I have a form with several fields. One of those fields is an input file field where user can upload a JSON file. 
**My need:** When a button is pressed (not to submit form) I need to grab that input file field and pass it to a function executing it, but without submitting the form itself.

```
<form action=''>
    <input type="text" name="abc">
    <input type="text" name="cde">
    <input type='file' name='import' />
        <button class="button" type='submit' name='restore'>
            <span class="icon-upload"> </span> Restore
        </button>
    <input type="submit" value="Submit">
</form>

```

How can I achieve it?