Eclipse IDE autocomplete for JavaScript and PHP

To enable autocomplete feature for language like JavaScript and PHP in your Eclipse project:

Locate and open .project file under Parent folder of your project within Eclipse IDE

Add two lines as below:

org.eclipse.wst.jsdt.core.jsNature
org.eclipse.php.core.PHPNature

Restart Eclipse IDE and you should see autocomplete suggestions while typing your code in *.js or *.php files.