How to Properly Group Radio Buttons by Question in ASP.NET MVC 5?
Dec 29, 2024 am 12:25 AM
Group Radio Buttons in ASP.NET MVC 5
Issue:
When grouping radio buttons by question in an ASP.NET MVC 5 view, all radio buttons are placed in a single group, making it impossible to select answers for multiple questions independently.
Solution:
To properly group radio buttons, you need to ensure that each question has a unique name attribute. This can be achieved by using loop indices and view models to bind the radio buttons to a typed model.
View Model:
First, create view models that will be used to represent the data and generate the form.
public class QuestionVM
{
public int ID { get; set; }
public string Text { get; set; }
public int? SelectedAnswer { get; set; }
}
public class SubjectVM
{
public int? ID { get; set; }
public string Name { get; set; }
public List<QuestionVM> Questions { get; set; }
}
public class StudentVM
{
public int ID { get; set; }
public string Name { get; set; }
public List<SubjectVM> Subjects { get; set; }
}
View:
In the view, use the @Html.BeginForm method to create a form element and then generate the radio buttons using the @Html.RadioButtonFor method.
@model YourAssembly.StudentVM
@using(Html.BeginForm())
{
// Hidden field for unique student identifier
@Html.HiddenFor(m => m.ID)
// Student name (with no binding)
@Html.DisplayFor(m => m.Name)
// Iterate over subjects and questions
for(int i = 0; i < Model.Subjects.Count; i++)
{
// Hidden field for subject identifier (if any)
@Html.HiddenFor(m => m.Subjects[i].ID)
// Display subject name
@Html.DisplayFor(m => m.Subjects[i].Name)
for (int j = 0; j < Model.Subjects[i].Questions.Count; j++)
{
// Hidden field for question identifier
@Html.HiddenFor(m => m.Subjects[i].Questions[j].ID)
// Display question text (with no binding)
@Html.DisplayFor(m => m.Subjects[i].Questions[j].Text)
foreach(var answer in Model.Subjects[i].Questions[j].PossibleAnswers )
{
// Bind radio button to property on QuestionVM
@Html.RadioButtonFor(m => m.Subjects[i].Questions[j].SelectedAnswer, answer.ID, new { id = answer.ID})
<label for="@answer.ID">@answer.Text</label>
}
}
}
// Submit button
<input type="submit" value="save" />
}
Controller:
In the controller action that handles the form submission, you can access the submitted data through the StudentVM model.
[HttpPost]
public ActionResult Edit(StudentVM model)
{
// Save and redirect (not shown)
}
By using view models and the @Html.RadioButtonFor method, you can ensure that each question has a unique name attribute, which will allow radio buttons to be grouped correctly.
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