how to read data from nested json using rest services url

问题

I am using spring rest .I am getting valid json .

    {  
   "userlist":[  
      {  
         "id":2,
         "email":"waqasrana11@gmail.com",
         "password":"$2a$10$41f83FwKhR9OWNFFeBeV0u.dMIy48HsIiA6o/icgKW2nmbQyPzsby",
         "name":"waqas",
         "lastName":"kamran",
         "active":1,
         "roles":[  
            {  
               "id":2,
               "role":"user",
               "new":false
            }
         ],
         "new":false
      },
      {  
         "id":3,
         "email":"waqar11@gmail.com",
         "password":"$2a$10$pAZljuoMMXVALDpyOQtmletT0XbS2bn8ENEa7DxfgYQyFeLvpklRa",
         "name":"waqar",
         "lastName":"kamran",
         "active":1,
         "roles":[  
            {  
               "id":2,
               "role":"user",
               "new":false
            }
         ],
         "new":false
      },
      {  
         "id":4,
         "email":"waqas111@hotmail.com",
         "password":"$2a$10$fpQagNnB79JRsdFJBuMiDOw3E2F8OSopmfAGyA2RuurM63vWC/CCm",
         "name":"waqas",
         "lastName":"kamran",
         "active":1,
         "roles":[  
            {  
               "id":1,
               "role":"admin",
               "new":false
            }
         ],
         "new":false
      },
      {  
         "id":5,
         "email":"nailanaseem111@gmail.com",
         "password":"$2a$10$LXWJP2mVsD/s3xhZrmnhOerPPCTguDXBqwXwihPWIBMF0jgufuBRu",
         "name":"naila",
         "lastName":"naseem",
         "active":1,
         "roles":[  
            {  
               "id":1,
               "role":"admin",
               "new":false
            }
         ],
         "new":false
      },
      {  
         "id":6,
         "email":"zain11@gmail.com",
         "password":"$2a$10$CxYTDaJ.HUVbNCT8RGg1a.DISG2xGcQ8azV2YwOwlT6MRdPBCjgbK",
         "name":"zain",
         "lastName":"haq",
         "active":1,
         "roles":[  
            {  
               "id":2,
               "role":"user",
               "new":false
            }
         ],
         "new":false
      }
   ],
   "roleList":[  
      {  
         "id":1,
         "role":"admin",
         "new":false
      },
      {  
         "id":2,
         "role":"user",
         "new":false
      }
   ]
}

now i am trying to use jquery for each loop to show result but unable to do that . i am little bit confused about nested array .

i am using following js code. actually i am new to jquery .

<table class="data-contacts-js table table-striped" >
        <tr>
            <th>Id</th>
            <th>Name</th>
            <th>Email</th>
            <th>Role</th>

            </tr>
    </table>

    <button id="fetchContacts" class="btn btn-default" type="submit">show users</button>

    <script src="http://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
    <script type="text/javascript">

        $("#fetchContacts").bind("click", function() {

            $.get("http://localhost:8080/contacts", function(data) {

                $.each(data, function(i, contact) {

                    $(".data-contacts-js").append(
                        "<tr><td>" + contact.id + "</td>" +
                        "<td>" + contact.name+ "</td>" +
                        "<td>" + contact.email + "</td></tr>");
                });

            });
        });
    </script>

thanks for any kind of help .

note . i have edited question , how can i get role from roles array that is inside userlist array .

回答1:

You should consider userlist in each loop. Like this:

$.each(data.userlist, function(i, contact) {
       $(".data-contacts-js").append(
       "<tr><td>" + contact.id + "</td>" +
       "<td>" + contact.name+ "</td>" +
       "<td>" + contact.email + "</td></tr>");
});

回答2:

$.get() return string, you need to parse to JSON

var data = JSON.parse(data)
$.each(data.userlist, function(i, contact) {...

or using $.getJSON() to return as JSON object

$.getJSON("http://localhost:8080/contacts", function(data) {
  $.each(data.userlist, function(i, contact) {

回答3:

Try

var data = $.parseJSON(data);
var userListData = data["userlist"];

for (var i=0; i< userListData.length; i++) {
   $(".data-contacts-js").append('<tr>\
      <td>'+userListData[i].id +'</td>\
      <td>'+userListData[i].name+'</td>\
      <td>'+ userListData[i].email+'</td>\
   </tr>');
}

来源：https://stackoverflow.com/questions/45257707/how-to-read-data-from-nested-json-using-rest-services-url