根据下拉列表 1 的选择填充下拉列表 2 [英] Populate Dropdown 2 based on Dropdown 1 selection

问题描述

我可以直接从数据库中填充 2 个下拉列表.我的问题是，必须根据第一个下拉选择填充第二个下拉值.由于我是 Angular 的新手，我无法弄清楚这一点，有人能帮我解决这个问题吗.

I am able to populate 2 dropdowns directly from database. My problem is, the 2nd dropdown values has to be populated based on the 1st dropdown selection. Since i am new to Angular, i m not able to figure that out, can someone help me out with this.

<select id="OfficeId" name="OfficeId" ng-model="item.OfficeId"
        ng-options="item.OfficeId as item.OfficeName for item in Offices">
    <option value="" selected>Select the Office</option>
</select>
<select id="OBJ" name="OBJ" ng-model="item.OfficeOBJId"
        ng-options="item.OfficeOBJId as item.OBJId for item in Codes">
    <option value="" selected>Select OBJ Code</option>
</select>

myApp.factory('OfficeNames', function ($resource) {
    return $resource(
        'api/Office/:id',
        { id: '@id' },
        { update: { method: 'PUT' } }
    );
});     

myApp.factory('OfficeObjCode', function ($resource) {
    return $resource(
        'api/OfficeObj/:id',
        { id: '@id' },
        { update: { method: 'PUT' } }
    );
});

function OfficeCtrl($scope, $location, OfficeNames) {
    $scope.Offices = OfficeNames.query();
}

function OfficeObjCtrl($scope, $location, OfficeObjCode) {
    $scope.Codes = OfficeObjCode.query();
}

注意:我使用的是 Web API/Angular/Petapoco/SQL Server

Note: I am using Web API/Angular/Petapoco/SQL Server

推荐答案

您不应该为此需要 2 个控制器，实际上这可能是问题之一.一旦它们在同一范围内，您就可以轻松地将它们联系在一起.在第一个选项上使用 ng-change 来触发一个函数，该函数获取填充第二个选项的值.

You shouldn't need 2 controllers for this, in fact that is probably one of the problems. Once they are within the same scope you can easily tie them together. Use ng-change on the first option to trigger a function that gets the values to populate the second option.

示例小提琴:http://jsfiddle.net/TheSharpieOne/Xku9z/

此外，您可以将 ng-show 与第二个选择的选项数组长度一起使用，以仅在填充后显示第二个选择.

Also, you can use ng-show with the second select's options array length to only show the second select when it has been populated.

示例小提琴:http://jsfiddle.net/TheSharpieOne/Xku9z/1/

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