How can we set the indeterminate state of checkbox using javascript?

try this

<script type='text/javascript' src='http://ajax.googleapis.com/ajax/libs/jquery/1.8.1/jquery.min.js?ver=3.6.1'></script>

<input id='chk' type='checkbox' />

<script type='text/javascript'>

$(document).ready(function(){

$('#chk').click(function(){

if (this.readOnly==true){

this.checked=false;

this.readOnly=false;

}

else if (this.checked==false){

this.indeterminate=true;

this.readOnly=true;

}

});

});

</script>