c# - jQuery AJAX 调用返回 null 响应时间到时间

Question

我的页面上有一个链接，它创建一个 AJAX 调用页面本身并返回一个值。成功创建的服务器生成的响应变为空或有时是 AJAX 的错误功能。我几乎尝试了所有方法，但无法提出解决方案。

这是我的 AJAX 函数:

var Ajax = {
    AjaxCall: function (uri, jsonData, callBack, postParams) {
        $.ajax({
            cache: false,
            type: "POST",
            url: uri + ((uri.indexOf("?") > -1) ? "&" : "?") + "rand=" + new Date().format("ssmmHHddMMyyyy"),
            data: JSON.stringify(jsonData),
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function (msg) {
                Ajax.AjaxCall_CallBack(msg, callBack, postParams);
            },
            error: function (msg) {
                Ajax.AjaxCall_CallBack_Error(msg);
            }
        });
    },

    AjaxCall_CallBack: function (msg, callBack, postParams) {
        callBack(msg, postParams);
    },

    AjaxCall_CallBack_Error: function (msg) {
        alert(msg.responseText);
    }
}

并且该函数进行 AJAX 调用

Ajax.AjaxCall('dummypage.aspx?ajax=6&edit=1&uID=' + uID, null, callback_func, [uID, 'Test Text', 0])

从服务器生成的值是这样的:

Table tbl;
TableRow tr;
TableCell tc;
Label lbl;
DropDownList ddl;

tbl = new Table();
tr = new TableRow();

tc = new TableCell();
lbl = new Label();
lbl.Text = "Choose one"
tc.Controls.Add(lbl);
tr.Cells.Add(tc);

tc = new TableCell();
ddl = new DropDownList();
ddl.Items.Add("Choose", "-1"));
ddl.Items.Add("First", "1");
ddl.Items.Add("Second", "2");
ddl.ID = "ddlContentType";

tc.Controls.Add(ddl);
tr.Cells.Add(tc);

tbl.Rows.Add(tr);

StringBuilder sb = new StringBuilder();
StringWriter tw = new StringWriter(sb);
HtmlTextWriter hw = new HtmlTextWriter(tw);

tbl.RenderControl(hw);
string renderedValue = sb.ToString();
hw.Close();

return HttpUtility.JavaScriptStringEncode(renderedValue, true);

我不明白为什么在具有相同过程的同一页面上完全相同的结构有效，但这个却不行？

提前致谢。

Answer 1

正如@gaurav 在 jQuery AJAX Call Returns null Response Time to Time 中提到的那样某些浏览器无法正确处理空数据。我按如下方式处理空数据:

function RunAjaxCall(uri, jsonData, callBack, postParams) {
        $.ajax({
            type: "POST",
            url: uri + ((uri.indexOf("?") > -1) ? "&" : "?") + "rand=" + new Date().getTime(),
            **data: jsonData != null ? JSON.stringify(jsonData) : {},**
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            cache: "false",
            success: function (msg) {
                Success(msg, callBack, postParams);
            },
            error: function (msg) {
                Error(msg);
            }
        });
    },