利用ProtoType框架完成的一个下拉框(asp:DropDownList)联动的AJAX例子

【 tulaoshi.com - Javascript 】

 
最近终于有时间研究研究AJAX了.看了一些AJAX的介绍.
用ProtoType框架完成的一个下拉框(asp:DropDownList)联动的AJAX的小例子,和初学者分享一下.
代码下载

<script language="javascript" type="text/javascript" 
<!--
function goCity()
{
        var url = "AreaHandler.ashx";
        var father= $F(’<%=ddlProvince.ClientID%’)
        var pars = "ddl=province&father=" +father;
        var myAjax = new Ajax.Request(
                    url,
                    {method: ’get’, parameters: pars, onComplete: LoadCity}
                    );
          
                
}
function goArea()
{
    var url = "AreaHandler.ashx";
    
    var father= $F(’<%=ddlCity.ClientID%’)
            var pars = "ddl=city&father=" +father;
        var myAjax = new Ajax.Request(
                    url,
                    {method: ’get’, parameters: pars, onComplete: LoadArea}
                    );
}
  function LoadCity(originalRequest)
    {
    var result=originalRequest.responseText;
    var ddl=$(’<%=ddlCity.ClientID%’)
       FillDropDown(ddl,result);
        if (ddl.length == 0){
        $(’<%=ddlArea.ClientID%’).length=0;
       $(’<%=ddlArea.ClientID%’).disabled = 1;
       ddl.disabled = ’true’;
             }
       else{
   $(’<%=ddlArea.ClientID%’).disabled = 0; [next]
       ddl.disabled = 0;
       goArea();
    }
    }
  function LoadArea(originalRequest)
    {
     var result=originalRequest.responseText;
     var ddl=$(’<%=ddlArea.ClientID%’)
       FillDropDown(ddl,result);
       
       if (ddl.length == 0)
         ddl.disabled =1;
         esle
         ddl.disabled =0;