I have a string field in my modal class where users will have to enter numbers between 1-8 only. Modal class attribute:

[MaxLength(1)]
[MinLength(1)]
[Required(ErrorMessage = "Please enter correct value")]
public string RoomNumber { get; set; }

This input is asked in view page as::

<div class="form-group">
@Html.LabelFor(model => model.RoomNumber, htmlAttributes: new { @class = "col-md-12" })
<div class="col-md-12">
    @Html.EditorFor(model => model.RoomNumber, new { htmlAttributes = new { @class = "form-control input-digit", @type = "number", @min = "1", @max = "8" } })
    @Html.ValidationMessageFor(model => model.RoomNumber, "", new { @class = "text-danger" })
</div>
</div>

1. I want to print validation message for the user if they enter incorrect value, I mean to show error message if they enter value greater than 8.

2. Also can I restrict user input between 1 - 8 digit number only? Is it possible?

I can not change the data type of RoomNumber attribute due to project restrictions.

Thank You.

CodePudding user response：

In the example below the RegularExpression attribute is used to validate the RoomNumber property:

public class RoomInfo
{
    [RegularExpression(@"^[1-8]{1}$", ErrorMessage = "Enter valid number from 1 to 8"), Required]        
    public string RoomNumber { get; set; }
}

The view:

@model RoomInfo

@using (Html.BeginForm("Save", "Home"))
{
    @Html.ValidationSummary();

    <div class="form-group">
            @Html.LabelFor(m => m.RoomNumber)
            <p>@Html.TextBoxFor(m => m.RoomNumber, htmlAttributes: new { type="number", placeholder = "Room number" })</p>
            @Html.ValidationMessageFor(m => m.RoomNumber)
     </div>
    <button type="submit" class="btn btn-primary">Save</button>
}