Grid Filter events? Trap and adjust user input (Trim) on filter values (without OnRead).

[Rob]

I have no problem with adjusting filter values (trim white space) when the Grid uses OnRead event:

    private async Task OnBookingGridRead(GridReadEventArgs args)
    {
            // Are any filters selected, if so we need to work from the filtered List
            if (args.Request.Filters.Count > 0)
            {

                await TrimFilters(args.Request.Filters);

and the cycle thru filter values and trim them:

    // Removes white space (aka Trim) on any filter input 
    private Task TrimFilters(IList<IFilterDescriptor> filters)
    {
        // Cycle the filters and trim Values
        foreach (var filterDescriptor in filters)
        {
            switch (filterDescriptor)
            {
                case FilterDescriptor singleFilterDescriptor:
                    // Only one filter
                    singleFilterDescriptor.Value = singleFilterDescriptor.Value.ToString()?.Trim();
                    break;
                case CompositeFilterDescriptor compositeFilter:
                {
                    foreach (var subFilter in compositeFilter.FilterDescriptors)
                    {
                        if (subFilter is FilterDescriptor singleSubFilter)
                        {
                            singleSubFilter.Value = singleSubFilter.Value.ToString()?.Trim();
                        }
                    }

                    break;
                }
            }
        }

        return Task.CompletedTask;
    }

All good works fine ... BUT ... if the Grid is not using OnRead (using Data=), how can I accomplish the same task of removing white space (trim) from user filter input values?

 

[Dimo]

Hi Rob,

To detect data-related user actions when not using OnRead, please use the Grid OnStateChanged event.

Also see the Override user actions example.

Regards,
Dimo
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