How can I require at least one checkbox be checked before a form can be submitted?

Question

Here’s an example using jquery and your html.

$(document).ready(function () {
    $('#checkBtn').click(function() {
        checked = $("input[type=checkbox]:checked").length;

        if(!checked) {
            alert("You must check at least one checkbox.");
            return false;
        }
    });
});

<html>
    <head>
         <script src="http://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
    </head>
    <body>
        <p>Box Set 1</p>
        <ul>
            <li><input name="BoxSelect[]" type="checkbox" value="Box 1" required><label>Box 1</label></li>
            <li><input name="BoxSelect[]" type="checkbox" value="Box 2" required><label>Box 2</label></li>
            <li><input name="BoxSelect[]" type="checkbox" value="Box 3" required><label>Box 3</label></li>
            <li><input name="BoxSelect[]" type="checkbox" value="Box 4" required><label>Box 4</label></li>
        </ul>
        <p>Box Set 2</p>
        <ul>
            <li><input name="BoxSelect[]" type="checkbox" value="Box 5" required><label>Box 5</label></li>
            <li><input name="BoxSelect[]" type="checkbox" value="Box 6" required><label>Box 6</label></li>
            <li><input name="BoxSelect[]" type="checkbox" value="Box 7" required><label>Box 7</label></li>
            <li><input name="BoxSelect[]" type="checkbox" value="Box 8" required><label>Box 8</label></li>
        </ul>
        <p>Box Set 3</p>
        <ul>
            <li><input name="BoxSelect[]" type="checkbox" value="Box 9" required><label>Box 9</label></li>
        </ul>
        <p>Box Set 4</p>
        <ul>
            <li><input name="BoxSelect[]" type="checkbox" value="Box 10" required><label>Box 10</label></li>
        </ul>
        <input type="button" value="Test Required" id="checkBtn">
    </body>
</html>

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