Searching an html table after filtering rows

I have a table which i have filtered rows based on the criteria i have specified in a dropdownlist.
After I have applied the filter i would like to do a text based search. I found some javascript code that does a search but it also searches the rows that i have filtered or hid. I just want to search the rows that were not filtered. I greatly appreciate any help with this. See the below code that i am using for the search.

<script>
$(document).ready(function(){
$(“#myInput”).on(“keyup”, function() {
var value = $(this).val().toLowerCase();
$(“#myTable tr”).filter(function() {
$(this).toggle($(this).text().toLowerCase().indexOf(value) > -1)
});
});
});
</script>