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> <span data-i18n="rbe.label.func"></span></label>
        <select type="text" id="node-input-func" style="width:74%;">
            <option value="rbe" data-i18n="rbe.opts.rbe"></option>
            <option value="deadband" data-i18n="rbe.opts.deadband"></option>
        </select>
    </div>
    <div class="form-row" id="node-bandgap">
        <label for="node-input-gap">&nbsp;</label>
        <input type="text" id="node-input-gap" data-i18n="[placeholder]rbe.placeholder.bandgap" style="width:71%;">
    </div>
    <div class="form-row">
        <label for="node-input-name"><i class="fa fa-tag"/> <span data-i18n="rbe.label.name"></span></label>
        <input type="text" id="node-input-name" data-i18n="[placeholder]rbe.label.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>The node can either block until the <b>msg.payload</b> is
    different to the previous one - <b>rbe</b> mode. Works on numbers and strings.</p>
    <p>Or it can block until the value changes by a specified amount - <b>deadband</b> mode.</p>
    <p>In deadband 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*|)(%|)$/)}
        },
        inputs:1,
        outputs:1,
        icon: "rbe.png",
        label: function() {
            return this.name||this.func||"rbe";
        },
        labelStyle: function() {
            return this.name?"node_label_italic":"";
        },
        oneditprepare: function() {
            //$( "#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>