How to implement cross-page multi-selection using checkbox in Java

Recently I want to implement a function, which is checkbox cross-page multi-selection. I looked online and found that there is very little information and most of it is incomplete. But after my efforts, I finally made it.

JSP page:

1. Define three Hidden variables:

<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;  
             }  
           } 
         }  
       }  
     } 
    }

The getCheckBoxInformation() method is called every time the page is turned, and the initPage() method is called when the page is loaded.

In the background, the method is called every time the page is turned

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;
  }

Pass the all_select returned by this method to the JSP page and assign it to the hidden field. At this point, the function is realized.

The above is the method introduced by the editor to implement cross-page multi-selection in checkbox in Java. I hope it will be helpful to you. If you have any questions, please leave me a message and the editor will reply to you in time. of. I would also like to thank you all for your support of the PHP Chinese website!

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