Update tag inside ng-if in angularjs

问题

I would like to update the list of states on selection of country. I have researched a bit into this where it was recommended to use $parent as ng-if does not work on controller scope.But that too is not working for me.

Can someone please help me understand how to get the values into state select control.

Also I would also like to know what if there are multiple ng-if in my HTML. (again nested $parent.$parent.$parent... is not working)

Plunker Link : Plunker Link

"use strict";

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

function CountriesController($scope) {
  $scope.condition = true;
    $scope.countries = [{
        "name": "USA",
        "id": 1
      },{
        "name": "Canada",
        "id": 2
    }];
    
    $scope.states = [{
        "name": "Alabama",
        "id": 1,
        "countryId": 1
      }, {
        "name": "Alaska",
        "id": 2,
        "countryId": 1
      }, {
        "name": "Arizona",
        "id": 3,
        "countryId": 1
      }, {
        "name": "Alberta",
        "id": 4,
        "countryId": 2
      }, {
        "name": "British columbia",
        "id": 5,
        "countryId": 2
    }];
    
    $scope.updateCountry = function(){
      $scope.availableStates = [];
      
      angular.forEach($scope.states, function(value){
        if(value.countryId == $scope.country.id){
          $scope.availableStates.push(value);
        }
      });
    }
}

<!DOCTYPE html>
<html data-ng-app="app">

<head>
  <script data-require="angular.js@1.1.5" data-semver="1.1.5" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.1.5/angular.js"></script>
  <link rel="stylesheet" href="style.css" />
  <script src="script.js"></script>
</head>

<body data-ng-controller="CountriesController">
  <div ng-if="condition">
    <select data-ng-model="country" data-ng-options="country.name for country in countries" data-ng-change="updateCountry()">
      <option value="">Select country</option>
    </select>
    <br>
    <select data-ng-model="state" data-ng-options="state.name for state in availableStates">
      <option value="">Select state</option>
    </select>
    <br> Country: {{country}}
    <br> State: {{state}}
  </div>
</body>

</html>

回答1:

Instead of making a separate list, you can use your country list by filtering

 filter: {countryId: $parent.country.id}

"use strict";

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

function CountriesController($scope) {
  $scope.condition = true;
    $scope.countries = [{
        "name": "USA",
        "id": 1
      },{
        "name": "Canada",
        "id": 2
    }];
    
    $scope.states = [{
        "name": "Alabama",
        "id": 1,
        "countryId": 1
      }, {
        "name": "Alaska",
        "id": 2,
        "countryId": 1
      }, {
        "name": "Arizona",
        "id": 3,
        "countryId": 1
      }, {
        "name": "Alberta",
        "id": 4,
        "countryId": 2
      }, {
        "name": "British columbia",
        "id": 5,
        "countryId": 2
    }];
    
    $scope.updateCountry = function(){
      $scope.availableStates = [];
      
      angular.forEach($scope.states, function(value){
        if(value.countryId == $scope.country.id){
          $scope.availableStates.push(value);
        }
      });
    }
}

<!DOCTYPE html>
<html data-ng-app="app">

<head>
  <script data-require="angular.js@1.1.5" data-semver="1.1.5" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.1.5/angular.js"></script>
  <link rel="stylesheet" href="style.css" />
  <script src="script.js"></script>
</head>

<body data-ng-controller="CountriesController">
  <div ng-if="condition">
    <select data-ng-model="country" data-ng-options="country.name for country in countries" data-ng-change="">
      <option value="">Select country</option>
    </select>
    <br>
    <select data-ng-model="state" data-ng-options="state.name for state in states | filter:{countryId: country.id}:true">
      <option value="">Select state</option>
    </select>
    <br> Country: {{country}}
    <br> State: {{state}}
  </div>
</body>

</html>

回答2:

Here is simplest way to init selected option:

for blank form, just init with option value that you want (don't forget the double single quotes)

<select ng-model="$ctrl.data.userlevel" ng-init="$ctrl.data.userlevel='0'">
<option value="0">User</option>
<option value="1">Admin</option>
</select>

for loaded data form, just init using that loaded model data, like below:

<select ng-model="$ctrl.data.userlevel" ng-init="$ctrl.data.userlevel=''+$ctrl.data.userlevel">
<option value="0">User</option>
<option value="1">Admin</option>
</select>

i think, init value should be string. so they need to concat with double single quotes.

来源：https://stackoverflow.com/questions/32839186/update-select-tag-inside-ng-if-in-angularjs

标签

angularjs

angular-ng-if

Update <select> tag inside ng-if in angularjs

问题

回答1:

回答2: