Question

我的index.php文件正确加载了所有国家/地区，如下图所示：

这也是我在第一次加载中看到的：

<div class="content">
<?php
include("config.php");
?>


<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>

<select name="country" id="country"> 
          <option value="">Select Country</option>
        <?php
       $db = pg_connect("$db_host $db_name $db_username $db_password");
       $query = "SELECT country FROM countries";

       $result = pg_query($query);
        if (!$result) {
            echo "Problem with query " . $query . "<br/>";
          echo pg_last_error();
            exit();
      }

         while($myrow = pg_fetch_assoc($result)) {
            printf ("<option value=$myrow[country_id]>$myrow[country]</option>");
    }
         ?>
</select>
    <br>

<select name="state" id="state">
        <option value="">Select State</option>
</select>
    <br>

<select name="city" id="city">
        <option value="">Select City</option>
</select>


<script type="text/javascript">
$(document).ready(function(){
$('#country').on('change',function(){
    var countryID = $(this).val();
    if(countryID){
        $.ajax({
            type:'POST',
            url:'ajaxData.php',
            data:'country_id='+countryID,
            success:function(html){
                $('#state').html(html);
                $('#city').html('<option value="">Select state first</option>');  
            }
        }); 
    }else{
        $('#state').html('<option value="">Select country first</option>');
        $('#city').html('<option value="">Select state first</option>'); 
    }
});

$('#state').on('change',function(){
    var stateID = $(this).val();
    if(stateID){
        $.ajax({
            type:'POST',
            url:'ajaxData.php',
            data:'state_id='+stateID,
            success:function(html){
                $('#city').html(html);
            }
        }); 
    }else{
        $('#city').html('<option value="">Select state first</option>'); 
    }
});
});
</script>

然后我有ajaxData.php文件如下：

<?php
//Include database configuration file
include("config.php");

if(isset($_POST["country_id"]) && !empty($_POST["country_id"])){
//Get all state data
$query = "SELECT state FROM states WHERE country = ".$_POST['country_id'];

$result = pg_query($query);
        if (!$result) {
            echo "Problem with query " . $query . "<br/>";
          echo pg_last_error();
            exit();
      }

//Count total number of rows
$get_total_rows = pg_numrows($results); 

//Display states list
if($get_total_rows > 0){
    echo '<option value="">Select state</option>';
    while($myrow = pg_fetch_assoc($result)) { 
        echo '<option value="'.$myrow['state_id'].'">'.$myrow['state'].'</option>';
    }
}else{
    echo '<option value="">State not available</option>';
}

}

选择国家/地区后，我会看到以下内容：

由于选择器中的文本已从＆＃34;选择状态＆＃34;到＆＃34;首先选择国家/地区＆＃34;，当$（＆＃39;＃country＆＃39;）on（＆＃39;更改＆＃39;，function（）进入时，它会在我的javascript功能中找到它

else{
        $('#state').html('<option value="">Select country first</option>');
        $('#city').html('<option value="">Select state first</option>');

而不是通过：

    if(countryID){
        $.ajax({
            type:'POST',
            url:'ajaxData.php',
            data:'country_id='+countryID,
            success:function(html){
                $('#state').html(html);
                $('#city').html('<option value="">Select state first</option>');  
            }
        });

显然有些东西不起作用，但我无法看清楚它是什么。

任何帮助将不胜感激。

使用PHP，AJAX，Javascript和postgresql

0 个答案: