Calling Javascript function inside JSP scriplet

Question

I have a javascript function that needs to be called under a condition.

The condition is given below

<%if(request.getAttribute("isValidUser").equals("false"))
  {%>
     Redirect();
<%}%>

Redirect() is the function name that I have declared and defined in the section.

When I execute the page I am getting the following error.

    org.apache.jasper.JasperException: An exception occurred 
    processing JSP page /HomePage.jsp at line 136

HomePage.jsp:

133:      <p><input type="password" name="password" id="password" placeholder="Password"/></p>
134:      <span id="nullPassword" class="error"></span>
135:   </div><span style="color:red;">
136:   <%if(request.getAttribute("isValidUser").equals("false"))
137:   {%>
138:        Redirect();
139:   <%}%>

Please help me out.

Thank you.

Answer 1

我没有足够的重复点来评论，但看起来你的js函数调用应该在脚本标签中。

Answer 2

getAttribute returns an object and you may need to typecast.

On another note:

Javascript and JSP are two different things. JSPs will undergo a compilation process just like your Java files. Only if the compilation is successful, the JSP can be "reached".

Javascript on the other hand will execute on the browser.

Answer 3

Put the javascript function call within tags

 <%

 if(request.getAttribute("isValidUser").equals("false"))

 { 

 %>

   <script>Redirect();</script>

 <%

 }

%>