Question

js中怎么样获取从form提交后返回的json数据

Answer 1

function exitsCheck(str) {
  if(jsonXmlHttpSupport) {
    var sUrl = 'Action.action?str='+encodeURIComponent(str);
       var jsonRequest = new XMLHttpRequest();
       jsonRequest.onreadystatechange = function() {
           if(jsonRequest.readyState == 4) {                    
               var jsonResult = eval('(' + jsonRequest.responseText + ')');
                if (jsonResult.jsonMsg != 0) {
                 alert("xxxxx");   
                     return;
        }
            	document.forms[0].action = "<%=request.getContextPath()%>/xxxxxAction";
            	document.forms[0].submit();	
               }
            };
       jsonRequest.open('POST', sUrl);
       jsonRequest.send(null);
    }
  }