# Dropdown Events and Dynamic View Size

**URL:** <https://forum.inductiveautomation.com/t/dropdown-events-and-dynamic-view-size/77164>\
**Category:** Ignition\
**Tags:** perspective\
**Created:** [July 31, 2023, 6:06pm UTC](https://forum.inductiveautomation.com/t/dropdown-events-and-dynamic-view-size/77164 "2023-07-31T18:06:01Z")\
**Posts on this page:** 1\
**Showing post:** 8

<div class="post-metadata">

**Author:** ![Transistor](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/transistor/32/3380_2.png) [@Transistor](https://forum.inductiveautomation.com/u/Transistor)\
**Post date:** [July 31, 2023, 7:44pm UTC](https://forum.inductiveautomation.com/t/dropdown-events-and-dynamic-view-size/77164/8 "2023-07-31T19:44:21Z")

</div>

I needed a filter on a tree so I did this:

- Add a text field above the tree, `txtFilter`.
- I have a binding on the tree's `items` property. In my case the tree is generated from a named query and the query has a parameter,  
`'%' + {../flexFilter/txtFilter.props.text} + '%'

See some of my other posts:

> [@Altering Tree in Perspective Module](https://forum.inductiveautomation.com/t/altering-tree-in-perspective-module/65325/2):
>
> I wouldn't think it's possible easily. What I've done was add a small flex container above the tree with a handy filter and a + button and only enable the button if a valid selection is made on the tree. Operation is easily understood by the users.

---

_[View the full topic](https://forum.inductiveautomation.com/t/dropdown-events-and-dynamic-view-size/77164)._