Dashboards Direct - How to specify an error message on Data Grid edit failure

[jlucid]

I have a Data Grid component with Edit mode enabled, users can only update cells, not add or delete.

In my user defined update function, which upserts the users entry, I have put in some validation checks before the upsert to ensure the values are within a given range.

If the validation fails, I return an `ERROR_MESSAGE symbol, and this prompt the Dashboard to display an

error  message in Red which says "An error occurred executing the update query: Error text: t"

Is there a way for me to to replace the "t" with a message corresponding to the validation check that failed?

Thanks

[jlucid]

 If I modify my update function like below, where when the if statement is true it hits an undefined variable

"BadValueInputted" then the error message on screen just shows the first character of the missing variable, the "B", so the Error message appearing on screen is " "An error occurred executing the update query: Error text: B".

Is there a way to display the full text and not truncate?

{[dgAdd;dgUpd;dgDel]

 if[not (first dgUpd[`Current]) in 10.0 20.0;

   BadValueInputted

 ];

$[((count dgUpd)>0);`testTable upsert flip dgUpd;];

}

[jlucid · Accepted solution]

The solution I found for this problem was to open the file below

dash/www/modules/Datagrid_9fde571/main.js

And replace the line 

r=function(e){this.showMessageSubmitError(e[0])}.bind(this)     [First character being returned]

with 

r=function(e){this.showMessageSubmitError(e)}.bind(this)

Now when I submit an edit to the Data grid cell, and force the update function to fail (with a mock validation check),  the error message returning is showing the full error message. 

If someone else has a better solution please let me know