Trigger event on dialog box open

Question

My dialog box is defined under the div

#dialogbox

When the dialog box opens i want to trigger an event such that it alerts open. The code im us

Answer 1

It will display alert after clicking on the OK button.

$( "#WaitingDialog").html("Message you want to display").dialog({
   modal: true,
   buttons: { 
    Ok: function() {
       alert("hello");
    }
}});

It will display alert after opening the modal

$( "#WaitingDialog").html("Message you want to display").dialog({
    modal: true,
    buttons: { 
        open: function( event, ui ) {
              alert('hello');
          }
    }});