在jsp页面中重新运行测试而无需重新加载页面

Question

Is it possible to rerun a <c:choose> block of code as shown bellow without reloading the JSP page?

<c:choose>
    <c:when test="${salary <= 0}">
       Salary is very low to survive.
    </c:when>
    <c:when test="${salary > 1000}">
        Salary is very good.
    </c:when>
    <c:otherwise>
        No comment sir...
    </c:otherwise>
</c:choose>

This would need to be done in the case that the value of salary changed and a different resut needs to be shown.

Answer 1

You cannot rerun the c:choose block without reloading the JSP. The JSP is processed on the server side and then sent to the client. The client only gets the rendered result of the c:choose , not the JSP itself.

When you use JavaScript to update the value, then either repeat the logic in the JavaScript based on the value of salary or request the label via an XMLHttpRequest.