How can I submit form data using jquery ajax without submitting the form?

I have a form on my page that I don't want to submit. Here is an example of what I am trying to do basically. When I click on the button, I want to submit an ajax request, but not submitting the form. This is the approximate format of the function that will run when my button is clicked:

function clicked()
{
     try {
            var url = "test.php?t1=1&t2=2"
            var postData = $("#myForm").serializeArray();
            $.ajax(
            {
                url : url,
                beforeSend: function (request)
                {
                  request.setRequestHeader('Content-Type', 'text/html;   charset=utf-8');
                },
                type: "POST",
                data : postData,
                contentType: false,
                processData: false,
                success:function(data, status, xhr) 
                {
                    if(status == "success")
                    {
                        alert(data); 
                       // Do something on page
                    }
                    else
                    { 
                      // Do something on page
                    }
                },
            });  
      } 
     catch (e) 
     {
        alert("Error Adding POI:\n" + e);
     }
}

      

        
        
        
      

    

When I disable the form submission using the preventDefault function, the form is not submitted. However, the form just sends an ajax post request to my url "test.php? T1 = 1 & t2 = 2" without any input from my form. Without warning Default, the form is submitted and navigated away from the page. The ajax request is not being sent. Is there a way to submit form data to the url "test.php? T1 = 1 & t2 = 2" with an ajax request without submitting the form?

Thanks in advance. Any help is appreciated.