Selecting multiple rows of multiple pages in a grid with a server-side pager system

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Kévin
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Kévin asked on 09 Mar 2022, 04:45 PM

Hello,

I am currently working on grids with a server side pager system.
https://docs.telerik.com/blazor-ui/components/grid/manual-operations

Recently I wanted to add multiple line selection but with the server side pager I can't get a correct behavior.

My SelectedItems variable which contains the list of selected items keeps the selected items despite the change of page but on the other hand when I come back to a page with selected items, the checkboxes are not checked.
In addition I can reselect them which adds them several times in my list.

Do you have an example of a server-side paging system with multiple line selection?

 

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Marin Bratanov
Telerik team
answered on 10 Mar 2022, 08:14 PM

Hello,

Make sure the Equals comparison is correct: https://docs.telerik.com/blazor-ui/components/grid/selection/overview#selecteditems-equals-comparison

 

Regards,
Marin Bratanov
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Kévin
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commented on 11 Mar 2022, 12:33 PM

Thank you for your answer, your link helped me a lot.

I had to override the "Equals" and "GetHashCode" methods of my object because the server doesn't add items in my list when changing pages but returns me a complete list so the object references are different.

My override:

        #region Override

        /* Utilisé pour la comparaison de la grid Telerik blazor */
        public override bool Equals(object obj)
        {
            if (obj is null)
            {
                return false;
            }

            if (this.GetType() != obj.GetType())
            {
                return false;
            }

            // != V_LabelRefsInfo
            if (!(obj is V_LabelRefsInfo))
            {
                return false;
            }

            return (this.LR_Id == (obj as V_LabelRefsInfo).LR_Id)
                && (this.ARLR_Id == (obj as V_LabelRefsInfo).ARLR_Id)
                && (this.AR_Id == (obj as V_LabelRefsInfo).AR_Id);
        }

        public override int GetHashCode() => (LR_Id, ARLR_Id, AR_Id).GetHashCode();

        #endregion
Thanks again,
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Grid Pager
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Kévin
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Answers by
Marin Bratanov
Telerik team
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