In the official document, I tried to apply it to TextBox & DropDownList by referring to the update method using NumericTextBox, but it failed.
For example, if I enter "A" in the TextBox of Column A, select "B" in the DropDownList of column B, and transfer the values of column A and B to backend api, and then gets "AB"(appended value of Column A, B) from backend response and set this value on TextBox of Column C while in editing mode.
The development environment is React and JavaScript and uses hooks.