I'm having a problem with displaying a string in jsp view. A a web framework I'm using Spring MVC.
The view (return.jsp) is like that:
<%# page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%# taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>FredomWings</title>
</head>
<body>
<b>Result -></b>
<p>${currentValue}</p>
</body>
</html>
The controller looks like that:
#RequestMapping(value="balance")
public String getBalance(Model model) {
model.addAttribute("currentValue","alalal");
return "return";
}
What is the reason for which in the jsp page only Result -> without any value is displayed?
I cannot found the way to convert java code to jstl
This is my java code
for(int i=0;i<listCategory.size();i+=3){
int size = i+3<listCategory.size() ? i+3 : listCategory.size
for(int j=i;j<size;j++){
Category cate = lisCategory.get(j);
}
}
Please help me :(
Hi I’m not sure if I understand what you want, but ill try to help you if I can, The JavaServer Pages Standard Tag Library (JSTL) is a collection of useful JSP tags which encapsulates core functionality common to many JSP applications. Below is the tag for the core libary.
<%# taglib prefix="c"
uri="http://java.sun.com/jsp/jstl/core" %>
If you want to emulate your for loop from Java you would use the <c:forEach> Tag. This will allow you to iterate over a list in your JSP page assuming you include the taglib provided above. Here is an example for you to view.
<%# taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html>
<head>
<title><c:forEach> Tag Example</title>
</head>
<body>
<c:forEach var="i" begin="1" end="5">
Item <c:out value="${i}"/><p>
</c:forEach>
</body>
</html>
I hope this gives you some insight or helps you along your journey.
When a file is selected it must set the fileName with path to a textField with path="inputFileName". I tried to below code which is not working as setFileName is not called either onClick nor onSelect.
Any pointers how this can be done will be great help to me.
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%#taglib uri="http://www.springframework.org/tags/form" prefix="f" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%!
public void setFileName(){
System.out.println("In SetFile Name for InputFile");
}
%>
<html>
<body>
File Convertor
<PRE>
<f:form method="PUT" commandName="file2" >
Input File <f:input path="inputFileName"/><input type="file" name="ChooseMyFile" value="A" onclick="setFileName()" onselect="setFileName()"/>
Output File <f:input path="outputFileName"/>
</f:form>
</PRE>
</body>
</html>
I am trying to create a form. Where the user need to select a file path.
This can be done in html as
<input type="file" name="inputFileName"/>
If we use html then I don't know how to map that value to "fileObject" class.
So how should I do this with the following code throwing a warning "Undefined attribute name type "
<%# page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%#taglib uri="http://www.springframework.org/tags/form" prefix="f" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<body>
<f:form method="PUT" commandName="fileObject" >
<f:input type="file" path="inputFileName"/>
</f:form>
</body>
</html>
Exception:
org.apache.jasper.JasperException: /WEB-INF/jsp/Main.jsp(9,0) Attribute type invalid for tag input according to TLD
f:input does not have attribute type as you can find it in docs
What is the best-practice for developing web-pages for both non-JS-enabled and JS-enabled pages? I am developing a Spring MVC web-application using JSP/JSTL as the view technology.
The way I work is to create a full web-page (with "html", "head", etc) tags in it. This will work on all browsers. My entire app works (however ugly-bugly) with JS disabled.
Also included in each page is some jQuery script that prettifies the page, typically turning top-level "divs" into tabs, other divs into dialogs, etc. The JS "hijacks" the underlying HTML. My JS hijacks the links and buttons, using AJAX calls to load the content into the correct dialog or tab div.
This all works nicely and I like the architecture, but I have added an optimisation such that the AJAX requests appends a "contentOnly" parameter; this is picked up by the Spring MVC view which conditionally ignores the "head", etc - i.e. it only renders the real content that the AJAX version wants. It just feels clunky.
I know I could load the entire page and discard the outer bits but this seems inefficient to load all the associated CSS and JS files which are not strictly necessary.
My question is: is there a nicer way to write this conditional formatting, should I be using a different view technology or something else, something like Velocity or FreeMarker or whatever Grails uses?
An example of my conditional: -
<%# page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%# taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%# taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<c:if test="${param.contentOnly == null}">
<!DOCTYPE html>
<html>
<head>
<%# include file="_stylesAndScripts.jsp"%>
<title>My App Title</title>
</head>
<body>
<%# include file="_header.jsp"%>
<%# include file="_menu.jsp"%>
</c:if>
<div id="leadListPanel" class="contentPanel">
<h1>My App Title</h1>
<p>The time on the server is ${serverTime}.</p>
<table id="leadTable" class="list">
... rest of content...
<c:if test="${param.contentOnly == null}">
<%# include file="_footer.jsp"%>
</body>
</html>
</c:if>
You need to include the files the other way round.
/WEB-INF/template.jsp
<!DOCTYPE html>
<html>
<head>
<%# include file="_stylesAndScripts.jsp"%>
<title>My App Title</title>
</head>
<body>
<%# include file="_header.jsp"%>
<%# include file="_menu.jsp"%>
<jsp:include page="${page}.jsp" />
<%# include file="_footer.jsp"%>
</body>
</html>
leads.jsp
<%# taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%# taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<div id="leadListPanel" class="contentPanel">
<h1>My App Title</h1>
<p>The time on the server is ${serverTime}.</p>
<table id="leadTable" class="list">
... rest of content...
And create a controller which sets leads as ${page} variable based on a specific request URL and forward to template.jsp instead. Since I don't do Spring, I can't answer in detail how to achieve it with Spring. But the following basic JSP/Servlet kickoff example should give the general idea:
#WebServlet(urlPatterns={"/pages/*"})
public class TemplateServlet extends HttpServlet {
#Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String page = request.getPathInfo();
// .. Do some other preprocessing if necessary .. and then:
request.setAttribute("page", page);
request.getRequestDispatcher("/WEB-INF/template.jsp").forward(request, response);
}
}
Invoke it as http://example.com/contextname/pages/leads to get the template displayed with leads.jsp included. Finally you should be able to invoke http://example.com/contextname/leads.jsp independently to get the sole template content.
I have used that kind of approach a few years ago with Freemarker and I don't know better way to do it.
What you could do is to create JSP-tags for those conditions so that they look nicer and hides the actual implementation. Something like this:
<t:NonAjax>
<!DOCTYPE html>
<html>
<head>
<%# include file="_stylesAndScripts.jsp"%>
<title>My App Title</title>
</head>
<body>
<%# include file="_header.jsp"%>
<%# include file="_menu.jsp"%>
</t:NonAjax>
<div id="leadListPanel" class="contentPanel">
<h1>My App Title</h1>
<p>The time on the server is ${serverTime}.</p>
<table id="leadTable" class="list">
... rest of content...
<t:NonAjax>
<%# include file="_footer.jsp"%>
</body>
</html>
</t:NonAjax>