Filtering a list with an XML dataset in Spry 1.6.1?

Question

I have a typical XML data file.  I know how to load it, create a dataset, and then a master-detail display.
However, what I need to do is create form items that will FILTER the master set as the user clicks options.
For example, if the list is countries of the world, and the default is to show them all, there could be checkboxes and/or select menus that allow the user to choose countries only in Asia, or only monarchies, etc.
I can't find any examples of how to do this sort of thing.  Are there any?

Answer 1

That's very helpful, thanks.  What I am stuck on now is I am trying to "parameterize" my filter function, so I can pass the string to filter by from the checkbox to une function instead of having a filter function for each.
for example this works to find all items where the color is red:
var myFF = function(dataSet, row, rowNumber)
          if (row["color"].search('red') != -1)
                    return row;
          return null;
function ToggleFilter(enable, f)
          if (enable)
           ds1.addFilter(f, true);
          else
          ds1.removeFilter(f, true);
<label>Red: <input name="red1" type="checkbox" value="" onclick="ToggleFilter(this.checked, myFF);" /></label>
I would rather have the function be for ANY color, and specify the color on the checkbox, such as this:
<label>Red: <input name="red2" type="checkbox" value="" onclick="ToggleFilter(this.checked, myFF, 'red');" /></label>
So that I can easily have checkboxes 'red' 'green' etc.  However I must not be doing it right since if I modify the ToggleFilter function to expect the third parameter, and add the parameter to the ds1.addFilter(f, true) the whole thing fails.