please notify us by email at the following address: phethelp@colorado.edu

FAQ's

Is JavaScript enabled on by browser?

Why is JavaScript needed?

JavaScript is used with many features on the website, including filtering routines and allowing for multiple inputs of data. Howevery, many pages will work fine without JavaScript enabled.

How do I enable JavaScript on Firefox?

1. Go to the "Edit" menu and select "Preferences"
2. Select the "Content" tab at the top of the Preferences window
3. Make sure the "Enable JavaScript" checkbox is checked
4. Reload this page, and see question 1

How do I enable JavaScript on Internet Explorer?

1. Go to the Tools menu and select Internet Options...
2. Select the Security tab
3. Select on the Custom Level... button
4. Scroll down until you see Active Scripting under the Scripting heading
5. Make sure that it is set to Enabled
6. You may be asked if you are sure you want change the security settings for this zone. You will want to select the Yes button
7. Select the OK button on the original Internet Options window
8. Reload the page (you can check if it worked by reading this question)

How do I enable JavaScript on Safari?

1. Select Preferences from the Safari menu.
2. Click Security.
3. Check Enable JavaScript.
4. Close the window.
5. Click Reload.