The manual for the JobRouter developer

A handlebars template is used to display widgets. This provides the HTML which is always filled with the current data from the widget class.
In addition to simple placeholders such as {{NoEntries}} handlebars also allow to use control structures such as {{#each items}}.

<div class="jr-dashboard-container">

<ul class="jr-dashboard-list">{{#each items}}

    <li class="jr-dashboard-list-item">

        {{#if this.value}}

            <span class="jr-dashboard-list-value">{{this.value}}</span>

        {{/if}}

        {{#if this.label}}

            <span class="jr-dashboard-list-label">{{this.label}}</span>

        {{/if}}

    </li>

{{else}}

    <p class="jr-dashboard-empty-widget">{{noEntries}}</p>

{{/each}}

</ul>

</div>

Please note: If you have not implemented a getTemplate method in your Widget class, the handlebars template must be stored exactly as template.hbs in the widget folder. A different name for the file causes the widget to be displayed empty.