html post link
<form name="myform" action="handle-data.php" method="post">
<label for="query">Search:</label>
<input type="text" name="query" id="query"/>
<button>Search</button>
</form>
<script>
var button = document.querySelector('form[name="myform"] > button');
button.addEventListener(function() {
document.querySelector("form[name="myform"]").submit();
});
</script>