Stop an exec node using button

Dashboard
1

Hi,
I'm new to Node-RED. I'm trying to start and stop an exec node using buttons in dashboard.
But I think it is not a simpler way to kill the exec node. Is there any methods not using the function node in my flow?

[
    {
        "id": "2da5e0579eb45ef8",
        "type": "tab",
        "label": "Test",
        "disabled": false,
        "info": "",
        "env": []
    },
    {
        "id": "30afcce0c0d75c87",
        "type": "debug",
        "z": "2da5e0579eb45ef8",
        "name": "",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "false",
        "statusVal": "",
        "statusType": "auto",
        "x": 670,
        "y": 140,
        "wires": []
    },
    {
        "id": "ef21a8ddbbe44831",
        "type": "ui_button",
        "z": "2da5e0579eb45ef8",
        "name": "",
        "group": "62032b85c8602ef4",
        "order": 0,
        "width": 0,
        "height": 0,
        "passthru": false,
        "label": "start",
        "tooltip": "",
        "color": "",
        "bgcolor": "",
        "className": "",
        "icon": "",
        "payload": "",
        "payloadType": "str",
        "topic": "topic",
        "topicType": "msg",
        "x": 70,
        "y": 140,
        "wires": [
            [
                "2732a810ed7702c9"
            ]
        ]
    },
    {
        "id": "a44057a1c3f00f5b",
        "type": "ui_button",
        "z": "2da5e0579eb45ef8",
        "name": "",
        "group": "62032b85c8602ef4",
        "order": 1,
        "width": 0,
        "height": 0,
        "passthru": false,
        "label": "kill",
        "tooltip": "",
        "color": "",
        "bgcolor": "",
        "className": "",
        "icon": "",
        "payload": "",
        "payloadType": "str",
        "topic": "topic",
        "topicType": "msg",
        "x": 70,
        "y": 200,
        "wires": [
            [
                "5556756c1e738fad"
            ]
        ]
    },
    {
        "id": "2732a810ed7702c9",
        "type": "exec",
        "z": "2da5e0579eb45ef8",
        "command": "ping 192.168.107.153",
        "addpay": "",
        "append": "",
        "useSpawn": "true",
        "timer": "",
        "winHide": false,
        "oldrc": false,
        "name": "",
        "x": 420,
        "y": 140,
        "wires": [
            [
                "3d303f7edb13bc72"
            ],
            [
                "30afcce0c0d75c87"
            ],
            [
                "af012a97515577de"
            ]
        ]
    },
    {
        "id": "5556756c1e738fad",
        "type": "function",
        "z": "2da5e0579eb45ef8",
        "name": "",
        "func": "\nmsg.kill = \"sigint\"\n\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 200,
        "y": 200,
        "wires": [
            [
                "2732a810ed7702c9"
            ]
        ]
    },
    {
        "id": "3d303f7edb13bc72",
        "type": "ui_text",
        "z": "2da5e0579eb45ef8",
        "group": "62032b85c8602ef4",
        "order": 2,
        "width": 0,
        "height": 0,
        "name": "",
        "label": "text",
        "format": "{{msg.payload}}",
        "layout": "col-center",
        "className": "",
        "x": 650,
        "y": 100,
        "wires": []
    },
    {
        "id": "af012a97515577de",
        "type": "debug",
        "z": "2da5e0579eb45ef8",
        "name": "",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "false",
        "statusVal": "",
        "statusType": "auto",
        "x": 670,
        "y": 180,
        "wires": []
    },
    {
        "id": "62032b85c8602ef4",
        "type": "ui_group",
        "name": "Test",
        "tab": "c80db3bbe3798556",
        "order": 1,
        "disp": true,
        "width": "6",
        "collapse": false,
        "className": ""
    },
    {
        "id": "c80db3bbe3798556",
        "type": "ui_tab",
        "name": "Home",
        "icon": "dashboard",
        "disabled": false,
        "hidden": false
    }
]

And on dashboard, how can I arrange the start button on top of other objects?
image

Thanks for your help.

2

Hi @yimin.

Is ping just an example or is that actually what you are calling from exec?

Because you could call ping -c 2 192.168.107.153 and it will automatically exit after 2 pings.

You can set msg.kill with a Change node instead of a Function

From the drop-down just below the hamburger menu choose "Dashboard"
Untitled 7
Find the dashboard tab & choose "layout"
Untitled 8
This no-frills wysiwyg layout editor lets you drag the widgets around.

Untitled 9
Untitled 91000Ă—386 20.5 KB

3

Hi,
Thanks for your help.
The ping is just an example.
The layout is really helpful. Thanks!