javascript - Copy value of Radio Button Selectio to text box -


this question has answer here:

i trying copy value selected radio button display in text box. however, can not work. have copied code below.

is able me please?

function sync()  {    var n4 = document.getelementbyid('n4').checked;    var n1 = document.getelementbyid('n1');    n1.value = n4.value;  }
<form action="" id="n4"  onkeyup="sync()">    <input type="radio" name="gender" value="male" id"4" onkeyup="sync()"> male<br>    <input type="radio" name="gender" value="female" onkeyup="sync()"> female<br>    <input type="radio" name="gender" value="other" onkeyup="sync()"> other  </form>    <input type="text" name="n1" id="n1" >

i have changed bit of code. first of used onchange event. after ive created array of radio buttons same class name. everytime radio button changes loop , return checked value in input field. 

function sync() {    var radios = document.getelementsbyname('gender');    for(var = 0; < radios.length; i++){      if(radios[i].checked){        n1.value = radios[i].value;      };    };  };
<form action="" id="n4"  onkeyup="sync()">  <input type="radio" name="gender" value="male" id"4" onchange="sync()"> male<br>  <input type="radio" name="gender" value="female" onchange="sync()"> female<br>  <input type="radio" name="gender" value="other" onchange="sync()"> other  </form>      <input type="text" name="n1" id="n1" >


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