如何在 Magento 的默认 adminhtml 表单上使用 Ajax.php？

Question

$event = $fieldset->addField('parent_id', 'select', array(
    'label' => Mage::helper('gallery')->__('Parent'),
    'required' => true,
    'name'=>'parent_id',
    'values'=>$ac,
    'onchange'=>'CheckSelectedItem()',
  )); 
  $event->setAfterElementHtml('<script>
       function CheckSelectedItem()
       {
       var ddllist= window.document.getElementById("parent_id");
       var itemName= ddllist.options[ddllist.selectedIndex].value;

如何使一个ajax调用form.php的文件驻留在根文件夹名为"gallerydata.php"。我有一个名为"画廊"的扩展从后端上传图像。所以我想通过使用ajax从下拉菜单中获取艺术家的id，这使得调用文件"gallerydata.php"

       if(window.XMLHttpRequest)
          {// code for IE7+, Firefox, Chrome, Opera, Safari
          xmlhttp=new XMLHttpRequest();
          xmlhttp1=new XMLHttpRequest();
          }
        else
          {// code for IE6, IE5
          xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
          xmlhttp1=new ActiveXObject("Microsoft.XMLHTTP");
          }
        xmlhttp.onreadystatechange=function()
          {
          if (xmlhttp.readyState==4 && xmlhttp.status==200)
            {
             alert(xmlhttp.responseText);
            }
          }
        xmlhttp.open("GET","http://122.170.97.189:81/electriccityusa/gallerydata.php?q="+itemName,true);
       }
    </script>');     

Answer 1

您可以简单地在adminhtml表单中使用ajax:

$event = $fieldset->addField('parent_id', 'select', array(
    'label'     => Mage::helper('gallery')->__('Parent'),
    'required'  => true,
    'name'      => 'parent_id',
    'values'    => $ac,
    'onchange'  => 'checkSelectedItem(this)',
  )); 
$event->setAfterElementHtml("<script type="text/javascript">
    function checkSelectedItem(selectElement){
        var reloadurl = '". $this->getUrl('your-module-controller-action')."parent_id/' + selectElement.value;
        new Ajax.Request(reloadurl, {
            method: 'get',
            onLoading: function (transport) {
                $('parent_id').update('Searching...');
            },
            onComplete: function(transport) {
                    $('parent_id').update(transport.responseText);
            }
        });
    }
</script>");

现在您可以获取选择值并按照自定义模块控制器动作(在reloadurl中提到)的要求执行操作。