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show a field and set focus to that field

Gary Samuels
Gary Samuels asked
Last Modified: 2015-03-02
I have several input text fields that are hidden.  When a button is clicked it calls:

function showlines(index) {
            $( "div.attwrapper" + index).toggleClass( "show-field", 500, "linear"  );
            document.getElementById( "div.attwrapper" + index).focus();

The document.getElementById was my attempt to set focus on the text field within the div.attwrapper .
It doesn't work, anyone know how I can set the focus on the text field?
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