为什么我的淘汰赛观察结果没有更新？

Question

我的 html 在页面初始化时显示“占位符”，但随后我的 ajax 调用没有更新。是否存在某种范围界定问题？

var currentPlayer = {
  "player_id": "placeholder"
};

$.ajax({
  url: "/players/summary",
  success: function(json) {
    // when this ajax call is completed the placeholder string is not replaced by
    // currentPlayer.player_id.  I have verified that the currentPlayer hash does
    // have that value after this ajax call
    currentPlayer = json;
  }
});

var dashboardViewModel = {
  // <span data-bind="text:currentPlayer"></span> displays the "placeholder"
  // string upon initialization
  currentPlayer: ko.observable(currentPlayer.player_id),
  vsPlayer: ko.observable("VS: ALL PLAYERS")
};

ko.applyBindings(dashboardViewModel);

编辑：

这就是我解决问题的方法：

var dashboardViewModel = {
  currentPlayer: ko.observable({"player_id": ""}),
  vsPlayer: ko.observable("VS: ALL PLAYERS")
};

ko.applyBindings(dashboardViewModel);

$.get("/players/summary", dashboardViewModel.currentPlayer);

Answer 1

要设置可观察值的值，您需要将新值作为第一个参数传递（与初始化它时的广告相同）。

因此，在您的回调中，您可能需要类似的内容：
DashboardViewModel.currentPlayer(json.player_id);

修改原始对象不会更新 currentPlayer 的值。