PHP で AJAX を使用して国と都市のドロップダウン メニューを作成しました。彼らは正常に動作します。しかし、問題は、任意の国を選択し、この後にオプションを選択した場合に必要なことです」please select"
都市オプションもに戻ります"please select"
これを行うために ajax コードを変更するにはどうすればよいですか?
<script type="text/javascript">
// <![CDATA[
$(document).ready(function(){
$('#country').change(function(){ //any select change on the dropdown with id country trigger this code
$("#cities > option").remove(); //first of all clear select items
var country_id = $('#country').val(); // here we are taking country id of the selected one.
$.ajax({
type: "POST",
url: "get_cities/"+country_id, //here we are calling our user controller and get_cities method with the country_id
success: function(cities) //we're calling the response json array 'cities'
{
$.each(cities,function(id,city) //here we're doing a foeach loop round each city with id as the key and city as the value
{
var opt = $('<option />'); // here we're creating a new select option with for each city
opt.val(id);
opt.text(city);
$('#cities').append(opt); //here we will append these new select options to a dropdown with the id 'cities'
});
}
});
});
});
// ]]>
</script>
// ドロップダウン選択メニュー
<label for="country">Country: </label>
<select id="country" name="country_id">
<option selected="selected" value="#">Please Select</option>
<?php foreach ($countries as $country) { ?>
<option value="<?= $country['id'] ?>"><?= $country['country_name'] ?></option>
<?php } ?>
</select>
<label for="city">City: </label>
<select id="cities" name="city_id">
<option selected="selected" value="#">Please Select</option>
<?php foreach ($cities as $city) { ?>
<option value="<?= $city['id'] ?>"><?= $city['city_name'] ?></option>
<?php } ?>
</select>