node-red/nodes/core/20-inject.html

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<script type="text/x-red" data-template-name="inject">
    <div class="form-row">
        <label for="node-input-topic"><i class="icon-tasks"></i> Topic</label>
        <input type="text" id="node-input-topic" placeholder="Topic">
    </div>
    <div class="form-row node-input-payload">
        <label for="node-input-payload"><i class="icon-envelope"></i> Payload</label>
        <input type="text" id="node-input-payload" placeholder="Payload">
    </div>
    <div class="form-row node-input-repeat">
        <label for="node-input-repeat"><i class="icon-repeat"></i> Repeat (S)</label>
        <input type="text" id="node-input-repeat" placeholder="0">
    </div>
    <div class="form-row">
        <label>&nbsp;</label>
        <input type="checkbox" id="node-input-once" placeholder="once" style="display: inline-block; width: auto; vertical-align: top;">
        <label for="node-input-once" style="width: 70%;">Fire once at start ?</label>
    </div>
    <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-tips">Tip: Injects Date.now() if no payload set.<br/>Repeat interval blank or 0 means no repeat.</div>
</script>

<script type="text/x-red" data-help-name="inject">
	<p>Pressing the button on the left side of the node allows a message on a topic to be injected into the flow. This is mainly for test purposes.</p>
	<p>If no payload is specified the payload is set to the current time in millisecs since 1970. This allows subsequent functions to perform time based actions.</p>
	<p>The repeat function does what it says on the tin and continuously sends the payload every x seconds.</p>
	<p>The Fire once at start option actually waits 50mS before firing to give other nodes a chance to instantiate properly.</p>
</script>

<script type="text/javascript">
    RED.nodes.registerType('inject',{
        category: 'input',
        color:"#a6bbcf",
        defaults: {
            name: {value:""},
            topic: {value:""},
            payload: {value:""},
            repeat: {value:""},
            once: {value:false}
        },
        inputs:0,
        outputs:1,
        icon: "inject.png",
        label: function() {
            return this.name||this.topic||this.payload;
        },
        labelStyle: function() {
            return this.name?"node_label_italic":"";
        },
        button: {
            onclick: function() {
                var label = this.name||this.payload;
                d3.xhr("inject/"+this.id).post(function(err,resp) {
                        if (err) {
                            if (err.status == 404) {
                                RED.notify("<strong>Error</strong>: inject node not deployed","error");
                            } else {
                                RED.notify("<strong>Error</strong>: "+err.response,"error");
                            }
                        } else if (resp.status == 200) {
                            RED.notify("Successfully injected: "+label,"success");
                        } else {
                            if (resp) {
                                RED.notify("<strong>Error</strong>: "+resp,"error");
                            } else {
                                RED.notify("<strong>Error</strong>: no response from server","error");
                            }
                            console.log(err,resp);
                        }
                });
            }
        }
    });

</script>