To make a file input required, use the R validation rule.
Here are some of the attributes needed to validate a file.
ACCEPT
Use this attribute to list out the file extensions allowed for upload.
POSSIBLE VALUES
.png, .jpg, .jpeg
ACCEPT-MIME
Use this attribute to list out the file MIME types allowed for upload. This attribute also supports MIME types with wildcards.
POSSIBLE VALUES
image/png, image/jpg, image/jpeg or image/*
We recommend that you use accept-mime attribute to check for file types of uploaded files, because an end user can rename a file to have an extension outside its original file type.
SIZE
Use this attribute to validate the selected file(s) size. If you provide 5MB, it means that the file selected by the user must be 5MB in size.
It is compatible with both single and multiple file upload inputs.
POSSIBLE VALUES
10MB
MINSIZE
Use this attribute to validate the minimum size of the selected file(s). If you provide 5MB, it means that the file selected by the user must be 5MB in size or more.
It is compatible with both single and multiple file upload inputs.
POSSIBLE VALUES
10MB
MAXSIZE
Use this attribute to validate the maximum size of the selected file(s). If you provide 5MB, it means that the file selected by the user must be 5MB in size or less.
It is compatible with both single and multiple file upload inputs.
POSSIBLE VALUES
10GB
Note that the digital storage supported, ranges from bytes up to petabytes.
FILES
Use this attribute to check the number of files selected by the user. If you provide 5, it means that the user must select 5 files.
This Rule is only supported in multiple file upload input.
POSSIBLE VALUES
5
MINFILES
Use this attribute to check the minimum number of files selected by the user. If you provide 5, it means that the user must select 5 files or more.
This Rule is only supported in multiple file upload input.
POSSIBLE VALUES
10
MAXFILES
Use this attribute to check the maximum number of files selected by the user. If you provide 5, it means that the user must select 5 files or less.
This Rule is only supported in multiple file upload input.
POSSIBLE VALUES
20
| Attribute | Possible values | Custom message |
|---|---|---|
| accept | .png, .jpg, .jpeg | ov-accept-msg |
| accept-mime | image/png, image/jpg, image/jpeg, audio/* | ov-accept-mime-msg |
| size | 20Bytes | ov-size-msg |
| minsize | 5MB | ov-minsize-msg |
| maxsize | 10GB | ov-maxsize-msg |
| files | 5 | ov-files-msg |
| minfiles | 10 | ov-minfiles-msg |
| maxfiles | 30 | ov-maxfiles-msg |