jQuery.ajax()呼叫asp.net後台方法

利用JQuery的$.ajax()可以很方便的呼叫asp.net的後台方法。

先來個簡單的實例熱身吧。

1、無參數的方法呼叫

C#後台程式碼：

using System.Web.Services;
[WebMethod]
    public static string sayHi()
    {
        return "Hi,Welcome to China!";
}

注意：1.方法一定要靜態方法，而且要有[WebMethod]的宣告.

html程式碼：

<div>
        <asp:Button ID="btnClick" runat="server" Text="click me" />
        <br />
        <span id="msg"></span>
 </div>

rr

 運行結果：

透過firebug能很清楚地看到json回傳的資料格式，所以在取資料的時候要data.d。

2、帶參數的方法呼叫

C#後台代碼：

<script type="text/javascript">
        $(document).ready(
        function() {

            $("#btnClick").bind("click", function() {
                $.ajax({
                    type: "post",
                    url: "ajaxHandler.aspx/sayHi",
                    contentType: "application/json; charset=utf-8",
                    dataType: "json",
                    success: function(data) {
                        $("#msg").css("color", "#0000FF").html(data.d);
                    },
                    error: function(err) {
                        $("#msg").css("color", "#FF0000").html("access faield:" + err);
                    }
                });
                return false;
            });

        });
    
</script>

html代碼：

[WebMethod]
    public static string sayHi(string address, string name)
    {
        return "Hi," + address + " " + name;
    }

jQuery代碼：

<div>
        <asp:Button ID="btnClick" runat="server" Text="click me" />
        address:<asp:TextBox ID="txtAddress" runat="server"></asp:TextBox>
        family name:<asp:TextBox ID="txtName" runat="server"></asp:TextBox>
        <br />
        <span id="msg"></span>
</div>

C#後台程式碼：

<script type="text/javascript">
        $(document).ready(
        function() {

            $("#btnClick").bind("click", function() {
                var add = $("#txtAddress").val();
                var txtname = $("#txtName").val();
                $.ajax({
                    type: "post",
                    url: "ajaxHandler.aspx/sayHi",
                    data: "{&#39;address&#39;:&#39;" + add + "&#39;,&#39;name&#39;:&#39;" + txtname + "&#39;}",
                    contentType: "application/json; charset=utf-8",
                    dataType: "json",
                    success: function(data) {
                        $("#msg").css("color", "#0000FF").html(data.d);
                    },
                    error: function(err) {
                        $("#msg").css("color", "#FF0000").html("access faield:" + err);
                    }
                });
                return false;
            });

        });
    
</script>

html程式碼：

[WebMethod]
    public static List<string> sayHi(string address, string name)
    {
        List<string> list = new List<string>();
        for (int i = 0; i < 10; i++)
        {
            list.Add("Hi:" + i.ToString());
        }
        list.Add("Hi:" + address + " " + name);
        return list;
}

jQuery程式碼：

<div>
        <asp:Button ID="btnClick" runat="server" Text="click me" />
        address:<asp:TextBox ID="txtAddress" runat="server"></asp:TextBox>
        family name:<asp:TextBox ID="txtName" runat="server"></asp:TextBox>
        <br />
        <ul id="msg">
        </ul>
</div>

運作結果：

.

C#後台程式碼：

<script type="text/javascript">
        $(document).ready(
        function() {

            $("#btnClick").bind("click", function() {
                var add = $("#txtAddress").val();
                var txtname = $("#txtName").val();
                $.ajax({
                    type: "post",
                    url: "ajaxHandler.aspx/sayHi",
                    data: "{&#39;address&#39;:&#39;" + add + "&#39;,&#39;name&#39;:&#39;" + txtname + "&#39;}",
                    contentType: "application/json; charset=utf-8",
                    dataType: "json",
                    success: function(data) {
                        $("#msg").html("");
                        $(data.d).each(function() {
                            $("#msg").append("<li>" + this + "</li>");
                        });

                        $("#msg").css("color", "#0000FF");
                    },
                    error: function(err) {
                        $("#msg").css("color", "#FF0000").html("access faield:" + err);
                    }
                });
                return false;
            });

        });
    
</script>

html程式碼：

[WebMethod]
    public static SortedList<string, string> sayHi(string address, string name)
    {
        SortedList<string, string> sl = new SortedList<string, string>();
        for (int i = 0; i < 10; i++)
        {
            sl.Add(i.ToString() + "_key", i.ToString() + "_value");
        }
        sl.Add("_key", "_value " + address + " " + name);
        return sl;
    }

jQuery程式碼：

<div>
        <asp:Button ID="btnClick" runat="server" Text="click me" />
        address:<asp:TextBox ID="txtAddress" runat="server"></asp:TextBox>
        family name:<asp:TextBox ID="txtName" runat="server"></asp:TextBox>
        <br />
        <ul id="msg">
        </ul>
</div>

運作結果：

jQuery程式碼：

<script type="text/javascript">
        $(document).ready(
        function() {

            $("#btnClick").bind("click", function() {
                var add = $("#txtAddress").val();
                var txtname = $("#txtName").val();
                $.ajax({
                    type: "post",
                    url: "ajaxHandler.aspx/sayHi",
                    data: "{&#39;address&#39;:&#39;" + add + "&#39;,&#39;name&#39;:&#39;" + txtname + "&#39;}",
                    contentType: "application/json; charset=utf-8",
                    dataType: "json",
                    success: function(data) {
                        $("#msg").html("");

                        //这里只取部分键、值显示
                        $("#msg").append("<li>" + data.d["0_key"] + "</li>");
                        $("#msg").append("<li>" + data.d["1_key"] + "</li>");
                        $("#msg").append("<li>" + data.d["2_key"] + "</li>");
                        $("#msg").append("<li>" + data.d["_key"] + "</li>");


                        $("#msg").css("color", "#0000FF");
                    },
                    error: function(err) {
                        $("#msg").css("color", "#FF0000").html("access faield:" + err);
                    }
                });
                return false;
            });

        });
    
</script>

運行結果：

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