Using jQuery, its rather easy:
$('form .submit-link').on({
click: function (event) {
event.preventDefault();
$(this).closest('form').submit();
}
});
Then you just code as normal, assigning the class submit-link to the form submission links:
<form action="script.php" method="post">
<input type="text" name="textField" />
<input type="hidden" name="hiddenField" value="foo" />
<a href="#" class="submit-link">Submit</a>
</form>
I find this method useful, if you want to maintain an aesthetic theme across the site using links rather than traditional buttons, since there's no inline scripting.
Here's a JSFiddle, although it doesn't submit anywhere.