ajax 的简单应用.

<mce:script language="JavaScript"><!-- var request = false; var flag = true; //创建XMLHttpRequst对象的一个实例 function createRequest() { if(window.XMLHttpRequest) { request = new XMLHttpRequest(); } else if(window.ActiveXObject) { request = new ActiveXObject("Msxml2.XMLHTTP"); } if (!request){ alert("Error initializing XMLHttpRequest!"); } } function getIsNotRepeat() { createRequest(); var exportDate = document.frmExportSubjectBalance.strExportSubjectBalanceDate.value; /* 修改这里 */ var url = "<%=strContext%>/FindExistSubjectBalance.jsp?exportDate=" + exportDate; request.open("GET", url, false); request.onreadystatechange = updatePage; request.send(null); } function updatePage() { if (request.readyState == 4) { if (request.status == 200) { var respText = request.responseText; /* 这里也要修改 */ /* 返回1,科目余额已存在 */ if( respText == 1 ){ if(confirm('科目余额已存在,是否重新导入？')){ flag = true; }else{ flag = false; } } } } } // --></mce:script>

控制页面有如下代码:

PrintWriter printWriter = response.getWriter(); /* 操作数据库的结果 */ printWriter.println(isExist); printWriter.flush(); printWriter.close();