Progress Telerik UI for Blazor
Blazor File Upload
- The Blazor Upload component lets users select and upload files asynchronously from their local file systems to dedicated server handlers. Comes with a rich events list, application logic and file validation.
- This component is part of the largest truly native Blazor component suite - Telerik UI for Blazor designed to perfectly fit in any app’s requirement.
- The Blazor UI suite also comes with professionally designed themes enabled with a flip of a switch, document processing library, rich docs & demos to help you get started in no time.
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Blazor File Upload Overview
Many Blazor application require single or multiple files upload - images, documents, audio, video, and other files - as their core functionality. The Blazor Upload Component enables you to easily build asynchronous file upload and offers auto upload, multiple configuration options, file upload progress indication, validation, and events out of the box. With just a couple of lines of code your file upload requirements are implemented in both Blazor WebAssembly (WASM) and Server-side Blazor apps.
Demo of Upload Component with built-in validation and progress indicator.
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Single and Multiple Upload of Files in Blazor
Users can select single or multiple files and upload them at the same time, which is quite useful when uploading large number of documents to a file sharing application, or images to a gallery. In addition to that, for large files you can monitor the progress of the uploaded files. Upon file upload you are presented with option to remove specific files that were part of the initial selection but are not relevant.
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File Upload Validation
The File Upload control offers several built-in parameters to help you easily perform validation of the selected files on the client. You can set restrictions to the allowed size using MinFileSize and MaxFileSize properties, or file format using the AllowedExtensions parameter
Demo of file upload validation scenarios with the Blazor Upload component.
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Upload Events
File uploads often require handling of both selected and uploaded files, and various steps of the file upload process. The Upload UI control comes handy with a long list of exposed events to help you easily handle various scenarios and have full control over the uploading. The events arguments provide list of the files, corresponding actions (upload, deletion etc.) and access to the request objects so you can provide metadata to the server (such as authentication information).
- OnSelect - fires every time the user selects new files for upload.
- OnUpload - fires when files will be uploaded and allows you to add custom metadata with the upload request such as authentication tokens.
- OnRemove - fires when the users click the [x] button of an uploaded file. It sends a request to the server so you can clean up the file the user changed their mind about.
- OnProgress - fires each time a file makes progress in its upload process.
- OnSuccess - fires each time a request is successful - either an upload of a file, or the deletion of a file.
- OnError - fires each time a request fails - either an upload of a file, or the deletion of a file.
- OnCancel - fires when the user clicks the "Cancel" button on a file that is currently uploading.
- OnClear - fires when the user clicks the "Clear" button.
Demo of Upload Component events.
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Upload Theming
The Telerik Blazor Upload component has several built-in themes such as Default (our own styling), Material (based on the Material Design guidelines) and Bootstrap (which looks like the Bootstrap styling to integrate better). You can easily customize any of out-of-the-box themes with a few lines of CSS, or create new theme to match your colors and branding by using the Telerik SASS ThemeBuilder application.
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Custom Upload of FIles
Telerik FileUpload also exposes methods in the component API for triggering upload, file select dialog, as well as the ability to clear successfully uploaded files.
See example how to programmatically clear the files, open the file select dialog, and upload files in Blazor apps.
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Keyboard Navigation
Users can use the arrow keys to navigate between the uploaded files, retry a failed file upload, cancel an upload in progress or delete an already uploaded file—all without taking their hands off the keyboard.
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Upload Globalization and Localization
The Upload control has built-in localization support, which makes it easy to localize your Blazor upload to any language that your app may require.
Next Steps
See Telerik UI for Blazor in action and check out how much it can do out-of-the-box.
Try Telerik UI for Blazor with dedicated technical support.