How to make asp.net mvc client side validation working?

How to make asp.net mvc client side validation working?

To make ASP.NET MVC client-side validation work, you need to include the necessary JavaScript files and enable client-side validation in your application.

Here are the steps you can follow to enable client-side validation in your ASP.NET MVC application:

  • Include the necessary JavaScript files: ASP.NET MVC uses jQuery validation plugin to perform client-side validation. Therefore, you need to include jQuery and jQuery validation plugin files in your HTML layout page. You can use the following code to include these files:
<!-- jQuery library --> <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script> <!-- jQuery validation plugin --> <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.19.3/jquery.validate.min.js"></script>
  • Enable client-side validation in your application: To enable client-side validation, you need to add the following code to your Web.config file:
<appSettings> <add key="ClientValidationEnabled" value="true"/> <add key="UnobtrusiveJavaScriptEnabled" value="true"/> </appSettings>
  • Add validation attributes to your model properties: To enable client-side validation for your model properties, you need to add validation attributes such as [Required], [StringLength], and [RegularExpression] to your model properties. Here's an example:
public class Person { [Required] public string FirstName { get; set; } [Required] public string LastName { get; set; } [EmailAddress] public string Email { get; set; } [Phone] public string Phone { get; set; } }
  • Add validation controls to your views: To display validation messages for your model properties, you need to add validation controls such as @Html.ValidationMessageFor and @Html.ValidationSummary to your views. Here's an example:
@model Person @using (Html.BeginForm()) { <div> @Html.LabelFor(m => m.FirstName) @Html.TextBoxFor(m => m.FirstName) @Html.ValidationMessageFor(m => m.FirstName) </div> <div> @Html.LabelFor(m => m.LastName) @Html.TextBoxFor(m => m.LastName) @Html.ValidationMessageFor(m => m.LastName) </div> <div> @Html.LabelFor(m => m.Email) @Html.TextBoxFor(m => m.Email) @Html.ValidationMessageFor(m => m.Email) </div> <div> @Html.LabelFor(m => m.Phone) @Html.TextBoxFor(m => m.Phone) @Html.ValidationMessageFor(m => m.Phone) </div> <input type="submit" value="Save" /> } @Html.ValidationSummary(true, "", new { @class = "text-danger" })

In this example, we use @Html.ValidationMessageFor to display validation messages for each model property, and @Html.ValidationSummary to display a summary of all validation errors. The true parameter in @Html.ValidationSummary indicates that only model-level errors should be displayed.

By following these steps, you should be able to enable client-side validation in your ASP.NET MVC application.

Examples

  1. "ASP.NET MVC enable client-side validation"

    Code:

    @section Scripts { @Scripts.Render("~/bundles/jqueryval") }

    Description: Ensures that the jQuery Validation library is included in the view, enabling client-side validation.

  2. "ASP.NET MVC client-side validation not working"

    Code:

    @Html.ValidationSummary(true) @Html.ValidationMessageFor(model => model.PropertyName)

    Description: Renders the validation summary and messages for specific properties to display client-side validation errors.

  3. "ASP.NET MVC unobtrusive client-side validation"

    Code:

    <appSettings> <add key="ClientValidationEnabled" value="true" /> <add key="UnobtrusiveJavaScriptEnabled" value="true" /> </appSettings>

    Description: Ensures that client validation and unobtrusive JavaScript are enabled in the web.config file.

  4. "ASP.NET MVC enable client-side validation in partial view"

    Code:

    @section Scripts { @Scripts.Render("~/bundles/jqueryval") }

    Description: Includes the jQuery Validation library in the partial view to enable client-side validation for the partial view.

  5. "ASP.NET MVC client-side validation not firing"

    Code:

    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script> <script src="https://cdn.jsdelivr.net/jquery.validation/1.19.2/jquery.validate.min.js"></script> <script src="https://cdn.jsdelivr.net/jquery.validation/1.19.2/additional-methods.min.js"></script>

    Description: Ensures that the required jQuery and jQuery Validation scripts are included in the layout or view.

  6. "ASP.NET MVC client-side validation for custom validation attribute"

    Code:

    [AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = true)] public class CustomValidationAttribute : ValidationAttribute, IClientValidatable { // Implementation of server-side validation logic public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context) { // Implementation of client-side validation logic yield return new ModelClientValidationRule { ErrorMessage = ErrorMessage, ValidationType = "customvalidation" }; } }

    Description: Implements a custom validation attribute that works both on the server and client side.

  7. "ASP.NET MVC client-side validation for remote validation"

    Code:

    [Remote("IsUsernameAvailable", "Account", ErrorMessage = "Username is not available.")] public string Username { get; set; }

    Description: Uses the [Remote] attribute to enable client-side validation for remote validation scenarios.

  8. "ASP.NET MVC client-side validation for datepicker"

    Code:

    @Html.EditorFor(model => model.DateOfBirth, new { htmlAttributes = new { @class = "datepicker" } })

    Description: Includes a datepicker library and assigns the "datepicker" class to the date input field for client-side validation.

  9. "ASP.NET MVC client-side validation for dropdownlist"

    Code:

    @Html.DropDownListFor(model => model.CategoryId, ViewBag.Categories as SelectList, "Select Category")

    Description: Renders a dropdown list with categories and ensures client-side validation works for the dropdown list.

  10. "ASP.NET MVC client-side validation for custom validation script"

    Code:

    <script> $.validator.addMethod("customValidation", function (value, element, params) { // Custom client-side validation logic return true; // or false based on validation }, "Custom validation error message."); $.validator.unobtrusive.adapters.add("customvalidation", {}, function (options) { options.rules["customValidation"] = true; options.messages["customValidation"] = options.message; }); </script>

    Description: Defines a custom client-side validation method and adapter for integration with unobtrusive validation.

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