Question

我正在通过Jquery Ready函数进行一些Ajax调用。在后端处理之后，我在Session中设置了很少的变量。当回到我的相同JSP页面时，我试图打印那些变量但是当页面第一次加载时，这些变量将变为空。如果我重新加载页面，我能够看到变量的值。我不确定我哪里错了。

Ajax调用JSP

jQuery(document).ready(function() {

    var myToy = 'B';

    var url="/myBuysAjaxCall.ac?&myToy="+myToy;

    if(window.XMLHttpRequest) {
        AJAX = new XMLHttpRequest();
    } else if(window.ActiveXObject) {
        if(ms_xmlhttp) {
            AJAX = new ActiveXObject(ms_xmlhttp);
        } else {
            var versions=["Msxml2.XMLHTTP.7.0", "Msxml2.XMLHTTP.6.0", "Msxml2.XMLHTTP.5.0", "Msxml2.XMLHTTP.4.0", "Msxml2.XMLHTTP.3.0", "MSXML2.XMLHTTP", "Microsoft.XMLHTTP"];
            for(var i=0; i<versions.length; i++) {
                try {
                    AJAX = new ActiveXObject(versions[i]);
                    if(AJAX) {
                        ms_xmlhttp = versions[i];
                    }
                } catch(e) {
                    //do nothing. go to next version and try it.
                }
            }
        }
    }

    AJAX.onreadystatechange = processMyToy;

    AJAX.open("GET", url, true);
    console.log("Ajax call made..");
    AJAX.send(null);

 });

function processMyToy() {
    if (AJAX.readyState == 4) { // Complete
        if (AJAX.status == 200) { // OK response

            var returnedValue = AJAX.responseText; 
            console.log("Something came in Response ");

            var obj1FromSession= '<c:out value="${obj1FromSession}"/>';
            var obj2FromSession= '<c:out value="${obj2FromSession}"/>';
            var obj3FromSession= '<c:out value="${obj3FromSession}"/>';

            console.log(obj1FromSession);
            console.log(obj2FromSession);
            console.log(obj3FromSession);

        }
    }

});

后端代码

public void loadandProcessMyToy() throws Exception{

    Context contextObj = ContextHelper.getContext();
    String myToy = (String) contextObj.getObjectFromRequest("myToy");

    If Condition{

        String obj1FromSession="Hello 1";
        String obj2FromSession="Hello 2";
        String obj3FromSession="Hello 3";

        ContextHelper.getContext().setObjectInSession("obj1FromSession",obj1FromSession);
        ContextHelper.getContext().setObjectInSession("obj2FromSession",obj2FromSession);
        ContextHelper.getContext().setObjectInSession("obj3FromSession",obj3FromSession);

    }

}

注意： - 当第一次加载页面时，它在Ajax响应部分中显示为空。在页面重新加载（通过F5）时，按预期打印Hello1，Hello2 ..

我想在第一次加载时看到值。请帮忙。

第一次加载页面时，Ajax Call and Response无效

0 个答案: