# Jittering slider when input and output are equal
**URL:** https://discourse.nodered.org/t/jittering-slider-when-input-and-output-are-equal/33561
**Category:** Dashboard
**Created:** [30 September 2020 10:46 UTC](https://discourse.nodered.org/t/jittering-slider-when-input-and-output-are-equal/33561 "2020-09-30T10:46:46Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@DLug](https://discourse.nodered.org/u/DLug)
#### Post date: [30 September 2020 10:46 UTC](https://discourse.nodered.org/t/jittering-slider-when-input-and-output-are-equal/33561/1 "2020-09-30T10:46:47Z")
Hello,
when I feed the slider for my brightness with the current value and also set the same value when changing the slider I get the problem that the slider starts jittering and the brightness values are jumping around.
My flow looks like this:
How do I prevent this behaviour? I want my slider to mirror the current birghtness value as well as set the value with it.
Best regards
---
### Author:  [@Colin](https://discourse.nodered.org/u/Colin)
#### Post date: [30 September 2020 10:58 UTC](https://discourse.nodered.org/t/jittering-slider-when-input-and-output-are-equal/33561/2 "2020-09-30T10:58:46Z")
Can you export a flow showing the problem, maybe use link nodes instead of mqtt. Presumably you have disabled Pass Through in the node.
---
### Author:  [@DLug](https://discourse.nodered.org/u/DLug)
#### Post date: [30 September 2020 14:38 UTC](https://discourse.nodered.org/t/jittering-slider-when-input-and-output-are-equal/33561/3 "2020-09-30T14:38:18Z")
This is my flow:
```auto
[
{
"id": "578b1f3e.dac6e",
"type": "ui_slider",
"z": "9f1ed1de.da5b7",
"name": "",
"label": "Helligkeit",
"tooltip": "",
"group": "fe456f98.7dca5",
"order": 2,
"width": 0,
"height": 0,
"passthru": true,
"outs": "all",
"topic": "",
"min": 0,
"max": "100",
"step": 1,
"x": 620,
"y": 380,
"wires": [
[
"aeda3227.cf9aa"
]
]
},
{
"id": "7c3051b0.8bfae",
"type": "function",
"z": "9f1ed1de.da5b7",
"d": true,
"name": "",
"func": "if (msg.payload !== \"0\")\n return {payload: 100};\nelse\n return {payload: 0};",
"outputs": 1,
"noerr": 0,
"initialize": "",
"finalize": "",
"x": 464.4444351196289,
"y": 323.3333320617676,
"wires": [
[
"9c2c42b8.b38db"
]
]
},
{
"id": "9c2c42b8.b38db",
"type": "ui_switch",
"z": "9f1ed1de.da5b7",
"name": "",
"label": "An/Aus",
"tooltip": "",
"group": "fe456f98.7dca5",
"order": 1,
"width": 0,
"height": 0,
"passthru": false,
"decouple": "true",
"topic": "",
"style": "",
"onvalue": "100",
"onvalueType": "num",
"onicon": "",
"oncolor": "",
"offvalue": "0",
"offvalueType": "num",
"officon": "",
"offcolor": "",
"x": 614.4444351196289,
"y": 323.3333320617676,
"wires": [
[
"aeda3227.cf9aa"
]
]
},
{
"id": "7c822d36.75d064",
"type": "mqtt in",
"z": "9f1ed1de.da5b7",
"name": "",
"topic": "denis/light/brightness",
"qos": "2",
"datatype": "utf8",
"broker": "ce38412c.c11f7",
"x": 200,
"y": 180,
"wires": [
[
"cf86f741.a78b58"
]
]
},
{
"id": "c1e77bf8.7877a8",
"type": "ioBroker out",
"z": "9f1ed1de.da5b7",
"name": "Denis Zimmer Helligkeitslevel",
"topic": "deconz.0.Groups.4.level",
"ack": "false",
"autoCreate": "false",
"stateName": "",
"role": "",
"payloadType": "",
"readonly": "",
"stateUnit": "",
"stateMin": "",
"stateMax": "",
"x": 630,
"y": 180,
"wires": []
},
{
"id": "aeda3227.cf9aa",
"type": "mqtt out",
"z": "9f1ed1de.da5b7",
"name": "",
"topic": "denis/light/brightness",
"qos": "1",
"retain": "",
"broker": "ce38412c.c11f7",
"x": 860,
"y": 340,
"wires": []
},
{
"id": "cf86f741.a78b58",
"type": "function",
"z": "9f1ed1de.da5b7",
"name": "str2Num",
"func": "return {payload: Number(msg.payload)};",
"outputs": 1,
"noerr": 0,
"initialize": "",
"finalize": "",
"x": 400,
"y": 180,
"wires": [
[
"c1e77bf8.7877a8"
]
]
},
{
"id": "9457b274.b7c68",
"type": "mqtt in",
"z": "9f1ed1de.da5b7",
"name": "",
"topic": "denis/light/brightness",
"qos": "2",
"datatype": "utf8",
"broker": "ce38412c.c11f7",
"x": 200,
"y": 340,
"wires": [
[
"7c3051b0.8bfae",
"578b1f3e.dac6e"
]
]
},
{
"id": "fe456f98.7dca5",
"type": "ui_group",
"z": "",
"name": "Licht",
"tab": "12bbff51.05ec81",
"order": 1,
"disp": true,
"width": "6",
"collapse": false
},
{
"id": "ce38412c.c11f7",
"type": "mqtt-broker",
"z": "",
"name": "MQTT",
"broker": "localhost",
"port": "1883",
"clientid": "",
"usetls": false,
"compatmode": false,
"keepalive": "60",
"cleansession": true,
"birthTopic": "",
"birthQos": "0",
"birthPayload": "",
"closeTopic": "",
"closeQos": "0",
"closePayload": "",
"willTopic": "",
"willQos": "0",
"willPayload": ""
},
{
"id": "12bbff51.05ec81",
"type": "ui_tab",
"z": "",
"name": "Denis' Zimmer",
"icon": "dashboard",
"order": 4,
"disabled": false,
"hidden": false
}
]
```
In the slider there is no option to pass through the message. I see this option only for the button but that element is not the problem.
---
### Author:  [@Colin](https://discourse.nodered.org/u/Colin)
#### Post date: [30 September 2020 16:14 UTC](https://discourse.nodered.org/t/jittering-slider-when-input-and-output-are-equal/33561/4 "2020-09-30T16:14:32Z")
> [@Colin](#):
>
> Presumably you have disabled Pass Through in the node.
Did you see that comment?
---
### Author:  [@DLug](https://discourse.nodered.org/u/DLug)
#### Post date: [30 September 2020 16:57 UTC](https://discourse.nodered.org/t/jittering-slider-when-input-and-output-are-equal/33561/5 "2020-09-30T16:57:12Z")
See the comment under my code. I can't see any option in the slider settings.
There is only this option:
---
### Author:  [@Colin](https://discourse.nodered.org/u/Colin)
#### Post date: [30 September 2020 18:08 UTC](https://discourse.nodered.org/t/jittering-slider-when-input-and-output-are-equal/33561/6 "2020-09-30T18:08:27Z")
Oh, yes, sorry I never realised that node does not have a pass through option, which makes it rather different to the switch node, for example.
Unfortunately because of using mqtt it is not easy to run your flow. Could you make a simple example using link nodes instead? Put a small delay if necessary. Also don't include any non-core nodes if possible. Inject nodes can be used to simulate data.
---
### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [30 October 2020 18:08 UTC](https://discourse.nodered.org/t/jittering-slider-when-input-and-output-are-equal/33561/7 "2020-10-30T18:08:34Z")
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