如何使用Jquery Ajax调用填充DropDown

本文关键字：填充 DropDown 调用 Ajax 何使用 Jquery | 更新日期: 2023-09-27 17:57:36

我有一个WebMethod，它获取要在数据集中填充DropDown的数据。目前，我正在使用硬编码对象填充下拉列表。但是我想用webmethod返回的数据替换这个硬编码的对象。

 [System.Web.Services.WebMethod]
         public static string GetDropDownDataWM(string name)
         {
             //return "Hello " + name + Environment.NewLine + "The Current Time is: "
             //    + DateTime.Now.ToString();
             var msg = "arbaaz";
             string[] name1 = new string[1];
             string[] Value = new string[1];
             name1[0] = "@Empcode";
             Value[0] = HttpContext.Current.Session["LoginUser"].ToString().Trim();
             DataSet ds = new DataSet();
             dboperation dbo = new dboperation();
             ds = dbo.executeProcedure("GetDropDownsForVendor", name1, Value, 1);
             return ds.GetXml(); 
         }

客户端（更新1）：

  <script type = "text/javascript">
    function GetDropDownData() {
        var myDropDownList = $('.myDropDownLisTId');
        $.ajax({
            type: "POST",
            url: "test.aspx/GetDropDownDataWM",
            data: '{name: "abc" }',
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function (data) {
                $.each(jQuery.parseJSON(data.d), function () {
                    myDropDownList.append($("<option></option>").val(this['FieldDescription']).html(this['FieldCode']));
                });
            },
            failure: function (response) {
                alert(response.d);
            }
        });
    }
    function OnSuccess(response) {
        console.log(response.d);
        alert(response.d);
    }
</script>

如何使用Jquery Ajax调用填充DropDown

function GetDropDownData() {
    $.ajax({
        type: "POST",
        url: "test.aspx/GetDropDownDataWM",
        data: '{name: "abc" }',
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function(data.d)
                {
                    $.each(data.d, function (){
                        $(".myDropDownLisTId").append($("<option     />").val(this.KeyName).text(this.ValueName));
                    });
                },
        failure: function () {
            alert("Failed!");
        }
    });
}

 var theDropDown = document.getElementById("myDropDownLisTId");
                theDropDown.length = 0;
                $.each(items, function (key, value) {
                    $("#myDropDownLisTId").append($("<option></option>").val(value.PKId).html(value.SubDesc));

这里的"SubDesc"，PKId描述了从数据库中取出的值。，你需要将你的价值从数据集中分离出来。

从WebMethod，不要直接发送DataSet，发送XML。。。

[System.Web.Services.WebMethod]
public static string GetDropDownDataWM(string name)
{
    DataSet ds = new DataSet();
    ds.Tables.Add("Table0");
    ds.Tables[0].Columns.Add("OptionValue");
    ds.Tables[0].Columns.Add("OptionText");
    ds.Tables[0].Rows.Add("0", "test 0");
    ds.Tables[0].Rows.Add("1", "test 1");
    ds.Tables[0].Rows.Add("2", "test 2");
    ds.Tables[0].Rows.Add("3", "test 3");
    ds.Tables[0].Rows.Add("4", "test 4");
    return ds.GetXml();
}

在Ajax调用之前。。。

var myDropDownList = $('.myDropDownLisTId');

尝试如下。。。（内部Ajax调用）

success: function (response) {
    debugger;
    $(response.d).find('Table0').each(function () {
           var OptionValue = $(this).find('OptionValue').text();
           var OptionText = $(this).find('OptionText').text();
           var option = $("<option>" + OptionText + "</option>");
           option.attr("value", OptionValue);
           myDropDownList.append(option);
     });
},

注意：

  1. CCD_ 4和CCD_ 5是CCD_。

  2. $(response.d).find('Table0').each(function (){})-此处为Table0是DataSet中表的名称。

[System.Web.Services.WebMethod]
     public static string GetDropDownDataWM(string name)
     {
         //return "Hello " + name + Environment.NewLine + "The Current Time is: "
         //    + DateTime.Now.ToString();
         var msg = "arbaaz";
         string[] name1 = new string[1];
         string[] Value = new string[1];
         name1[0] = "@Empcode";
         Value[0] = HttpContext.Current.Session["LoginUser"].ToString().Trim();
         DataSet ds = new DataSet();
         dboperation dbo = new dboperation();
         ds = dbo.executeProcedure("GetDropDownsForVendor", name1, Value, 1);
         return DataSetToJSON(ds); 
     }
public static string DataSetToJSON(DataSet ds)
{
    Dictionary<string, object> dict = new Dictionary<string, object>();
    foreach (DataTable dt in ds.Tables)
    {
        object[] arr = new object[dt.Rows.Count + 1];
        for (int i = 0; i <= dt.Rows.Count - 1; i++)
        {
            arr[i] = dt.Rows[i].ItemArray;
        }
        dict.Add(dt.TableName, arr);
    }
    var lstJson = Newtonsoft.Json.JsonConvert.SerializeObject(dict);
    return lstJson;
}

Ajax调用

function GetAssociation() {
        var myDropDownList = $("#myDropDownLisTId");
        var post_data = JSON.stringify({ "name": "xyz"});
        $.ajax({
            type: "POST",
            url: "test.aspx/GetDropDownDataWM",
            data: post_data,
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function (response) {
                json_data = JSON.parse(response.d);
                myDropDownList.empty();
                for(i=0; i<json_data.Table.length; i++)
                {
                    myDropDownList.append($("<option></option>").val(json_data.Table[i][0]).html(json_data.Table[i][1]));
                }
            },
            failure: function (response) {
                alert(response.d);
            }
        });
    }

// We can bind dropdown list using this Jquery function in JS script
   
function listDropdownBind() {
  var requestId = 123; 
    $.ajax({
        type: "POST",
        url: "/api/ControllerName/ActionName?param=" + param, // call API with parameter
        headers: { 'rId': requestId },
        dataType: "json",
        contentType: "application/json; charset=utf-8",
        success: function (data) {
            var optionhtml1 = '';
            var optionhtml1 = '<option value="' +
                0 + '">' + "--Select--" + '</option>';
            $("#ddlName").append(optionhtml1);
            $.each(data, function (i) {
                var optionhtml = '<option value="' +
                    data.d[i].Value + '">' + data.d[i].Text + '</option>';
                $("#ddlName").append(optionhtml);
            });
        }
    });
};
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