我正在创建一个Year-Make-Model选择器。
最初,所有三个选择框都被禁用(并且没有选项)。 “年”下拉列表基于通过.get()运行的数据库查询加载,该查询在眨眼之间加载。
选择一年后,将根据所选年份加载一系列品牌。这是它崩溃的地方,而不是加载使得允许在该make下连续加载模型。
可视化:
[Years-----v]
[-Make-----v]
[-Model----v]
选择一年后
[1978------v]
[Makes-----v]
[-Model----v]
以下是我用来完成此任务的JavaScript:
<script type="text/javascript">
$(function() {
// LOAD YEARS
$.get("/ymm/get.php", { func: "get_years", select_name: "year_select" },
function(data){
$("#ymm_year_select").html(data);
});
// LOAD MAKES
$("#year_select").on("change", function() {
var selected_value = $(this).val();
$.get("/ymm/get.php", { func: "get_makes", select_name: "make_select", year: selected_value },
function(data){
$("#ymm_make_select").html(data);
});
});
// LOAD MODELS
$("#make_select").on("change", function() {
var selected_value = $(this).val();
$.get("/ymm/get.php", { func: "get_models", select_name: "model_select", make: selected_value },
function(data){
$("#ymm_model_select").html(data);
});
});
});
</script>
作为参考,这是/ymm/get.php
的样子:
<?php
header("Expires: Mon, 26 Jul 1990 05:00:00 GMT");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
header("Cache-Control: no-store, no-cache, must-revalidate");
header("Cache-Control: post-check=0, pre-check=0", false);
header("Pragma: no-cache");
include("../includes/class/PhpConsole.php");
PhpConsole::start();
include("../includes/configure.php");
include("../includes/class/DB.class.php");
/////////////////////////////////////////////////////////////////////////
function make_select($name, $data, $id = NULL) {
$id = (NULL === $id ? $name : $id);
?>
<select name="<?=$name?>" id="<?=$id?>">
<option>--Select--</option>
<?php
if(!empty($data)) {
foreach($data as $val => $display) {
?>
<option value="<?=$val?>"><?=$display?></option>
<?php
}
}
?>
</select>
<?php
}
$sql['get_years'] = "SELECT DISTINCT(`year`) FROM `ymm` WHERE `id` IN(SELECT `ymm` FROM `ymm_to_products` WHERE `products_id` IS NOT NULL AND `products_id` != '') ORDER BY `year` ASC";
$sql['get_makes'] = 'SELECT DISTINCT(`name`), `id` FROM `make` WHERE `id` IN(SELECT `make_id` FROM `ymm` WHERE `year`=%04d) ORDER BY `name` ASC';
$sql['get_models'] = 'SELECT DISTINCT(`name`), `id` FROM `model` WHERE `make_id`=(SELECT `id` FROM `make` WHERE `name` = \'%s\') ORDER BY `name`';
if(isset($_GET['func'])) {
$func = trim($_GET['func']);
$control_name = $_GET['select_name'];
switch($func) {
case 'get_years':
debug('YEARS!');
$years = DB::select_all($sql['get_years']);
if(false !== $years && !empty($years)) {
foreach($years as $year) {
$year = intval($year['year']);
$data[$year] = $year;
}
}
make_select($control_name, $data);
die();
break;
case 'get_makes':
debug('MAKES!');
$year = (int) $_GET['year'];
$makes = DB::select_all(sprintf($sql['get_makes'], $year));
if(false !== $makes && !empty($makes)) {
foreach($makes as $make) {
$name = $make['id'];
$data[$name] = $make['name'];
}
}
make_select($control_name, $data);
die();
break;
case 'get_models':
debug('MODELS!');
$make = strip_tags(trim($_GET['make']));
$models = DB::select_all(sprintf($sql['get_models'], $make));
if(false !== $models && !empty($models)) {
foreach($models as $model) {
$name = $model['id'];
$data[$name] = $model['name'];
}
}
make_select($control_name, $data);
die();
break;
}
}
?>
它加载了make(和PhpConsole输出“YEARS!”,但从不“MAKES!”或“MODELS!”。
我应该使用jquery的.bind()还是.live()?
我已经回答了我自己的问题。
答案 0 :(得分:1)
您使用的是jquery 1.7,因为.on函数是在1.7中添加的。如果你使用的是旧版本而不是试试这个
$("#make_select").change(function() {
// your existing stuff
});
答案 1 :(得分:1)
事实证明,我需要将.on()事件附加到包含(父)元素,以便它可以“冒泡”或其他任何东西。由于目标元素是从前一个请求动态加载的,因此必须以这种方式完成:
...
// LOAD MAKES
$("#application-search").on("change", "#year_select", function() {
var selected_value = $("#year_select").val();
$.get("/ymm/get.php", { func: "get_makes", select_name: "make_select", year: selected_value },
function(data){
$("#ymm_make_select").html(data);
});
});
// LOAD MODELS
$("#application-search").on("change", "#make_select", function() {
var selected_value = $("#make_select").val();
$.get("/ymm/get.php", { func: "get_models", select_name: "model_select", make: selected_value },
function(data){
$("#ymm_model_select").html(data);
});
});
...