How to loop through Java List<Object[]> object in JavaScript?

Question

Controller

List<Object[]> permissionList = new ArrayList();
 //fill  permissionList with list of object ayyays (objetct[0] = permission id, object[1] = permission)
 model.addAttribute("permissionList", permissionList);

jsp

var allpermissionList = "${permissionList}";

$.each(allpermissionList, function (index, av) {
   var id = av[0];
   vat name=av[1];
   //set values to div element
});

i can't loop through my list with js $each()... av[0] and av[1] cannot cannot obtain.

Read the generated source and you will see what the problem is. You need to use JSON. — SLaks
– SLaks, Commented Dec 10, 2013 at 15:58
@adeneo The to part is Java (OP says JSP), the bottom part is JavaScript. — p.s.w.g
– p.s.w.g, Commented Dec 10, 2013 at 15:58
controller is java spring controller problem is with loop through my list in jsp page. — Dinesh J
– Dinesh J, Commented Dec 10, 2013 at 15:58
I have never used JSP, but just a guess: what if you remove the quotes around the variable, e.g. var allpermissionList = ${permissionList}? — p.s.w.g
– p.s.w.g, Commented Dec 10, 2013 at 16:00

Christophe L · Accepted Answer · 2013-12-10 16:15:26Z

4

Java code runs on the server. JavaScript runs on the client. They are very different languages and do not interoperate out of the box. When you need to pass data from Java to JavaScript, the easiest is to serialize it to JSON using Jackson for example.

import com.fasterxml.jackson.databind.ObjectMapper;

ObjectMapper om = new ObjectMapper();
model.addAttribute("permissionList", om.writeValueAsString(permissionList));

and in the JSP:

var allpermissionList = ${permissionList};

Note that not all Java object are serializable to JSON so the objects in your list should be simple Java types (String, Number...) or POJOs.

answered Dec 10, 2013 at 16:15

Christophe L

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Comments

tk_ · Accepted Answer · 2018-11-01 03:18:18Z

2

I got resolved .. thanks all.

Controller

List<Object[]> permissionList = new ArrayList();
// load values
List<Map<String, String>> listAll = new ArrayList<>();
   if (permissionList != null && permissionList.size() > 0) {
       for (Object[] objects : allPermissions) {
           Map map = new HashMap();
           map.put("id",objects[0]);
           map.put("permName", objects[1]);
           listAll.add(map);
        }
    }

ObjectMapper mapper = new ObjectMapper();
String permissionList = mapper.writeValueAsString(listAll);
model.addAttribute("permissionList", permissionList);

Jsp

 var allpermissionList = eval(${permissionList});
  $.each(allpermissionList, function (index, permission) {
     var id = permission.id;
     var name = permission.name;

 });

edited Nov 1, 2018 at 3:18

tk_

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answered Dec 10, 2013 at 16:51

Dinesh J

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