无法使用冗长的jquery保存数据

Question

我有一个textareafor

<div class="inner-addon left-addon">
     Html.TextAreaFor(m => m.DataFixes, new { @class = "resizedTextbox", id = "txtDataFixes", placeholder = "Data Fixes" , style = "width : 70px,height : 70px;" })
</div>

我使用jquery使用按钮点击保存数据。当我点击保存按钮然后我可以将数据保存在文本框中，当输入的数据很小时，但是当我尝试保存冗长的数据时，它不会被保存。以下是我的jquery代码。我认为它与var对象有关。

$('#btnUpdateDataSet').click(function() {
    var note = $("#txtNote").val();
    var fileContentName = $("#txtFileContentName").val();
    var fileContentId = $("#fileContentId").val();
    var dataFixes = $("#txtDataFixes").val();

    var oldWorkitemId = $('#drpOldWorkitemId option:selected').val();

    if (fileContentName.length == 0) {
        var fileContentId = null;
    } else {
        var fileContentId = $("#fileContentId").val();
    }
    updateDataSet(workItemID, dataSetDateStamp, cycle, reference, feed, source, target, lineStart, extension, note, fileContentId, dataFixes, oldWorkitemId);
});

以下是我的控制器

public ActionResult EditDataSet(  string dataFixes)
{
    EditDataSetVM editDataSetVM = new EditDataSetVM();

    editDataSetVM.DataFixes = dataFixes;
    return PartialView("EditDataSetView", editDataSetVM);
}

我的Ajax电话

function updateDataSet(workItemID, dataSetDateStamp, cycle, reference, feed, source, target, lineStart, extension, note, fileContentId, dataFixes,oldWorkitemId) {
    $.ajax({
        type: "POST",
        url: "/DataSet/UpDateDataSetDetails",
        contentType: "application/json; charset=utf-8",
        data: { "workItemId": workItemID, "dataSetDateStamp":

        dataSetDateStamp, "cycle": cycle, "reference": reference, "feed": feed, "source": source, "target": target, "lineStart": lineStart, "extension":

        extension, "note": note, "fileContentId": fileContentId, "dataFixes": 

        dataFixes, "oldWorkitemId": oldWorkitemId },
        datatype: "json",
        success: function (data) {
            if (data == "Update Succeeded") {
                $("#btnViewDataSet").click();
            }
            else {
                $("div.toshow").show();
                $('#lblUpdateDataSetResult').html('Following error(s) occured:<br\>' + data);
            }
        },
        error: function () {
            alert("Update WorkItem metadata failed.");
        }
    });
}