Java checkbox实现跨页多选

最近要实现一个功能，就是checkbox跨页多选，在网上看了一下，资料很少，而且大多是不完全的。不过经过我的努力，终于做出来了。
    JSP页面:
   1,定义三个Hidden变量:

     <INPUT type="hidden" name="all_selected"> 
     <INPUT type="hidden" name="now_selected"> 
     <INPUT type="hidden" name="no_selected">  

    2,javascript
 

  // 获取checkbox信息,选中,未选中,当前选中 
         function getCheckBoxInformation() { 
           var checkboxes = document.getElementsByName("checkbox"); 
           var checkedStr = ""; 
           var uncheckedStr = ""; 
           var url = ""; 
           for(var i = 0; i < checkboxes.length; i++) { 
               var checkbox = checkboxes[i]; 
               if(checkbox.checked) { 
                  checkedStr = checkedStr + "," + checkbox.value; 
              }else { 
                  uncheckedStr = uncheckedStr + "," + checkbox.value; 
              } 
          } 
          document.form1.now_selected.value = checkedStr; 
          document.form1.no_selected.value = uncheckedStr; 
       } 


   // 页面onload的时候计算当前页被选中项,并在页面表示 
        function initPage() { 
            var all_selected = document.form1.all_selected.value; 
            if(all_selected != "" && all_selected!= null) { 
                var arrall_select = all_selected.split(","); 
                if(arrall_select.length > 0) { 
                    for(var k = 0; k < arrall_select.length; k++) { 
                          for(var i = 0; i < document.form1.checkbox.length; i++) { 
                               if(document.form1.checkbox[i].value == arrall_select[k]) { 
                                document.form1.checkbox[i].checked = true;   
                            }   
                        } 
                    }   
                }   
            } 
         } 

   
   每次翻页的时候调用getCheckBoxInformation()方法,页面加载的时候调用initPage()方法.


在后台，每次翻页时调用方法

public String doubleSpread(String all_select, String now_selected, String no_selected) {
		//获取当前选中的项目加入al
		List al = new ArrayList();
		if(all_select != "" && all_select != null)
		{
			String[] all_select_str = all_select.split(",");
			for(int a=0;a<all_select_str.length;a++)
			{
				al.add(all_select_str[a]);
			}
		}
		
		//将当前选中项目加入列表
		if (now_selected != "" && now_selected != null) {
			String[] all_now_select = now_selected.split(",");
			for (int i = 1; i < all_now_select.length; i++) {
				if (!al.contains(all_now_select[i])) {
					al.add(all_now_select[i]);
				}
			}
		}
		
		//将当前未选中项目从列表中删除
		if (no_selected != "" && no_selected != null) {
			String[] all_now_no_select = no_selected.split(",");
			for (int i = 1; i < all_now_no_select.length; i++) {
				if (al.contains(all_now_no_select[i])) {
					al.remove(all_now_no_select[i]);
				}
			}
		}
		
		all_select=al.toString().replaceAll(" +","");;
		all_select=all_select.substring(1,all_select.length()-1)+",";
		
		return all_select;
	}

将此方法返回的all_select再传到JSP页面上并赋值给那个隐藏域,到此，功能就实现了。

评论

1 楼 wangxiang243 2012-08-30  

不错 ，学习了