Ability to have custom txt input field

[pratikt]

I have added code to have an option to attach a custom text box as the filter input field. This is very important to place the text box anywhere to suit the design.

[sunnywalker]

I've taken your idea and implemented it in spirit. Rather than an id, you pass a selector (in case you want to use a class or other type of selector). It also handles the missing element case I mentioned above and accounts for the selector returning too many elements. Thank you for your help!