node-red-nodes/function/rbe/rbe.html

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<script type="text/x-red" data-template-name="rbe">
    <div class="form-row">
        <label for="node-input-func"><i class="fa fa-wrench"></i> Mode</label>
        <select type="text" id="node-input-func" style="width:74%;">
            <option value="rbe">RBE - report if value changed</option>
            <option value="deadband">Deadband - report if changed more than</option>
        </select>
    </div>
    <div class="form-row" id="node-bandgap">
        <label for="node-input-gap"><i class="fa fa-random"></i> Band gap</label>
        <input type="text" id="node-input-gap" placeholder="e.g. 10 or 5%" style="width:71%;">
    </div>
    <div class="form-row">
        <label for="node-input-name"><i class="fa fa-tag"/> Name</label>
        <input type="text" id="node-input-name" placeholder="Name" style="width:71%;">
    </div>
</script>

<script type="text/x-red" data-help-name="rbe">
    <p>Report by Exception node - only passes on data if it has changed.</p>
    <p>In <b>RBE</b> mode this node only outputs the msg if the <b>msg.payload</b> is
    different to the previous one. Works on numbers and strings.</p>
    <p>In <b>deadband</b> mode the incoming payload should contain a parseable <i>number</i> and is
    output only if greater than + or - the <i>band gap</i> away from the previous output.</p>
    <p>Deadband also supports % - only sends if the input differs by more than x% of the original value.</p>
    <p><b>Note:</b> This works on a per <b>msg.topic</b> basis. This means that a single rbe node can
handle multiple topics at the same time.</p>
</script>

<script type="text/javascript">
    RED.nodes.registerType('rbe',{
        color:"#E2D96E",
        category: 'function',
        defaults: {
            name: {value:""},
            func: {value:"rbe"},
            gap: {value:"",validate:RED.validators.regex(/^(\d*|)(%|)$/)}
        },
        inputs:1,
        outputs:1,
        icon: "function.png",
        label: function() {
            return this.name||this.func||"rbe";
        },
        labelStyle: function() {
            return this.name?"node_label_italic":"";
        },
        oneditprepare: function() {
            //$( "#node-input-gap" ).spinner({min:0});
            $("#node-input-func").on("change",function() {
                if ($("#node-input-func").val() === "rbe") {
                    $("#node-bandgap").hide();
                } else {
                    $("#node-bandgap").show();
                }
            });
        }
    });
</script>