How do I set focus to a text box in Blazor

问题

How do I set focus to a textbox in Blazor? So far the only way we have found is with JavaScript.

回答1:

There is no other way to do it... You can use JSInterop to do this, as follows:

 <input type="text" @ref="myref"/>

 @code {

    private ElementReference myref;
    [Inject] IJSRuntime JSRuntime { get; set; }

     protected override async Task OnAfterRenderAsync(bool firstRender)
    {
         if (firstRender)
        {
            await 
        JSRuntime.InvokeVoidAsync("exampleJsFunctions.focusElement", myref);
        }
   }
 }

JavaScript

<script>

    window.exampleJsFunctions =
    {
        focusElement: function (element) {
           element.focus();
        }
    };
</script>

Hope this helps...

回答2:

.Net 5 make this easy!

<input type="text" @ref="myref"/>

@code {

    private ElementReference myref;

    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        if (firstRender)
        {
            await myref.FocusAsync();
        }
   }
}

来源：https://stackoverflow.com/questions/60309188/how-do-i-set-focus-to-a-text-box-in-blazor