ButtonBar

The applet gets almost all of the information via parameters. The parameters have to be set in the HTML Code, as part of the <applet> tag (To see how to create the HTML code read the HTML code page).

• To use the parameters which specify colors you will need to know how to define colors.
• Important info about defining image/audio clip locations and URLs.

(Parameters marked with a * are required)
 
 

How to define colors:

Generally, there are two ways to define a color:

1. HTML-like: In HTML a color is defined by three hexadecimal numbers between 0 and 255. These numbers represent the RGB values, that is the red, green and blue shares of the color. By defining the RGB values you can mix any color you like. For example, to get a red color like this one you had to define the shares like this: Red = 255, Green = 0, Blue = 0. In hexadecimal numbers this would be: Red = FF, Green = 0, Blue = 0. Thus, to define the color red in HTML you would write "ff0000" (it doesn't matter whether you write the letters upper- or lowercase). Many image processing applications have a feature to convert colors to hexadecimal RGB values. If you do not have such an application yet you might wish to visit www.jasc.com and download the shareware version of "Paint Shop Pro".
2. Shortcuts: I built in shortcuts for some of the most common colors. The shortcuts are:
• black (is also default)
• blue
• cyan
• darkgray
• gray
• green
• lightgray
• magenta
• orange
• pink
• red
• white
• yellow

You can specify URLs in two ways: either you give the applet just a filename or you specify an entire URL. If you use just a filename with no path information, the applet will automatically add the path of the HTML document to create a complete URL.

Example:

If one of your "DestURL#" parameters links to: "buttonbar_mainframe.html", the applet will automatically add the document's path to this. The complete URL (which the applet will use to call the document) will be:

http://welcome.to/javaforall/buttonbar_mainframe.html

(assuming that "http://welcome.to/javaforall" is the URL where the HTML document is residing).

You can also link to pages which are stored in subdirectories. A link to a page which is in a subdirectory called "html_documents" would look like this:

html_documents/buttonbar_mainframe.html

(of course the applet will add the path of the HTML document to this, as it is not a complete URL).

Image locations are different. You cannot use a complete URL to define an image location. The applet will always add the URL of the HTML document into which the applet is embedded to the location. But of course you can also use subdirectories.

Back to ButtonBar

How to Add Java Applets to Your Site

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