The applet-based versions of the cfgrid, cfslider, and cftree forms use JavaScript and Java to display their content. To allow them to display consistently across a variety of browsers, these applets use the Java plug-in. As a result, they are independent of the level of Java support provided by the browser.

ColdFusion downloads and installs the browser plug-in if necessary. Some browsers display a single permission dialog box asking you to confirm the plug-in installation. Other browsers, particularly older versions of Netscape, require you to navigate some simple option windows.

Because the controls use JavaScript to return data to ColdFusion, if you disable JavaScript in your browser, it cannot properly run forms that contain these controls. In that case, the controls still display, but data return and validation does not work and you can receive a JavaScript error.

Because Java is handled by the plug-in and not directly by the browser, disabling Java execution in the browser does not affect the operation of the controls. If for some other reason, however, the browser is unable to render the controls as requested, a "not supported" message appears in place of the control.

You can use the cfform tag's notsupported attribute to specify an alternative error message.

You can avoid browser Java and JavaScript issues with the cfgrid and cftree controls by using the Flash format versions of these controls. These controls work on Windows, Mac OS X, and Linux, and do not rely on Java support. There is no Flash format version of the cfslider control, and there is no applet format version of the cfcalendar control.