[javascript] How to change Label Value using javascript

I want to change the label value from '0' to 'thanks' in below label, on checkbox click event.

<input type="hidden" name="label206451" value="0" />
<label for="txt206451" class="swatch_text" >Chestnut Leather</label>
<input type="checkbox" name="field206451" class="swatch_check" id="txt206451" value="SELECTED"/>

The Javascript is as below.

var cb = document.getElementById('field206451');
var label = document.getElementById('label206451');
cb.addEventListener('click',function(evt){
    if(cb.checked){
        label.value='Thanks';
    }else{
        label.value='0';
    }
},false);

But this is not working. Any idea?

This will work in Chrome

// get your input
var input = document.getElementById('txt206451');
// get it's (first) label
var label = input.labels[0];
// change it's content
label.textContent = 'thanks'

But after looking, labels doesn't seem to be widely supported..

You can use querySelector

// get txt206451's (first) label
var label = document.querySelector('label[for="txt206451"]');
// change it's content
label.textContent = 'thanks'

hope this help someone else : use innerHTML for using label object.

  document.getElementById('lableObject').innerHTML = res.FullName;

Try

use an id for hidden field and use id of checkbox in javascript.

and change the ClientIDMode="static" too

<input type="hidden" ClientIDMode="static" id="label1" name="label206451" value="0" />

   <script type="text/javascript"> 
    var cb = document.getElementById('txt206451');
    var label = document.getElementById('label1');
    cb.addEventListener('click',function(evt){
    if(cb.checked){
        label.value='Thanks'
    }else{
        label.value='0'
    }
    },false);
    </script>

Based off your code, i created this Fiddle
You need to use

var cb = document.getElementsByName('field206451')[0];
var label = document.getElementsByName('label206451')[0];

if you want to use name attributes then you have to take the index since it is a list of items, not just a single one. Everything else worked good.

very simple

$('#label-ID').text("label value which you want to set");