CheckBox

in namespace DotVVM.BusinessPack.Controls

Renders a CheckBox control similar to HTML checkbox.

Usage & Scenarios

Inherits the built-in CheckBox control with a DotVVM Business Pack visual style.

Sample 1: Basic CheckBox

The CheckBox control has the Checked property of boolean which indicates whether the control is checked or not.

Optionally, you can use the Text property to specify the label for the checkbox. Or you can put the label contents inside the bp:CheckBox element.

page.dothtml
ViewModel.cs

<bp:CheckBox Text="CheckBox"
             Checked="{value: IsChecked}" />

using DotVVM.Framework.ViewModel;

namespace DotvvmWeb.Views.Docs.Controls.businesspack.CheckBox.sample1
{
    public class ViewModel : DotvvmViewModelBase
    {
        public bool IsChecked { get; set; }
    }
}

Sample 2: Multiple CheckBoxes

The CheckBox has also a property CheckedItems which can bind to any collection. This is an alternative to the Checked property - these properties cannot be combined. The collection will always contain values of the checkboxes which are checked. The value of the checkbox which should be inserted in the collection, is defined in the CheckedValue property.

You can also modify the collection contents in the viewmodel code which will update the checkbox check states appropriately.

page.dothtml
ViewModel.cs

<h3>Select extra ingredients for your pizza:</h3>

<bp:CheckBox Text="Corn (0.5$)" CheckedValue="{value: 0.5}" CheckedItems="{value: Extras}" Changed="{command: UpdatePrice()}" />
<bp:CheckBox Text="Jalapeño (0.75$)" CheckedValue="{value: 0.75}" CheckedItems="{value: Extras}" Changed="{command: UpdatePrice()}" />
<bp:CheckBox Text="Bacon (1$)" CheckedValue="{value: 1}" CheckedItems="{value: Extras}" Changed="{command: UpdatePrice()}" />

<br />

<p>Total Price: {{value: Price}}$</p>

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

namespace DotvvmWeb.Views.Docs.Controls.businesspack.CheckBox.sample2
{
    public class ViewModel : DotvvmViewModelBase
    {
        public List<double> Extras { get; set; } = new List<double>();

        public double Price { get; set; }

        public void UpdatePrice()
        {
            Price = Extras.DefaultIfEmpty(0).Sum();
        }
    }
}

Sample 3: CheckBox's Changed Event

The CheckBox has the Changed event which is fired whenever the checkbox is checked or unchecked by the user.

page.dothtml
ViewModel.cs

<bp:CheckBox Checked="{value: Value}" Changed="{command: OnChanged()}" />

<p>{{value: NumberOfChanges}}</p>

using DotVVM.Framework.ViewModel;

namespace DotvvmWeb.Views.Docs.Controls.businesspack.CheckBox.sample3
{
    public class ViewModel : DotvvmViewModelBase
    {
        public bool Value { get; set; }

        public int NumberOfChanges { get; set; } = 0;

        public void OnChanged()
        {
            NumberOfChanges++;
        }
    }
}

Real World Sample

The total price is calculated by summing of all CheckedValues and is updated after any change by Changed event.

Because the collection holds floats instead of strings, we have to use the {value: 0.5} binding instead of just "0.5" so the value is treated as a number and not as a string.

page.dothtml
ViewModel.cs

<h3>Additional ingredients for your pizza!</h3>
<p>
    <bp:CheckBox CheckedItems="{value: Extra}" 
                  Changed="{command: UpdatePrice()}" 
                  CheckedValue="{value: 0.5}" Text="Jalapeño (0.5$)" />
    <br />

    <bp:CheckBox CheckedItems="{value: Extra}" 
                  Changed="{command: UpdatePrice()}" 
                  CheckedValue="{value: 0.45}" Text="Egg (0.45$)" />
    <br />

    <bp:CheckBox CheckedItems="{value: Extra}" 
                  Changed="{command: UpdatePrice()}" 
                  CheckedValue="{value: 0.75}" Text="Tuna (0.75$)" />
    <br />

    <bp:CheckBox CheckedItems="{value: Extra}" 
                  Changed="{command: UpdatePrice()}" 
                  CheckedValue="{value: 0.2}" Text="Garlic (0.2$)" />
    <br />

    <bp:CheckBox CheckedItems="{value: Extra}" 
                  Changed="{command: UpdatePrice()}" 
                  CheckedValue="{value: 0.8}" Text="Magic Mushrooms (0.8$)" />
</p>

<p>Total price: ${{value: Price}}</p>

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

namespace DotvvmWeb.Views.Docs.Controls.businesspack.CheckBox.sample4
{
    public class ViewModel : DotvvmViewModelBase
    {
        public List<float> Extra { get; set; } = new List<float>();

        public float Price { get; set; } = 4;

        public void UpdatePrice()
        {
            Price = 4 + Extra.DefaultIfEmpty(0).Sum();
        }

    }
}

Show all inherited properties

Properties

Name	Type	Description	Notes	Default Value
AutoFocus	Boolean	Gets or sets whether the control should have focus when page loads or when a dialog is opened. The default value is false.	attribute inner element static value bindable default	False
Checked	Boolean?	Gets or sets whether the control is checked.	attribute inner element static value bindable default	False
CheckedIcon	IconBase	Gets or sets the icon displayed when the control is checked.	attribute inner element static value bindable default	null
CheckedItems	IEnumerable	Gets or sets a collection of all checked values. Use this property in combination with the CheckedValue property.	attribute inner element static value bindable default	null
CheckedValue	Object	Gets or sets the value that will be used as a result when the control is checked.	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
ContentTemplate	ITemplate	Gets or sets a template rendering contents of the control.	attribute inner element static value bindable default	null
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. The DataContext is null in client-side templates.	attribute inner element static value bindable default	null
Enabled	Boolean	Gets or sets whether the control is enabled and can be clicked on.	attribute inner element static value bindable default	True
ID	String	Gets or sets the control client ID within its naming container.	attribute inner element static value bindable default	null
IncludeInPage	Boolean	Gets or sets whether the control is included in the DOM of the page.	attribute inner element static value bindable default	True
TabIndex	Int32	Gets or sets the order in which the control is reachable in sequential keyboard navigation. The default value is 0 which means the document order.	attribute inner element static value bindable default	0
Text	String	Gets or sets the text displayed inside the control.	attribute inner element static value bindable default	null
Visible	Boolean		attribute inner element static value bindable default	True

Events

	Name	Type	Description
	Changed	Command	Gets or sets the command triggered when the check state is changed.

HTML produced by the control

With no Text or an inner content specified, the control renders just the checkbox.

<input type="checkbox" data-bind="..." />

If there is a Text or an inner content, the label is rendered around the checkbox.

<label>
  <input type="checkbox" data-bind="..." />
  Text or inner content
</label>

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