# How should I read from a tag in perspective?

**URL:** <https://forum.inductiveautomation.com/t/how-should-i-read-from-a-tag-in-perspective/115505>\
**Category:** Ignition\
**Tags:** perspective, ignition81\
**Created:** [May 13, 2026, 8:50am UTC](https://forum.inductiveautomation.com/t/how-should-i-read-from-a-tag-in-perspective/115505 "2026-05-13T08:50:12Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![danielps1818](https://avatars.discourse-cdn.com/v4/letter/d/ecae2f/32.png) [@danielps1818](https://forum.inductiveautomation.com/u/danielps1818)\
**Post date:** [May 13, 2026, 8:50am UTC](https://forum.inductiveautomation.com/t/how-should-i-read-from-a-tag-in-perspective/115505/1 "2026-05-13T08:50:12Z")

</div>

I have a view with an input param called `path`.

For that view I need to display the path with a property that is inside the path.

Let me give an example:  
If `path` is `[default]folder1/folder2/folder3`  
The property that I need is `[default]folder1/folder2/folder3/id`.  
Then I get the value from `path` and the value from `id` and display it together.  
Like this: `[default]folder1/folder2/folder3/D-IA-001` (for example)

I could think of 3 ways of doing this. I'm looking what is the **best way** or the intended way.

1. **Indirect binding**  
I create a custom property with the indirect tag. Like this: `{view.params.path}/id`. This would return the value of `id`.  
Then in another custom propery I create an expression binding. Like this: `{view.params.path} + "/" + {view.custom.id}`

2. **system.tag.readBlocking()**  
I create a custom property with a binding to `{view.params.path}`. Then I create a transform script with a code that look like this:

```python
id = system.tag.readBlocking(value)
if id.quality.isGood():
    return value + "/" + id.value
return "ERROR"

```

1. **tag() expression**  
I create a custom property with an expression structure.  
Inside I create 2 values `{view.params.path}` and the other one `tag({view.params.path} + "/id")`  
Then I simply combine the 2.  
However, I belive that the use of `tag()` is not recommended.

I'm asking this because we have a flex repeater that generates about 20-30 views that need this data. We are having loading problems and we are trying to understand why.

Any help or tip is appreciated.

Thx!

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<div class="post-metadata">

**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [May 13, 2026, 11:19am UTC](https://forum.inductiveautomation.com/t/how-should-i-read-from-a-tag-in-perspective/115505/2 "2026-05-13T11:19:55Z")

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Use #1 if you need the displayed value to be "live". Place the indirect binding **inside** the repeating view.

Use #2 if you want the displayed value to be a snapshot from when the view opens.

Never use #3 in user interfaces.