javascript - listen for input in a hidden input-field -

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is there way, on document ready / page load, 1 can listen more 3 characters being typed in row don't else, while nothing else focused, , if event occurs transfer 3 characters , else typed after input-field of type text / search hidden— either display, visibility, or opacity css properties ?

i appreciate in doing this.

i have done label , radio-button / check-box hidden. because input click on label. not complex alpha-numeric input.

if can me part of achieving above, appreciate it.

should straight forward:

var keys = [];  $(document).on('keypress', function(e) {     keys.push( string.fromcharcode(e.which) );     if (keys.length > 2)          $('input').fadein(400).val( keys.join('') ); });

fiddle


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