我是 Zend 的新手，很难掌握如何使用 Ajax 动态填充下拉菜单。我创建了一个未使用 Zend 框架的工作版本，但现在证明将我的代码放入 Zend 比我原先想象的要困难得多。当我尝试运行我的应用程序时，Chrome 的开发者工具向控制台输出:
GET http://example.com/crm/getcities.php?name=CDS%20Midwinter%20Meeting 404 (Not Found)tradeshowOptions @ tradeshows:423onchange @ tradeshows:484
在我的应用程序 Controller 文件夹中，我有一个名为 CrmController.php 的 Controller ，如下所示:
<?php
class CrmController extends Zend_Controller_Action {
public function init() {
if(!Zend_Auth::getInstance()->getIdentity() || !in_array('crm', unserialize(Zend_Auth::getInstance()->getIdentity()->permission))){
$this->_helper->redirector('index', 'fm');
}
$this->view->headLink()->appendStylesheet('/public/css/crm.css');
$this->_auth = Zend_Auth::getInstance()->getIdentity();
$this->_users = new Application_Model_User;
$this->_crms = new Application_Model_Crm;
$this->_products = new Application_Model_Product;
$this->_helper->ajaxContext->addActionContext('crm', 'html')
->initContext();
}
public function tradeshowsAction()
{
}
我有一个名为 tradeshows.phtml 的 View ，它看起来像:
<?php require_once('config.php'); ?>
<div class="row">
<div class="col-lg-12">
<h2 class="page-header">Sales CRM</h2>
<ol class="breadcrumb">
<li><a href="/crm/prospect">Leads</a></li>
<li><a href="/crm/prospect">Prospects</a></li>
<li><a href="/crm/accounts">Accounts</a></li>
<li><a href="/crm/activity">Activities</a></li>
<li class="active">Tradeshows</li>
</ol>
</div>
</div>
<h3>Tradeshows</h3>
<script>
var name = "";
var city = "";
var year = "";
// Gets the list of cities to populate the second drop down.
function tradeshowOptions(tsname) {
name = tsname;
if (tsname == "") {
document.getElementById("txtHint").innerHTML = "";
return;
} else {
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp = new XMLHttpRequest();
} else {
// code for IE6, IE5
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
document.getElementById("txtHint").innerHTML = xmlhttp.responseText;
}
};
xmlhttp.open("GET","getcities.php?name="+name,true);
xmlhttp.send();
name = tsname;
console.log(name);
}
}
// Get the list of cities to populate the third drop down.
function yearOptions(tscity) {
city = tscity;
if (tscity == "") {
document.getElementById("txtHint2").innerHTML = "";
return;
} else {
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp = new XMLHttpRequest();
} else {
// code for IE6, IE5
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
document.getElementById("txtHint2").innerHTML = xmlhttp.responseText;
}
};
xmlhttp.open("GET","get_year.php?name="+name+"&city="+city,true);
xmlhttp.send();
city = tscity;
console.log(name + " " + city);
}
}
// Get the data list.
function dataSet(tsyear) {
year = tsyear;
if (tsyear == "") {
document.getElementById("txtHint3").innerHTML = "";
return;
} else {
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp = new XMLHttpRequest();
} else {
// code for IE6, IE5
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
document.getElementById("txtHint3").innerHTML = xmlhttp.responseText;
}
};
xmlhttp.open("GET","get_data.php?name="+name+"&city="+city+"&year="+year,true);
xmlhttp.send();
console.log(name + " " + city + " " + year);
}
}
</script>
<form>
Select Tradeshow:
<select name="shows" onchange="tradeshowOptions(this.value)">
<option value="">Select a Tradeshow:</option>
<?php
$sql = 'SELECT * FROM tradeshows GROUP BY name ORDER BY name asc;';
$i = 0;
foreach ($conn->query($sql) as $row) {
echo "<option value='$row[name]'>$row[name]</option>";
$i++;
}
?>
</select>
</form>
<br>
<div id="txtHint"> </div>
<div id="txtHint2"> </div>
<div id="txtHint3"> </div>
<link href='/public/css/crm.css' rel='stylesheet' />
最后但并非最不重要的一点是，我有我的 getcities.php 文件，但我不知道该放在哪里。我也试过将其命名为 getcities.ajax.phtml 并将其放入 View 中，但似乎没有任何效果。
<!DOCTYPE html>
<html>
<head></head>
<body>
<form>
Select City:
<select name="cities" onchange="yearOptions(this.value)">
<option>Please select a city...</option>
<?php
// Database Connection
require('config.php');
// Global Variables from _GET
$name = strval($_GET['name']);
// MySQL Query
$sql = "SELECT * FROM tradeshows WHERE name LIKE '$name' GROUP BY city ORDER BY city asc;";
// Output Each MySQL Result in Dropdown Menu
$i = 0;
foreach ($conn->query($sql) as $row) {
echo "<option value='$row[city]'>$row[city]</option>";
$i++;
}
?>
</select>
</form>
</body>
</html>
请随意撕开我的代码。我真的很想学习。另外，我意识到我的代码不是那么干，如果有人可以提供一些建议，我将不胜感激。
谢谢!
最佳答案
您可能会考虑查看 MVC 模式指南，Zend Framework 围绕该模式构建:https://softwareengineering.stackexchange.com/questions/127624/what-is-mvc-really .
我建议您了解 MVC，否则您将与框架作斗争，将代码塞到它不想出现的地方。例如，getcities.php 是应该分离为模型类、 View 脚本和 Controller 操作的东西的组合。您不知道将此文件放在哪里，因为它确实不属于您的应用程序。
这是我要采用的方法...首先，让我们创建一个示例 Controller ，用于响应对城市列表的 AJAX 请求:
<?php
class NewController extends Zend_Controller_Action
{
public function init()
{
$contextSwitch = $this->_helper->getHelper('contextSwitch');
// The helper will detect a request for JSON and setup the getcities
// action to return JSON automatically. No view script required.
$contextSwitch->addActionContext('getcities', 'json')->initContext();
}
public function getcitiesAction()
{
// Instantiate cities model.
$cities_model = new Application_Model_Cities();
// Get list of cities by simply getting all records.
$cities_list = $cities_model->getCities();
// JSON helper will emit all view variables in JSON format.
$this->view->cities_list = $cities_list;
}
}
接下来，创建一个模型来表示和返回您的城市列表:
/**
* Model class to represent cities and interact with database.
*
*/
class Application_Model_Cities extends Zend_Db_Table_Abstract
{
// Tell the class what table to use.
protected $_name = 'tradeshows';
public function getCities($name = false)
{
if($name === false){
// If no name supplied, match all.
$name = '%';
}
$sql = 'SELECT * FROM tradeshows WHERE name LIKE ? GROUP BY city ORDER BY city asc';
return $this->getAdapter()->fetchAll($sql,$name);
}
}
将模型类放在应用程序的“模型”目录中。看起来您目前正在 config.php 中手动连接到您的数据库。您应该考虑使用 Zend DB 引导您的数据库连接。我的示例模型依赖于默认数据库连接:Registering Zend Database Adapter in Registry
您可以像这样通过 URL 调用上面的代码:http://example.com/crm/getcities/format/json您应该会看到以 JSON 格式显示的城市列表。
我认为这应该足以让您指明正确的方向。不要在生产中使用此代码，我已采取一些快捷方式来简化此示例的操作。
关于php - 使用 Zend (1.12.17) 和 Ajax 的动态下拉列表，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/34867999/