使自动完成在下拉列表上工作并让它填充另一个下拉列表的内容

Question

由于回发问题，我正试图摆脱服务器端控制。我想要两个从数据库中填充的选择框。当页面加载时，我将拥有一个已经从数据库中预填充的组合框：

<select ID="cboCustomers">
   <option value="0">--Select a Sold-to customer--</option>
   <option value="1">Customer1</option>
   <option value="2">Customer2</option>
   <option value="3">Customer3</option>
   <option value="4">Customer4</option>
</select>

<select ID="cboShipTo">
   <option value="0">--Select a Ship-to customer--</option>
</select>

The first dropdown should have autocomplete enabled and when a value is selected, it should use AJAX to populate the second drop down list with Ship-to customers that are available for the selected Sold-to customers.我有一个对象，它将接受参数并返回适当的数据。我的问题是如何完成上述任务。您能否提供一些示例代码或 jsFiddle 来满足我的要求？提前感谢您的帮助！

Answer 1

我遇到了同样的问题，但是在网上找了一些资源。

先做ajax语句：

jQuery

$('#cboCustomers').onchange(function(){
 var $valueTofound = $(this).val();
 $.ajax({
 type: "POST",
 url: "Your URL",
 data: Json.stringify({valueTofound : $valueTofound }), //You will pass data to code behind
 contentType: "application/json; charset=utf-8",
 dataType: "json",
 success: function (data) {
 $.each(jQuery.parseJSON(data.d), function () {
        $("#ddlRecords").append($("<option>  </option>").val(this['ID']).html(this['Name'])); //fill the dropdown
 });
 },
 error: function (msg) {
 //error
 }
 });
});
});

C# 背后的代码

[WebMethod]
     public static string GetResultset(string valueTofound)
     {
       DataTable dataTable = new System.Data.DataTable(); //create a DataTable
       using (SqlConnection sqlConnection = new SqlConnection(ConfigurationManager.ConnectionStrings["MyConnectionString"].ConnectionString))
     {
      try
      {
       SqlDataAdapter sqlDataAdapter = new SqlDataAdapter("DO your Select", sqlConnection);
       sqlDataAdapter.Fill(dataTable);  //Fill the Datatable
       return JsonConvert.SerializeObject(dataTable); //return to Jquery
      }
      catch (Exception ex)
      {
       throw ex;
      }
   }
}

这将对您有所帮助，或者您还有其他页面：

How to fill Dropdown from c# Other page