// toast show with javascript
<script>
document.getElementById("liveToastBtn").onclick = function () {
var myToast = document.getElementById('liveToast');//select id of toast
var toastShow = new bootstrap.Toast(myToast);//inizialize it
toastShow.show();//show it
};
</script>
// toast with bootstrap exmaple on instance method
<script>
var toastElList = [].slice.call(document.querySelectorAll('.toast'))
var toastList = toastElList.map(function (toastEl) {
return new bootstrap.Toast(toastEl)
})
var myToastBtn = document.getElementById('liveToastBtn')//target toast btn
var toast = document.getElementById('liveToast')// target toast
var myToast = bootstrap.Toast.getInstance(toast) // Returns a Bootstrap toast instance
myToastBtn.addEventListener('click', function () {
myToast.show();
})// btn click function
</script>