Hello Bui Hien,

I'm afraid igGridSummaries doesn't have tooltip functionality.
But, if you want to show tooltip for summary cells, you can customize with jQuery UI tooltip.

Here is a sample code.

``` JavaScript
$("#grid").igGrid({
width: "100%",
height: "600px",

// any other configurations

// initialize jQuery UI tooltip When footerRendered event fires.
// http://www.igniteui.com/help/api/2016.2/ui.iggrid#events:footerRendered
footerRendered: function (evt, ui) {
ui.table.tooltip({
tooltipClass: 'foo',
// http://www.igniteui.com/help/api/2016.2/ui.iggridsummaries#theming:ui-iggrid-summaries-footer-text-container
items: '.ui-iggrid-summaries-footer-text-container',
content: function () {
return this.textContent;
}
});
},

// any other configurations
});
```

``` CSS
.foo {
opacity: 1;
}
```

I hope this will help.

Best regards,
Tatsushi Kiryu
Developer support Engineer
Infragistics

Hi Tatsushi Kiryu

After i apply CSS following guide, problem is resolved. http://jsfiddle.net/dbL9rhcu/3/

But when i use summaries features of grid, content of cell summaries too long and it don't display full content. How i can show tooltip like cell of grid?

Hello Bui Hien,

Thank you for sending me a reproducible sample.

There is no error in your sample, but it seems that some rows have too much height due to their cell values.

So I suggest to apply CSS as follow.

```
tbody td {
white-space: nowrap; /* or 'pre' */
}
```

I hope you try it.

Best regards,
Tatsushi Kiryu
Developer support Engineer
Infragistics

Hi Tatsushi Kiryu

I using Chrome Version 58.0.3029.110 (64-bit) on OS Linux mint 18 mate 

I uploaded code to jsfiddle: http://jsfiddle.net/dbL9rhcu/2/

My data contain \n (newline), so I think errors happen. Can you review it?