Unplanned
Last Updated: 29 Jan 2021 16:29 by ADMIN
Fredrik
Created on: 29 Jan 2021 16:27
Category: ListView
Type: Feature Request
4
Add State feature for the ListView

Add State feature so it will be possible to programmatically save, load and change current state of the ListView.

For example, programmatically open/close item in Edit mode.

 

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ADMIN EDIT

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A workaround can be achieved using JSInterop 

function TriggerClose() {

    var btn = document.querySelector(".close-edit");
    if (btn && btn.click) {
        btn.click();
    }
}
@inject IJSRuntime JSInterop

<TelerikButton OnClick="@CloseEdit">Close Edit</TelerikButton>

<TelerikListView Data="@ListViewData" Pageable="true"
                 OnCreate="@CreateHandler" OnDelete="@DeleteHandler" OnUpdate="@UpdateHandler"
                 OnEdit="@EditHandler" OnCancel="@CancelHandler">    
    <EditTemplate>        
        <div class="edit-template" style="border: 1px solid green; margin: 10px; padding: 10px; display: inline-block;">
            <TelerikTextBox @bind-Value="@context.Name" Label="Name" /><br />
            <TelerikDropDownList Data="@Teams" @bind-Value="@context.Team" />
            <ListViewCommandButton Command="Save" Icon="save">Save</ListViewCommandButton>
            <ListViewCommandButton Class="close-edit" Command="Cancel" Icon="cancel">Cancel</ListViewCommandButton>
        </div>
    </EditTemplate>
    <Template>
        <div style="border: 1px solid black; margin: 10px; padding: 10px; display: inline-block;">
            Employee: @context.Id <br />
            Name: @context.Name in team: @context.Team
            <ListViewCommandButton Command="Edit" Icon="edit">Edit</ListViewCommandButton>
            <ListViewCommandButton Command="Delete" Icon="delete">Delete</ListViewCommandButton>
        </div>
    </Template>
    <HeaderTemplate>
        <ListViewCommandButton Command="Add" Icon="plus">Add Employee</ListViewCommandButton>
        <p>In this sample, the first item will not open for editing because of the code in the OnEdit handler</p>
    </HeaderTemplate>
</TelerikListView>

@code{
    List<Employee> ListViewData { get; set; }
    List<string> Teams { get; set; }

    async Task CloseEdit()
    {
        await JSInterop.InvokeVoidAsync("TriggerClose");
    }

    async Task UpdateHandler(ListViewCommandEventArgs args)
    {
        Employee item = (Employee)args.Item;

        // perform actual data source operation here through your service
        await MyService.Update(item);

        // update the local view-model data with the service data
        await GetListViewData();
    }

    async Task DeleteHandler(ListViewCommandEventArgs args)
    {
        Employee item = (Employee)args.Item;

        // perform actual data source operation here through your service
        await MyService.Delete(item);

        // update the local view-model data with the service data
        await GetListViewData();
    }

    async Task CreateHandler(ListViewCommandEventArgs args)
    {
        Employee item = (Employee)args.Item;

        // perform actual data source operation here through your service
        await MyService.Create(item);

        // update the local view-model data with the service data
        await GetListViewData();
    }

    async Task EditHandler(ListViewCommandEventArgs e)
    {
        Employee currItem = e.Item as Employee;

        // prevent opening an item for editing on condition
        if (currItem.Id < 2)
        {
            e.IsCancelled = true;
        }
    }

    async Task CancelHandler(ListViewCommandEventArgs e)
    {
        Employee changedItem = e.Item as Employee;
        // this is the item as the user edited it, but chose to cancel editing/inserting
        Console.WriteLine($"user changed item {changedItem.Id} to have Name: {changedItem.Name} and Team: {changedItem.Team}");
    }

    // data and models follow

    async Task GetListViewData()
    {
        ListViewData = await MyService.Read();
        Teams = await MyService.GetTeams();
    }

    protected override async Task OnInitializedAsync()
    {
        await GetListViewData();
    }

    public class Employee
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public string Team { get; set; }
    }

    // the following static class mimics an actual data service that handles the actual data source
    // replace it with your actual service through the DI, this only mimics how the API can look like and works for this standalone page
    public static class MyService
    {
        private static List<Employee> _data { get; set; } = new List<Employee>();
        private static List<string> _teams = new List<string> { "Sales", "Dev", "Support" };

        public static async Task Create(Employee itemToInsert)
        {
            itemToInsert.Id = _data.Count + 1;
            _data.Insert(0, itemToInsert);
        }

        public static async Task<List<Employee>> Read()
        {
            if (_data.Count < 1)
            {
                for (int i = 1; i < 50; i++)
                {
                    _data.Add(new Employee()
                    {
                        Id = i,
                        Name = $"Name {i}",
                        Team = _teams[i % _teams.Count]
                    });
                }
            }

            return await Task.FromResult(_data);
        }

        public static async Task<List<string>> GetTeams()
        {
            return await Task.FromResult(_teams);
        }

        public static async Task Update(Employee itemToUpdate)
        {
            var index = _data.FindIndex(i => i.Id == itemToUpdate.Id);
            if (index != -1)
            {
                _data[index] = itemToUpdate;
            }
        }

        public static async Task Delete(Employee itemToDelete)
        {
            _data.Remove(itemToDelete);
        }
    }
}


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