node-red/nodes/core/core/89-trigger.html

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  Copyright 2014 IBM Corp.

  Licensed under the Apache License, Version 2.0 (the "License");
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<script type="text/x-red" data-template-name="trigger">
    <div class="form-row">
        <label for="node-input-op1type"><i class="fa fa-arrow-up"></i> Output</label>
        <select id="node-input-op1type" style="width:73% !important">
            <option value="val">the value below</option>
            <option value="pay">the existing payload</option>
            <option value="nul">nothing (no output)</option>
        </select>
    </div>
    <div class="form-row" id="node-op1">
        <label for="node-input-op1">&nbsp;</label>
        <input type="text" id="node-input-op1">
    </div>
    <div class="form-row">
        <label for="node-input-duration"><i class="fa fa-clock-o"></i> then wait</label>
        <input type="text" id="node-input-duration" placeholder="250" style="direction:rtl; width:70px !important">
        <select id="node-input-units" style="width:140px !important">
            <option value="ms">Milliseconds</option>
            <option value="s">Seconds</option>
            <option value="min">Minutes</option>
            <option value="hr">Hours</option>
        </select>
    </div>
    <div class="form-row">
        <label for="node-input-op2type"><i class="fa fa-arrow-down"></i> output</label>
        <select id="node-input-op2type" style="width:73% !important">
            <option value="val">the value below</option>
            <option value="pay">the existing payload</option>
            <option value="nul">nothing (no output)</option>
        </select>
    </div>
    <div class="form-row" id="node-op2">
        <label for="node-input-op2">&nbsp;</label>
        <input type="text" id="node-input-op2">
    </div>
    <div class="form-row">
        <label for="node-input-extend"><i class="fa fa-repeat"></i> and</label>
        <select id="node-input-extend" style="width:73% !important">
            <option value="false">don't extend the timer if retriggered</option>
            <option value="true">extend the timer if retriggered</option>
        </select>
    </div>
    <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">Tip: Outputs can be values, null, {{templated}} or msg.payload<br/> -->
    <div class="form-tips">Setting the timeout to 0 sets an infinite timeout = single shot.</div>
    <script>
    {
        $("#node-input-op1type").change(function() {
            if ($("#node-input-op1type").val() == "val") { $("#node-op1").show(); }
            else { $("#node-op1").hide(); }
        });
        $("#node-input-op2type").change(function() {
            if ($("#node-input-op2type").val() == "val") { $("#node-op2").show(); }
            else { $("#node-op2").hide(); }
        });
    }
    </script>
</script>

<script type="text/x-red" data-help-name="trigger">
    <p>Creates two messages on the output separated by a timeout whenever ANY <b>msg</b> arrives on the input.</p>
    <p>For example, this can be used to toggle a Raspberry PI GPIO pin on and off.</p>
    <p>The two output states can be specified as can the duration of the timer.
    Either output can be set to a value, or templated from the inbound
    <b>msg</b> using mustache syntax. <pre>The payload is {{payload}}</pre></p>
    <p>If the payload is an object then setting the output to <i>existing payload</i> will pass the complete payload object through.</p>
    <p>Optionally the timer can be extended by being retriggered... or not.</p>
    <p>By setting the first output to <i>nothing</i>, and selecting extend timer - a watchdog timer can be created.
    No output will happen as long as repeated inputs occur within the timeout period.</p>
    <p>Setting the timer to 0 creates an "infinite" timeout - the first output will happen but the second
    never will, and neither can the first be retriggered - so a true one shot.</p>
    <p>If a <b>msg.reset</b> property is present any timeout currently in progress
    will be cleared and the second output will not happen.</p>
</script>

<script type="text/javascript">
    RED.nodes.registerType('trigger',{
        category: 'function',
        color:"#E6E0F8",
        defaults: {
            op1: {value:"1"},
            op2: {value:"0"},
            op1type: {value:""},
            op2type: {value:""},
            duration: {value:"250",required:true,validate:RED.validators.number()},
            extend: {value:"false"},
            units: {value: "ms"},
            name: {value:""}
        },
        inputs:1,
        outputs:1,
        icon: "trigger.png",
        label: function() {
            if (this.duration > 0) {
                return this.name||"trigger "+this.duration+this.units;
            }
            else {
                return this.name||"trigger once &infin;";
            }
        },
        labelStyle: function() {
            return this.name?"node_label_italic":"";
        },
        oneditprepare: function() {
            $( "#node-input-duration" ).spinner({
                min:1,
                increment:25
            });
        }
    });
</script>