根据使用 jquery 和 php 在第一个下拉列表中选择的元素，在第二个下拉列表中添加元素

Question

I'm trying to populate Cities as per the State selected by user in dropdown lists.

I've a function in jquery defined as:

function onchange1(dropdownmenu,field_name,id)
{
  alert(field_name);

  $.post(
  'wppb.city.php', 
  { field_name: id},
  function(data) {
    alert(data);
    $('#'+dropdownname).html(data);

    alert("Data Loaded: " + data);
  });   

  alert($('#'+dropdownname).html());
}

and I'm trying to get values from the location where I've called this function. I've called this function in html tags as:

<select name="state" id=state onChange="onchange1(city,state,this.value);">

where city is the name of my 2nd dropdownmenu, state is the field_name and this.value is the id.

But when this function is being called and when alerted it's showing [objectHTMLSelectElement].

How to retrieve values from HTML and use it in jquery function ?

Answer 1

I believe what you want is

$('#'+field_name.id).val()

You might also want to look into serializeObject , a good post is this Convert form data to JavaScript object with jQuery