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Editorial Team
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Asked: 2026-06-18T00:23:06+00:00

My JavaScript: <script type=text/javascript> function getVal(chk, adto) { var ad=; if (chk.checked) { ad=document.getElementById(adto).value

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My JavaScript:

<script type="text/javascript">
function getVal(chk, adto)
{
  var ad="";
  if (chk.checked) 
  {
    ad=document.getElementById(adto).value + chk.value;
    document.getElementById(adto).value = ad;
  }
  else  
  {
  }
}
</script>

The first block is working as I wanted but when user unchecked the check box it should remove the value from the text box.

Below is the HTML code:

<body>
<input type="checkbox" name="chk[]" value="0" id="chk0" onclick="getVal(this, 'inp0')">value 0<br>
<input type="checkbox" name="chk[]" value="1" id="chk1" onclick="getVal(this, 'inp0')">value 1<br>
<input type="checkbox" name="chk[]" value="2" id="chk2" onclick="getVal(this, 'inp0')">value 2<br>
<input type="checkbox" name="chk[]" value="3" id="chk3" onclick="getVal(this, 'inp0')">value 3<br>
<input type="checkbox" name="chk[]" value="4" id="chk4" onclick="getVal(this, 'inp0')">value 4<br>
<input type="checkbox" name="chk[]" value="5" id="chk5" onclick="getVal(this, 'inp0')">value 5<br>
<br>
<input type="text" name="inp" id="inp0" readonly><br>

Please help how to remove the unchecked options from the text box.

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1 Answer

  1. Editorial Team

    DEMO

    Assuming all checkboxes with the same name adds to the same field.
    If not we will need more code.

    I also assumed the boxes are wrapped in a form tag

    function getVal(chk, adto) {
  var ad=[];
  var checks = chk.form[chk.name];
  for (i=0;i<checks.length;i++) {
    if (checks[i].checked) {
      ad.push(checks[i].value);
    }
  }
  document.getElementById(adto).value = (ad.length>0)?ad.join(" "):"";

}
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