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I'm having a problem with JSON and XHR.

send data to server with FROM SUBMIT
CODE:
var sUrl = "<%= request.getContextPath() %>/master/jsonKsmst400.do?command=excel";
var jsonAllRecord = YAHOO.lang.JSON.stringify(liveDataList);
var formObject = document.getElementById('aform');
var ohide = document.getElementById('hideData');
ohide.value = jsonAllRecord;
formObject.action = sUrl;
formObject.submit();
use this way , server can get whole data. the data's count is 164160. and it works!!

send data to server with XHR
CODE:
var jsonAllRecord = YAHOO.lang.JSON.stringify(liveDataList);
var postData = "excelData=" + jsonAllRecord;
var sUrl = "<%= request.getContextPath() %>/master/jsonKsmst400.do?command=excel";
var request = YAHOO.util.Connect.asyncRequest('POST', sUrl, callback, postData);
use this way , server get part of data. the data's count is 84130. and it has error!!
erroe msg is :
net.sf.json.JSONException: Unterminated string at character 84970 of

How can i do ?

Hi,Peter Foti,thanks for your help!!