Kendo Grid kendo-grid-string-filter-cell not allowing negative zeroes

[Jason]

Whenever i tried to key in a negative sign "-", followed by a zero. the grid filter will automatically change it to zero.

how can i prevent it from automatically changing?

need to maintain a numeric filter, (no letters allowed)

 

Code:

<kendo-grid-column field="xx" title="xx">
<ng-template kendoGridFilterCellTemplate let-filter let-column="column">
<kendo-grid-numeric-filter-cell
[showOperators]=false
[column]="column">
</kendo-grid-numeric-filter-cell>
....
<kendo-grid-column>

[Veselin]

Hi Jason,

The behavior you are describing seems strange as the "-" sign is supported in the Kendo UI for Angular Grid filter.

I tried to reproduce this scenario but I could not get the same behavior by using the FilterCellTemplateDirective or via the regular Kendo UI for Angular Grid filtering method: 

https://stackblitz.com/edit/angular-6fbe1z-eqze7p 

My suspicion is that you could be using an outdated version of the Grid component in which this behavior has not been fixed.

Could you please share the current Angular and Grid versions you are using so I can investigate this further? 

Thank you.

Regards,
Veselin
Progress Telerik