extension method

Makes the element require a certain file extension.

Description

Returns true if the value ends with one of the specified file extensions. If nothing is specified, only images are allowed (png, jpeg, gif). Works with text inputs. Part of the additional-methods.js file

Usage

`extension( extension )`

extension (String) (optional)

The allowed file extensions, seperated with “

” (or a comma, “,”), defaults to “png

jpe?g

gif”.

Examples

Makes “field” required and ending with “.xls” or “.csv”.

$( "#myform" ).validate({
  rules: {
    field: {
      required: true,
      extension: "xls|csv"
    }
  }
});

<label for="field">Required, only .xls and .csv files allowed: </label>
<input type="file" class="left" id="field" name="field">
<br/>
<input type="submit" value="Validate!">