jQuery / Ajax search by particular field

I have it all setup and working fine - what id like to do is have it only search by one particular field in a table (td with class of test).

Im using $('input#SearchBox').quicksearch('table#tablesorter-demo tbody tr');

which searches all the fields in the table, I have tried:

$('input#SearchBox').quicksearch('开发者_开发百科table#tablesorter-demo tbody tr td.test');

but this just stops the whole search from working, ideas appreciated?

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Try this:

$('input#SearchBox').quicksearch('table#tablesorter-demo tbody tr', {'selector': 'td.test'})

Working JSFiddle Example

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Try being less specific in your criteria:

$('input#SearchBox').quicksearch('.test');