Group and chart refresh problem

hello, I'm making a project where I change the displayed groups with a drop down list, it works good but the main problem is that when I make the change some charts lost the values and don't show anything until I refresh the page (F5), is there anything i could make to auto refresh the charts?
I tried to use the UI_contro to refresh the tab but the problem is not the tab, the problem are the charts

here is how it sees when the charts doesn't refresh

Saving current chart values and restoring them on system restart helps to avoid long wait until new data arrives.
Simplest way to save/restore data is using of Persist nodes. https://flows.nodered.org/node/node-red-contrib-persist

Hint: It's good practice to set some text in Graph node in the field of "No data". So you can be sure if data is missing or there are problems with charting.

odd... seems to work for me unfortunately...I'd need a copy of your flow (or the relevant bits) in order to recreate.

it also works for me the first time but i have a lot of charts and more than one page, I mean that in the area selecter I have 4 options and when i check the first time they have the values displayed, but if I go back a second time the lost the graph and I have to reload the page to see again the charts

this is a litte part of my flow, but you will need to recreate the message
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msg;","outputs":1,"noerr":0,"x":350,"y":980,"wires":[["2187d9ee.931226"]]},{"id":"2187d9ee.931226","type":"ui_template","z":"76b24d87.ec5044","group":"6aeccfbc.1207b","name":"estado","order":1,"width":"15","height":"10","format":"\n .filled { \n height: 100% !important;\n\n padding: 0 !important;\n margin: 0 !important;\n }\n\n.led {\n float: right;\n padding: 20px;\n width: 220px;\n height: 15px;\n margin: 10px 10px 10px 10px;\n border-radius: 5%;\n \n}\n\n\n

\n \n \n <th colspan="2">

Estado de la Variable

\n \n \n \n \n \n \n \n \n \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n\n \n \n \n \n\n \n \n \n \n \n\n \n \n \n \n \n \n
<span class="led" "filled" style="background-color: {{msg.payload.arcilla}}; box-shadow: black 0 -1px 1px 0px">

Arcilla

<span class="led" style="background-color:{{msg.payload.humedad}}; box-shadow: black 0 -1px 1px 0px">

Humedad

<span class="led" style="background-color: {{msg.payload.compactabilidad}}; box-shadow: black 0 -1px 1px 0px">

Compactabilidad

<span class="led" style="background-color: {{msg.payload.temperatura}}; box-shadow: black 0 -1px 1px 0px">

Temperatura

<span class="led" style="background-color: {{msg.payload.resistencia}}; box-shadow: black 0 -1px 1px 0px">

Resistencia mínima

<span class="led" style="background-color: {{msg.payload.permeabilidad}}; box-shadow: black 0 -1px 1px 0px">

Permeabilidad

<span class="led" style="background-color: {{msg.payload.tension}}; box-shadow: black 0 -1px 1px 0px">

Resistencia a la Tensión

<span class="led" style="background-color: blue; box-shadow: black 0 -1px 1px 0px">

Agua = {{msg.payload.agua}} Lts

<span class="led" style="background-color: blue; box-shadow: black 0 -1px 1px 0px">

Arena nueva = {{msg.payload.arena}} Kg

<span class="led" style="background-color: blue; box-shadow: black 0 -1px 1px 0px">

Premezcla = {{msg.payload.premezcla}} Kg

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please use three backticks before and after any code blocks you paste to make them readable and importable.
```
your code
```

oooo sorry and thanks hahaha

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Actual","format":"{{msg.payload}}","layout":"row-spread","x":1050,"y":520,"wires":[]},{"id":"69c54557.27939c","type":"ui_text","z":"76b24d87.ec5044","group":"25d8c313.225b3c","order":4,"width":0,"height":0,"name":"","label":"Valor Actual","format":"{{msg.payload}}","layout":"row-spread","x":1050,"y":600,"wires":[]},{"id":"5ea929f2.2c10e8","type":"ui_text","z":"76b24d87.ec5044","group":"9ab8e559.336708","order":2,"width":0,"height":0,"name":"","label":"Valor Actual","format":"{{msg.payload}}","layout":"row-spread","x":1050,"y":680,"wires":[]},{"id":"b406c18c.3ecb8","type":"ui_text","z":"76b24d87.ec5044","group":"9ab8e559.336708","order":4,"width":0,"height":0,"name":"","label":"Valor Actual","format":"{{msg.payload}}","layout":"row-spread","x":1050,"y":760,"wires":[]},{"id":"88b6b5a7.2d1f18","type":"ui_text","z":"76b24d87.ec5044","group":"d39522ba.25c8c","order":2,"width":0,"height":0,"name":"","label":"Valor Actual","format":"{{msg.payload}}","layout":"row-spread","x":1050,"y":840,"wires":[]},{"id":"c82ce5ec.4b1328","type":"ui_text","z":"76b24d87.ec5044","group":"d39522ba.25c8c","order":4,"width":0,"height":0,"name":"","label":"Valor Actual","format":"{{msg.payload}}","layout":"row-spread","x":1050,"y":920,"wires":[]},{"id":"a00b453a.872708","type":"ui_text","z":"76b24d87.ec5044","group":"fa8e6d15.05415","order":2,"width":0,"height":0,"name":"","label":"Valor Actual","format":"{{msg.payload}}","layout":"row-spread","x":1050,"y":1000,"wires":[]},{"id":"42b37eb2.90d9f","type":"ui_text","z":"76b24d87.ec5044","group":"fa8e6d15.05415","order":4,"width":0,"height":0,"name":"","label":"Valor Actual","format":"{{msg.payload}}","layout":"row-spread","x":1050,"y":1080,"wires":[]},{"id":"ca350b34.e2b658","type":"ui_dropdown","z":"76b24d87.ec5044","name":"","label":"","place":"Select option","group":"dc5d1fb.b5cb6e","order":0,"width":0,"height":0,"passthru":true,"options":[{"label":"Arenas","value":1,"type":"num"},{"label":"Fomet D3 Proceso","value":"2","type":"str"}],"payload":"","topic":"","x":120,"y":80,"wires":[["ed909981.e17ae8","905b13ae.75abe"]]},{"id":"3900a0b6.cd748","type":"function","z":"76b24d87.ec5044","name":"Arenas","func":"if (msg.payload == 1) {\n   \n    msg.payload = {\"group\":{\"hide\":[\"Fund._Planta_2_temp_p2\"],\"show\":[\"Fund._Planta_2_arcilla_p2\",\"Fund._Planta_2_compactabilidad_p2\",\"Fund._Planta_2_resistencia_p2\",\"Fund._Planta_2_humedo_p2\",\"Fund._Planta_2_premezcla_p2\"]}};\n    return [msg];\n}\nreturn null;","outputs":1,"noerr":0,"x":380,"y":60,"wires":[[]]},{"id":"6516cdf7.c79a94","type":"function","z":"76b24d87.ec5044","name":"Fomet Operacion","func":"\nreturn msg;","outputs":1,"noerr":0,"x":410,"y":180,"wires":[[]]},{"id":"ed909981.e17ae8","type":"function","z":"76b24d87.ec5044","name":"Fomet Proceso","func":"if (msg.payload == 2) {\n   \n    msg.payload = {\"group\":{\"hide\":[\"Fund._Planta_2_arcilla_p2\",\"Fund._Planta_2_compactabilidad_p2\",\"Fund._Planta_2_resistencia_p2\",\"Fund._Planta_2_humedo_p2\",\"Fund._Planta_2_premezcla_p2\",\"Fund._Planta_2_Group_8\",\"Fund._Planta_2_template_p2\",],\"show\":[\"Fund._Planta_2_temp_p2\"]}};\n    return [msg];\n}\nreturn null;","outputs":1,"noerr":0,"x":400,"y":100,"wires":[["c9b03879.a91078"]]},{"id":"c9b03879.a91078","type":"ui_ui_control","z":"76b24d87.ec5044","name":"","x":660,"y":80,"wires":[[]]},{"id":"31e28c2c.a6b644","type":"function","z":"76b24d87.ec5044","name":"setDISA","func":"msg.payload = { objFecha: \"04/10/2018\", objDisa: \"2\" };\nmsg.headers = {'content-type':'application/x-www-form-urlencoded'};\nmsg.url = \"https://rassinifrenos.com/ediRassini/IOT.edi/wsRepLinea/getTmpHeraeus.r\"\n\nreturn msg;","outputs":1,"noerr":0,"x":1660,"y":160,"wires":[["e89cfd00.d55af"]]},{"id":"e89cfd00.d55af","type":"http request","z":"76b24d87.ec5044","name":"","method":"POST","ret":"txt","url":"","tls":"","x":1650,"y":200,"wires":[["f161396e.263978"]]},{"id":"f161396e.263978","type":"json","z":"76b24d87.ec5044","name":"","property":"payload","action":"","pretty":false,"x":1670,"y":240,"wires":[["b08dde76.bead7","255cd520.5aeaaa"]]},{"id":"b08dde76.bead7","type":"function","z":"76b24d87.ec5044","name":"temperatura","func":"var x = {payload:msg.payload.ttHeraeus[2].ttTmp};\n/*var lim={};\n//lim.payload = 8;\nlim.topic='limite';\nvar sup={};\nsup.payload = 8.8;\nsup.topic='sup';*/\nreturn [x];","outputs":1,"noerr":0,"x":1650,"y":280,"wires":[["11670928.551da7","b08c454e.208c68"]]},{"id":"11670928.551da7","type":"ui_chart","z":"76b24d87.ec5044","name":"","group":"be7ec636.6b1908","order":0,"width":"6","height":"6","label":"Temperatura D3","chartType":"line","legend":"false","xformat":"HH:mm:ss","interpolate":"linear","nodata":"","dot":false,"ymin":"","ymax":"","removeOlder":"12","removeOlderPoints":"","removeOlderUnit":"3600","cutout":0,"useOneColor":false,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#98df8a","#d62728","#ff9896","#9467bd","#c5b0d5"],"useOldStyle":false,"x":1640,"y":320,"wires":[[],[]]},{"id":"1b40c94c.517f17","type":"inject","z":"76b24d87.ec5044","name":"","topic":"","payload":"","payloadType":"date","repeat":"10","crontab":"","once":false,"onceDelay":0.1,"x":1650,"y":120,"wires":[["31e28c2c.a6b644"]]},{"id":"b08c454e.208c68","type":"ui_gauge","z":"76b24d87.ec5044","name":"","group":"be7ec636.6b1908","order":0,"width":0,"height":0,"gtype":"gage","title":"Temperatura","label":"units","format":"{{value}}","min":"900","max":"1600","colors":["#00b500","#e6e600","#ca3838"],"seg1":"","seg2":"","x":1670,"y":360,"wires":[]},{"id":"455b3169.8b458","type":"comment","z":"76b24d87.ec5044","name":"Temmperatura Disa D4 p2","info":"","x":1650,"y":80,"wires":[]},{"id":"255cd520.5aeaaa","type":"debug","z":"76b24d87.ec5044","name":"","active":false,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":1910,"y":220,"wires":[]},{"id":"c629b6af.f9bc38","type":"ui_switch","z":"76b24d87.ec5044","name":"","label":"mas informacion","group":"5c723f4a.f0473","order":1,"width":0,"height":0,"passthru":true,"decouple":"false","topic":"","style":"","onvalue":"true","onvalueType":"bool","onicon":"","oncolor":"","offvalue":"false","offvalueType":"bool","officon":"","offcolor":"","x":120,"y":280,"wires":[["5ca8622d.64b0ac","53c9927d.86109c","ca350b34.e2b658"]]},{"id":"5ca8622d.64b0ac","type":"function","z":"76b24d87.ec5044","name":"info","func":"var info={};\ninfo.payload= msg.payload;\nflow.set('info', info.payload);\nreturn info;","outputs":1,"noerr":0,"x":150,"y":340,"wires":[[]]},{"id":"53c9927d.86109c","type":"change","z":"76b24d87.ec5044","name":"","rules":[{"t":"change","p":"payload","pt":"msg","from":"false","fromt":"bool","to":"true","tot":"bool"}],"action":"","property":"","from":"","to":"","reg":false,"x":140,"y":240,"wires":[["ca350b34.e2b658"]]},{"id":"905b13ae.75abe","type":"function","z":"76b24d87.ec5044","name":"Arenas","func":"var inf = {};\ninf.payload=flow.get('info');\nif (msg.payload == 1) {\n   if (inf.payload===false) {\n   \n    msg.payload = {\"group\":{\"hide\":[\"Fund._Planta_2_arcilla_p2\",\"Fund._Planta_2_compactabilidad_p2\",\"Fund._Planta_2_resistencia_p2\",\"Fund._Planta_2_humedo_p2\",\"Fund._Planta_2_premezcla_p2\",\"Fund._Planta_2_temp_p2\"],\"show\":[\"Fund._Planta_2_Group_8\",\"Fund._Planta_2_template_p2\",\"Fund._Planta_2_Group_6\"]}};\n    return [msg];\n       \n   }\n\nif (inf.payload===true) {\n\n    msg.payload = {\"group\":{\"hide\":[\"Fund._Planta_2_temp_p2\",\"Fund._Planta_2_template_p2\",\"Fund._Planta_2_temp_p2\"],\"show\":[\"Fund._Planta_2_arcilla_p2\",\"Fund._Planta_2_compactabilidad_p2\",\"Fund._Planta_2_resistencia_p2\",\"Fund._Planta_2_humedo_p2\",\"Fund._Planta_2_premezcla_p2\",\"Fund._Planta_2_Group_8\",\"Fund._Planta_2_Group_6\"]}};\n    return [msg];\n    \n}\n}\nreturn null;","outputs":1,"noerr":0,"x":380,"y":140,"wires":[["c9b03879.a91078"]]},{"id":"9a0a153f.ec88e8","type":"function","z":"76b24d87.ec5044","name":"","func":"var color = new Object({});\ncolor.arcilla=flow.get('stat1');\ncolor.humedad=flow.get('stat2');\ncolor.compactabilidad=flow.get('stat3');\ncolor.temperatura=flow.get('stat4');\ncolor.resistencia=flow.get('stat5');\ncolor.permeabilidad=flow.get('stat6');\ncolor.tension=flow.get('stat7');\ncolor.arena=flow.get('stat8');\ncolor.premezcla=flow.get('stat9');\ncolor.agua=flow.get('stat10');\nmsg.payload = color;\nreturn msg;","outputs":1,"noerr":0,"x":350,"y":980,"wires":[["2187d9ee.931226"]]},{"id":"2187d9ee.931226","type":"ui_template","z":"76b24d87.ec5044","group":"6aeccfbc.1207b","name":"estado","order":1,"width":"15","height":"10","format":"<style>\n .filled { \n      height: 100% !important;\n\n      padding: 0 !important;\n      margin: 0 !important;\n  }\n\n.led {\n float: right;\n padding: 20px;\n width: 220px;\n height: 15px;\n margin: 10px 10px 10px 10px;\n border-radius: 5%;\n \n}\n</style>\n\n<table>\n    <thead>\n        <tr>\n            <th colspan=\"2\"><h1 > Estado de la Variable</h1> </th>\n           \n        \n        </tr>\n    </thead>\n    <tbody>\n    <tr>\n        \n        <td><span class=\"led\" \"filled\" style=\"background-color: {{msg.payload.arcilla}}; box-shadow: black 0 -1px 1px 0px\"><p><h2>Arcilla</h2></p></span></td>\n  \n          <td><span class=\"led\" style=\"background-color:{{msg.payload.humedad}}; box-shadow: black 0 -1px 1px 0px\"><p><h2>Humedad</h2></p></span></td>\n</tr>\n \n  <tr>\n        \n        <td><span class=\"led\" style=\"background-color: {{msg.payload.compactabilidad}}; box-shadow: black 0 -1px 1px 0px\"><p ><h2>Compactabilidad</h2></p></span></td>\n \n         <td><span class=\"led\" style=\"background-color: {{msg.payload.temperatura}}; box-shadow: black 0 -1px 1px 0px\"><p ><h2>Temperatura</h2></p></span></td>\n </tr>\n  \n  <tr>\n        \n        <td><span class=\"led\" style=\"background-color: {{msg.payload.resistencia}}; box-shadow: black 0 -1px 1px 0px\"><p ><h2>Resistencia mínima</h2></p></span></td>\n  \n          <td><span class=\"led\" style=\"background-color: {{msg.payload.permeabilidad}}; box-shadow: black 0 -1px 1px 0px\"><p ><h2>Permeabilidad</h2></p></span></td>\n</tr>\n  <tr>\n        \n         <td><span class=\"led\" style=\"background-color: {{msg.payload.tension}}; box-shadow: black 0 -1px 1px 0px\"><p ><h4>Resistencia a la Tensión</h4></p></span></td>\n         <td><span class=\"led\" style=\"background-color: blue; box-shadow: black 0 -1px 1px 0px\"><p ><h3>Agua = {{msg.payload.agua}} Lts </h3></p></span></td>\n\n  </tr>\n <tr>\n        \n         <td><span class=\"led\" style=\"background-color: blue; box-shadow: black 0 -1px 1px 0px\"><p ><h3>Arena nueva = {{msg.payload.arena}} Kg </h3></p></span></td>\n         <td><span class=\"led\" style=\"background-color: blue; box-shadow: black 0 -1px 1px 0px\"><p ><h3>Premezcla = {{msg.payload.premezcla}} Kg </h3></p></span></td>\n\n  </tr>\n  \n  \n    </tbody>\n    \n    \n</table>\n\n\n\n\n\n\n   \n\n","storeOutMessages":true,"fwdInMessages":true,"templateScope":"local","x":470,"y":980,"wires":[[]]},{"id":"7b2c4e22.97e6b","type":"ui_group","z":"","name":"arcilla p2","tab":"b75f4e6c.b20e9","order":2,"disp":false,"width":"6","collapse":false},{"id":"25d8c313.225b3c","type":"ui_group","z":"","name":"compactabilidad p2","tab":"b75f4e6c.b20e9","order":3,"disp":false,"width":"6","collapse":false},{"id":"9ab8e559.336708","type":"ui_group","z":"","name":"resistencia p2","tab":"b75f4e6c.b20e9","order":4,"disp":false,"width":"6","collapse":false},{"id":"d39522ba.25c8c","type":"ui_group","z":"","name":"humedo p2","tab":"b75f4e6c.b20e9","order":5,"disp":false,"width":"6","collapse":false},{"id":"fa8e6d15.05415","type":"ui_group","z":"","name":"premezcla p2","tab":"b75f4e6c.b20e9","order":6,"disp":false,"width":"6","collapse":false},{"id":"dc5d1fb.b5cb6e","type":"ui_group","z":"","name":"Group 6","tab":"b75f4e6c.b20e9","order":1,"disp":false,"width":"6","collapse":false},{"id":"be7ec636.6b1908","type":"ui_group","z":"","name":"temp p2","tab":"b75f4e6c.b20e9","order":7,"disp":false,"width":"6","collapse":false},{"id":"5c723f4a.f0473","type":"ui_group","z":"","name":"Group 8","tab":"b75f4e6c.b20e9","order":9,"disp":false,"width":"6","collapse":false},{"id":"6aeccfbc.1207b","type":"ui_group","z":"","name":"template p2","tab":"b75f4e6c.b20e9","order":8,"disp":false,"width":"15","collapse":false},{"id":"b75f4e6c.b20e9","type":"ui_tab","z":"","name":"Fund. Planta 2","icon":"dashboard","order":6}]

here is how the message looks

6

I can't guess what is in that... will need some form of random number / data generator to make it work.. Also the drop down only seems to shrink things to "Temperature D3) group only and never switches back.

I have same issue, when I go to the tab:

  1. I need to press "F5" to reload the page, otherwise I cannot see any item in dropdown.
  2. After I see dropdown and select a chart, the chart will show up but no data unless I reload the page again.
    I use "degug" node and see most of the time "ui_control" send msg.payload = "lost", and wait I press "F5" msg.payload turn to "connect". Why the page will "lost" unless reload? Please help. Here is my sample code:
[{"id":"277465dd.a2473a","type":"tab","label":"Flow 2","disabled":false,"info":""},{"id":"3221f63e.3df57a","type":"inject","z":"277465dd.a2473a","name":"","topic":"","payload":"","payloadType":"str","repeat":"","crontab":"","once":true,"onceDelay":0.1,"x":130,"y":120,"wires":[["67aa9821.3b56e8"]]},{"id":"67aa9821.3b56e8","type":"function","z":"277465dd.a2473a","name":"create option items","func":"var item=[];\nfor(i=1;i<=3;i++)\n    item[i] = i;\nreturn {options:item};","outputs":1,"noerr":0,"x":380,"y":120,"wires":[["125de066.4c012"]]},{"id":"125de066.4c012","type":"ui_dropdown","z":"277465dd.a2473a","name":"","label":"","tooltip":"","place":"Select option","group":"84f788f9.e92e58","order":0,"width":0,"height":0,"passthru":true,"options":[],"payload":"","topic":"","x":580,"y":120,"wires":[["9df202ab.dfee4","882c7653.d49a08"]]},{"id":"3bd5bef4.33a9d2","type":"ui_chart","z":"277465dd.a2473a","name":"","group":"b4cb882a.a59d68","order":1,"width":"18","height":"6","label":"Port 1","chartType":"line","legend":"false","xformat":"mm:ss","interpolate":"linear","nodata":"","dot":false,"ymin":"0","ymax":"3.5","removeOlder":"10","removeOlderPoints":"","removeOlderUnit":"60","cutout":0,"useOneColor":false,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#00ff40","#d62728","#ff9896","#9467bd","#c5b0d5"],"useOldStyle":true,"x":330,"y":260,"wires":[[],[]]},{"id":"dd1ea9ce.af0c38","type":"ui_chart","z":"277465dd.a2473a","name":"","group":"fe75d78.cd9be28","order":1,"width":"18","height":"6","label":"Port 2","chartType":"line","legend":"false","xformat":"mm:ss","interpolate":"linear","nodata":"","dot":false,"ymin":"0","ymax":"3.5","removeOlder":"10","removeOlderPoints":"","removeOlderUnit":"60","cutout":0,"useOneColor":false,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#00ff40","#d62728","#ff9896","#9467bd","#c5b0d5"],"useOldStyle":true,"x":330,"y":280,"wires":[[],[]]},{"id":"f3c3002a.1d058","type":"ui_chart","z":"277465dd.a2473a","name":"","group":"82aafa89.5a3a18","order":1,"width":"18","height":"6","label":"Port 3","chartType":"line","legend":"false","xformat":"mm:ss","interpolate":"linear","nodata":"","dot":false,"ymin":"0","ymax":"3.5","removeOlder":"10","removeOlderPoints":"","removeOlderUnit":"60","cutout":0,"useOneColor":false,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#00ff40","#d62728","#ff9896","#9467bd","#c5b0d5"],"useOldStyle":true,"x":330,"y":300,"wires":[[],[]]},{"id":"9df202ab.dfee4","type":"function","z":"277465dd.a2473a","name":"display selected chart","func":"var SelectPort = parseInt(msg.payload);\nvar hideStr=[];\nvar showStr=[];\nvar msgGroup={group:{}};\nfor (i=1;i<=3;i++){\n    if (SelectPort!==i)\n        hideStr.push(\"DropdownTest_port\"+i);\n    else\n        showStr.push(\"DropdownTest_port\"+i);\n}\nmsgGroup.group.hide = hideStr;\nmsgGroup.group.show = showStr;\nmsgGroup.group.focus = true;\nmsg.payload = msgGroup;\nmsg.tab = \"\";\nreturn msg;","outputs":1,"noerr":0,"x":160,"y":180,"wires":[["6bc69235.c586cc","a2aeb24.bff295"]]},{"id":"6bc69235.c586cc","type":"ui_ui_control","z":"277465dd.a2473a","name":"","x":420,"y":180,"wires":[[]]},{"id":"33b6300a.c989e","type":"inject","z":"277465dd.a2473a","name":"","topic":"","payload":"","payloadType":"date","repeat":"1","crontab":"","once":true,"onceDelay":0.1,"x":130,"y":220,"wires":[["e6c3b6ee.dbdf08"]]},{"id":"e6c3b6ee.dbdf08","type":"function","z":"277465dd.a2473a","name":"Rnd number generator","func":"rnd = Math.round(Math.random() * (3.5-0.0)+0.0);\nmsg.payload = rnd;\nreturn msg;","outputs":1,"noerr":0,"x":140,"y":280,"wires":[["3bd5bef4.33a9d2","dd1ea9ce.af0c38","f3c3002a.1d058"]]},{"id":"a2aeb24.bff295","type":"debug","z":"277465dd.a2473a","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":440,"y":220,"wires":[]},{"id":"882c7653.d49a08","type":"debug","z":"277465dd.a2473a","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":650,"y":220,"wires":[]},{"id":"84f788f9.e92e58","type":"ui_group","z":"","name":"Default","tab":"bb178844.f24848","disp":true,"width":"6","collapse":false},{"id":"b4cb882a.a59d68","type":"ui_group","z":"","name":"port1","tab":"bb178844.f24848","disp":true,"width":"20","collapse":false},{"id":"fe75d78.cd9be28","type":"ui_group","z":"","name":"port2","tab":"bb178844.f24848","disp":true,"width":"20","collapse":false},{"id":"82aafa89.5a3a18","type":"ui_group","z":"","name":"port3","tab":"bb178844.f24848","disp":true,"width":"20","collapse":false},{"id":"bb178844.f24848","type":"ui_tab","z":"","name":"DropdownTest","icon":"dashboard","disabled":false,"hidden":false}]

what platform and OS are you running on ? Which browser ? and which versions of node.js, Node-RED and node-red-dashboard (printed in the startup log).
Your flow works nicely for me in Chrome on Node-RED 0.19.5 and dashboard 2.13.2

Sorry, I didn't see your reply. I am using Windows 10 (Windows_NT 10.0.17134 x64 LE) as OS and Node.js version: v10.14.0, Node-RED version: v0.19.5, Dashboard 2.13.2, Chrome ( 72.0.3626.109 x64) as browser and it happened for IE on desktop, chrome on phone...as well. However, I cannot solve this problem so far.

The first example has only 3 ports, I found it won't have the problem.
then I made an example exactly as same number of ports as my program (20 ports),
the problem still not show up, until I change 20 chart width from 6 to 18, the problem was duplicated. please see the example as below:

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hideStr=[];\nvar showStr=[];\nvar msgGroup={group:{}};\nfor (i=1;i<=20;i++){\n    if (SelectPort!==i)\n        hideStr.push(\"test_port\"+i);\n    else\n        showStr.push(\"test_port\"+i);\n}\nmsgGroup.group.hide = hideStr;\nmsgGroup.group.show = showStr;\nmsgGroup.group.focus = true;\nmsg.payload = msgGroup;\nmsg.tab = \"\";\nreturn msg;","outputs":1,"noerr":0,"x":160,"y":180,"wires":[["281c1af3.fcef36","e0fa99fe.0f0bd8"]]},{"id":"281c1af3.fcef36","type":"ui_ui_control","z":"11af8890.7bdd97","name":"","x":420,"y":180,"wires":[[]]},{"id":"3b8ef1a6.d3649e","type":"inject","z":"11af8890.7bdd97","name":"","topic":"","payload":"","payloadType":"date","repeat":"1","crontab":"","once":true,"onceDelay":0.1,"x":130,"y":220,"wires":[["258c646d.17818c"]]},{"id":"258c646d.17818c","type":"function","z":"11af8890.7bdd97","name":"Rnd number generator","func":"rnd = Math.round(Math.random() * (3.5-0.0)+0.0);\nmsg.payload = rnd;\nreturn msg;","outputs":1,"noerr":0,"x":140,"y":280,"wires":[["54973e0a.3ede7","ecd6b8f3.6b68f8","31494105.15d57e","9824e28b.dec69","98ae9663.ee1458","3ea1107d.1828d","1da23778.3e2289","e6ee158b.f357e8","c3bb0472.2afb18","d379c3ec.86075","b1efbb83.5bccf8","dae62ca0.0c1af","411cd254.e9c51c","c01590b8.1e319","fa0376f6.1ae5c8","f1a1df97.7ca7e","1d7ae42e.93165c","6394c91f.3b74c8","6eb05021.4dd4a","75a47ef1.8c1e"]]},{"id":"e0fa99fe.0f0bd8","type":"debug","z":"11af8890.7bdd97","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":430,"y":240,"wires":[]},{"id":"64c7cd43.fddcd4","type":"debug","z":"11af8890.7bdd97","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":650,"y":220,"wires":[]},{"id":"54973e0a.3ede7","type":"ui_chart","z":"11af8890.7bdd97","name":"","group":"7a6799cd.49d7b8","order":1,"width":"18","height":"6","label":"Port 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4","chartType":"line","legend":"false","xformat":"mm:ss","interpolate":"linear","nodata":"","dot":false,"ymin":"0","ymax":"3.5","removeOlder":"10","removeOlderPoints":"","removeOlderUnit":"60","cutout":0,"useOneColor":false,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#00ff40","#d62728","#ff9896","#9467bd","#c5b0d5"],"useOldStyle":true,"x":310,"y":380,"wires":[[],[]]},{"id":"98ae9663.ee1458","type":"ui_chart","z":"11af8890.7bdd97","name":"","group":"637adb1.0a5bf24","order":1,"width":"18","height":"6","label":"Port 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9","chartType":"line","legend":"false","xformat":"mm:ss","interpolate":"linear","nodata":"","dot":false,"ymin":"0","ymax":"3.5","removeOlder":"10","removeOlderPoints":"","removeOlderUnit":"60","cutout":0,"useOneColor":false,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#00ff40","#d62728","#ff9896","#9467bd","#c5b0d5"],"useOldStyle":true,"x":310,"y":480,"wires":[[],[]]},{"id":"d379c3ec.86075","type":"ui_chart","z":"11af8890.7bdd97","name":"","group":"549300cd.b5ff1","order":1,"width":"18","height":"6","label":"Port 10","chartType":"line","legend":"false","xformat":"mm:ss","interpolate":"linear","nodata":"","dot":false,"ymin":"0","ymax":"3.5","removeOlder":"10","removeOlderPoints":"","removeOlderUnit":"60","cutout":0,"useOneColor":false,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#00ff40","#d62728","#ff9896","#9467bd","#c5b0d5"],"useOldStyle":true,"x":320,"y":500,"wires":[[],[]]},{"id":"b1efbb83.5bccf8","type":"ui_chart","z":"11af8890.7bdd97","name":"","group":"cde08955.b653b8","order":1,"width":"18","height":"6","label":"Port 11","chartType":"line","legend":"false","xformat":"mm:ss","interpolate":"linear","nodata":"","dot":false,"ymin":"0","ymax":"3.5","removeOlder":"10","removeOlderPoints":"","removeOlderUnit":"60","cutout":0,"useOneColor":false,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#00ff40","#d62728","#ff9896","#9467bd","#c5b0d5"],"useOldStyle":true,"x":480,"y":320,"wires":[[],[]]},{"id":"dae62ca0.0c1af","type":"ui_chart","z":"11af8890.7bdd97","name":"","group":"210c4e29.398ca2","order":1,"width":"18","height":"6","label":"Port 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19","chartType":"line","legend":"false","xformat":"mm:ss","interpolate":"linear","nodata":"","dot":false,"ymin":"0","ymax":"3.5","removeOlder":"10","removeOlderPoints":"","removeOlderUnit":"60","cutout":0,"useOneColor":false,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#00ff40","#d62728","#ff9896","#9467bd","#c5b0d5"],"useOldStyle":true,"x":480,"y":480,"wires":[[],[]]},{"id":"75a47ef1.8c1e","type":"ui_chart","z":"11af8890.7bdd97","name":"","group":"a436bc5d.22c58","order":1,"width":"18","height":"6","label":"Port 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and I found if I wait for 10 secs, the chart will show curve without F5 (reload), that is, the chart will delay for a while to show because of the "width" of charts.

Hi , I'm not sure what you mean exactly - the flow you posted works as I would expect. Once you inject the dropdown you can select any of the charts, and you can then see live data from then on. You are playing with 600 points (one per second for 10 mins) across 20 charts = 12000 data updates which may get quite slow on a slow device.

Thank you for your reply, yes, I guess the reason might be slow device. I'll try to improve my hardware spec. Thank you.