HTML

button functions html

<script>
 function myFunction() {
   alert("ALERT");
 }
</script>
<button onclick="myFunction">Click</button>

how to add function to button in html

<script>
 function myFunction() {
   alert("ALERT");
 }
</script>
<button onclick="myFunction()">Click</button>

add a function to a button

if st.button('add'):
    result = add(1, 2)
    st.write('result: %s' % result)