Angularjs用json对象数组串级下拉

Angularjs cascade dropdown with json object array

本文关键字：数组 json 对象 Angularjs      更新时间：2023-09-26

我想了解控制器是如何在angularjs中使用级联下拉菜单的。但是我的第二个下拉框没有根据前一个下拉框的值填充。

我的JSON数组结果:

[{
    "id": "23031",
    "fabricante": "ALFA ROMEO",
    "modelo": "33",
    "motor": "1.3 '/ 1.3 ie",
    "combustivel": "Gasolina '/ GNV",
    "ano_vela": "",
    "ngk": "",
    "ngk_green": "BPR6EY",
    "gap": "0,7",
    "ano_cabo": "",
    "cabos_ngk": "",
    "inicio": "",
    "fim": "",
    "seguimento": "4 RODAS",
    "ano_bobina": "",
    "bobina_ngk": "",
    "pais": "Argentina",
    "n_processo": "0"
}, {
    "id": "23057",
    "fabricante": "ARO",
    "modelo": "Serie 10",
    "motor": "1.4",
    "combustivel": "Gasolina '/ GNV",
    "ano_vela": "",
    "ngk": "BP6HS",
    "ngk_green": "",
    "gap": "0,7",
    "ano_cabo": "",
    "cabos_ngk": "",
    "inicio": "",
    "fim": "",
    "seguimento": "4 RODAS",
    "ano_bobina": "",
    "bobina_ngk": "",
    "pais": "Argentina",
    "n_processo": "0"
}]

My Controller EDITED:

angular.module('starter.controllers', [])
.controller('fabricanteController', ['$scope','$http', function($scope, $http) {
$http.get('JSON_PATH').success(function (data) {
    $scope.fabricantes = data;
    $scope.$watch('fabricante', function(newVal) {
    if (newVal) $scope.modelo = data;
    console.log($scope.modelo);
});
});
}]);

我的HTML:

<label class="item item-input item-select">
    <div class="input-label">
        Fabricante
    </div>
    <select ng-model="fabricante" ng-options="fab.fabricante for fab in fabricantes track by fab.fabricante">
        <option value="" disabled="disabled">Selecionar</option>
    </select>
</label>
<label class="item item-input item-select">
    <div class="input-label">
        Modelo
    </div>
    <select ng-model="modelo" ng-options="mod.modelo for mod in fabricantes">
        <option value="" disabled="disabled">Selecionar</option>
    </select>
</label>

试着四处看看如何让它工作，但没有运气。知道为什么吗?

如果您想显示所选'fabricante'对象的'modelo'属性，您必须将第二个DDL的ng-option指向新的$scope数组变量，例如:

$scope.modelos = [{"modelo": newVal.modelo}];

你的ng-options应该是:

<select ng-model="test" ng-options="mod.modelo for mod in modelos">

这是一个工作的JSFiddle

你的手表没有触发，因为你传入了一个字符串，而不是一个变量。另外，我不知道你在哪里检查newVal，但它不会像那样工作。

基本实现:

$scope.$watch($scope.fabricante, function() {
    $scope.modelo = data;
    console.log($scope.modelo);
});

带newVal检查:

$scope.$watch($scope.fabricante, function() {
    if($scope.modelo!=data)
    {
      $scope.modelo = data;
      console.log($scope.modelo);
    }
});

你也可以在选择框中使用ng-change，它将在任何更改时触发。

<select ng-model="fabricante" ng-change="doSomething()" ng-options="fab.id for fab in fabricantes"></select>
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