jstl

问题 or say get class name or get type name so that can work on major popular web container/servers? Thank you. 回答1: ${foo.class.name} returns the fully qualidied name of foo . But instanceof being already something you should rarely use in a well-design OO program, it should be used even less in the JSP EL, where methods are called dynamically without caring of the actual type, and where the end goal should only be to generate markup. 来源： https://stackoverflow.com/questions/11348378/how-to

问题 I don't know if it's just me, but <fmt:formatNumber var="roundedNumber" value="2.5" type="number" pattern="#" /> gives me <%-- ${roundedNumber} == 2 --%> Do you know why formatNumber doesn't round this to 3? UPDATE It seems that if the number is ODD is rounded correctly, but if it's even number it's not. 2.5 will be rounded 2 2.51 will be rounded 3 3.5 will be rounded 4 3.51 will be rounded 4 4.5 will be rounded 4 4.51 will be rounded 5 ... etc 回答1: I thought the cause might be the

问题 I have this code that actually works: <s:iterator value="breadcrumb.links" var="link"> <s:url action='%{#link.url}' var="url" /> <li> <a href="${url}">${link.name}</a> </li> </s:iterator> How con I do the same thing but with c:foreach instead of s:iterator ? I tried with: <c:forEach items="${breadcrumb.links}" var="link"> <s:url action='${link.url}' var="url" /> <li> <a href="${url}">${link.name}</a> </li> </c:forEach> but I get the error: According to TLD or attribute directive in tag file,

问题 I want to create a dynamic table accepting book attributes when it has provided the no. of books to be entered on the previous page. But I am not getting anything. This is my code: <table> <c:forEach begin="1" end= "${ no }" step="1" varStatus="loopCounter"> <tr> <td> <input type='text' name="isbn" placeholder="ISBN"> </td> <td> <input type="text" name="Title" placeholder="Title"> </td> <td> <input type="text" name="Authors" placeholder="Author"> </td> <td> <input type="text" name="Version"

问题 I am considering using Facelets and JSTL in the same web project. Are there any issues in integrating these ? 回答1: Facelets has cloned a limited set of "good old" JSTL tags and included in the Facelets library. They are all described here. In other words: not all JSTL tags/functions are supported in Facelets. If there's any original JSTL tag which you would like to use, but isn't made available by Facelets, then you'll head in another corner for the solution. The jobs which can be done by the

问题 i'm helping develop a java jsp jstl based web service and all dynamic objects are being inserted using ${object.foo} and i was wondering if it made a difference whether or not it was actually in <c:out value="${object.foo} /> ? the pages all load correctly, but i wonder if there is something that i'm not seeing that may be an issue. 回答1: when you use JSTL core out tag, you have some more options: The values that you are passing to the tag will be by default XML-escaped You can provide a

问题 I have a resource file that will have some optional keys. If the optional resource key is not present, I set a default instead. It appears that there is no easy way to determine if a key exists in the resource bundle. So this is what I'm doing to get around it. <fmt:message var="title" key="login.reg.signup.${signupForm.regfrom}.title" /> <c:if test='${fn:startsWith(title, "??")}'> <fmt:message var="title" key="login.reg.signup.default.title" /> </c:if> Is there a better way? 回答1: You could

问题 Hey How to use loop in tag in jsp page? i want to use JSTL data to pass in data tables my code is like : $(document).ready(function() { /* Init DataTables */ var startString = "["; var mainString = ""; var endString = "]"; var temp = ${k.size()}; <c:forEach items="${k}" var="stdn" varStatus="status"> temp--; if (temp === 0) { mainString = mainString + "{key:\"" + "${stdn.key}" + "\",name:\"" + "${stdn.value.name}" + "\",rollno:\"" + "${stdn.value.rollNo}" + "\",marks:\"" + "${stdn.value.marks

问题 i have populate some values using c:forEach tag. I want to get those values in my javascript. If I click GetCtag value button, then i want to read from ( c:forEach ) values in javascript. Is any other-way to retrieve the c:forEach tag value <%@page contentType="text/html" pageEncoding="UTF-8"%> <%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %> <%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %> <%@ taglib uri="http://richfaces.org/a4j" prefix="a4j"%> <%@taglib prefix="c" uri

问题 I'm a beginner in Java EE technologies. I wonder what the difference is between the jstl-api jar and the jstl-impl jar. Why are the API and implementation separated? Does it mean there are other implementations available? 回答1: The API and implementation are separated, because Java EE works with a standardized specification. The API is part of that specification, and contains a set of mostly interfaces to which everybody that participated in creating said specification agreed. In theory