node-red-contrib-trigger-empty/trigger-empty.html

Sends On on input of an On trigger, and when for all On triggers an Off was received off, Send Off

<script type="text/javascript">
    RED.nodes.registerType('trigger-empty',{
        category: 'function',
        color: '#a6bfcf',
        defaults: {
            name: {value:""},
            topic:{value:"Topic"},
            on_payload:{value:"On"},
            off_payload:{value:"Off"}
        },
        inputs:1,
        outputs:1,
        align: "right",
        icon: "function.png",
        label: function() {
            return this.name||this.topic||"trigger-empty";
        }
    });
</script>

<script type="text/x-red" data-template-name="trigger-empty">
    <div class="form-row">
        <label for="node-input-name"><i class="icon-tag"></i> Name</label>
        <input type="text" id="node-input-name" placeholder="Name">
    </div>
    <div class="form-row">
        <label for="node-input-topic"><i class="icon-tag"></i> Out Topic</label>
        <input type="text" id="node-input-topic" placeholder="Topic">
    </div>
    <div class="form-row">
        <label for="node-input-on_payload"><i class="icon-tag"></i> On payload</label>
        <input type="text" id="node-input-on_payload" placeholder="On">
    </div>
    <div class="form-row">
        <label for="node-input-off_payload"><i class="icon-tag"></i> Off payload</label>
        <input type="text" id="node-input-off_payload" placeholder="Off">
    </div>
</script>

<script type="text/x-red" data-help-name="trigger-empty">
    <p>A node that directly send an "On" on the given topic, when it receives an "On", on a topic. 
	Stores the "On" per topic and if all topics that send an "On" have send an "Off", sends an "Off" on the given topic.
	So basically a dynamic OR gate for topics. The actual "On" and "Off" value can be entered in Config.
	The send value is (case-insensitive) checked against the on or off value. The entered value is send.</p>
</script>