User management--implementing secondary linkage using jquery's ajax
Page effect
Implementation steps
1.Introducing struts integrated json plug-in package
2.Page usage jquery's ajax calls the second-level linkage js
//ajax的二级联动,使用选择的所属单位,查询该所属单位下对应的单位名称列表function findJctUnit(o){//货物所属单位的文本内容var jct = $(o).find("option:selected").text();$.post("elecUserAction_findJctUnit.do",{"jctID":jct},function(data,textStatus){ //先删除单位名称的下拉菜单,但是请选择要留下 $("#jctUnitID option").remove();if(data!=null && data.length>0){for(var i=0;i<data.length>"); $option.attr("value",ddlCode); $option.text(ddlName); $("#jctUnitID").append($option); } } }); }</data.length>
3. Define the findJctUnit() method in the Action class. Here, the returned List collection is placed on the top of the stack, and struts2 converts it Into json data
/** * @Name: findJctUnit * @Description: 使用jquery的ajax完成二级联动,使用所属单位,关联单位名称 * @Parameters: 无 * @Return: 使用struts2的json插件包*/public String findJctUnit(){//1:获取所属单位下的数据项的值(从页面提交的jctID值,不是数据字典中的ddlcode)String jctID = elecUser.getJctID();//2:使用该值作为数据类型,查询对应数据字典的值,返回List<elecsystemddl>List<elecsystemddl> list = elecSystemDDLService.findSystemDDLListByKeyword(jctID);//3:将List<elecsystemddl>转换成json的数组,将List集合放置到栈顶 ValueUtils.pushValueStack(list);return "findJctUnit"; }</elecsystemddl></elecsystemddl></elecsystemddl>
<span style="font-size: 14px"> 其中,findSystemDDLListByKeyword(jctID)是在数据字典service中实现的方法,主要根据数据类型名称查询数据字典,返回list集合对象<br><br> ValueUtils是一个工具类,pushValueStack方法将list压入到struts2值栈的栈顶</span>
public class ValueUtils {public static void pushValueStack(Object object) { ServletActionContext.getContext().getValueStack().push(object); } }
The struts2 plug-in package will push all the attributes of the object in the list collection of the struts2 value stack to json Change
4. Define
in struts.xml(1)Modify extends value
Before modification
<!-- 系统管理 --><package></package>
After modification
<!-- 系统管理 --><package></package>
(2)Add mapping
<!-- 如果是List集合,转换成json数组;如果是object对象,转换成json对象 --><result></result>
After completing the above steps, you can select the drop-down box of the unit you belong to. The value has the corresponding value in the unit name drop-down option.
View the json data on the browser page as follows:
If you want to target a certain attribute by json At this time, you can modify the struts.xml file :
<!-- 如果是List集合,转换成json数组;如果是object对象,转换成json对象 --><result><param>\[\d+\]\.ddlCode,\[\d+\]\.ddlName</result>
Here, use regular expressions to intercept one or more ddlCode and ddlName, so that only the json data contains Contains ddlCode and ddlName.
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