el

问题 When we can access all the implicit variables in JSP, why do we have pageContext ? My assumption is the following: if we use EL expressions or JSTL, to access or set the attributes we need pageContext . Let me know whether I am right. 回答1: You need it to access non -implicit variables. Does it now make sense? Update : Sometimes would just like to access the getter methods of HttpServletRequest and HttpSession directly. In standard JSP, both are only available by ${pageContext} . Here are some

问题 how to add el code and jstl code to the textbox generated dyanmically like ${fn:escapeXml(param.foo)} as value of textbox. 回答1: That's not possible. Webbrowser doesn't understand JSTL and EL code. It only understands HTML/CSS/JS code. This JSTL/EL code has to run in the webserver. Your best bet is to let JavaScript send an Ajax request to the server which in turn runs some JSP with JSTL/EL code and then returns the generated HTML response and finally let JavaScript display that HTML. If your

问题 how to add el code and jstl code to the textbox generated dyanmically like ${fn:escapeXml(param.foo)} as value of textbox. 回答1: That's not possible. Webbrowser doesn't understand JSTL and EL code. It only understands HTML/CSS/JS code. This JSTL/EL code has to run in the webserver. Your best bet is to let JavaScript send an Ajax request to the server which in turn runs some JSP with JSTL/EL code and then returns the generated HTML response and finally let JavaScript display that HTML. If your

问题 I'm attempting to append the html within el from instances var Article1 = Backbone.View.extend({ initialize: function(options) { console.log('type 1', options) this.flyIn(options); }, flyIn: function(options) { this.$el.find('.superDog').css({ display: 'block' }); this.$el.find('.superDog').animate({ top: options.top, left: options.left }, 3000); }, render: function() { }, el: '<div><p class="superDog"></p></div>' }); var Article1A = new Article1({ color: 'black', top: '300', left: '300',

问题 I'm trying to do something really simple. I just want to display a list on a JSP page from in a Spring MVC application. I've googled plenty and there are lots of examples (including some on Stackoverflow), but it's just not working for me. I'm using Maven and Spring 3.2.4. These are my files: Item.java public class Item { private final String value; public Item(String value) { this.value = value; } public String getValue() { return value; } } MainController.java @Controller public class

问题 Recently we fixed the struts2's 'S2-045' problem.I updated all the struts2 related jar files including freemarker , ognl , xWork ,etc. I use tomcat8 to deploy my dynamic web project. There were not any Exceptions while starting the tomcat-server. But some problems seemed occur: some values(got from db) should be displayed on the jsp pages dose not show up any more . There is no Exceptions thrown. I also can watch that I have already got the very Objects correctly in the Action Classes . the

问题 I'm building a web-application using JSF/Primefaces. I need to have a "constants"-class, i.e. a class that will consist of constants. These constants are mainly navigational commands that will be used throughout the application. The reason I am doing this is to avoid having instantiated Strings on an ad-hoc basis. How do I achieve this, making the constants accessible from both backing beans and XHTML files? I have tried using @ApplicationScoped and using the Singleton-pattern (Singleton

问题 I have run into a weird situation. I have an application which was originally developed in RAD and uses a construct like rendered="#{bean.show and user.can('foo')}" Our developers use mix of RAD and Eclipse Juno / Kepler. So we need to make the code work in both the environments. In RAD, the above line does not generate any errors. When I export the project as archive and import it into Eclipse Juno, it generates this error Cannot apply expression operators to method bindings Our environment

问题 I've been doing this the whole time in my JSP code: <c:out value="${myVar}"/> Today I just realized for the first time that I seem to be able to use this shorter version just as well: ${myVar} It works without <c:out> ! Perhaps this is because my page is declared like this: <%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8" isELIgnored="false" %> So, my question is, can I replace <c:out> in my code with this shorter version? Is there any reason to keep using

问题 My system: Ubuntu 9.10. Eclipse 3.5.1 with Java EE 1.2.1 (manual install - NOT from synaptic). Web Developer Tools 3.1.1 I've recently adopted someone else's code (a Dynamic Web Project), and run into lots of errors, warnings and incorrect syntax highlighting in Eclipse. I've narrowed it down to these 4 lines of code (create a new Dynamic Web Project, and then a new JSP page, and put this in the body): ${(1<2)? "" : "no"} <%for (int i = 0; i < 5; i++) {%> <div>${5}</div> <%}%> Errors /