AngularJs:ng-model 未绑定到 ng-checked 输入类型 =“radio"，与 ng-repeat 一起使用

你有一些语法错误，缺少模型值和一些不必要的标记.首先，您可以完全摆脱 ng-checked.如果您正确设置了 ng-model 和 ng-value，这将自动处理.由于您的对象是独一无二的，因此不需要 track by.

当使用 AngularJS 指令(例如 ng-value)时，你不需要使用大括号来引用你的模型值.所以 ng-value="{{person}}" 变成了 ng-value="person".

您引用了 myObj.person，但似乎没有对应的模型值.下面是您提供的代码和标记的编辑，表明使用对象作为单选按钮的值确实有效.

angular.module('app', []).controller('MyCtrl', ($scope) => {$scope.people = [{名称:约翰"，编号:J"}, {名称:保罗"，编号:P"}, {名称:乔治"，编号:G"}, {名称:林戈"，编号:R"}];$scope.myObj = {人:$scope.people[1]};});

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.7.2/angular.min.js"></脚本><div ng-app="app" ng-controller="MyCtrl"><表格名称="myForm"><p>决定</p><ul><li ng-repeat="人中人"><标签>{{ 人名 }}{{ myObj.person }}</div></div>

I am trying to use ng-repeat directive with track by expression, to show radio buttons, when I submit the value gets attached in the model and when I reopens the page using the values in model, the radio button does not show checked.

I have implemented same with plane string model + string values . But this time am trying with objects.

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.5/angular.min.js"></script>
<div ng-app="app" ng-controller="MyCtrl">
    <form name="myForm">
        <p>New TRY</p>
        <ul>
            <li ng-repeat="i in peopleNew.person">
                <label>
            {{i}}
                    <input type="radio" ng-model="peopleServer.person"
                           name="same" ng-value="i" />
                </label>  
            </li>
        </ul>
    </form>
<div>

JS code

 angular.module('app', [])
  .controller('MyCtrl', ($scope) => {
  $scope.peopleNew ={
   person: {
      "name": "Ringo",
      "id": "R",
     "subj": "Sci"
    } 
  }
   $scope.peopleServer= {
   person: {"name":"Ringo"}
   }
  });

As per above, I should have 4 radio buttons on the screen, I am able to select 1 and submit. And then when I again open it in my model the person have the right value which was saved thorough ng-value but still on UI i don't see the radio button as checked for name Ringo should be checked. Model have:

 $scope.peopleServer= {
    person: {name:"Ringo"}
   }

Tried Solutions

1. ng-checked expression , although I read that ng-model and ng-checked should not be used together, ideally using model binding it should be chcked.
2. explanationI read about ,ng-repeat is not rendering properly so i tried to re render forcefully but did not work.
3. Removed ng-checked from the template still did not work.
4. Track by works for string values in ng-repeat.In ng-options it worked for object values also, but then its not input element but a select element

Someone help understand, when you reload or you already have the value in model,how the radio button be selected

	angular.module('app', [])
  .controller('MyCtrl', ($scope) => {
  $scope.peopleNew ={
   person: {
      "name": "Ringo",
      "id": "R",
     "subj": "Sci"
    } 
  }
  //uncomment for testing. 
   $scope.peopleServer= {
   person: {"name":"Ringo"}
   }
  });

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.5/angular.min.js"></script>
<div ng-app="app" ng-controller="MyCtrl">
	<form name="myForm">
		<p>New TRY</p>
		<ul>
			<li ng-repeat="i in peopleNew.person">
				<label>
            {{i}}
                    <input type="radio" ng-model="peopleServer.person"
                           name="same" ng-value="i" />
				</label>  
			</li>
		</ul>
    </form>
<div>

automatically ? all my tries above are not working am i missing something.

You have some syntax errors, missing model values and some unnecessary markup. First, you can get rid of the ng-checked altogether. That will be handled automatically if you set your ng-model and ng-value properly. Since your objects are unique there's no need for track by.

When using AngularJS directives (such as ng-value) you do not need to use braces to reference your model values. So ng-value="{{person}}" becomes ng-value="person".

You refer to myObj.person, but there doesn't appear to be a corresponding model value. Below is an edit of the code and markup you have provided showing that it really does work to use an object as the value for your radio buttons.

angular.module('app', [])
  .controller('MyCtrl', ($scope) => {
    $scope.people = [{
      name: "John",
      id: "J"
    }, {
      name: "Paul",
      id: "P"
    }, {
      name: "George",
      id: "G"
    }, {
      name: "Ringo",
      id: "R"
    }];
    $scope.myObj = {
      person: $scope.people[1]
    };
  });

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.7.2/angular.min.js"></script>
<div ng-app="app" ng-controller="MyCtrl">
  <form name="myForm">
    <p>Decisions</p>
    <ul>
      <li ng-repeat="person in people">
        <label>
            {{ person.name }}
            <input type="radio" ng-model="myObj.person"
                   name="sameName" ng-value="person" />
        </label>
      </li>
    </ul>
  </form>
  <div>
    {{ myObj.person }}
  </div>
</div>