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

<!--
  Copyright 2013, 2016 IBM Corp.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

  http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
-->

<script type="text/x-red" data-template-name="function">
    <div class="form-row">
        <label for="node-input-name"><i class="fa fa-tag"></i> <span data-i18n="common.label.name"></span></label>
        <input type="text" id="node-input-name" data-i18n="[placeholder]common.label.name">
    </div>
    <div class="form-row" style="margin-bottom: 0px;">
        <label for="node-input-func"><i class="fa fa-wrench"></i> <span data-i18n="function.label.function"></span></label>
        <input type="hidden" id="node-input-func" autofocus="autofocus">
        <input type="hidden" id="node-input-noerr">
    </div>
    <div class="form-row node-text-editor-row">
        <div style="height: 250px; min-height:150px;" class="node-text-editor" id="node-input-func-editor" ></div>
    </div>
    <div class="form-row">
        <label for="node-input-outputs"><i class="fa fa-random"></i> <span data-i18n="function.label.outputs"></span></label>
        <input id="node-input-outputs" style="width: 60px;" value="1">
    </div>
    <div class="form-tips"><span data-i18n="function.tip"></span></div>
</script>

<script type="text/x-red" data-help-name="function">
    <p>A function block where you can write code to do more interesting things.</p>
    <p>The message is passed in as a JavaScript object called <code>msg</code>.</p>
    <p>By convention it will have a <code>msg.payload</code> property containing
       the body of the message.</p>
    <h4>Logging and Error Handling</h4>
    <p>To log any information, or report an error, the following functions are available:</p>
        <ul>
            <li><code>node.log("Log")</code></li>
            <li><code>node.warn("Warning")</code></li>
            <li><code>node.error("Error")</code></li>
        </ul>
    </p>
    <p>The Catch node can also be used to handle errors. To invoke a Catch node,
    pass <code>msg</code> as a second argument to <code>node.error</code>:</p>
    <pre>node.error("Error",msg)</pre>
    <h4>Sending messages</h4>
    <p>The function can either return the messages it wants to pass on to the next nodes
    in the flow, or can call <code>node.send(messages)</code>.</p>
    <p>It can return/send:</p>
    <ul>
      <li>a single message object - passed to nodes connected to the first output</li>
      <li>an array of message objects - passed to nodes connected to the corresponding outputs</li>
    </ul>
    <p>If any element of the array is itself an array of messages, multiple
          messages are sent to the corresponding output.</p>
    <p>If null is returned, either by itself or as an element of the array, no
          message is passed on.</p>
    <p>See the <a target="_blank" href="http://nodered.org/docs/writing-functions.html">online documentation</a> for more help.</p>

</script>

<script type="text/javascript">
    RED.nodes.registerType('function',{
        color:"#fdd0a2",
        category: 'function',
        defaults: {
            name: {value:""},
            func: {value:"\nreturn msg;"},
            outputs: {value:1},
            noerr: {value:0,required:true,validate:function(v){ return ((!v) || (v === 0)) ? true : false; }}
        },
        inputs:1,
        outputs:1,
        icon: "function.png",
        label: function() {
            return this.name;
        },
        oneditprepare: function() {
            var that = this;
            $( "#node-input-outputs" ).spinner({
                min:1
            });

            this.editor = RED.editor.createEditor({
                id: 'node-input-func-editor',
                mode: 'ace/mode/javascript',
                value: $("#node-input-func").val(),
                globals: {
                    msg:true,
                    context:true,
                    RED: true,
                    util: true,
                    flow: true,
                    global: true,
                    console: true,
                    Buffer: true,
                    setTimeout: true,
                    clearTimeout: true,
                    setInterval: true,
                    clearInterval: true
                }
            });

            RED.library.create({
                url:"functions", // where to get the data from
                type:"function", // the type of object the library is for
                editor:this.editor, // the field name the main text body goes to
                mode:"ace/mode/javascript",
                fields:['name','outputs']
            });
            this.editor.focus();
        },
        oneditsave: function() {
            var annot = this.editor.getSession().getAnnotations();
            this.noerr = 0;
            $("#node-input-noerr").val(0);
            for (var k=0; k < annot.length; k++) {
                //console.log(annot[k].type,":",annot[k].text, "on line", annot[k].row);
                if (annot[k].type === "error") {
                    $("#node-input-noerr").val(annot.length);
                    this.noerr = annot.length;
                }
            }
            $("#node-input-func").val(this.editor.getValue());
            delete this.editor;
        },
        oneditresize: function(size) {
            var rows = $("#dialog-form>div:not(.node-text-editor-row)");
            var height = $("#dialog-form").height();
            for (var i=0;i<rows.size();i++) {
                height -= $(rows[i]).outerHeight(true);
            }
            var editorRow = $("#dialog-form>div.node-text-editor-row");
            height -= (parseInt(editorRow.css("marginTop"))+parseInt(editorRow.css("marginBottom")));
            $(".node-text-editor").css("height",height+"px");
            this.editor.resize();
        }
    });
</script>