javascript - Prevent input cursor from going to end of input after value replace on keyup -


i'm using function found here formatting input. works, problem when adding text input, caret automatically goes end of input, , doesn't allow adding other place of input not end.

how can prevent cursor/cursor going end of input on keyup?

function format(input, format, sep) {     var output = "";     var idx = 0;     (var = 0; < format.length && idx < input.length; i++) {         output += input.substr(idx, format[i]);         if (idx + format[i] < input.length) output += sep;         idx += format[i];     }     output += input.substr(idx);     return output; }  $('.phoneinput').keypress( function(e){     var phonelength = $(this).val();     phonelength = phonelength.replace(/[^\d]/g,'').length;     if (phonelength == 10) {          e.preventdefault();     } });  $('.phoneinput').keyup(function(e) {     var phonenumber = $(this).val().replace(/-/g, "");     if (phonenumber.length <= 10) {         phonenumber = format(phonenumber, [2, 4], "-");     }     $(this).val(phonenumber); });


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