Why the entire website keeps showing in a modal?

This shows the entire content of the website in the modal.

`<input type=”button” name=”view” value=”view” id=”” class=”btn btn-info btn-xs view_data” />

$(document).ready(function(){
    
 $(document).on('click', '.view_data', function(){
  var product_id = $(this).attr("id");
  var product_name = $("#product_name").val();
    var product_price= $("#product_price").val();
    var quantity = $("#quantity").val();
  $.ajax({
    url:"index.php",
   method:"POST",
   data:{product_id:product_id, product_name: product_name, product_price: product_price, quantity: quantity},
   success:function(data){
    $('#employee_detail').html(data);
    $('#myModal').modal('show');
   }
  });
 });
});`