node-red/nodes/core/logic/16-range.html

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<script type="text/x-red" data-template-name="range">
    <div class="form-row">
        <label for="node-input-action"><i class="fa fa-dot-circle-o"></i> Action</label>
        <select id="node-input-action" style="width:70%; margin-right:5px;">
            <option value="scale">Scale msg.payload</option>
            <option value="clamp">Scale and limit to the target range</option>
            <option value="roll">Scale and wrap within the target range</option>
        </select>
    </div>
    <br/>
    <div class="form-row"><i class="fa fa-sign-in"></i> Map the input range:</div>
    <div class="form-row"><label></label>
        from: <input type="text" id="node-input-minin" placeholder="e.g. 0" style="width:100px;"/>
        &nbsp;&nbsp;to: <input type="text" id="node-input-maxin" placeholder="e.g. 99" style="width:100px;"/>
    </div>
    <div class="form-row"><i class="fa fa-sign-out"></i> to the result range:</div>
    <div class="form-row"><label></label>
        from: <input type="text" id="node-input-minout" placeholder="e.g. 0" style="width:100px;"/>
        &nbsp;&nbsp;to: <input type="text" id="node-input-maxout" placeholder="e.g. 255" style="width:100px;"/>
    </div>
    <br/>
    <div class="form-row"><label></label>
        <input type="checkbox" id="node-input-round" style="display: inline-block; width: auto; vertical-align: top;">
        <label style="width: auto;" for="node-input-round">Round result to the nearest integer?</label></input>
    </div>
    <br/>
    <div class="form-row">
        <label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
        <input type="text" id="node-input-name" placeholder="Name">
    </div>
    <div class="form-tips" id="node-tip">Tip: This node ONLY works with numbers.</div>
</script>

<script type="text/x-red" data-help-name="range">
    <p>A simple function node to remap numeric input values to another scale.</p>
    <p>Currently only does a linear scaling.</p>
    <p><b>Note:</b> This only operates on <b>numbers</b>. Anything else will try to be made into a number and rejected if that fails.</p>
    <p><i>Scale and limit to target range</i> means that the result will never be outside the range specified within the result range.</p>
    <p><i>Scale and wrap within the target range</i> means that the result will essentially be a "modulo-style" wrap-around within the result range.</p>
</script>

<script type="text/javascript">
    RED.nodes.registerType('range', {
        color: "#E2D96E",
        category: 'function',
        defaults: {
            minin: {value:"",required:true,validate:RED.validators.number()},
            maxin: {value:"",required:true,validate:RED.validators.number()},
            minout: {value:"",required:true,validate:RED.validators.number()},
            maxout: {value:"",required:true,validate:RED.validators.number()},
            action: {value:"scale"},
            round: {value:false},
            name: {value:""}
        },
        inputs: 1,
        outputs: 1,
        icon: "range.png",
        label: function() {
            return this.name || "range";
        },
        labelStyle: function() {
            return this.name ? "node_label_italic" : "";
        }
    });
</script>