Hello Serdar,
Regarding the jseditor example you send us, have a look at this demo on how to get the position of the clicked row and set it as the position of the window:
https://jseditor.io/?key=grid-with-pop-up-window-demo
You can also have a look at our built-in row details
functionality. It allows you to expand rows and reveal any content inside the details:
https://jsfiddle.net/jqwidgets/jKPLJ/
If you have any other questions, please do not hesitate to contact us again.
Best Regards,
Ivan Peevski
jQWidgets team
https://www.jqwidgets.com