Calling a 'WebMethod' with jQuery in ASP.N

2019-01-03 00:17发布

站内问答 / jQuery
1471 4 5

I've set a breakpoint in the following WebMethod but I'm never hitting the breakpoint.

cs:

[WebMethod]
public static string search()
{
    return "worked";
}

aspx:

  function search() {
    $.ajax({
        type: "POST",
        url: "ProcessAudit/req_brws.aspx/search",
        data: "{}",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function (msg) {
            alert(msg)
        }
    });
}

<button id = "btnSearch" onclick = "search()" >Search</button>

4条回答
再贱就再见
2楼-- · 2019-01-03 00:35

Make sure that you have enabled page methods in your ScriptManager element:

<asp:ScriptManager ID="scm" runat="server" EnablePageMethods="true" />

and that you have canceled the default action of the button by returning false inside the onclick handler, otherwise the page performs a full postback and your AJAX call might never have the time to finish. Here's a full working example:

<%@ Page Language="C#" %>
<script type="text/c#" runat="server">
[System.Web.Services.WebMethod]
public static string search()
{
    return "worked";
}
</script>

<!DOCTYPE html>
<html>
<head id="Head1" runat="server">
    <title></title>
</head>
<body>
    <form id="Form1" runat="server">
        <asp:ScriptManager ID="scm" runat="server" EnablePageMethods="true" />
        <button id="btnSearch" onclick="search(); return false;" >Search</button>
    </form>

    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"></script>
    <script type="text/javascript">
        function search() {
            $.ajax({
                type: 'POST',
                url: '<%= ResolveUrl("~/default.aspx/search") %>',
                data: '{ }',
                contentType: 'application/json; charset=utf-8',
                dataType: 'json',
                success: function (msg) {
                    alert(msg.d)
                }
            });
        }
    </script>
</body>
</html>

Another possibility is to subscribe to the click handler unobtrusively:

<button id="btnSearch">Search</button>

and then inside a separate javascript file:

$('#btnSearch').click(function() {
    $.ajax({
        type: 'POST',
        url: '<%= ResolveUrl("~/default.aspx/search") %>',
        data: '{ }',
        contentType: 'application/json; charset=utf-8',
        dataType: 'json',
        success: function (msg) {
            alert(msg.d)
        }
    });
    return false;
});

You might also notice the usage of the msg.d property inside the success callback which ASP.NET uses to wrap the entire response into as well as the usage of the ResolveUrl method to properly generate the url to the page method instead of hardcoding it.

查看更多
0人赞 添加讨论(0) 举报
做个烂人
3楼-- · 2019-01-03 00:37

A more optimised call will be

function search() {
    $.ajax({
        type: "POST",
        url: '<%= ResolveUrl("~/ProcessAudit/req_brws.aspx/search") %>',
        data: "{}",
        contentType: "application/json",
        success: function (msg) {
            msg = msg.hasOwnProperty("d") ? msg.d : msg;
            alert(msg);
        }
    });
}

No need to provide a asp:ScriptManager at all.

Resource: http://encosia.com/using-jquery-to-directly-call-aspnet-ajax-page-methods/

查看更多
0人赞 添加讨论(0) 举报
我只想做你的唯一
4楼-- · 2019-01-03 00:41

How to implement ASP.Net web method using JQuery AJAX ?

HTML Page:

<html xmlns="http://www.w3.org/1999/xhtml">
<head>

    <title></title>
    <script src="js/jquery.min.js"></script>
    <script>
        function SubmitData() {

            var name = 'Ram';
            var gender = 'Male';
            var age = '30';           

            $.ajax({
                type: "POST",
                url: "ajaxcall.aspx/SaveData",
                data: '{"name":"' + name + '", "gender":"' + gender + '", "age":"' + age + '"}',
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                beforeSend: function () {
                    $('#loader').show();
                },
                success: function (data) {

                    alert(data.d);
                    $('#loader').hide();
                },
                error: function (msg) {
                    //alert('3');
                    msg = "There is an error";
                    alert(msg);
                    $('#loader').hide();
                }
            });

        }
    </script>
</head>
<body>
    <div id="loader" style="display: none;">
        <img src="ajax-loader.gif" />
    </div>
    <a href="#" onclick="SubmitData();">Submit</a>
</body>
</html>

Code behind:

[WebMethod]
    public static string SaveData(string name, string gender, string age) {
    try {
        return "OK";
    } catch (Exception ex) {
        return ex.Message;
    } finally { }
}

Resource: http://www.sharepointcafe.net/2016/10/how-to-call-aspnet-web-method-using-jquery-ajax.html

查看更多
0人赞 添加讨论(0) 举报
唯我独甜
5楼-- · 2019-01-03 00:49

Your current button is causing a full postback. Simply add a type="button" to your button to avoid this.

 <button id = "btnSearch" type="button" onclick = "search()" >Search</button>

-Shazzam yo

查看更多
0人赞 添加讨论(0) 举报
登录 后发表回答
相关问题
查看全部
相关文章
查看全部
收藏的人(5)