Indirect Tag-History Binding

[Maryam_Saeed]

I need help regarding this.

I have a parameter with in my view which accesses details through indirect tag binding. I want to do the same for my timeseries chart. I tried tag history method, it's not working. Any tips?

[David_Stone]

Indirect Tag History Binding in Perspective

I don’t see an option for indirect tag history binding in perspective. Am I missing something? [image]

[Maryam_Saeed]

Sparkline Dynamic Tag History Expression Binding

Hi, I would like to use a sparkline display along with my transmitter value in Perspective. My goal is to provide a tag path to the view that contains the transmitter and sparkline to make them interactive. The transmitter parameter passing works fine, but I cannot get the sparkline to work properly. According to this video, it should be possible to create a custom array of objects, with each object containing values for path, alias, and aggregate and use it in a Tag History Binding. The vi…

I came across this but my issue is a bit different. I have a vessel number and a path. Within my path I need to change my param. My values are in string format. Thus when I pass an object like this,
[
{
path:
alias:
aggregate:
}
]

my chart reads my path in string but does not read my value in string

[lrose]

Can you show how you have configured your binding, how you are generating your expression, and how you are trying to display this information?

@Maryam_Saeed

my chart reads my path in string but does not read my value in string

How do you expect a chart to display a string?

[Transistor]

Please see Wiki - how to post code on this forum.

[Chris_Bingham]

@Maryam_Saeed

Within my path I need to change my param.

The original thread by @David_Stone contains a post with a portion of the path as dynamic.
On your TimeSeriesChart component, create a custom property (an array of objects, with the structure manually built with the details of your tag(s) therein):

[
  {
    "aggregate": "LastValue",
    "alias": "PV",
    "path": null
  }
]

Then, add an expression binding to your path. Here is a binding from the aforementioned thread:
'[default]'+{view.custom.line}+'speed'
Once everything is configured to your preference, add a Tag History binding on the series[0].data object, with an Expression to Select Tags as:
{this.custom.historical} (the new property you created earlier.

Does this help? If not, screenshots of your setup would be very beneficial.

[Maryam_Saeed]

My client was in a hurry to get a solution so I opted to extract values from DB using Vessel Number Param and extracting datasets on my chart, I am still curious how to do it as Indirect binding, will defiantly try your method

[lrose]

@Maryam_Saeed

I opted to extract values from DB using Vessel Number Param

This sounds like you're manually querying Tag History Data, if that is the case, it is sure to break at some point. If that is what you're doing, I would strongly reconsider. It may work now, but eventually it will break for one reason or another, unless you're doing a lot of work to jump through partitioning hoops, which would be the opposite of "in a hurry".