File Validation
The Upload supports file validation—selected files can be validated against their extensions and size.
Types of Validation
The Upload supports three types of validation:
The following example demonstrates a sample configuration for all the three types of validation.
@(Html.Kendo().Upload()
.Name("files")
.Async(a => a
.Save("ChunkSave", "Upload")
.Remove("Remove", "Upload")
)
.Validation(validation => validation
.AllowedExtensions(new string[] { ".gif", ".jpg", ".png" })
.MaxFileSize(31457280)
.MinFileSize(30720)
)
)
@{
string[] extensions = { ".gif", ".jpg", ".png" };
}
<kendo-upload name="files">
<async save-url="@Url.Action("ChunkSave","Upload")" remove-url="@Url.Action("Remove","Upload")" />
<validation allowed-extensions="@extensions" max-file-size="31457280" min-file-size="30720" />
</kendo-upload>
File Extension
The AllowedExtensions(), which accepts an array of strings listing all file extensions that are allowed. If the user tries to select a file with an extension that is not included in the array, the validation will fail.
Maximum File Size
The MaxFileSize() configuration defines the maximum size in bytes allowed of a file that is intended for upload to the server. If the selected file exceeds the maximum size, a validation error message, such as File size too large., is displayed.
Minimum File Size
Similarly, the MinFileSize() method defines the minimum size in bytes allowed of a file that is intended for upload to the server. If the size of the selected file is less than the minimum size, a validation error message, such as File size too small., is displayed.
Browser Limitations
Internet Explorer versions prior to version 10 provide no information on the file size. As a result, the Upload validation for the MinFileSize() and MaxFileSize() options will not work as expected.