is there a trick in html to call JS function() with the input value, like here :
example: here I want to call show_name( with the input[user_name] value )
Note: I don't wanna use JS
<form>
<label>Enter your name :</label>
<input type='text' name='user_name'>
<button type='submit' onclick='show_name( [want to get input value here] )' >Submit</button>
</form>