如何在没有模型的 Facelets 中通过简单的 for 循环重复输出文本? [英] How to repeat output of text via simple for loop in Facelets without model?
问题描述
如何使用仅标准标签(ui:、h: 等)在 JSF 中重复输出某些内容?换句话说 - 如何在 JSF 中等效于下面的 PHP 代码?我立即想利用 ui:repeat
,但它需要收集 - 我只有数字.
How to repeat output of some content in JSF using only standard tags (ui:, h: etc) ? In other words - how to do equivalent to PHP code below in JSF ? I immediately wanted to take advantage of ui:repeat
, but it needs collection - I have only number.
for ($i = 0; $i < 10; $i++) {
echo "<div>content</div>";
}
推荐答案
JSF 2.3+
JSF 2.3+
If you're already on JSF 2.3+ then you can use begin
/end
attributes of <ui:repeat>
.
xmlns:ui="http://xmlns.jcp.org/jsf/facelets"
...
<ui:repeat begin="1" end="10">
<div>content</div>
</ui:repeat>
JSF 2.2-
如果您还没有使用 JSF 2.3,那么要么使用 <c:forEach>
(确实,有时不赞成将 JSTL 与 JSF 混合使用,但这应该不会对您的特定情况造成伤害,因为您似乎想要静态"创建视图;它不依赖于任何动态变量):
JSF 2.2-
If you're not on JSF 2.3 yet, then either use <c:forEach>
instead (true, mixing JSTL with JSF is sometimes frowned upon, but this should not harm in your particular case because you seem to want to create the view "statically"; it does not depend on any dynamic variables):
xmlns:c="http://java.sun.com/jsp/jstl/core"
...
<c:forEach begin="1" end="10">
<div>content</div>
</c:forEach>
或者创建一个EL函数为
创建一个虚拟数组:
Or create an EL function to create a dummy array for <ui:repeat>
:
package com.example.util;
public final class Functions {
private Functions() {
//
}
public static Object[] createArray(int size) {
return new Object[size];
}
}
在/WEB-INF/util.taglib.xml
中注册:
<?xml version="1.0" encoding="UTF-8"?>
<facelet-taglib
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facelettaglibrary_2_0.xsd"
version="2.0">
<namespace>http://example.com/util/functions</namespace>
<function>
<function-name>createArray</function-name>
<function-class>com.example.util.Functions</function-class>
<function-signature>Object[] createArray(int)</function-signature>
</function>
</facelet-taglib>
并使用如下
xmlns:util="http://example.com/util/functions"
...
<ui:repeat value="#{util:createArray(10)}">
<div>content</div>
</ui:repeat>
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