Category: JS Objects

This solution is summarized from an archived support forum post. This information may have changed. If you notice an error, please let us know in Discord. is not a function


I am trying to use a custom column with a computed value function that runs a query with a filter to calculate the total of selected rows. However, I am receiving an error that is not a function. When I make the function asynchronous, the error disappears but the computed value is undefined. 

Similarly, when I try to pass parameters in an API query, I am receiving an error and following the instructions given in the documentation is not working. Switching from the forEach() method to a for loop resolves this issue.


The user was facing an error while using a custom column in a Table with Computed Value as a function they had created in a JSObject. The function was running a query with a filter to get only selected rows and perform an action, then return the total. They were getting the error " is not a function", but making the function async resulted in an undefined computed value.

The solution for this issue was to use the keyword this to access a function in the same file. So, was a valid expression to use in the computation. Additionally, the issue with running a query from a JSObject was resolved by using a for loop instead of the forEach() method and passing the parameters correctly. After these changes were made, the issues were resolved.