java - 如何将页面上下文附加到 JSP 中不在 DOM 标记中的 URL 字符串

Question

我正在使用页面上下文来引用 Tomcat Web 服务器上的某些资源。例如，我用它来获取图像，如下所示:

<img src="${pageContext.request.contextPath}/images/ajax-loader.gif" id="loading">

当我尝试对只是字符串的 src 执行相同的操作，而不是像上面那样位于文档标记内时，我收到错误。如何向纯字符串添加上下文？或者这是不允许的。

//This does not work and gives me syntax errors

if(response.validation === "success")
        window.location.href=${pageContext.request.contextPath}+"dashboard.jsp";
    else{
        $("#notification").append("<td><center>You have entered an incorrect username or password</center></td>");
    }
    });

//This works but I don't want to do it this way
  if(response.validation === "success")
        window.location.href="http://69.164.xx.xx:8080/MySite/dashboard.jsp";
    else{
        $("#notification").append("<td><center>You have entered an incorrect username or password</center></td>");
    }
  });

//Edit: Rendered Page after using first option

if(response.validation === "success")
        window.location.href=/RiverBoat+"dashboard.jsp";
    else{
        $("#notification").append("<td><center>You have entered an incorrect username or password</center></td>");
    }
  });

Answer 1

你的 JSP

window.location.href=${pageContext.request.contextPath}+"dashboard.jsp";

渲染到

window.location.href=/RiverBoat+"dashboard.jsp";

这是无效的 javascript，并且您会收到语法错误。

您希望将其渲染为

window.location.href="/RiverBoat"+"dashboard.jsp"; // or rather `"/RiverBoat" + "/dashb..."

所以只需添加引号

window.location.href="${pageContext.request.contextPath}"+"dashboard.jsp";

如上面代码注释中所述，您可能需要 "/dashboard.jsp"。