You need to do this.
$('input[type="submit"]').on('click', function(){
$(this).next().get(0).click();
})
Clicking on the submit
, trigger
an click
for the next element which is hyper link
in this case.
As you have a class on the href you could do this too.
$('input[type="submit"]').on('click', function(){
$('.ddownload-button').get(0).click();
})
$('input[type="submit"]').on('click', function() {
$(this).next().get(0).click();
})
$('a').on('click', function() {
alert('Ram clicked')
})
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="submit" value="Try a sample" class="wpcf7-form-control wpcf7-submit">
<a href="<?php echo get_template_directory_uri()?>/pdf/AttackonNantucket.pdf" class="ddownload-button" download>Ram</a>