Thank you for your post!
The JavaScript function 'window.showModelessDialog' can open a modal window, and its prototype was showed below:
window.showModelessDialog(sURL [, vArguments] [, sFeatures])
The sURL parameter demand for a String that specifies the URL of the document to load and display in the modal window, it will point to an .aspx or html file in usually.
So in your scenario, I think you should add an .aspx or html page to your web application for displaying the columns, and then the page can be showed with the function.
If you do not want to add such a page to your application, maybe you can display the content inside a div object above the window instead of using the modal dialog.
Feel free to post if any questions.
Thanks
Dean Deng
Lead Developer
Aspose Guangzhou Team
About UsContact Us