Troubleshooting JavaScript

JavaScript is a wonderful tool to use to create interesting and interactive Web pages, but every once in a while nothing works and you have no idea where to start to get things moving again. Not to worry; take a look at the following list for hints on what to do to get back on track (try them in this order):

• Is your Web browser installed and configured correctly, including your communications stuff?

  
  



• Is JavaScript enabled?

  
  

  From Navigator: Choose Edit→Preferences→Advanced→Scripts & Plugins and select the Enable JavaScript For Navigator check box.

  
  

  From Internet Explorer:

  
  
  
  

  • Choose Tools→Internet Options and click the Security tab

    
    
  
  

  • Click the Custom Level button

    
    
  
  

  • Scroll down until the Scripting category appears

    
    
  
  

  • Select the Enable radio button for these options: Active Scripting; Allow Paste Operations Via Script; and Scripting of Java Applets

    
    
  
  
  
  



• Are all your JavaScript statements between <SCRIPT> and </SCRIPT> tags (except JavaScript statements attached to event handlers, which don't have to be)?

  
  



• Does your HTML file work as it should by itself if you delete your JavaScript statements?

  
  



• Do the names of your JavaScript variables all start with an alphabetic character (or an underscore)?

  
  

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Source:http://www.dummies.com/how-to/content/troubleshooting-javascript.navId-405067.html