DropdownListEvents ValueChange fires twice when upgrade to 18.4.0.35

[Thinh]

Hi

I've just upgraded from 18.2 to 18.4.0.35 like below:

18.2 code

Child component

<SfDropDownList Placeholder="Select TestLoai"
                @ref="testLoaiDDL"
                Index="@Index" 
                TValue="int?" 
                TItem="TestLoaiDropdownListDto"
                DataSource="testLoaiDropdownList"
                AllowFiltering="true"
                FilterType="@Syncfusion.Blazor.DropDowns.FilterType.Contains"
                ShowClearButton="true"
                Width="@Width" 
                PopupWidth="@PopupWidth"
             
                >
    <DropDownListFieldSettings  Text="Name" Value="Id">       
    </DropDownListFieldSettings>
   
  <DropDownListEvents TValue="int?" ValueChange="ValueChange"></DropDownListEvents>


</SfDropDownList>

...

[Parameter]
public int? Value { get; set; } = 1;

[Parameter]
public EventCallback<int?> ValueChanged { get; set; }

private void ValueChange(Syncfusion.Blazor.DropDowns.ChangeEventArgs<int?> args)
{
    Value =  args.Value;
    ValueChanged.InvokeAsync(Value);
}
Parent component
<TestLoaiDropdownList @bind-Value="testLoaiIdFilter" Width="100%" PopupWidth="auto"></TestLoaiDropdownList>
18.4.0.35 code is the same as the old one except for:
Child component
...
<DropDownListEvents TValue="int?" TItem="TestLoaiDropdownListDto" ValueChange="ValueChange"></DropDownListEvents>
...
private void ValueChange(Syncfusion.Blazor.DropDowns.ChangeEventArgs<int?, TestLoaiDropdownListDto> args)
{

    Value =  args.Value;
    ValueChanged.InvokeAsync(Value);

}
and ValueChange always fires twice. How to fix this?

[Ponmani Murugaiyan]

Hi Thinh, 

Greetings from Syncfusion support. 

Currently we are checking the reported query. We will check and update further details in 2 business days (January 28, 2021). We appreciate your patience until then. 

Regards, 

Ponmani M 

[Sureshkumar P]

Hi Thinh, 

 

Thanks for your patience. 

 

We have validated your attached code example with shared information. in our latest version 18.4.35 we get only one-time change event triggers. We suggest you to use @bind-index property instead of index and also please check the below attached sample to resolve the issue. 

 

Sample link: https://www.syncfusion.com/downloads/support/forum/161823/ze/DropDownDataSource-598470849  

 

If still you have facing the issue, then please update your current parent and child component code example or replicate the reported issue from the above attached sample and revert us with replication procedure. These details will help us to provide exact solution as earlier as possible. 

 

Regards, 

Sureshkumar P 

[Thinh]

Dear Sureshkumar

 

I changed to bind-Index and it works fine. Thank you.

Best Regards.

[Vignesh Srinivasan]

Hi Thinh, 

 

You are welcome. 

We are glad to know that the provided solutions worked for you. Please contact us if you require any further assistance. 

Regards, 

 

Vignesh Srinivasan