Hello Manish,

Thank you for posting in our forum.

In order to be sure your question gets answered correctly, I would appreciate some additional information:

1. By “no fixed no of columns” I guess you mean that the number of columns varies and depends on some API that you get the data from, is that correct? What does the number of columns depend on?
2. What do you mean by a “dynamic” column? An unbound column, or a column that gets calculated dynamically, or something else?
3. Do you know in advance the columnKey or the index of this dynamic column? That might be important when using the Summaries feature, as it would need a key (or an index) so that it enables the summary for that specific column.
4. Which version of Ignite UI do you use?

What you describe as a custom summary is a summary that shows the sum of all rows, which is supported out-of-the-box by the igGrid (if Summaries have been enabled) and could be setup by setting the column settings and the summary operand type to “sum” in the “Summary” options.

Providing me with those details would allow me to give you a more precise answer.

    <style>
    tfoot[role='rowgroup'] tr:not([id$='_sum']) {
        display: none
    }
    </style>

igGridSummary.zip

If you want to show a “sum” summary for specific columns only, try getting the columns of the grid after it has been initialized, by using something like this:

$("#grid").igGrid("option", "columns")

This would allow you to set the column settings for the Summary feature even after it has been initialized. Only the getter for the Summary columnSettings is shown in the documentation, but it would work as a setter as well. Please note this was not intended for public use, but it would work for you. In case you have a column with the key of “UnitPrice” and you want to disable its summary after the grid has been initialized, the code would look like this:

$("#grid").igGridSummaries("option", "columnSettings", [{ columnKey: "UnitPrice", allowSummaries: false  },]);

I still think transforming the API data before databinding the igGrid so that the dates are being displayed vertically on different rows, instead of visualizing then as columns, would be a better idea – this would allow you to use the Summaries more easily and sum the number of days a student has been absent.

Please let me know if I have misunderstood your requirements and the above suggestions do not work for your scenario.