ui-load.html

<script type="text/x-red" data-template-name="hidden-ui-load">

    <div class="form-row">
        <label for="node-input-group"><i class="fa fa-table"></i> Group</label>
        <input type="text" id="node-input-group">
    </div>

    <div class="form-row">
        <label><i class="fa fa-object-group"></i> Size</label>
        <input type="hidden" id="node-input-width">
        <input type="hidden" id="node-input-height">
        <button class="editor-button" id="node-input-size"></button>
    </div>

    <div class="form-row">
        <label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
        <input type="text" id="node-input-name">
    </div>

</script>

<script type="text/javascript">

    RED.nodes.registerType('hidden-ui-load', {
        category: 'ui',
        color: 'rgb( 63, 173, 181)',
        defaults: {
            group: { type: 'ui_group', required: true },
            order: { value: 0 },
            name: { value: "" }
        },
        inputs: 0,
        outputs: 1,
        icon: "empty.png",
        paletteLabel: 'load',
        label: function () {
            return this.name || "On Load";
        },
        oneditprepare: function () {
            $("#node-input-size").elementSizer({
                width: "#node-input-width",
                height: "#node-input-height",
                group: "#node-input-group"
            });
        }
    });
</script>