How does Ajax handle data like this? How to call background method? (Why does the response data not display the return string?)

Question

1. Asp.net project, the frontend uses ajax to transfer values ​​to the backend. How can we determine whether there is a method called to the backend? Set a breakpoint and go away at all, and then there is no problem in returning the result, so just respond to the error method directly. Please give me some advice!

page:

Backstage:

Browser:

response:

Answer 1

When you send an ajax request, specify the data type to be received as json 而你后端返回的数据不是json formats. Therefore, it is deemed that the request failed and a failure callback is entered.

And there may be something wrong with your back-end writing. The browser's response is an HTML page?

These places should be response.write('xxxx') right

Thenresponse.end()Let’s

Shouldn’t all backend response data be response.write?

---

Added:

I must have written it wrong

html

    <pre id="test">

    </pre>
    <pre id="test2">

    </pre>
    <script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
    <script>
        $.ajax({
            url: "./test.aspx",
            dataType: 'json'
        }).done(function (data) {
            // 指定为类型为json 则会将数据处理为对象的 即自动JSON.parse 了
            
            $('#test').text('data类型' + typeof data + '\n' + JSON.stringify(data, null, 4));
        }).fail(function () {
            alert('fail');
        });

        $.ajax({
            url: "./test.aspx"
        }).done(function (data) {
            alert('data类型' + typeof data + '\n');
            $('#test2').text('data类型' + typeof data + '\n' + data);
        }).fail(function () {
            alert('fail');
        });
    </script>

test.aspx.cs

protected void Page_Load(object sender, EventArgs e)
{   
    String str = @"[{
    ""guid"": ""410000197812057474"",
    ""name"": ""当进少头等程给进话团拉组层育除水"",
    ""url"": ""mailto://cixus.vg/wvgermuy"",
    ""date"": ""03-25"",
    ""status"": """",
    ""openType"": ""tabsnav""
}, {
    ""guid"": ""42000020111028506X"",
    ""name"": ""张度联酸做电往"",
    ""url"": ""mailto://pslic.sa/mhsgmxqur"",
    ""date"": ""08-08"",
    ""status"": """",
    ""openType"": ""dialog""
}, {
    ""guid"": ""520000199308053591"",
    ""name"": ""政劳则加派党王存才从她"",
    ""url"": ""telnet://lvgoxn.iq/imsfzmfjk"",
    ""date"": ""06-06"",
    ""status"": """",
    ""openType"": ""dialog""
}]";
    Response.Write(str);
    Response.End();
}

Answer 2

ajax removes datatype:json
or Response.Write returns json format data

Answer 3

When returning in the background, change it to:

return {
    success: true
}