Max-Length for multiple text areas using php and Javascript -

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i trying display number of characters left in multiple text areas. although have different id's text areas, max length prompted 2nd text area , not first. code shown below

<textarea id="txtbox"></textarea>      <input type="text" id="counterbox"/>         <script>             var txtboxref = document.queryselector("#txtbox");             var counterref = document.queryselector("#counterbox");             txtboxref.addeventlistener("keydown",function(){             var remlength = 0;             remlength = 160 - parseint(txtboxref.value.length);             if(remlength < 0)             {                 txtboxref.value = txtboxref.value.substring(0, 160);                 return false;             }             counterref.value = remlength + " characters remaining...";             },true);         </script>  <textarea id="txtbox1"></textarea>      <input type="text" id="counterbox1"/>             <script>                 var txtboxref = document.queryselector("#txtbox1");                 var counterref = document.queryselector("#counterbox1");                 txtboxref.addeventlistener("keydown",function(){                 var remlength = 0;                 remlength = 160 - parseint(txtboxref.value.length);                 if(remlength < 0)                 {                 txtboxref.value = txtboxref.value.substring(0, 160);                 return false;                 }                 counterref.value = remlength + " characters remaining...";                 },true);             </script>

the result below (what have):

enter image description here

what want :

enter image description here

looks variables txtboxref , counterref in same scope area, declared twice.

<textarea id="txtbox"></textarea>       <input type="text" id="counterbox"/>          <script>              var txtboxref = document.queryselector("#txtbox");              var counterref = document.queryselector("#counterbox");              txtboxref.addeventlistener("keydown",function(){              var remlength = 0;              remlength = 160 - parseint(txtboxref.value.length);              if(remlength < 0)              {                  txtboxref.value = txtboxref.value.substring(0, 160);                  return false;              }              counterref.value = remlength + " characters remaining...";              },true);          </script>    <textarea id="txtbox1"></textarea>       <input type="text" id="counterbox1"/>              <script>                  var txtboxref1 = document.queryselector("#txtbox1");                  var counterref1 = document.queryselector("#counterbox1");                  txtboxref1.addeventlistener("keydown",function(){                  var remlength = 0;                  remlength = 160 - parseint(txtboxref1.value.length);                  if(remlength < 0)                  {                  txtboxref1.value = txtboxref1.value.substring(0, 160);                  return false;                  }                  counterref1.value = remlength + " characters remaining...";                  },true);              </script>

check fiddle


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