A Final Word

In this column we enhanced your knowledge in two aspects. First, we provided you with a filters Demo Tool. You can play around with it and find how different parameter values affect the final outcome of the filtered object. You can also copy and paste the HTML code to your document and embed it in one of your pages. Moreover, we explained how to write such a tool. We showed you how to define hidden controls and how to copy them to the user's visible area upon demand. We went over the main function and gave you the commands we execute once we find the currently-selected filter. We detailed the procedure to extract all parameter settings. They are needed to build the command line which we evaluate and then use it to generate the HTML code.

In this column you have learned:

• How to define the hidden controls
• How to define the HTML elements of the tool
• How to write the main function
• How to assemble the HTML code for a filter
• How to initialize the tool

We also provided you with the tool's listing in both HTML and ZIP formats.