Is there problem with my javascript function?

I wrote HTML table in which i have checkbox for every row. So now i want to add checkbox in my header which will check all check boxes in the table. I have done it, but it does not work. Any idea?

<table class="table table-hover table-inbox">
    <thead>
        <tr>
            <th>
                <input type="checkbox" class="i-checks" id="allmsgs">
            </th>
            <th>Sender</th>
            <th>Message</th>
            <th>Last Message</th>
        </tr>
    </thead>
    <tbody>
        <tr class="">
            <td class="">
                <input type="checkbox" name="1" class="i-checks msg">
            </td>
            <td><a href="#">Jeremy Massey</a></td>
            <td><a href="#">Lorem ipsum dolor sit amet, consectetur adipiscing elit.</a></td>
            <td class="mail-date"><a href="#">12/12/2019 15:35</a></td>
        </tr>
        <tr class="unread active">
            <td class="">
                <input type="checkbox" name="2" class="i-checks msg">
            </td>
            <td><a href="#">Marshall Horne</a></td>
            <td><a href="#">Praesent nec nisl sed neque ornare maximus at ac enim.</a></td>
            <td class="mail-date">12/12/2019 15:35</td>
        </tr>
        <tr>
            <td class="">
                <input type="checkbox" name="3" class="i-checks msg">
            </td>
            <td><a href="#">Grant Franco</a></td>
            <td><a href="#">Etiam maximus tellus a turpis tempor mollis.</a></td>
            <td class="mail-date">12/12/2019 15:35</td>
        </tr>
    </tbody>
</table>

I have also javascript function ...

$(document).ready(function() {

    $('#allmsgs').click(function(event) {
        if(this.checked) {
            $('.msg').each(function() {
                this.checked = true;
            });
        } else {
            $('.msg').each(function() {
                this.checked = false;
            });
        }
    });
});

which is located in my scripts.js file and this one is linked with html (link is not the problem because other functions are working.