Unable to update text field on just one session using msg.socketid

Dashboard
1

I thought I should be able to update a text or text input field in just one of the connected sessions by including msg.socketid but I cannot get it to work.

I am using a ui_control node to detect the opening of a dashboard tab and then passing that message on to the text nodes after adding a timestamp to msg.payload. I had expected that to only update the tab on the device that has just opened the tab, but I see that all connected devices receive the new timestamp. Should this flow operate as I expected or am I incorrect?

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[{"id":"1821b1188180a4c6","type":"ui_ui_control","z":"bdd7be38.d3b55","name":"","events":"all","x":140,"y":3100,"wires":[["50f33ee13411047e"]]},{"id":"cf55096d8fbff95b","type":"ui_text","z":"bdd7be38.d3b55","group":"903a6ab8.4f4ca8","order":3,"width":0,"height":0,"name":"","label":"ui_text","format":"{{msg.payload}}","layout":"row-spread","className":"","style":false,"font":"","fontSize":16,"color":"#000000","x":730,"y":3080,"wires":[]},{"id":"bc151026b9db7aca","type":"function","z":"bdd7be38.d3b55","name":"Add timestamp","func":"msg.payload = new Date().toISOString()\nreturn msg;","outputs":1,"timeout":0,"noerr":0,"initialize":"","finalize":"","libs":[],"x":520,"y":3100,"wires":[["cf55096d8fbff95b","ab3b4ae211852e81"]]},{"id":"ab3b4ae211852e81","type":"ui_text_input","z":"bdd7be38.d3b55","name":"","label":"ui_text_input","tooltip":"","group":"903a6ab8.4f4ca8","order":4,"width":0,"height":0,"passthru":true,"mode":"text","delay":300,"topic":"topic","sendOnBlur":true,"className":"","topicType":"msg","x":730,"y":3140,"wires":[[]]},{"id":"50f33ee13411047e","type":"switch","z":"bdd7be38.d3b55","name":"Home?","property":"name","propertyType":"msg","rules":[{"t":"eq","v":"Home","vt":"str"}],"checkall":"true","repair":false,"outputs":1,"x":300,"y":3100,"wires":[["5d460a612a21cdcd","bc151026b9db7aca"]]},{"id":"5d460a612a21cdcd","type":"debug","z":"bdd7be38.d3b55","name":"debug 116","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","statusVal":"","statusType":"auto","x":470,"y":3040,"wires":[]},{"id":"903a6ab8.4f4ca8","type":"ui_group","name":"Home","tab":"e2e6f4f5.56f91","order":1,"disp":false,"width":"6","collapse":false,"className":""},{"id":"e2e6f4f5.56f91","type":"ui_tab","name":"Home","icon":"dashboard","order":3,"disabled":false,"hidden":false}]
2

You are incorrect. There is only one source of truth. We can’t have indicators saying the power is off when it may be on.

3

Ok, it was posts like this that led me astray I think.

I am not sure it is a well defined a question as that. If the developer decided he wanted to affect only the current tab when a button is clicked, for example, there is no reason why that should not be allowed. However, if that is the way it is then that is ok. I don't actually need to do this, I was just exploring the capability with a view to the design of Dashboard 2.0.

So is it just notifications, navigation and show/hide that are affected by the socketid?

4

Correct.
At the end of the day. Until you have separate user login sessions then there can only ever be one state of a widget held in a flow. Of course the browser client can hold it own state, but then who do you trust? That is a design decision, and we (I) chose to stick with the server being the source of truth.

1 Like
5

OK, thanks.

6

The text-box node is global. whatever value it receives will show on all sessions.

You have the option to use a ui-template node and define a session-specific text box in HTML.
Messages which include a session indicator (msg.socketid), will only be received by the text box of same current session.

In case the message comes without a session indicator (e.g. comes from a non-dashboard node), you can mimic this behavior, using a hidden HTML field, initialized with a unique UUID.

I have a working example of this, in case you are interested.

1 Like
7

OK, thanks, as I said, I don't need to do this, I was just clarifying my understanding of how the current dashboard works.

8

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