Repeater

in namespace DotVVM.Framework.Controls

Repeats a template for each item in the DataSource collection.

Usage & Scenarios

Repeats a template for each item in the DataSource collection.

Sample 1: Basic Repeater

The DataSource points to an IEnumerable or a GridViewDataSet object.

Inside the ItemTemplate, you can use _this to access the current data item.

page.dothtml
ViewModel.cs

<dot:Repeater DataSource="{value: Items}">
  <ItemTemplate>
    {{value: _this}}<br />
  </ItemTemplate>
</dot:Repeater>

using DotVVM.Framework.ViewModel;

namespace DotvvmWeb.Views.Docs.Controls.builtin.Repeater.sample1
{
    public class ViewModel : DotvvmViewModelBase
    {
        public string[] Items { get; set; } = { "First", "Second", "Third" };

    }
}

Sample 2: Wrapper Tag Customization

If you don't want to render <div>, just change the WrapperTagName property to something else. Or, set the RenderWrapperTag property to false if you don't want to render any wrapper tag.

page.dothtml
ViewModel.cs

<dot:Repeater DataSource="{value: Items}" WrapperTagName="ul">
    <ItemTemplate>
        <li>{{value: _this}}</li>
    </ItemTemplate>
</dot:Repeater>

using DotVVM.Framework.ViewModel;

namespace DotvvmWeb.Views.Docs.Controls.builtin.Repeater.sample2
{
    public class ViewModel : DotvvmViewModelBase
    {
        public string[] Items { get; set; } = { "First", "Second", "Third" };

    }
}

Sample 3: Real World Sample

A simple task list.

page.dothtml
ViewModel.cs

@viewModel DotvvmWeb.Views.Docs.Controls.builtin.Repeater.sample3.ViewModel, DotvvmWeb

<p>
    Create a new task: 
    <dot:TextBox Text="{value: NewTaskTitle}" /> 
    <dot:Button Text="Add" Click="{command: AddTask()}" />
</p>

<dot:Repeater DataSource="{value: Tasks}" WrapperTagName="table">
    <ItemTemplate>
        <tr>
            <td>{{value: Title}}</td>
            <td>{{value: Completed ? ("Finished: " + CompletionDate) : "Not yet"}}</td>
            <td>
                <dot:LinkButton Text="Done" 
                                Click="{command: CompleteTask()}" 
                                Visible="{value: !Completed}" />
            </td>
        </tr>
    </ItemTemplate>
</dot:Repeater>

using System;
using System.Collections.Generic;
using DotVVM.Framework.ViewModel;

namespace DotvvmWeb.Views.Docs.Controls.builtin.Repeater.sample3
{
    public class ViewModel : DotvvmViewModelBase
    {
        public List<MyTask> Tasks { get; set; } = new List<MyTask>();

        public string NewTaskTitle { get; set; }

        public ViewModel()
        {
            Tasks.Add(new MyTask("Install the DotVVM VS Extension"));
            Tasks.Add(new MyTask("Create the first project"));
            Tasks.Add(new MyTask("Build your first app"));
            Tasks.Add(new MyTask("Buy Professional Edition of DotVVM VS Extension"));
        }

        public void AddTask()
        {
            Tasks.Add(new MyTask(NewTaskTitle));
            NewTaskTitle = null;
        }

    }

    public class MyTask
    {
        public string Title { get; set; }

        public bool Completed { get; set; } = false;

        public string CompletionDate { get; set; }

        public MyTask(string title)
        {
            Title = title;
        }

        public MyTask()
        {

        }

        public void CompleteTask()
        {
            Completed = true;
            CompletionDate = DateTime.Now.ToString();
        }
    }
}

Properties

Name	Type	Description	Notes	Default Value
Attributes	Dictionary<String,Object>		attribute inner element static value bindable default	null
ClientIDMode	ClientIDMode	Gets or sets the client ID generation algorithm.	attribute inner element static value bindable default	Static
DataContext	Object	Gets or sets a data context for the control and its children. All value and command bindings are evaluated in context of this value.	attribute inner element static value bindable default	null
DataSource	Object	Gets or sets the source collection or a GridViewDataSet that contains data in the control.	attribute inner element static value bindable default	null
EmptyDataTemplate	ITemplate	Gets or sets the template which will be displayed when the DataSource is empty.	attribute inner element static value bindable default	null
ID	String	Gets or sets the unique control ID.	attribute inner element static value bindable default	null
InnerText	String	Gets or sets the inner text of the HTML element.	attribute inner element static value bindable default	null
ItemTemplate	ITemplate	Gets or sets the template for each Repeater item.	attribute inner element static value bindable default	null
RenderWrapperTag	Boolean	Gets or sets whether the control should render a wrapper element.	attribute inner element static value bindable default	True
Visible	Boolean	Gets or sets whether the control is visible.	attribute inner element static value bindable default	True
WrapperTagName	String	Gets or sets the name of the tag that wraps the Repeater.	attribute inner element static value bindable default	div

HTML produced by the control

You can define, what tag the Repeater renders, using the WrapperTagName. The default is div:

<dot:Repeater DataSource="{value: Items}">
    <ItemTemplate>
        <p>{{value: Name}}</p>
    </ItemTemplate>
</dot:Repeater>

<!-- Client rendering mode -->
<div data-bind="foreach: ...">
    <p><span data-bind="..."></span></p>
</div>

<!-- Server rendering mode -->
<div>
    <p>Jim Hacker</p>
    <p>Humphrey Appleby</p>
    <p>Bernard Woolley</p>
</div>

The ItemTemplate is default element property and so the <ItemTemplate> element can be omitted if it's the only one inside the Repeater control.

Using the RenderWrapperTag you can turn off the wrapper tag. The Knockout comments will then be used in the client rendering mode:

<!-- ko foreach: ... -->
<p><span data-bind="..."></span></p>
<!-- /ko -->

Be careful. Knockout comment bindings don't work well if they are directly in the <table> element. Put the Repeater inside the <tbody> element and it will work.