Download the sample project with all libraries from https://mindfusion.dev/samples/javascript/grid/BasicGridValidation.zip
The tutorial explains how to implement data validation for a given column. The code can be easily changed to apply to any type of data and validation criteria.
Learn more about MindFusion DataViews for JavaScript at https://mindfusion.dev/javascript-grid.html
Technical support is available at the forum: https://mindfusion.dev/Forum/YaBB.pl
