I am trying to bind a list to drop down in JSP. Below is my controller and JSP.
Controller:
#Controller
public class WeatherServiceController {
#Value("#{'${countryList}'.split(',')}")
private List<String> countries;
#ModelAttribute("CountriesList")
private List<String> getCountries(){
System.out.println(countries.size());
return countries;
}
#RequestMapping(value = "/getweather", method=RequestMethod.GET)
public ModelAndView getWeather(){
Place p = new Place();
ModelAndView mav = new ModelAndView();
mav.addObject("place",p);
mav.setViewName("home");
return mav;
}
}
JSP:
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%# taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Weather Service Client - Home</title>
</head>
<body>
<h2>Welcome to Weather Service</h2>
<form:form modelAttribute="place" action="getWeather">
<table>
<tr>
<td><form:label path="country">Country:</form:label></td>
<td>
<form:select path="country" items="${CountriesList}">
</form:select>
</td>
</tr>
</table>
</form:form>
</body>
</html>
But I am getting error like "Type [java.lang.String] is not valid for option items". Country list is not coming in jsp page. Please help me what I did wrong here.
It is working now.
I have added below line in jsp page.
<%# page isELIgnored="false" %>
I thought by default "isELIgnored" is set to false, so I haven't included earlier. After including this page is binding list result.
Related
i am creating a quiz application where i want to group options in a radio button list after fetching options from database. My code is below so that one option from optionList of Question object is selected seprately.
i want to list group of questions and their options in a single page options with their relative questions .if i select option of one question i should be able to select another option of another question. how do i seprate radio buttons for each questions???
#Controller
public class ApiController {
#Autowired
private QuestionRepository qr;
#Autowired
private OptionRepository or;
#Autowired
private ActivitiesCrudRepository acr;
#RequestMapping("/questions")
public String ShowQuestions(#ModelAttribute("questions") Question question) {
return "questions";
}
#RequestMapping("/save")
public String save(#ModelAttribute("questions") Question question) {
qr.save(question);
return "questions";
}
#RequestMapping("/pq")
public String playQuiz(Model m, #ModelAttribute("questions") Question qsn) {
Iterable<Question> q = qr.findAll();
System.out.println(q);
m.addAttribute("q", q);
return "play-quiz";
}
<%# page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%# taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<%# taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%# page isELIgnored="false"%>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<form:form action="play" modelAttribute="questions">
<c:forEach var="temp" items="${q}">
${temp.qsn_Name}<br>
<c:forEach var="temp1" items="${temp.options}">
<form:radiobuttons path="options[0].name" value="${temp1.name}"
items="${????????????}" />
<br>
</c:forEach>
<br>
</c:forEach>
<input type="submit" value="submit">
</form:form>
</body>
</html>
When using using the taglib function form:radiobuttons you don't need to iterate over the options you want in the radiobutton group.
You can replace
<c:forEach var="temp1" items="${temp.options}">
<form:radiobuttons path="options[0].name" value="${temp1.name}"
items="${????????????}" />
<br>
</c:forEach>
with
<form:radiobuttons path="options[0].name" items="${temp.options}" />
Be aware of the difference between form:radiobutton which create one single button and form:radiobuttons which creates the whole group.
See f.x. https://www.tutorialspoint.com/springmvc/springmvc_radiobuttons.htm or https://mkyong.com/spring-mvc/spring-mvc-radiobutton-and-radiobuttons-example/for more examples.
I just started to learn jsp and spring. I deleted formattedDate (as a default) in HomeController.java and changed to model.addAttribute("answer", "yes") and on web, it only shows . and i don't understand why.
I tried to put definition like String answer = "yes" but it didnt work.
this is HoneController.java:
#Controller
public class HomeController {
#RequestMapping("/main")
public String home(Locale locale, Model model) {
model.addAttribute("answer", "yes");
return "home";
}
}
and here is home.jsp:
<%# taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%# page session="false" pageEncoding="UTF-8" %>
<html>
<head>
<title>Home Page</title>
</head>
<body>
<h1>
hello
</h1>
<P> Is it happening? : ${answer}. </P>
</body>
</html>
There was no error messages
My get ParameterValues method is not working, i am trying to retrieve the values from JSP page to MVC controller below is the code snipet for MVC page
#RequestMapping(value="/searchQuery", method=RequestMethod.POST)
public ModelAndView submitForm(HttpServletRequest request, ModelAndView model) {
System.out.println("Called submitfform method");
String[] listBox1 = request.getParameterValues("selectedright");
String[] listBox2 = request.getParameterValues("selectedright2");
String to_date=request.getParameter("date1");
String from_date=request.getParameter("date2");
System.out.println(listBox1);
System.out.println(listBox2);
List<ItemMaster> lists=itemDao.fetchRecords(listBox1,listBox2,to_date,from_date);
model.addObject("queryResult",lists);
model.setViewName("results");
System.out.println(lists.size());
// m.addAttribute("message", "Successfully Requested person: " + adhoc.toString());
return model;
}
Below is the snipet of JSP page from where I am trying to retrieve whole JSP page is to big to paste over here.
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%#taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%# taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>ADHOC Report</title>
<link rel="stylesheet"
href="//code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.css">
<script src="//code.jquery.com/jquery-1.10.2.js"></script>
<script src="//code.jquery.com/ui/1.11.4/jquery-ui.js"></script>
<link rel="stylesheet" href="/resources/demos/style.css">
<script>
<! -- My Functions >
</script>
</head>
<BODY id="body" bgcolor="#f5f5f5" onload="preventBack();">
<!-- <onpageshow="if(event.persisted) preventBack();"> -->
<form:form action="searchQuery" method="post">
<table width="100%" height="30%" border="1" align="center"
cellpadding="4" style="text-align: center; background-color: white">
</table>
<br>
I am facing an issue with the flash attributes which I have not able to retrieve it in the GET phase of POST/redirect/GET scenario. This is only happening when I use the ResourceBundleViewResolver.
view resolver
<bean class="org.springframework.web.servlet.view.ResourceBundleViewResolver">
<property name="basename" value="spring-views" /> </bean>
view properties
form.(class)=org.springframework.web.servlet.view.JstlView
form.url=/WEB-INF/pages/form.jsp
home.(class)=org.springframework.web.servlet.view.JstlView
home.url=/WEB-INF/pages/home.jsp
home_redirect.(class)=org.springframework.web.servlet.view.RedirectView
home_redirect.url=home
form.jsp
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form action="register" method="post">
Name: <input type="text" name="name"/> <br/>
<input type="submit" value="Submit"/>
</form>
</body>
</html>
home.jsp
<%# taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<html>
<body>
<h2> ${status} </h2>
</body>
</html>
so in this page, home.jsp, the status should contain the value set as the flash attribute.
controller
#Controller
public class WebController {
#RequestMapping(value="/form", method=RequestMethod.GET)
public String showFormPage(){
return "form";
}
#RequestMapping(value="/register", method=RequestMethod.POST)
public ModelAndView login(#RequestParam("name") String name, RedirectAttributes flashMap){
System.out.println("name = " + name);
flashMap.addFlashAttribute("status", "Registered successfully");
//return new RedirectView("home"); -- with this returned its working
return new ModelAndView("home_redirect"); //-- with this returned its not working
//return "redirect:home"; // -- not working
}
#RequestMapping(value="/home")
public String showHomePage(){
return "home";
}
}
on the whole this is the observation made:
if used resource bundle view resolver
return view names as string - not working
return ModelAndView - not working
return RedirectAndView - working
if used internal view resolver
return view names as string - working
2 return modelandview - cannot be used to redirect
return RedirectAndView - working
I searched for this problem and as I got it has some problems with naming conflicts, but again I could not find the reason. I would appreciate the helps. following is the line in the .jsp which calls the controller:
<td>
<a href="message/createMessage">
Reply
</a>
<input type="hidden" name="receiver" value="${message.fromUser}">
</td>
${message.fromUser} gets the required property from the model. I am sure it is not the reason for the problem because of other link in this page which works and uses the same model. The controller is as follow:
#Controller
#RequestMapping("/message")
public class MessageController
{
#RequestMapping("createMessage")
public String createMessage(
#RequestParam("receiver") String receiver,
HttpSession session,
Model model)
{
try
{
MessageDAO mDao = new MessageDAO();
Message message = new Message();
String fromUser = (String) session.getAttribute("userName");
message.setFromUser(fromUser);
message.setUserName(receiver);
Message message2 = mDao.create(message);
model.addAttribute(message);
return "newMessage";
}
catch (Exception e)
{
model.addAttribute("message", "Can't create message!");
return "redirect:/"; // ?? should add a dialog box for error
}
}
}
Thank you for your help!
as an attempt to solve the problem and based on the first answer I tried to use url-rewriting. used #PathVariable("receiver") in my controller. still the same problem. I have added the full revised jsp here: error happens when I click reply link for a message.
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%# taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%# taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h1>welcome ${sessionScope.user.userName}</h1>
<form:form method="POST" action="message/deleteMessage">
<table border="1">
<tr>
<th>Message ID</th>
<th>From User</th>
<th>Message</th>
<th>Date</th>
<th>Reply to User</th>
<th>Delete</th>
</tr>
<c:forEach items="${messages}" var="message" >
<tr>
<td>${message.messageID}</td>
<td>${message.fromUser}</td>
<td>${message.message}</td>
<td>${message.messageDate}</td>
<td>Reply</td>
<td><input type="checkbox" name="delete" value="${message.messageID}"> </td>
</tr>
</c:forEach>
<tr><td colspan="6"><input type="submit" value="Delete selected messages"></td></tr>
</table>
</form:form>
In your "form" you have a plain html hyperlink that doesn't do any form submit(so the value of the hidden field is never being sent.
So you need to declare a <FORM action= 'message/createMessage' > element.
Then you need to either submit the form with AJAX or create a submit button. Another way is to pass receiver value manually by appending the value of the form createMessage?receiver=someValue(I added this as example I don't think it's a recommended way, everything has its pros n' cons anyway).
So there are many ways to pass the parameter.
See http://www.w3.org/TR/html401/interact/forms.html