Question

I have this code:

HTML

<table class=tbl>
    <tr>
        <td>
            <input class='c1' type='checkbox'>
            <label>Ceckbox1</label>
        </td>
        <td>
            <input class='c2' type='checkbox'>
            <label>Ceckbox2</label>
        </td>
        <td>
            <input class='c2' type='checkbox'>
            <label>Ceckbox2</label>
        </td>
        <td>
            <input class='c2' type='checkbox'>
            <label>Ceckbox2</label>
        </td>
    </tr>
</table>
<table class=tbl>
    <tr>
        <td>
            <input class='c1' type='checkbox'>
            <label>Ceckbox1</label>
        </td>
        <td>
            <input class='c2' type='checkbox'>
            <label>Ceckbox2</label>
        </td>
        <td>
            <input class='c2' type='checkbox'>
            <label>Ceckbox2</label>
        </td>
        <td>
            <input class='c2' type='checkbox'>
            <label>Ceckbox2</label>
        </td>
     </tr>
   </table>

JavaScript

 $('.c2').click(function () {
     if ($(this).parent().find('.c2').is(':checked')) {
         alert('all are checked');
     } else {
         alert('none are checked');
     }
 });

I am trying, with no result, to use jquery to auto-check ‘c1’ only when all the ‘c2’ from the same ‘tbl’ are checked. The count of ‘c2’ can vary as can the count of ‘tbl’.

Answer 1

Try this code it works:

DEMO

$('.c2').change(function(){
    var all = true;
    $(this).parent().parent().find('.c2').each(function(index){
        if(!($(this).is(':checked'))){
           all =  false;
        }
    });
    if (all==true){
        $(this).parent().parent().find('.c1').attr('checked', true);
    }
});