Bind AngularJS data to select elements

Question

Bind AngularJS data to select elements

I am encountering an issue with data binding on a select tag, despite following the guidelines in the documentation.

Here is my select element:

<select id="start-type" ng-model="startType">
  <option value="day-of-week">Day of the week</option>
  <option value="month">Month</option>
  <option value="month-day">Day and month</option>
  <option value="year">Year</option>
  <option value="year-month">Month and year</option>
  <option value="local-time" selected>Time</option>
  <option value="local-date">Date</option>
  <option value="local-date-time">Date and time</option>
</select>
<label for="start-type">Start type</label>

The problem I am facing is that even when an item is selected, the $scope.startType model remains empty. It does not get updated.

Though I have defined $scope.startType in my controller, it did not resolve the issue. The binding should work as it is, but it isn't happening.

I reviewed several functional examples, but no luck in identifying what could be missing here.

Update: After some investigation, I realized that the CSS framework I am using was not designed with Angular in mind. It generates a customized view for the select element by hiding the actual select behind its own styling elements. Unfortunately, this setup does not trigger the angular directives or data binding. Any suggestions on how to resolve this?

javascript angularjs

Answer 1

Answer №1

If you want to connect a pre-chosen value to the select's ng-model, it's necessary to utilize ng-options.

<select id="start-type" 
        ng-model="startType" 
        ng-options="type.value as type.label for type in startTypes">

Make sure to define startTypes in your controller:

$scope.startTypes = [{value:'day-of-week', label:'Day of Week'}, ...]

modification

As suggested by @John S, consider including a default/blank option when $scope.startType == undefined to ensure proper rendering on the UI.

<option ng-selected="true" value="">select a market vertical</option>

source = Why does AngularJS include an empty option in select?

Answer 2

If you want to connect a pre-chosen value to the select's ng-model, it's necessary to utilize ng-options.

<select id="start-type" 
        ng-model="startType" 
        ng-options="type.value as type.label for type in startTypes">

Make sure to define startTypes in your controller:

$scope.startTypes = [{value:'day-of-week', label:'Day of Week'}, ...]

modification

As suggested by @John S, consider including a default/blank option when $scope.startType == undefined to ensure proper rendering on the UI.

<option ng-selected="true" value="">select a market vertical</option>

source = Why does AngularJS include an empty option in select?

Answer 3

Answer №2

In my approach, I rely on the ng-model and ng-change directives. The ng-change directive triggers an evaluation every time the selected value changes.

Answer 4

In my approach, I rely on the ng-model and ng-change directives. The ng-change directive triggers an evaluation every time the selected value changes.

Answer 5

Answer №3

I have a solution that is functioning well. Take a look at the code below

Ensure that the controller and the app are declared correctly
Try using ng-options and populate the values from the controller as shown in this example.

angular.module('demo', []).controller('DemoController', function($scope) {
  $scope.logModelValue = function() {
    console.log($scope.startType);
  };
});

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

<body ng-app="demo">
  <div ng-controller="DemoController">
    <label for="start-type">Start type</label>
    <select id="start-type" ng-model="startType" ng-change="logModelValue()">
      <option value="day-of-week">Day of the week</option>
      <option value="month">Month</option>
      <option value="month-day">Day and month</option>
      <option value="year">Year</option>
      <option value="year-month">Month and year</option>
      <option value="local-time" selected>Time</option>
      <option value="local-date">Date</option>
      <option value="local-date-time">Date and time</option>
    </select>
    <span>{{startType}}</span>
    <button ng-click="logModelValue()">Console log model value</button>
  </div>
</body>

UPDATE
Seems like there might be an issue with integrating materializecss and angular smoothly. You can either create custom angular wrappers for materializecss or utilize this library angular-materialize

Answer 6

I have a solution that is functioning well. Take a look at the code below

Ensure that the controller and the app are declared correctly
Try using ng-options and populate the values from the controller as shown in this example.

angular.module('demo', []).controller('DemoController', function($scope) {
  $scope.logModelValue = function() {
    console.log($scope.startType);
  };
});

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>

<body ng-app="demo">
  <div ng-controller="DemoController">
    <label for="start-type">Start type</label>
    <select id="start-type" ng-model="startType" ng-change="logModelValue()">
      <option value="day-of-week">Day of the week</option>
      <option value="month">Month</option>
      <option value="month-day">Day and month</option>
      <option value="year">Year</option>
      <option value="year-month">Month and year</option>
      <option value="local-time" selected>Time</option>
      <option value="local-date">Date</option>
      <option value="local-date-time">Date and time</option>
    </select>
    <span>{{startType}}</span>
    <button ng-click="logModelValue()">Console log model value</button>
  </div>
</body>

UPDATE
Seems like there might be an issue with integrating materializecss and angular smoothly. You can either create custom angular wrappers for materializecss or utilize this library angular-materialize

Bind AngularJS data to select elements

Answer №1

modification

Answer №2

Answer №3

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