# Blackboard key value change

**URL:** <https://forums.unrealengine.com/t/blackboard-key-value-change/459808>\
**Category:** AI\
**Tags:** boolean, blackboard, behaviour-tree, unreal-engine, question\
**Created:** [December 22, 2019, 10:49am UTC](https://forums.unrealengine.com/t/blackboard-key-value-change/459808 "2019-12-22T10:49:58Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Philipt235](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Philipt235](https://forums.unrealengine.com/u/Philipt235)\
**Post date:** [December 22, 2019, 10:49am UTC](https://forums.unrealengine.com/t/blackboard-key-value-change/459808/1 "2019-12-22T10:49:58Z")

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![294322-help.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/6/8/c/68ce4386dcc54490fda81a1b8f5f2cacba5a6821.png)

Is it possible to change a boolean type Blackboard Key using an on clicked event?

The screenshot that is posted are the nodes that I created for the widget button. As far as I know, based on the nodes I created, Once clicked, The blackboard value should be changed to true. I know I did something wrong or I referenced the wrong nodes. I am just not sure which is which. Please help, this is for a school project. Thank you in advance

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**Author:** ![Manolochan](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Manolochan](https://forums.unrealengine.com/u/Manolochan)\
**Post date:** [July 25, 2024, 12:02am UTC](https://forums.unrealengine.com/t/blackboard-key-value-change/459808/2 "2024-07-25T00:02:00Z")

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Is there any update on this? I think I have a similar issue. My casting is failing all the time and I cannot make it work…

 ![image](https://d3kjluh73b9h9o.cloudfront.net/original/4X/f/6/1/f61d331451bd934a7e276499aed8b50c3fbfdf09.png)