如何提交多个下拉变更

Question

So i have created Four dropdown list on index.php

<select name="filter_month" class="filters">
    <option>Select a Month</option>
    <option value="1">January</option>
    <option value="2">February</option>
    ....
</select>
<select name="filter_year" class="fitlers">
    <option>Select a Year</option>
    <option value="2015">2015</option>
    <option value="2016">2016</option>
</select> 
<select name="filter_category" class="filters">
    <option>Select a Category</option>
    <option value="1">Running</option>
    <option value="2">Trail Running</option>
</select>
<select name="filter_country" class="filters">
    <option>Select a Country</option>
    <option value="1">Canada</option>
    <option value="2">United States</option>
</select>

Now what i wont to do is create a filter with each selected values from dropdown and send post to filters.php

$(function) {

   $('.filters').on('change', function(){
      // How send value from each Dropdown?
   });

} 

on filters.php i have created this code, how return data if i have selected any of these options ($mm, $yy, $cat ,$country)

<?php 

if ($_SERVER['REQUEST_METHOD'] === 'POST') {

   $mm      = $_POST['filter_month'];
   $yy      = $_POST['filter_year'];
   $cat     = $_POST['filter_category'];
   $country = $_POST['filter_country'];

   // ... connection to database 
   $query = "how can filter by month, year, category and country";
   // ... Execute query
   // ... while ...
   echo $query; 
  // ... end while ...
}

Thank you!

Answer 1

You should put the selects in a HTML form (for example with id myForm and send it with jQuery.

$(function) {
    $('.filters').on('change', function(){
        $('#myForm').submit();
    });
}