Uncaught TypeError: Cannot read property 'setAttribute' of undefined at Object.onLoad

Question

Any ideas what might be causing this error?

List of my includes:

<link rel="stylesheet" href="../../node_modules/semantic-ui/dist/semantic.min.css">
<link rel="stylesheet" href="../../node_modules/font-awesome/css/font-awesome.min.css">
<link rel="stylesheet" href="../../node_modules/bootstrap/dist/css/bootstrap.min.css">
<link rel="stylesheet" href="../../node_modules/fullcalendar/dist/fullcalendar.min.css">
<script src="../../node_modules/semantic-ui/dist/semantic.min.js"></script>
<script src="../../node_modules/bootstrap/dist/js/bootstrap.bundle.min.js"></script>
<script src="../../node_modules/moment/min/moment.min.js"></script>
<script src="../../node_modules/fullcalendar/dist/fullcalendar.min.js"></script>

HTML Element:

<div class="ui floating dropdown labeled search icon button" style="width: 95%; margin: 0 auto;" id="monthDrop">
    <i class="calendar icon"></i>
    <span class="text">Choose a Month</span>
    <div class="menu">
                <div class="item">January</div>
                <div class="item">February</div>
                <div class="item">March</div>
                <div class="item">April</div>
                <div class="item">May</div>
                <div class="item">June</div>
                <div class="item">July</div>
                <div class="item">August</div>
                <div class="item">September</div>
                <div class="item">October</div>
                <div class="item">November</div>
                <div class="item">December</div>
    </div>
</div>

Script:

$('#monthDrop').dropdown();

It renders fine and everything and no errors on load, just this when I try to click on it:

Answer 1

We ran into the same error with the following html:

<select class="btn btn-secondary dropdown-toggle" data-toggle="dropdown" role="button" v-model="selected" aria-haspopup="true" aria-expanded="false">
    <option disabled value="">Please select one</option>
    <option class="dropdown-item" value="type1">Carrier</option>
    <option class="dropdown-item" value="type2">Shipper</option>
</select>

We tried removing data-toggle="dropdown" from the <select> tag; the error no longer occurred, and the dropdown menu still functioned. Not sure why this works, but it got rid of the error for us. Must be a conflict somehow? Anyways, if someone else is looking for a solution, this workaround may work for them.