Checkbox not working with boolean viewmodel property

Question

I am using MVC6 and have a checkbox input field in my form, but when the form is submitted the value for the checkbox always gets passed to the ViewModel as false:

Answer 1

Pinki's answer above is good if the checkbox should default to checked.

If the checkbox should default to unchecked, a little in-line javascript sets the value to true or false upon clicking:

<input name="yourPropertyName" type="checkbox" value="false" onchange="this.value=this.checked">

Answer 2

The razor view engine normally creates a checkbox and one hidden input using the same name.

You can simply use the html below to ensure you get your desired result:

<div class="form-group">
        <div class="checkbox">     
    <input type="checkbox" value="true" name="IncludeSalesTax" />Include Sales Tax
    <input type="hidden" value="false" name="IncludeSalesTax" />
        </div>
    </div> 

Answer 3

input type checkbox sends an "on" if it is set. Otherwise it is not sent. It is important, that you set the value attribute to true. In this case it sends true or nothing, which is perfect to bind to a boolean.

<input type="checkbox" name="yourPropertyName" value="true" checked />

Answer 4

After letting Visual Studio generate the form based on my ViewModel here is how it does it:

        <div class="checkbox">
            <input asp-for="isTaxable" />
            <label asp-for="isTaxable"></label>
        </div>

Additionally, I was missing the closing of my input tag. So it can also be done like this which is the bootstrap preferred way:

<label><input asp-for="isTaxable" type="checkbox" value=""/>@Html.DisplayNameFor(m => m.isTaxable)</label>