Question

我有一个JSON Collection

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

请参考我的帖子Copy JSON Object of One Select to another Select ng-model using AngularJS

我在这里使用 Angular Material md-select 代替HTML Select

在 md-select 中，ng-options无效。所以，请帮助我如何更新第一个md-select的选择值到第二个md-select

完整的HTML源代码

＆＃13;

<!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>

＆＃13;

我有两个Angular Materials md-Select和相同的JSON Collection。我在第一个md-select＆＃34; Person＆＃34;中选择了一个人Watson，然后我需要在第二个md-select＆＃34; Copy Person＆＃34;中更新Same。但我无法更新。

我将JSON对象绑定为md-select选项中的值，而不是Id或Name

请帮助我如何更新md-select？

Answer 1

不幸的是，md-select不支持ng-options ...

并且ng-repeat不能与选择组件的ng-model绑定。

Answer 2

不是分配对象而只是分配原始值。

目前您正在使用此方法：

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

只需将逻辑更改为

$scope.selected.copy_person = newData;

完整版

<!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，Value部分将JSON对象指定为字符串，具体取决于帖子Bind JSON Object as a Value in AngularJS HTML Select - Dropdown。因此，只需将值作为String而不是JSON Object进行比较。

使用AngularJS

2 个答案: