Dropdownlist selected index change in blazor c#| bind state and city in Blazor

 

Dropdownlist selected index change in blazor c#| bind state and city in Blazor 

To handle the selected index change event of a dropdown list in Blazor, you can follow these steps:

1. Add an event handler method in your Blazor component: Create a method that will be invoked when the selected index of the dropdown list changes.

  csharp

   public partial class MyComponent : ComponentBase

   {

       protected string SelectedOption { get; set; }

       protected void HandleSelectionChange(ChangeEventArgs e)

       {

           SelectedOption = e.Value.ToString();

           // Additional logic based on the selected option

       }

   }

   

2. Wire up the event handler in the dropdown list: In your .razor file, add the `@onchange` attribute to the dropdown list element and set it to the name of the event handler method.

   razor

   <select class="form-control" @onchange="HandleSelectionChange">

       <option value="Option 1">Option 1</option>

       <option value="Option 2">Option 2</option>

       <option value="Option 3">Option 3</option>

   </select>

   <p>Selected option: @SelectedOption</p>

   

   In this example, the `HandleSelectionChange` method is called whenever the selected index of the dropdown list changes. The `ChangeEventArgs` object provides access to the new selected value, which is assigned to the `SelectedOption` property.

3. Use the `SelectedOption` property as needed: You can utilize the `SelectedOption` property to perform further logic or update other parts of your Blazor component based on the selected option.

  csharp

   public partial class MyComponent : ComponentBase

   {

       protected string SelectedOption { get; set; }

       protected void HandleSelectionChange(ChangeEventArgs e)

       {

           SelectedOption = e.Value.ToString();

           // Additional logic based on the selected option

           if (SelectedOption == "Option 1")

           {

               // Perform specific actions for Option 1

           }

           else if (SelectedOption == "Option 2")

           {

               // Perform specific actions for Option 2

           }

           // ... and so on

       }

   }

   

By following these steps, you can handle the selected index change event of a dropdown list in Blazor and perform actions based on the selected option.

Thanks for learning. Happy learning..

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