Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
574 views
in Technique[技术] by (71.8m points)

c# - validate age according to date of birth using model in mvc 4

I have registration form and its contain date of birth field.

Using calender date picker its input the value to this field.

these are the steps to insert value for this field

step 1

enter image description here

step 2

enter image description here

step 3

enter image description here

so its taking values in dd/MM/yyyy format

This is appearance of date of birth field in my model class

[DisplayName("Date of Birth")]
[DataType(DataType.Date), DisplayFormat(DataFormatString = "{0:dd/MM/yyyy}", ApplyFormatInEditMode = true)]
public Nullable<System.DateTime> Date_of_Birth { get; set; }

This is appearance of date of birth field in my view file

   <div class="form-group"> 
   <div class="editor-label">
        @Html.LabelFor(model => model.Date_of_Birth)
        @Html.Label("*", new { id="star" , @class = "requiredFiledCol" })
   </div>
   <div class="editor-field">
        @Html.TextBoxFor(model => model.Date_of_Birth, "{0:dd/MM/yyyy}", new { @class = "form-control datepicker", placeholder = "DD/MM/YYYY" , maxlength="100" })
        @Html.ValidationMessageFor(model => model.Date_of_Birth)
    </div>
    </div>

I want to do client side validation for data of birth field . show error message when input filed is not in this range 100>Age>18

whats the approach I should take ?

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

Well since you are already using data annotations why not make your own. do this:

create a class in an dll that you use or make a new one and at a minimum add the following code to it

public class MinimumAgeAttribute: ValidationAttribute
{
    int _minimumAge;

    public MinimumAgeAttribute(int minimumAge)
    {
      _minimumAge = minimumAge;
    }

    public override bool IsValid(object value)
    {
        DateTime date;
        if (DateTime.TryParse(value.ToString(),out date))
        {
            return date.AddYears(_minimumAge) < DateTime.Now;
        }

        return false;
    }
}

then in your view model do this:

[MinimumAge(18)]
[DisplayName("Date of Birth")]
[DataType(DataType.Date), DisplayFormat(DataFormatString = "{0:dd/MM/yyyy}", ApplyFormatInEditMode = true)]
public Nullable<System.DateTime> Date_of_Birth { get; set; }

or your web page you will have no issues as the framework(s) you use will pick it up. Without changing the ErrorMessage property in your class you will get something like

The field "{0}" is not valid.

The {0} is replaced by the property name or display name attribute that you gave the property in your model.

Hope it works for you.

Walter ps: make sure in the controller you do

if (ModelState.IsValid)
{
 ....
}

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...