Ajax表单提交

I am using a cakephp form. I have a dropdown select box. If dropdown value changes then the form should submit.Is there any method similar to form submission like this.form.submit for ajax forms. Any help?

If you use jQuery you could use the .serialize() method and AJAXify a form like this:

$(function() {
    $('#myform').submit(function() {
        $.ajax({
            url: this.action,
            type: this.method,
            data: $(this).serialize(),
            success: function(result) {
                // TODO: process the results
            }
        });
        return false;
    });
});

Another possibility is to use the excellent jQuery form plugin.

You can use dropdown elemnts onChange event

Example

$('.target').change(function() {
  alert('Handler for .change() called.');
});

If jquery is okay for you you can do

$('#myDropdown').change(function() {
    $(this).closest('form').submit();
});

if you want ajax replace line 2 as follows

var myForm = $(this).closest('form');
$.post(myForm.attr('action'), myForm.serialize(), function(data)
{
   /*do something on success*/
}