maven - Showing (or not) a DIV or other HTML tag with JSTL if a variable exist -


i'm teaching myself how work jstl.

i'm having problems showing/not showing div on view when variable set o not controller.

i'm working on spring boot maven project tiles template management.

i set variable fine in controller , can see in jsp view, , in case show in div, follows:

<c:if test="${!empty loggeduser}">     <div class="alert alert-success alert-dismissible" role="alert">         <button type="button" class="close" data-dismiss="alert"             aria-label="close">             <span aria-hidden="true">&times;</span>         </button>         <strong>${loggeduser.email}</strong> welcome new project!     </div> </c:if>

i expect code if loggeduser variable set, print whole div tag "email welcome" alert, next image: jstl working fine

by other hand, if loggeduser variable not set, or not exist, div not showed @ all. got when loggeduser doesn't exist div showing without user email in alert. next image: jstl not working expected

what need if set variable in controller, show complete div. if variable not set or doesn't exist, don't show/print div.

p.s: controller's method.

@postmapping("/login/entry") public string checkuserinfo(@valid loginuser loginuser, bindingresult bind, model model) {     logger.info("entry");     if (bind.haserrors()) {         logger.info("bind has errors");         model.addattribute("hidetemplates", true);         return "loginpage";     }     model.addattribute("loggeduser", loginuser);     return "aboutpage"; }

i'm working tiles templates management. problem here jsp line <%@ taglib prefix='c' uri='http://java.sun.com/jsp/jstl/core' %> not included in cascade.

i solved problem including jsp line on every view file had use jstl el.


Comments

Post a Comment

Popular posts from this blog

How to understand 2 main() functions after using uftrace to profile the C++ program? -

i trying uftrace profile following simple c++ program: #include <iostream> class { public: a() {std::cout << "a created" << std::endl;} ~a() {std::cout << "a destroyed" << std::endl;} }; int main() { a; return 0; } the profile result this: # uftrace a.out created destroyed # duration tid function 2.026 [ 4828] | __cxa_atexit(); [ 4828] | main() { [ 4828] | __static_initialization_and_destruction_0() { 89.397 [ 4828] | std::ios_base::init::init(); 0.768 [ 4828] | __cxa_atexit(); 93.029 [ 4828] | } /* __static_initialization_and_destruction_0 */ 94.425 [ 4828] | } /* main */ [ 4828] | main() { [ 4828] | a::a() { 11.104 [ 4828] | std::operator <<(); 10.825 [ 4828] | std::basic_ostream::operator <<(); 24.514 [ 4828] | } /* a::a */ [ 4828] | a::~a() { 0.978 [ 4828] | ...
Read more

c# - Update a combobox from a presenter (MVP) -

i using mvp in project, new in mvp. have 2 comboboxes. when select option in combobox, combobox should filled new data. this action in presenter. view 'view1' in presenter, , introduced combobox1 , combobox2 properties in 'view1', because need 'datasource', 'displaymember', 'valuemember' , 'refresh()' in method below. but, when using pattern, enough send property like public string combobox2 { { return combobox1.selectedvalue.tosstring(); } } into presenter not whole combobox. how can solve problem? public void onselectedindexchangedcombobox1() { if (view1.combobox1.selectedindex == -1) { return; } datatable dt = tools.getdatatable("a path"); var query = (from o in dt.asenumerable() o.field<string>("afield") == farmerview.combobox1.selectedvalue.tostring() orderby o.field<string>("anotherfield") select...
Read more

How to put a lock and transaction on table using spring 4 or above using jdbcTemplate and annotations like @Transactional? -

i trying put lock on table while writing on table , if happened in between roll-back . trying convert below code lock table test_g1 read; lock table test_g write; -- begin; start transaction; insert test_g1 values(143); insert test_g values(145); select * test_g1; select * test_g; rollback; select * test_g; unlock tables; how convert above code @transactional spring jdbctemplate code? @transactional(rollbackfor={dataaccessexception.class}) public void test(){ jdbctemplate.execute("insert test1 (id, nam) values (4, 'a')"); throw new dataaccessexception("error") { }; } here trying throw error, insert statement should rollback it's not happening . thanks edit-1 attaching code , doing in jdbcdaoimpl.java , mentioned problem comment above test() . app.java package com.cgiri.javabrains.spring4; import org.springframework.beans.factory.annotation.autowired; import org.springframework.context.applic...
Read more