MultiColumnComboBox - Virtualization issues

[Stefan]

We're using the MultiColumnComboBoxFor with a large amount of data, and therefore implemented virtualization as is described here: https://demos.telerik.com/aspnet-mvc/multicolumncombobox/virtualization

We ran into multiple problems with this:

1. The line data: convertValues(options.value) did not work for us; the server method never received any values.
   We had to use data: { values: options.value }.
2. Empty values were not displayed correctly in the dropdown:
   
   We changed the following style to display these correctly:
   .k-grid-list.k-virtual-list > .k-item > .k-cell, .k-grid-list.k-virtual-list > .k-item > .k-group, .k-grid-list.k-virtual-list > .k-item > .k-spacer-group {   
   display: table-cell;
   }

Are there any drawbacks to our solution?

[Stefan]

Hi,

we actually ran into some issues subsequently. Our final approach has been to leave the styles in their orignial form, but insert an empty 'NO-BREAK SPACE' character in every empty cell, which resolved the issue:

.k-grid-list.k-virtual-list > .k-item > .k-cell:empty:before {
    content: '\00a0';  /* http://www.kompx.com/en/non-breaking-space-nbsp-in-before-and-after-content.htm */
}

[Ivan Danchev]

Hi Stefan,

I've tested both changes you posted and everything worked correctly, so I don't see any drawbacks in this approach.

Regards,
Ivan Danchev
Progress Telerik