Express req.body返回undefined

Question

我有一个包含动态数量输入字段的表单，因此我需要为每个表单创建一个唯一的ID。当我发布其他输入（没有唯一ID的那些输入）时，它们的值会恢复正常。但所有具有唯一ID的输入都未定义。知道为什么会这样吗？

以下是相关的server.js代码：

app.get('/creategroup', (request, response) => {
    var members = [];
    var memberCount = 5;
    for(var i = 1; i <= memberCount; i++){
        name_id = randomString(32, '#aA');
        phone_id = randomString(32, '#aA');
        var member = { 
          id: i,
          name: '',
          name_id: name_id,
          phone: '',
          phone_id: phone_id
        }
        members[i-1] = member;
      }
      app.locals.memberCount = members.length;
      app.locals.members = members;
      console.log("members: "+app.locals.memberCount+" : "+app.locals.members);
    response.render('creategroup', {
      memberCount: memberCount,
      members: members
    })
})
app.post('/creategroup', function(req, res) {
  res.header("Content-Type", "application/json");
  var group_name = req.body.group_name;
  var date = req.body.date;
  var price = req.body.price;
  var members = app.locals.members;
  var memberCount = app.locals.memberCount;
  console.log("count: "+memberCount);
  for (var i = 1; i <= members.length; i++) {
    member = members[i-1];
    name_id = member["name_id"];
    phone_id = member["phone_id"];
    console.log("name: "+name_id);
    console.log("phone: "+phone_id);
    console.log("Member "+i+": "+req.body.name_id+" : "+req.body.phone_id);
  }
})

以下是这些输入字段的相关html：

<div class="inputWrapper">
        <h2 class="title">Add group members</h2>
        {{#each members}}
        <div class="personWrapper">
            <div class="personItem">
                <label for={{id}}>Name</label>
                <input class="nameInput" id={{id}} name={{name_id}} type="text" placeholder="Name">
            </div>
            <div class="personItem">
                <label for={{id}}>Phone Number</label>
                <input id={{id}} type="text" name={{phone_id}} placeholder="Phone number">
            </div>
        </div>
        {{/each}}
        <p id="addMembers" class="addPeople">Add more people</p>
    </div>