Cognos 8.4 - checkData() function is not working for textbox

[midhl]

We are using a required text prompt in Cognos 8.4 report studio, we are doing some validation using javascript code. Hence we are using the below statement once the textbox is valid.

textBoxCogEid.checkData();

But we are getting the ('textBoxCogEid' is undefined) error message, I am sure this works fine in 8.2, please let me know an alternative solution in 8.4?

Thank you