JSTL忽略了条件

Question

- 这个问题现在已经解决了。我忘了添加JSTL库 -

我有一个使用jquery-toastmessage-plugin的基于网络的应用程序。我正在使用JSTL捕获URL参数并通过Toast消息显示它们。以下是我在index.jsp的相关代码。

<!--show messages-->
<script type="text/javascript" src="js/jquery.toastmessage.js"></script>
<link type="text/css" href="css/jquery.toastmessage.css" rel="stylesheet"/>  

<script type="text/javascript">

    function showSuccessToast() {
        $().toastmessage('showSuccessToast', "${resultMessage}");
    }
    function showStickySuccessToast() {
        $().toastmessage('showToast', {
            text     : 'Success Dialog which is sticky',
            sticky   : true,
            position : 'top-right',
            type     : 'success',
            closeText: '',
            close    : function () {
                console.log("toast is closed ...");
            }
        });

    }
    function showNoticeToast() {
        $().toastmessage('showNoticeToast', "Notice  Dialog which is fading away ...");
    }
    function showStickyNoticeToast() {
        $().toastmessage('showToast', {
             text     : 'Your Trial is expired. Please apply for an paid account.',
             sticky   : true,
             position : 'top-right',
             type     : 'notice',
             closeText: '',
             close    : function () {console.log("toast is closed ...");}
        });
    }
    function showWarningToast() {
        $().toastmessage('showWarningToast', "Warning Dialog which is fading away ...");
    }
    function showStickyWarningToast() {
        $().toastmessage('showToast', {
            text     : 'Warning Dialog which is sticky',
            sticky   : true,
            position : 'top-right',
            type     : 'warning',
            closeText: '',
            close    : function () {
                console.log("toast is closed ...");
            }
        });
    }
    function showErrorToast() {
        $().toastmessage('showErrorToast', "${resultMessage}");
    }
    function showStickyErrorToast() {
        $().toastmessage('showToast', {
            text     : 'Error Dialog which is sticky',
            sticky   : true,
            position : 'top-right',
            type     : 'error',
            closeText: '',
            close    : function () {
                console.log("toast is closed ...");
            }
        });
    }

</script>

<!--/show messages-->

<!--error message display-->
 <c:if test="${param.isTrial!=null}">


    <c:if test="${not param.isTrial}">
        <script>
            window.onload = function() {
              showStickyNoticeToast();
               };
         </script>

     </c:if>

  </c:if> 

以下是我从URL传递参数的方法。

response.sendRedirect("index.jsp?isTrial=true");

现在我的问题是，isTrial param是真还是假，无论是否为空都无关紧要，toastmessage总是会显示出来。我在这做错了什么？