Pass form’s hidden input value in query string with ASP.NET Core MVC view

<form asp-controller="Search" asp-action="Index" asp-route-searchCriteria="@Model.SearchCriteria">
    <input type="hidden" asp-for="SearchCriteria" />
    <button type="submit">Search</button>
</form>

In this example, we’re using the `asp-route` attribute to pass the `SearchCriteria` model property as a route value. When the form is submitted, the `SearchCriteria` value will be appended to the query string as `searchCriteria={value}`.

Using JavaScript to append hidden input value to the query string

Sometimes, we might need to append the hidden input value to the query string dynamically using JavaScript. Here’s an example:

<form id="searchForm" asp-controller="Search" asp-action="Index">
    <input type="hidden" id="searchCriteria" asp-for="SearchCriteria" />
    <button type="submit">Search</button>
</form>

<script>
    $(document).ready(function () {
        $('#searchForm').submit(function (e) {
            var formData = $(this).serialize();
            var searchCriteria = $('#searchCriteria').val();
            var url = $(this).attr('action') + '?searchCriteria=' + encodeURIComponent(searchCriteria);
            $(this).attr('action', url);
        });
    });
</script>

In this example, we’re using jQuery to serialize the form data and append the hidden input value to the query string when the form is submitted.

Using the `IFormCollection` to access hidden input values in the controller action

Once we’ve passed the hidden input value in the query string, we need to access it in the controller action. One way to do this is by using the `IFormCollection` interface.

[HttpGet]
public IActionResult Index(IFormCollection collection)
{
    var searchCriteria = collection["searchCriteria"];
    // Perform search operation using the searchCriteria value
    return View();
}

In this example, we’re injecting the `IFormCollection` interface into the controller action and accessing the `searchCriteria` value using the `collection[“searchCriteria”]` syntax.

Using model binding to access hidden input values in the controller action

Another way to access hidden input values in the controller action is by using model binding. Here’s an example:

public class SearchModel
{
    public string SearchCriteria { get; set; }
}

[HttpGet]
public IActionResult Index(SearchModel model)
{
    // Perform search operation using the model.SearchCriteria value
    return View();
}

In this example, we’re creating a `SearchModel` class with a `SearchCriteria` property, and then using model binding to populate the `SearchCriteria` property with the value from the query string.

Best practices for passing hidden input values in query strings

Here are some best practices to keep in mind when passing hidden input values in query strings:

• Use the `asp-route` attribute to pass hidden input values as route values.
• Use JavaScript to append hidden input values to the query string dynamically.
• Use the `IFormCollection` interface or model binding to access hidden input values in the controller action.
• Avoid passing sensitive data in the query string, as it can be tampered with or accessed by unauthorized users.
• Use HTTPS to encrypt the query string and protect sensitive data.
• Validate and sanitize user input data to prevent security vulnerabilities.

Conclusion

In this article, we’ve explored the different ways to pass form’s hidden input value in a query string with ASP.NET Core MVC view. We’ve also discussed the best practices for passing hidden input values in query strings and how to access them in the controller action using `IFormCollection` or model binding. By following these guidelines, you can ensure that your web application is secure and efficient.

Remember, passing hidden input values in query strings can be a powerful tool for building dynamic and interactive web applications. With ASP.NET Core MVC, you have the flexibility to choose the approach that best fits your needs.

By mastering these techniques, you’ll be able to build robust and scalable web applications that meet the demands of your users.

1. Passing hidden input values in query strings
2. Using `asp-route` attribute
3. Using JavaScript
4. Using `IFormCollection` interface
5. Using model binding
6. Best practices for passing hidden input values in query strings

We hope this article has provided you with a comprehensive guide to passing form’s hidden input value in a query string with ASP.NET Core MVC view. Happy coding!

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