# Property() Expression Function

**URL:** <https://forum.inductiveautomation.com/t/property-expression-function/49376>\
**Category:** Ignition\
**Tags:** ignition81, perspective\
**Created:** [July 29, 2021, 9:28pm UTC](https://forum.inductiveautomation.com/t/property-expression-function/49376 "2021-07-29T21:28:30Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![michael2](https://avatars.discourse-cdn.com/v4/letter/m/3e96dc/32.png) [@michael2](https://forum.inductiveautomation.com/u/michael2)\
**Post date:** [July 30, 2021, 1:54am UTC](https://forum.inductiveautomation.com/t/property-expression-function/49376/4 "2021-07-30T01:54:13Z")

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The only drawback I can think of is that it isn't possible to make it bidirectional using the expression function, but I don't know why it isn't possible to make property bindings work in the same way as tag bindings:

> [@\[FEATURE\] Perspective - Add functions to read/write custom session props via script](https://forum.inductiveautomation.com/t/feature-perspective-add-functions-to-read-write-custom-session-props-via-script/48806/4):
>
> Yes flex repeater, I also ran into the same issue of forgetting it existed, and searching the forums to find a post from myself a few months ago. And yes, bidirectional most importantly

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