使用 AngularJS 将一个 md-Select 的 ng-model 中的 JSON Object 复制到另一个 md-Select

Question

我有一个 JSON Collection

$scope.person = [
    {
        "Id": 1
        "Name": "John"
    },
    {
        "Id": 2
        "Name": "Jack"
    },
    {
        "Id": 3
        "Name": "Watson"
    },
];

请参考我的post

Here I'm using Angular Material md-select instead of HTML Select

在md-select中，ng-options不工作。所以，请帮助我如何将第一个 md-select 的 Select 值更新为第二个 md-select

完整的HTML源代码是

<!DOCTYPE html>
<html>
<head>
    <title>HTML Select using AngularJS</title>
    <link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/angular_material/1.0.0/angular-material.min.css">
    <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
    <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular-animate.min.js"></script>
    <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular-aria.min.js"></script>
    <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular-messages.min.js"></script>

    <!-- Angular Material Library -->
    <script src="http://ajax.googleapis.com/ajax/libs/angular_material/1.0.4/angular-material.min.js"></script>
</head>
<body>

<div ng-app="myApp" ng-controller="myCtrl"> 

    <div class="md-block">
        <md-input-container>
            <label>Person</label>
            <md-select ng-model="selected.person">
                <md-option ng-repeat="key in person | orderBy:Id" value="{{key}}">({{key.Name}})</md-option>
            </md-select>
        </md-input-container>
    </div>
    <hr />
    <div class="md-block">
        <md-input-container>
            <label>Copy Person</label>
            <md-select ng-model="selected.copy_person">
                <md-option ng-repeat="key in person | orderBy:Id" value="{{key}}">({{key.Name}})</md-option>
            </md-select>
        </md-input-container>
    </div>

</div>

<script>
    var app = angular.module('myApp', ['ngMaterial'])

    app.controller('myCtrl', function ($scope) {

        $scope.person = [
            {
                 "Id": 1,
                 "Name": "John"
            },
            {
                "Id": 2,
                "Name": "Jack"
            },
            {
                "Id": 3,
                "Name": "Watson"
            }
        ];

        $scope.selected = {
            person: null,
            copy_person:null
        };

        $scope.$watchCollection('selected.person', function (newData, oldDaata) {
            var obj = JSON.parse(newData);
            if ((obj != undefined) && (obj != null) && (obj.Id != undefined) && (obj.Id != null) && (obj.Id != "0")) {
                var name = obj.Name;
                alert(name);
                $scope.selected.copy_person = obj;
            }
        });

    });
</script>
</body>
</html>

我有两个 Angular 材料 md-Select 具有相同的 JSON Collection。我 Select 在第一个 md-select "Person" 中编辑了一个 Person Watson，然后我需要在第二个 md-select "Copy Person" 中更新 Same。但是更新不了

我将 JSON Object 绑定为 md-select 选项中的值，而不是 Id 或 Name

请帮助我如何在 md-select 中更新？

Answer 1

很遗憾 md-select 不支持 ng-options...

并且 ng-repeat 无法与 select 组件的 ng-model 绑定。

Answer 2

不是分配对象，而是分配原始值。

您目前正在使用这种方法：

$scope.selected.copy_person = JSON.Parse(newData);

只需将逻辑更改为

$scope.selected.copy_person = newData;

完整版本是

<!DOCTYPE html>
<html>
<head>
    <title>HTML Select using AngularJS</title>
    <link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/angular_material/1.0.0/angular-material.min.css">
    <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
    <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular-animate.min.js"></script>
    <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular-aria.min.js"></script>
    <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular-messages.min.js"></script>

    <!-- Angular Material Library -->
    <script src="http://ajax.googleapis.com/ajax/libs/angular_material/1.0.4/angular-material.min.js"></script>
</head>
<body>

<div ng-app="myApp" ng-controller="myCtrl"> 

    <div class="md-block">
        <md-input-container>
            <label>Person</label>
            <md-select ng-model="selected.person">
                <md-option ng-repeat="key in person | orderBy:Id" value="{{key}}">({{key.Name}})</md-option>
            </md-select>
        </md-input-container>
    </div>
    <hr />
    <div class="md-block">
        <md-input-container>
            <label>Copy Person</label>
            <md-select ng-model="selected.copy_person">
                <md-option ng-repeat="key in person | orderBy:Id" value="{{key}}">({{key.Name}})</md-option>
            </md-select>
        </md-input-container>
    </div>

</div>

<script>
    var app = angular.module('myApp', ['ngMaterial'])

    app.controller('myCtrl', function ($scope) {

        $scope.person = [
            {
                 "Id": 1,
                 "Name": "John"
            },
            {
                "Id": 2,
                "Name": "Jack"
            },
            {
                "Id": 3,
                "Name": "Watson"
            }
        ];

        $scope.selected = {
            person: null,
            copy_person:null
        };

        $scope.$watchCollection('selected.person', function (newData, oldDaata) {
            var obj = JSON.parse(newData);
            if ((obj != undefined) && (obj != null) && (obj.Id != undefined) && (obj.Id != null) && (obj.Id != "0")) {
                var name = obj.Name;
                alert(name);
                $scope.selected.copy_person = newData;
            }
        });

    });
</script>
</body>
</html>

默认情况下，值部分将 JSON 对象分配为字符串，根据您的 post 。因此，只需将值作为字符串而不是 JSON 对象进行比较。

使用 AngularJS 将一个 md-Select 的 ng-model 中的 JSON Object 复制到另一个 md-Select

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