```
* 
Viewing 5 replies - 1 through 5 (of 5 total)
* Plugin Author [SilkyPress](https://wordpress.org/support/users/diana_burduja/)
* (@diana_burduja)
* [12 months ago](https://wordpress.org/support/topic/uncaught-referenceerror-function-is-not-defined/#post-18486381)
* Hello [@sergio2019wa](https://wordpress.org/support/users/sergio2019wa/),
* I didn’t manage to replicate the “handleSelection is not defined” error message
on my test website, even if I copy/pasted the exact JS and HTML code from your
example.
* Here is what I did:
1. Added a Custom JS Code with the plugin, together with a “console.log” line,
so I can see the value change in the select. See [this screenshot](https://imgur.com/ig10Xc0).
2. Added the HTML as a “Custom HTML” block. See [this screenshot](https://imgur.com/ndfrtkk).
3. On the frontend changed the value of the select several times. The browser’s
console shows me correctly the “yes”, “no” or “select” values. See [this screenshot](https://imgur.com/cQ9l2F8).
* Hopefully the screenshots help you find out what you were doing wrong.
* Thread Starter [sergio2019wa](https://wordpress.org/support/users/sergio2019wa/)
* (@sergio2019wa)
* [12 months ago](https://wordpress.org/support/topic/uncaught-referenceerror-function-is-not-defined/#post-18487762)
* Hello SilkyPress,
* I’ve created a new Page to attempt it again. For context I’m helping an Org.
create a Landing page that uses a dropdown menu. I just now tried referencing
a different JS function that was already used before I got access to the page
and that method is also throwing a Uncaught Reference Error. I’d also like to
add that this isn’t the main page of their website. So I didn’t specify in the
JS to only work in a certain page.
1. JS code that I just added a console.log [https://imgur.com/a/sxw3WJ9](https://imgur.com/a/sxw3WJ9)
2. The html code block in new page [https://imgur.com/a/e9SsbVF](https://imgur.com/a/e9SsbVF)
3. The Error messages I get when trying to use the dropdown menu [https://imgur.com/a/3hGXCxT](https://imgur.com/a/3hGXCxT)
* Plugin Author [SilkyPress](https://wordpress.org/support/users/diana_burduja/)
* (@diana_burduja)
* [12 months ago](https://wordpress.org/support/topic/uncaught-referenceerror-function-is-not-defined/#post-18488110)
* Your last screenshot with the errors is not from a page on the frontend, but
from the block editor.
* By default the Simple Custom CSS & JS loads the custom JS code on the frontend.
You can choose to load a JS code also in the block editor by selecting the “In
Block editor” option under the “Where in site” heading from within the options
found on the right side of the editor. But that will also not make the “handleSelection”
function available within the HTLM code block. The explanation for this behavior
would take quite long and it might be a bit too technical.
* At the moment, with your current setup, the “handleSelection” function should
work alright on your frontend page.
* If you insist on making it work both in the block editor, then you might want
to move the JS code in the HTML code block, as follows:
* ```wp-block-code