javascript - Activate function once 12 characters are entered into text box -


i new mvc 4 , making internet application uses hand scanner fill text box. hoping have automatically activate javascript function once barcode has been scanned.

scanning barcode fills active textbox 12 characters, , have click button after each scan. there way automatically activate button or javascript function after barcode scanned, or after 12th character entered?

$('#mytextbox').attr('maxlength','12'); $(document).on('change','#mytextbox',function(e) {     if ($(this).val().length >= 12) {         $('#mybutton').click();     } }); 

or, if scanner routine supports keyboard events:

$('#mytextbox').attr('maxlength','12'); $(document).on('keyup','#mytextbox',function(e) {     if ($(this).val().length >= 12) {         $('#mybutton').click();     } }); 

either way, solution requires jquery, javascript library.


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