UI dropdown - Unable to set a preselected option

[giuseppeg88]

What are the steps to reproduce?

Send a msg (with a string in msg.payload) to a dropdown node.

What do you expect to happen & what happens?

Until the release 1.2.5, the dropdown node was correctly updated with the text contained in the received payload.
With the new release (1.2.7) this does not happen.

Please tell us about your environment:

• Node-RED version: 1.2.7
• Platform/OS: Windows 10
• Browser: Chrome 88.0.4324.104

[dceejay]

Sorry - I don't think I understand the problem correctly - A simple test like this works for me

[{"id":"6ef8490f.9cb1b8","type":"inject","z":"78444ab3.45a654","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"b","payloadType":"str","x":120,"y":900,"wires":[["ed6105a4.0d3598"]]},{"id":"ed6105a4.0d3598","type":"ui_dropdown","z":"78444ab3.45a654","name":"","label":"","tooltip":"","place":"Select option","group":"a223b12f.6e05a","order":1,"width":0,"height":0,"passthru":true,"multiple":false,"options":[{"label":"A","value":"a","type":"str"},{"label":"B","value":"b","type":"str"},{"label":"C","value":"c","type":"str"}],"payload":"","topic":"","x":290,"y":900,"wires":[["3aabe573.2b246a"]]},{"id":"3aabe573.2b246a","type":"debug","z":"78444ab3.45a654","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":470,"y":900,"wires":[]},{"id":"a223b12f.6e05a","type":"ui_group","name":"Default","tab":"45c56a9a.0646c4","order":1,"disp":true,"width":"6","collapse":false},{"id":"45c56a9a.0646c4","type":"ui_tab","name":"Home","icon":"dashboard","disabled":false,"hidden":false}]

Can you share a simple example that shows your actual issue ?
Thanks

[giuseppeg88]

Hi, I've just tried your flow: it stops working if you turn off the option "If msg arrives on input, pass through to output".

[{"id":"68e6f8c8.ddd598","type":"tab","label":"Flow 3","disabled":false,"info":""},{"id":"ed6105a4.0d3598","type":"ui_dropdown","z":"68e6f8c8.ddd598","name":"","label":"","tooltip":"","place":"Select option","group":"a223b12f.6e05a","order":1,"width":0,"height":0,"passthru":false,"multiple":false,"options":[{"label":"A","value":"a","type":"str"},{"label":"B","value":"b","type":"str"},{"label":"C","value":"c","type":"str"}],"payload":"","topic":"","x":400,"y":240,"wires":[["3aabe573.2b246a"]]},{"id":"3aabe573.2b246a","type":"debug","z":"68e6f8c8.ddd598","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":580,"y":240,"wires":[]},{"id":"6ef8490f.9cb1b8","type":"inject","z":"68e6f8c8.ddd598","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"b","payloadType":"str","x":230,"y":240,"wires":[["ed6105a4.0d3598"]]},{"id":"a223b12f.6e05a","type":"ui_group","name":"Default","tab":"45c56a9a.0646c4","order":1,"disp":true,"width":"6","collapse":false},{"id":"45c56a9a.0646c4","type":"ui_tab","name":"Home","icon":"dashboard","order":1,"disabled":false,"hidden":false}]

Thanks

[dceejay]

indeed - if the message doesn't pass through then it won't set the selected option.

[giuseppeg88]

But the intent is not to send over the message but only to update the UI.
The use case is, for example, when you want to align the selected element to a state setted by an external factor.

Until the previous release it worked in this way and, in fact, the documentation doesn't say that the "pass through" must be enabled in order to update the UI.

[dceejay]

true - looking at it now.
(update: Have found the offending line... not sure why it got added... must have been for a reason... so now need to check past test cases)

[number005]

As this is closed I guess its solved from 2.28.0 on? Right?

[knolleary]

@number005 yes. The commit that closed this issue was included in 2.28