for Grid [Parameter] public string ColumnClass { get; set; } // class for column element - only applicable to Grid format [Parameter] public Action OnPageChange { get; set; } // a method to be executed in the calling component when the page changes [Parameter] public string SearchProperties { get; set; } // comma delimited list of property names to include in search [Parameter] public string SearchBoxClass { get; set; } // class for Search box [Parameter] public string Parameters { get; set; } // optional - querystring parameters in the form of "id=x&name=y" used in static render mode [SupplyParameterFromForm(FormName = "PagerForm")] public string _Search { get => ""; set => _search = value; } private IEnumerable ItemList { get; set; } protected override void OnInitialized() { Localizer = LocalizerFactory.Create(GetType().FullName); } protected override void OnParametersSet() { if (string.IsNullOrEmpty(Format)) { Format = "Table"; } if (string.IsNullOrEmpty(Toolbar)) { Toolbar = "Top"; } if (string.IsNullOrEmpty(Class)) { if (Format == "Table") { Class = "table table-borderless"; } else { Class = "container-fluid"; } } if (string.IsNullOrEmpty(RowClass)) { if (Format == "Table") { RowClass = ""; } else { RowClass = "row"; } } if (string.IsNullOrEmpty(ColumnClass)) { if (Format == "Table") { ColumnClass = ""; } else { ColumnClass = "col"; } } if (PageState.QueryString.ContainsKey("search")) { _search = PageState.QueryString["search"]; } if (!string.IsNullOrEmpty(SearchProperties)) { AllItems = Items; // only used in search if (!string.IsNullOrEmpty(_search)) { Search(); } } if (!string.IsNullOrEmpty(PageSize)) { _maxItems = int.Parse(PageSize); } if (!string.IsNullOrEmpty(Columns)) { _columns = int.Parse(Columns); } if (!string.IsNullOrEmpty(DisplayPages)) { _displayPages = int.Parse(DisplayPages); } if (PageState.QueryString.ContainsKey("page") && int.TryParse(PageState.QueryString["page"], out int page)) { _page = page; } else { if (!string.IsNullOrEmpty(CurrentPage)) { _page = int.Parse(CurrentPage); } else { _page = 1; } } if (_page < 1) _page = 1; _startPage = 0; _endPage = 0; if (Items != null) { _pages = (int)Math.Ceiling(Items.Count() / (decimal)_maxItems); if (_page > _pages) { _page = _pages; } SetPagerSize(); } } public void SetPagerSize() { _startPage = ((_page - 1) / _displayPages) * _displayPages + 1; _endPage = _startPage + _displayPages - 1; if (_endPage > _pages) { _endPage = _pages; } ItemList = Items.Skip((_page - 1) * _maxItems).Take(_maxItems); StateHasChanged(); OnPageChange?.Invoke(_page); } public void UpdateList(int page) { _page = page; SetPagerSize(); } public void SkipPages(string direction) { switch (direction) { case "forward": _page = _endPage + 1; break; case "back": _page = _startPage - 1; break; } SetPagerSize(); } public void NavigateToPage(string direction) { switch (direction) { case "next": if (_page < _pages) { _page += 1; } break; case "previous": if (_page > 1) { _page -= 1; } break; } UpdateList(_page); } public void Search() { if (!string.IsNullOrEmpty(_search)) { Items = AllItems.Where(item => { var values = SearchProperties.Split(',') .Select(itemType => GetPropertyValue(item, itemType)) .Where(value => value != null) .Select(value => value.ToString().ToLower()); return values.Any(value => value.Contains(_search.ToLower())); }).ToList(); } else { Items = AllItems; } _pages = (int)Math.Ceiling(Items.Count() / (decimal)_maxItems); UpdateList(1); } private object GetPropertyValue(object obj, string propertyName) { var index = propertyName.IndexOf("."); if (index != -1) { var propertyInfo = obj.GetType().GetProperty(propertyName.Substring(0, index)); if (propertyInfo != null) { return GetPropertyValue(propertyInfo.GetValue(obj), propertyName.Substring(index + 1)); } return null; } else { var propertyInfo = obj.GetType().GetProperty(propertyName); if (propertyInfo != null) { return propertyInfo.GetValue(obj); } return null; } } public void Reset() { _search = ""; Items = AllItems; _pages = (int)Math.Ceiling(Items.Count() / (decimal)_maxItems); UpdateList(1); } private string FormatSearchProperties() { var properties = new List(); foreach (var property in SearchProperties.Split(',', StringSplitOptions.RemoveEmptyEntries)) { var index = property.LastIndexOf("."); if (index != -1) { properties.Add(property.Substring(index + 1)); } else { properties.Add(property); } } return string.Join(",", properties); } private string PageUrl(int page, string search) { var parameters = new Dictionary(PageState.QueryString); if (parameters.ContainsKey("page")) parameters.Remove("page"); parameters.Add("page", page.ToString()); if (parameters.ContainsKey("search")) parameters.Remove("search"); if (!string.IsNullOrEmpty(search)) { parameters.Add("search", search); } if (!string.IsNullOrEmpty(Parameters)) { foreach (var parameter in Utilities.ParseQueryString(Parameters)) { if (parameters.ContainsKey(parameter.Key)) parameters.Remove(parameter.Key); parameters.Add(parameter.Key, parameter.Value); } } return PageState.Route.AbsolutePath + Utilities.CreateQueryString(parameters); } }