spee.ch/views/partials/publishForm-Channel.handlebars

<div class="row">
    <div class="column column--3">
        <label class="label" for="channel-name-select">Channel:</label>
    </div>
    <div class="column column--9">
        <div id="input-error-channel-select" class="info-message info-message--failure"></div>
        <select type="text" id="channel-name-select" class="select select--primary" value="channel" onchange="toggleChannel(event)">
        <optgroup>
            {{#if user}}
                <option value="@{{user.userName}}" >@{{user.userName}}</option>
            {{/if}}
            <option value="none" >None</option>
        </optgroup>
        <optgroup>
            <option value="login">Login</option>
            <option value="new" >New</option>
        </optgroup>
        </select>
    </div>
</div>

<div id="channel-login-details" class="row" hidden="true">
    {{> channelLoginForm}}
</div>

<div  id="channel-create-details" class="row" hidden="true">
    {{> channelCreationForm}}
</div>

<script src="/assets/js/authFunctions.js"></script>
<script type="text/javascript">
 function toggleChannel (event) {
     const createChannelTool = document.getElementById('channel-create-details');
     const loginToChannelTool = document.getElementById('channel-login-details');
     const selectedOption = event.target.selectedOptions[0].value;
     const urlChannel = document.getElementById('url-channel');
     if (selectedOption === 'new') {
         // show/hide the login and new channel forms
         createChannelTool.hidden = false;
         loginToChannelTool.hidden = true;
         // update URL
         urlChannel.innerText = '';
     } else if (selectedOption === 'login') {
         // show/hide the login and new channel forms
         loginToChannelTool.hidden = false;
         createChannelTool.hidden = true;
         // update URL
         urlChannel.innerText = '';
     } else {
         // hide the login and new channel forms
         loginToChannelTool.hidden = true;
         createChannelTool.hidden = true;
         hideError(document.getElementById('input-error-channel-select'));
         // update URL
         if (selectedOption === 'none'){
             urlChannel.innerText = '';
         } else {
             urlChannel.innerText = `${selectedOption}/`;
         }

     }
 }
</script>