node-red/nodes/core/80-function.html

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<script type="text/x-red" data-template-name="function">
    <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-func"><i class="icon-wrench"></i> Function</label>
        <input type="hidden" id="node-input-func">
        <div style="height: 250px;" class="node-text-editor" id="node-input-func-editor" ></div>
    </div>
    <div class="form-row">
        <label for="node-input-outputs"><i class="icon-random"></i> Outputs</label>
        <input id="node-input-outputs" style="width: 60px; height: 1.7em;" value="1">
    </div>
</script>

<script type="text/x-red" data-help-name="function">
	<p>The generic function block where you can write code to do more interesting things.</p>
	<p>You can have multiple outputs - in which case the function expects you to return an array of messages... <pre>return [msg,msg2,...];</pre></p>
	<p>You may return null for any or all outputs if you want to.</p>
	<p>You can save your functions to a library (button to right of name field) - and likewise pick from that library.</p>
</script>

<script type="text/javascript">
    RED.nodes.registerType('function',{
        color:"#fdd0a2",
        category: 'function',
        defaults: {
            name: {value:""},
            func: {value:"// The received message is stored in 'msg'\n// It will have at least a 'payload' property:\n//   console.log(msg.payload);\n// The 'context' object is available to store state\n// between invocations of the function\n//   context = {};\n\n\nreturn msg;"},
            outputs: {value:1}
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        inputs:1,
        outputs:1,
        icon: "function.png",
        label: function() {
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            $( "#dialog" ).one("dialogclose", function(ev,ui) {
                var height = $( "#dialog" ).dialog('option','height');
                $( "#dialog" ).off("dialogresize",functionDialogResize);
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            var that = this;
            require(["orion/editor/edit"], function(edit) {
                that.editor = edit({
                    parent:document.getElementById('node-input-func-editor'),
                    lang:"js",
                    contents: $("#node-input-func").val()
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                RED.library.create({
                    url:"functions", // where to get the data from
                    type:"function", // the type of object the library is for
                    editor:that.editor, // the field name the main text body goes to
                    fields:['name','outputs']
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