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CheckBox

in namespace DotVVM.BusinessPack.Controls

Renders the HTML checkbox control.

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.

<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.

<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.

<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.

<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();
        }

    }
}

Properties

Name Type Description Notes Default Value
property icon Attributes Dictionary<String,Object>
attribute
inner element
static value
bindable
default
 null
property icon AutoFocus Boolean
attribute
inner element
static value
bindable
default
 False
property icon Checked Boolean?
attribute
inner element
static value
bindable
default
 False
property icon CheckedIcon IconBase
attribute
inner element
static value
bindable
default
 null
property icon CheckedItems IEnumerable
attribute
inner element
static value
bindable
default
 null
property icon CheckedValue Object
attribute
inner element
static value
bindable
default
 null
property icon ContentTemplate ITemplate
attribute
inner element
static value
bindable
default
 null
property icon Enabled Boolean
attribute
inner element
static value
bindable
default
 False
property icon TabIndex Int32
attribute
inner element
static value
bindable
default
 0
property icon Text String
attribute
inner element
static value
bindable
default
 null
property icon Visible Boolean
attribute
inner element
static value
bindable
default
 null

Events

Name Type Description
event icon Changed Command

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>