JSP自定义标签无限极(数据来源于数据库)下拉联动 JSPDWRServletJavaScriptSQL
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2024-03-15 23:57:24
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说明:这个工程的环境需要:JSP自定义标签、dwr,这个例子提供了几个实际应用的例子,包括了修改时候自动选中等。
首先看看web.xml的配置:
1、
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <servlet> <servlet-name>dwr-remote</servlet-name> <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class> <init-param> <param-name>debug</param-name> <param-value>true</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>dwr-remote</servlet-name> <url-pattern>/dwr/*</url-pattern> </servlet-mapping> <jsp-config> <taglib> <taglib-uri>/tag</taglib-uri> <taglib-location>/WEB-INF/ne.tld</taglib-location> </taglib> </jsp-config> </web-app>
2、dwr的配置文件dwr.xml
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 3.0//EN" "dwr30.dtd"> <dwr> <allow> <create creator="new" javascript="LINK"> <param name="class" value="com.core.LinkageAdapter"></param> </create> </allow> </dwr>
3、tag.xml,jsp自定义标签的配置文件
<?xml version="1.0" encoding="utf-8"?> <taglib> <tlib-version>1.0</tlib-version> <jsp-version>1.2</jsp-version> <uri>/tag</uri> <tag> <name>select</name> <body-content>empty</body-content> <info>下拉框标签</info> <tag-class>com.tag.link.SelectTag</tag-class> <attribute> <description>select框的name属性</description> <required>true</required> <rtexprvalue>true</rtexprvalue> <name>name</name> </attribute> <attribute> <description>select框的sql属性</description> <required>true</required> <rtexprvalue>true</rtexprvalue> <name>sql</name> </attribute> <attribute> <name>bind</name> <description>绑定下一级别的ID属性</description> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>bindSelectValue</name> <description>绑定联动的下拉框的值,当联动的下拉框的值为当前的值的时候选中</description> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>bindSql</name> <description>下一级别的查询SQL语句</description> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> </tag> <tag> <name>select:link</name> <body-content>empty</body-content> <info>联动的子级标签</info> <tag-class>com.tag.link.LinkSelect</tag-class> <attribute> <description>select框的name属性</description> <required>true</required> <rtexprvalue>true</rtexprvalue> <name>name</name> </attribute> <attribute> <name>bind</name> <description>绑定下一级别的ID属性</description> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>bindSql</name> <description>绑定下一级别的ID属性</description> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> <attribute> <name>bindSelectValue</name> <description>选中该下拉框的属性值</description> <required>false</required> <rtexprvalue>true</rtexprvalue> </attribute> </tag> </taglib>
4、有了上面的配置后,在jsp页面调用如下:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <%@ taglib prefix="tag" uri="/tag" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>下拉联动的测试</title> <style type="text/css"> *{ padding: 15px; } </style> <meta http-equiv="pragma" content="no-cache" /> <meta http-equiv="cache-control" content="no-cache" /> <meta http-equiv="expires" content="0" /> <script type='text/javascript' src='<%=request.getContextPath() %>/dwr/interface/LINK.js'></script> <script type='text/javascript' src='<%=request.getContextPath() %>/dwr/engine.js'></script> <script type='text/javascript' src='<%=request.getContextPath() %>/dwr/util.js'></script> </head> <body> <fieldset> <legend>省县乡级联</legend> <tag:select name="province" sql="select povinceid,povincename from povince" bind="city" bindSql="select cityid,cityname from city where father = " /> <tag:select:link name="city" bind="area" bindSql="select areaid,areaname from area where father = "/> <tag:select:link name="area" /> </fieldset> <fieldset> <legend>省县级联</legend> <tag:select name="sheng" sql="select povinceid,povincename from povince" bind="xian" bindSql="select cityid,cityname from city where father = "/> <tag:select:link name="xian" /> </fieldset> <fieldset> <legend>县乡级联</legend> <tag:select name="xianxian" sql="select cityid,cityname from city " bind="xiangxiang" bindSql="select areaid,areaname from area where father = "/> <tag:select:link name="xiangxiang" /> </fieldset> <script type="text/javascript" src="<%=request.getContextPath() %>/js/select.js"></script> </body> </html>
5、请注意查看标签调用的那部分,这个页面就实现了3组的联动,详细的就不说了,附上可以运行的工程。
详细也可以看
http://haiyangyiba.iteye.com/admin/blogs/650250
这里有详细的信息。