OnChange is not working in InputFile Tag in balzor web assembly. LoadFiles is not getting called when I uploaded a file. InputFileChangeEventArgs is not working and breakpoint is not getting hit when a file is uploaded. I have used blazor web app to create this and want to upload an excel which will then show data into the page.
@page "/weather"
@attribute [StreamRendering]
@using System
@using System.IO
@using Microsoft.AspNetCore.Hosting
@inject IWebHostEnvironment Environment
<PageTitle>File Upload 1</PageTitle>
<h1>File Upload Example 1</h1>
<p>
<label>
Max file size:
<input type="number" @bind="maxFileSize" />
</label>
</p>
<p>
<label>
Max allowed files:
<input type="number" @bind="maxAllowedFiles" />
</label>
</p>
<p>
<label>
Upload up to @maxAllowedFiles of up to @maxFileSize bytes:
<InputFile OnChange="LoadFiles" multiple />
</label>
</p>
@if (isLoading)
{
<p>Uploading...</p>
}
else
{
<ul>
@foreach (var file in loadedFiles)
{
<li>
<ul>
<li>Name: @file.Name</li>
<li>Last modified: @file.LastModified.ToString()</li>
<li>Size (bytes): @file.Size</li>
<li>Content type: @file.ContentType</li>
</ul>
</li>
}
</ul>
}
@code {
private List<IBrowserFile> loadedFiles = new();
private long maxFileSize = 1024 * 15;
private int maxAllowedFiles = 3;
private bool isLoading;
private async Task LoadFiles(InputFileChangeEventArgs e)
{
isLoading = true;
loadedFiles.Clear();
foreach (var file in e.GetMultipleFiles(maxAllowedFiles))
{
try
{
var trustedFileName = Path.GetRandomFileName();
var path = Path.Combine(Environment.ContentRootPath,
Environment.EnvironmentName, "unsafe_uploads",
trustedFileName);
await using FileStream fs = new(path, FileMode.Create);
await file.OpenReadStream(maxFileSize).CopyToAsync(fs);
loadedFiles.Add(file);
}
catch (Exception ex)
{
}
}
isLoading = false;
}
}
You need to use interactive server instead of ssr and stream rendering.
@rendermode InteractiveServer
This is not wasm. You can also use wasm, but in that case you have to move the component to client project.