Question

主题:如何得到logic:iterate循环中的indexId

Answer 1

请各位大侠指教, <logic:iterate id="item" name="list" indexId="i"> <logic:equal name="i" value="<%= Integer.toString(list.size() - 1) %>" ><br /></logic:equal> <bean:write name="item" /> </logic:iterate> <logic:iterate id="text" name="bean" property="list" indexId="index"> <bean:write name="index" />: <bean:write name="text" /> </logic:iterate> 还有这种用法 <logic:iterate id = "name" name ="UseBean" property = "propname" indexId = "index"> <%= index %> <bean:write name ="name" property = "hoge" /> 场景：有一个JavaBeans:如下： public class LabelValueBean implements Serializable { public LabelValueBean(String label, String value) { this.label = label; this.value = value; } private String label; public String getLabel() { return this.label; } public void setLabel(String label) { this.label = label; } private String value; public String getValue() { return this.value; } public void setValue(String value) { this.value = value; } public String toString() { StringBuffer sb = new StringBuffer("LabelValueBean["); sb.append(this.label); sb.append(", "); sb.append(this.value); sb.append("]"); return (sb.toString()); }} 这是非常普通的JavaBeans, 如果ActionForm是这样： public class TestBean extends ActionForm ｛ ..... private List lvbeans = new ArrayList(); .....｝ 使用indexed属性，TestBean类如下： public class TestBean extends ActionForm ｛ ..... private List lvbeans = new ArrayList(); public TestBean(){ //初始化数值 lvbeans.add(new LabelValueBean("1", "1")); lvbeans.add(new LabelValueBean("2", "2")); lvbeans.add(new LabelValueBean("3", "3")); } public LabelValueBean getLvbeans(int index) { return (LabelValueBean)lvbeans.get(index); } public List getLvbeans() { return lvbeans; } .....｝ 注意上述两个get方法很重要，Jsp页面代码如下： <%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %><%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %><%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %><jsp:useBean id="test2" scope="page" class="test.TestBean"/><h2>Test: <logic:iterate name="test2" property="lvbeans" id="foo" indexId="ctr"> <html:text name="test2" property='<%= "lvbeans[" + ctr + "].label" %>' /> </logic:iterate></h2> 这样，运行后的输出结果是： <h2>Test: <input type="text" name="lvbeans[0].label" value="1"> <input type="text" name="lvbeans[1].label" value="2"> <input type="text" name="lvbeans[2].label" value="3"> </h2> 这样修改TestBean中的List中的LabelValueBean数值了。