ASPxCardView.DoCardValidation() Method

Validates the card currently being edited.

Namespace: DevExpress.Web

Assembly: DevExpress.Web.v23.2.dll

NuGet Package: DevExpress.Web

Declaration

C#

public void DoCardValidation()

VB.NET

Public Sub DoCardValidation

Remarks

The DoCardValidation method raises the ASPxCardView.CardValidating event so you can manually specify whether card values are valid.

Calling the DoCardValidation method has no effect if the ASPxCardView is in browse mode. To identify whether the grid is in edit mode, use the ASPxCardView.IsEditing property.

Example

The example below validates data entered by an end user into a card. Validation is implemented within the ASPxCardView.CardValidating event handler. In this example, validation fails in the following cases:

• one or more field values are empty;
• Contact Name and/or Company Name fields are set to a single character.

The ASPxCardView.StartCardEditing event is handled to display errors (if any) within the edited card when an end user switches to edit mode.

C#

protected void ASPxCardView1_CardValidating(object sender, ASPxCardViewDataValidationEventArgs e) {
    // Checks for null values.
    foreach (CardViewColumn column in ASPxCardView1.Columns) {
        CardViewColumn dataColumn = column as CardViewColumn;
        if (dataColumn == null) continue;
        if (e.NewValues[dataColumn.FieldName] == null)
            e.Errors[dataColumn] = "Value cannot be null.";
    }
    // Displays the card error row if there is at least one error.
    if (e.Errors.Count > 0) e.CardError = "Please fill out all fields.";

    if (e.NewValues["ContactName"] != null && e.NewValues["ContactName"].ToString().Length < 2) {
            AddError(e.Errors, ASPxCardView1.Columns["ContactName"], 
            "Contact Name must be at least two characters long.");
    }
    if (e.NewValues["CompanyName"] != null && e.NewValues["CompanyName"].ToString().Length < 2) {
        AddError(e.Errors, ASPxCardView1.Columns["CompanyName"],
            "Company Name must be at least two characters long.");
    }
    if (string.IsNullOrEmpty(e.CardError) && e.Errors.Count > 0) 
        e.CardError = "Please correct all errors.";
    }

void AddError(Dictionary<CardViewColumn, string> errors, CardViewColumn column, string errorText) {
    if(errors.ContainsKey(column)) return;
    errors[column] = errorText;
}

protected void ASPxCardView1_StartCardEditing(object sender, ASPxStartCardEditingEventArgs e){
    // Validates the edited card if it isn't a new card.
    if (!ASPxCardView1.IsNewCardEditing)
        ASPxCardView1.DoCardValidation();
    }
}