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Mask Configuration

The mask is a combination of standard and custom mask elements that validates the user input based on its behavior.

When the mask value is empty, the MaskedTextBox behaves as an input element with text type.

Standard mask elements

The following table shows the list of mask elements and its behavior based on MSDN standard.

The mask can be formed by combining any one or more of these mask elements.

Mask Element Description
0 Digit required. This element will accept any single digit from 0 to 9.
9 Digit or space, optional.
# Digit or space, optional, Plus(+) and minus(-) signs are allowed.
L Letter required. It will accept letters a-z and A-Z.
? Letter or space, optional.
& Requires a character.
C Character or space, optional.
A Alphanumeric (A-Za-z0-9) required.
a Alphanumeric (A-Za-z0-9) or space, optional.
< Shift down. Converts all characters to lower case.
> Shift up. Converts all characters to upper case.
| Disable a previous shift up or shift down.
\\ Escapes a mask character, turning it into a literal.
All other characters Literals. All non-mask elements (literals) will appear as themselves within MaskedTextBox.

The following example demonstrates the usage of standard mask elements.

razor
standardmasks.cs
@section ControlsSection{

@Html.EJS().MaskedTextBox("mask1").Mask("#####").Placeholder("Mask ##### (ex: 012+-)").FloatLabelType(FloatLabelType.Always).Render()
@Html.EJS().MaskedTextBox("mask2").Mask("LLLLLL").Placeholder("Mask LLLLLL (ex: Sample)").FloatLabelType(FloatLabelType.Always).Render()
@Html.EJS().MaskedTextBox("mask3").Mask("&&&&&").Placeholder("Mask &&&&& (ex: A12@#)").FloatLabelType(FloatLabelType.Always).Render()
@Html.EJS().MaskedTextBox("mask4").Mask(">LLL<LLL").Placeholder("Mask >LLL<LL (ex: SAMple)").FloatLabelType(FloatLabelType.Always).Render()
@Html.EJS().MaskedTextBox("mask5").Mask("\\A999").Placeholder("Mask \\A999 (ex: A321)").FloatLabelType(FloatLabelType.Always).Render()

}
public ActionResult standardMasks()
{
    return View();
}

Output be like the below.

MaskedTextBox Sample

Custom mask elements

Other than the above standard mask elements, the mask can be configured with the custom characters or regular expression to define a custom behavior.

Custom characters

You can define any of the non-mask element as the mask element and its behavior through the customCharacters property.

In the following example, non-mask element P accepts the values P, A, p, a, and M accepts the values M, m as mentioned in the custom characters collection.

razor
custom-mask.cs
@section ControlsSection{

@Html.EJS().MaskedTextBox("mask1").Mask("00:00 >PM").CustomCharacters(ViewBag.cusObj).Placeholder("Time (ex: 10:00 PM, 10:00 AM)").FloatLabelType(FloatLabelType.Always).Render()

}
namespace EJ2CoreSampleBrowser.Controllers.MaskedTextbox
{
    public partial class MaskedTextboxController : Controller
    {

        public IActionResult CustomMask()
        {
            CustomCharacters customObj = new CustomCharacters();
            customObj.P = "P,A,a,p";
            customObj.M = "M,m";
            ViewBag.cusObj = customObj;
            return View();
        }
      

    }
}
public class CustomCharacters
{
    public string P { get; set; }
    public string M { get; set; }
}

Output be like the below.

MaskedTextBox Sample

Regular expression

Instead of the mask element, you can define your own regular expression to validate the input of a particular input place. The regular expressions should be wrapped by the square brackets (e.g., [Regex]).

In the following example, regular expression has been set for each input places.

razor
regularExpression.cs
@section ControlsSection{
    <div class="control-section">
        <div class="control-label">IP Address (ex: 212.212.111.222)</div>
        @Html.EJS().MaskedTextBox("mask1").Mask("[0-2][0-9][0-9].[0-2][0-9][0-9].[0-2][0-9][0-9].[0-2][0-9][0-9]").Created("onCreate").Render()
    </div>
   
    <style>
        .content-wrapper {
            width: 45%;
            margin: 0 auto;
            min-width: 185px;
            max-width: 350px;
        }

        .control-label {
            padding-right: 200px;
            font-size: 12px;
        }
       
        #container {
            visibility: hidden;
        }

        #loader {
            color: #008cff;
            font-family: 'Helvetica Neue','calibiri';
            font-size: 14px;
            height: 40px;
            left: 45%;
            position: absolute;
            top: 45%;
            width: 30%;
        }

        .control-section {
            min-height: 200px;
        }

        @@media only screen and (max-width: 500px) {
            .control-section {
                min-height: 200px;
            }
        }
</style>
}
namespace EJ2CoreSampleBrowser.Controllers.MaskedTextbox
{
    public partial class MaskedTextboxController : Controller
    {

        public IActionResult RegularExpression()
        {
            return View();
        }
    }
}

Output be like the below.

MaskedTextBox Sample

Prompt character

The Prompt character is a prompting symbol in the MaskedTextBox for the mask elements. The symbol is used to show the input positions in the MaskedTextBox. You can customize the prompt character of MaskedTextBox by using the promptChar property.

The following example demonstrates the MaskedTextBox with customized prompt character as *.

razor
prompt.cs
@section ControlsSection{

@Html.EJS().MaskedTextBox("mask1").Mask("999-999-9999").PromptChar("#").Render()

}
public ActionResult prompt()
{
    return View();
}

Output be like the below.

MaskedTextBox Sample