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javascript - ng-模型列表未在 Angular js 中更新

转载 作者：行者123 更新时间：2023-12-03 05:22:00 27 4
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我正在开发网络应用程序，用户在选择第一个下拉列表后选择第一个下拉列表，第二个下拉列表加载数据，其数据取决于第一个下拉选择。如果第二个下拉列表有一个项目，则 ng-model 会更新，但如果第二个下拉列表有多个项目，则 ng-model 未更新总是显示 ng-model 中的最后一项。

我正在附上一个 Jsbin link 

<body ng-app="starter">

<div ng-controller="MyCtrl">
 <div> Map Type<select ng-model="Map.TypeSel" ng-options="item as item.Name for item in Map.Types track by item.Id" ng-init="Map.TypeSel=Map.Types[0]"></select></div>
 <div>Commodity<select ng-model="Map.MapSel" ng-options="item as item.Metal for item in Map.Cord[Map.TypeSel.Code] track by item.Dim" ng-init="Map.MapSel=Map.Cord[Map.TypeSel.Code][0]" ng-change="loadMap()"></div>
</div>

<script>
var app=angular.module('starter', []);

app.controller('MyCtrl', function ($scope) {
    $scope.Map = [];
    $scope.Map.Cord = [];

    $scope.Map.Types = [{ Name: "Geology", Id: 0, Code: "Geo" }, { Name: "Metallic", Id: 1, Code: "Met" }, { Name: "Non Metallic", Id: 2, Code: "Non" }, { Name: "Rare Earth", Id: 3, Code: "Ear" }, { Name: "Metallic & Non Metallic", Id: 4, Code: "MNe" }];
    $scope.Map.Cord.Geo = [{ "Metal": "Geology Of Oman", "Dim": "2481,3509", "Path": "img/M/GEOLOGY_OF_OMAN.jpg" }];
    $scope.Map.Cord.Met = [{ "Metal": "CHROMITE", "Dim": "2481,3509", "Path": "img/M/Metallic/CHROMITE(M).jpg" }, { "Metal": "COPPER", "Dim": "2481,3509","Path":"img/M/Metallic/COPPER(M).jpg" }, { "Metal": "GOLD", "Dim": "2481,3509","Path":"img/M/Metallic/GOLD(M).jpg" }, { "Metal": "IRON", "Dim": "2481,3509","Path":"img/M/Metallic/IRON(M).jpg" }];
    $scope.Map.Cord.Non = [{ "Metal": "ASBESTOS", "Dim": "2481,3509", "Path": "img/M/NON_Metallic/ASBESTOS(NM).jpg" }, { "Metal": "BARITE", "Dim": "2481,3509", "Path": "img/M/NON_Metallic/BARITE(NM).jpg" }, { "Metal": "CLAY", "Dim": "2481,3509", "Path": "img/M/NON_Metallic/CLAY(NM).jpg" }, { "Metal": "GYPSUM", "Dim": "2481,3509", "Path": "img/M/NON_Metallic/GYPSUM(NM).jpg" }, { "Metal": "KAOLIN", "Dim": "2481,3509", "Path": "img/M/NON_Metallic/KAOLIN(NM).jpg" }, { "Metal": "LATERITE", "Dim": "2481,3509", "Path": "img/M/NON_Metallic/LATERITE(NM).jpg" }, { "Metal": "LEAD", "Dim": "2481,3509", "Path": "img/M/NON_Metallic/LEAD(NM).jpg" }, { "Metal": "LIMESTONE", "Dim": "2481,3509", "Path": "img/M/NON_Metallic/LIMESTONE(NM).jpg" }, { "Metal": "ORNAMENTAL STONE", "Dim": "2481,3509", "Path": "img/M/NON_Metallic/ORNAMENTAL_STONE(NM).jpg" }, { "Metal": "PHOSPHATE", "Dim": "2481,3509", "Path": "img/M/NON_Metallic/PHOSPHATE(NM).jpg" }, { "Metal": "PYRITE", "Dim": "2481,3509", "Path": "img/M/NON_Metallic/PYRITE(NM).jpg" }, { "Metal": "SILICA", "Dim": "2481,3509", "Path": "img/M/NON_Metallic/SILICA(NM).jpg" }];
    $scope.Map.Cord.Ear = [{ "Metal": "STRONTIUM", "Dim": "2481,3509", "Path": "img/M/RARE_Earth/STRONTIUM(RE).jpg" }, { "Metal": "URANIUM", "Dim": "2481,3509", "Path": "img/M/RARE_Earth/URANIUM(RE).jpg" }];
    $scope.Map.Cord.MNe = [{ "Metal": "Metalic & Non Metalic", "Dim": "2481,3509", "Path": "img/M/M&NM.jpg" }];

    $scope.loadMap = function () {        
            console.log($scope.Map.MapSel);

    }

});
</script>

请指导我的代码有什么问题。

最佳答案

如何在第一个下拉列表的 ng-change 上加载默认值

  $scope.loadDefaultValue = function() {
    $scope.Map.TypeSel = $scope.Map.Types[0];
    $scope.Map.MapSel = $scope.Map.Cord[$scope.Map.TypeSel.Code][0];
  }

  $scope.loadSecondDefault = function(typeSel) {
    $scope.Map.MapSel = $scope.Map.Cord[typeSel.Code][0];
  }

var app = angular.module('starter', []);

app.controller('MyCtrl', function($scope) {
  $scope.Map = [];
  $scope.Map.Cord = [];

  $scope.Map.Types = [{
    Name: "Geology",
    Id: 0,
    Code: "Geo"
  }, {
    Name: "Metallic",
    Id: 1,
    Code: "Met"
  }, {
    Name: "Non Metallic",
    Id: 2,
    Code: "Non"
  }, {
    Name: "Rare Earth",
    Id: 3,
    Code: "Ear"
  }, {
    Name: "Metallic & Non Metallic",
    Id: 4,
    Code: "MNe"
  }];
  $scope.Map.Cord.Geo = [{
    "Metal": "Geology Of Oman",
    "Dim": "2481,3509",
    "Path": "img/M/GEOLOGY_OF_OMAN.jpg"
  }];
  $scope.Map.Cord.Met = [{
    "Metal": "CHROMITE",
    "Dim": "2481,3509",
    "Path": "img/M/Metallic/CHROMITE(M).jpg"
  }, {
    "Metal": "COPPER",
    "Dim": "2481,3509",
    "Path": "img/M/Metallic/COPPER(M).jpg"
  }, {
    "Metal": "GOLD",
    "Dim": "2481,3509",
    "Path": "img/M/Metallic/GOLD(M).jpg"
  }, {
    "Metal": "IRON",
    "Dim": "2481,3509",
    "Path": "img/M/Metallic/IRON(M).jpg"
  }];
  $scope.Map.Cord.Non = [{
    "Metal": "ASBESTOS",
    "Dim": "2481,3509",
    "Path": "img/M/NON_Metallic/ASBESTOS(NM).jpg"
  }, {
    "Metal": "BARITE",
    "Dim": "2481,3509",
    "Path": "img/M/NON_Metallic/BARITE(NM).jpg"
  }, {
    "Metal": "CLAY",
    "Dim": "2481,3509",
    "Path": "img/M/NON_Metallic/CLAY(NM).jpg"
  }, {
    "Metal": "GYPSUM",
    "Dim": "2481,3509",
    "Path": "img/M/NON_Metallic/GYPSUM(NM).jpg"
  }, {
    "Metal": "KAOLIN",
    "Dim": "2481,3509",
    "Path": "img/M/NON_Metallic/KAOLIN(NM).jpg"
  }, {
    "Metal": "LATERITE",
    "Dim": "2481,3509",
    "Path": "img/M/NON_Metallic/LATERITE(NM).jpg"
  }, {
    "Metal": "LEAD",
    "Dim": "2481,3509",
    "Path": "img/M/NON_Metallic/LEAD(NM).jpg"
  }, {
    "Metal": "LIMESTONE",
    "Dim": "2481,3509",
    "Path": "img/M/NON_Metallic/LIMESTONE(NM).jpg"
  }, {
    "Metal": "ORNAMENTAL STONE",
    "Dim": "2481,3509",
    "Path": "img/M/NON_Metallic/ORNAMENTAL_STONE(NM).jpg"
  }, {
    "Metal": "PHOSPHATE",
    "Dim": "2481,3509",
    "Path": "img/M/NON_Metallic/PHOSPHATE(NM).jpg"
  }, {
    "Metal": "PYRITE",
    "Dim": "2481,3509",
    "Path": "img/M/NON_Metallic/PYRITE(NM).jpg"
  }, {
    "Metal": "SILICA",
    "Dim": "2481,3509",
    "Path": "img/M/NON_Metallic/SILICA(NM).jpg"
  }];
  $scope.Map.Cord.Ear = [{
    "Metal": "STRONTIUM",
    "Dim": "2481,3509",
    "Path": "img/M/RARE_Earth/STRONTIUM(RE).jpg"
  }, {
    "Metal": "URANIUM",
    "Dim": "2481,3509",
    "Path": "img/M/RARE_Earth/URANIUM(RE).jpg"
  }];
  $scope.Map.Cord.MNe = [{
    "Metal": "Metalic & Non Metalic",
    "Dim": "2481,3509",
    "Path": "img/M/M&NM.jpg"
  }];

  $scope.loadMap = function() {
    console.log($scope.Map.MapSel);
  }

  $scope.loadDefaultValue = function() {
    $scope.Map.TypeSel = $scope.Map.Types[0];
    $scope.Map.MapSel = $scope.Map.Cord[$scope.Map.TypeSel.Code][0];
  }

  $scope.loadSecondDefault = function(typeSel) {
    $scope.Map.MapSel = $scope.Map.Cord[typeSel.Code][0];
  }

});
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="starter" ng-controller="MyCtrl">
    <div>
    <label>TYPE:{{Map.TypeSel}}</label>
    <br>
    <label>MAP:{{Map.MapSel}}</label>
  </div>
  <div>Map Type
    <select ng-model="Map.TypeSel" ng-options="item as item.Name for item in Map.Types track by item.Id" ng-init="loadDefaultValue()" ng-change="loadSecondDefault(Map.TypeSel)"></select>
  </div>
  <div>Commodity
    <select ng-model="Map.MapSel" ng-options="item as item.Metal for item in Map.Cord[Map.TypeSel.Code]" ng-change="loadMap()">
  </div>
</div>

注意:您必须通过 Dim 删除轨道，因为它没有唯一值

关于javascript - ng-模型列表未在 Angular js 中更新，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/41340253/

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