Check all other checkboxes when one is checked

Question

I have a form and group of checkboxes in it. (These checkboxes are dynamically created but I dont think it is important for this question). The code that generates them look

Answer 1

Only in JavaScript with auto check/uncheck functionality of master when any child is checked/unchecked.

function FnCheckAll()
    {
        var ChildChkBoxes = document.getElementsByName("ChildCheckBox");
        for (i = 0; i < ChildChkBoxes.length; i++)
        {
            ChildChkBoxes[i].checked = document.forms[0].CheckAll.checked;
        }
    }
function FnCheckChild()
    {
        if (document.forms[0].ChildCheckBox.length > document.querySelectorAll('input[name="ChildCheckBox"]:checked').length)
            document.forms[0].CheckAll.checked = false;
        else
            document.forms[0].CheckAll.checked = true;
    }

Master CheckBox:

Child CheckBox:

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