Setting a default value in ng-options can be accomplished by using the ng-init

Question

Setting a default value in ng-options can be accomplished by using the ng-init

One way to set a dropdown list with a default value in AngularJS is by using the following code:

<select name="repeatSelect" id="repeatSelect" ng-model="repeatSelect" ng-init="repeatSelect = data[0].id">
    <option ng-repeat="option in data" value="{{option.id}}">{{option.name}}</option>
</select>

Alternatively, you can achieve the same result using ng-options. Attempting this method may look like:

<select name="repeatSelect" 
   id="repeatSelect" 
   ng-model="repeatSelect"
   ng-init="repeatSelect = option.id"  
   ng-options="option.name for option in data track by option.id">
</select>

However, if this second method does not work as expected, you can refer to a sample fiddle provided here.

javascript angularjs html-select ng-options

Answer 1

Answer №1

Utilize the ng-init directive to establish a default value for the ng-options in AngularJS.

You can view the demonstration here: demo

<select name="repeatSelect" 
   id="repeatSelect" 
   ng-model="repeatSelect"
   ng-init=" repeatSelect = data[0].id"  
   ng-options="option.id as option.name for option in data">          
</select>

Answer 2

Utilize the ng-init directive to establish a default value for the ng-options in AngularJS.

You can view the demonstration here: demo

<select name="repeatSelect" 
   id="repeatSelect" 
   ng-model="repeatSelect"
   ng-init=" repeatSelect = data[0].id"  
   ng-options="option.id as option.name for option in data">          
</select>

Answer 3

Answer №2

Using ng-init incorrectly.

The misuse of ngInit is highlighted in the Angular documentation:

ngInit can lead to unnecessary complexity in templates. It should only be used for specific cases such as aliasing properties in ngRepeat or passing data from server side scripting. In most situations, controllers should be used instead of ngInit for initializing scope values.

Source documentation

In my view, the best way to set a default value is to pre-fill your ng-model with the selected value from ng-options, letting Angular handle the rest.

When defining the $scope property, the select element will automatically bind to the default value from your data array. If the data comes from an AJAX request, simply assign it once the data is retrieved.

.controller('test', ['$scope', function ($scope) {
    $scope.data = [{name: 'one', id: 1}, {name: 'two', id: 2},{name: 'three', id: 3}];
    $scope.repeatSelect= $scope.data[0];
}]);

One thing to note is that when using the as keyword in your expression, you must assign your ng-model with the specific property to select.

For a complete demonstration, check out this fiddle showcasing both scenarios: http://jsfiddle.net/kb99gee8/

Answer 4

Using ng-init incorrectly.

The misuse of ngInit is highlighted in the Angular documentation:

ngInit can lead to unnecessary complexity in templates. It should only be used for specific cases such as aliasing properties in ngRepeat or passing data from server side scripting. In most situations, controllers should be used instead of ngInit for initializing scope values.

Source documentation

In my view, the best way to set a default value is to pre-fill your ng-model with the selected value from ng-options, letting Angular handle the rest.

When defining the $scope property, the select element will automatically bind to the default value from your data array. If the data comes from an AJAX request, simply assign it once the data is retrieved.

.controller('test', ['$scope', function ($scope) {
    $scope.data = [{name: 'one', id: 1}, {name: 'two', id: 2},{name: 'three', id: 3}];
    $scope.repeatSelect= $scope.data[0];
}]);

One thing to note is that when using the as keyword in your expression, you must assign your ng-model with the specific property to select.

For a complete demonstration, check out this fiddle showcasing both scenarios: http://jsfiddle.net/kb99gee8/

Answer 5

Answer №3

I successfully implemented the solution using your code and incorporating ng-options as you suggested. For a working example, please refer to this live demo

Complete CODE:

<div ng-app="ngrepeatSelect">
    <div ng-controller="ExampleController">
        <form name="myForm">
            <label for="repeatSelect">Angular select:</label>
            <select name="repeatSelect" 
   id="repeatSelect" 
   ng-model="repeatSelect"
   ng-init=" repeatSelect = data[0]"  
   ng-options="option.name for option in data track by option.id">
</select>
        </form>
        <br/> <tt>Selected value: {{repeatSelect.id}}</tt>

    </div>
</div>
<br/>

Answer 6

I successfully implemented the solution using your code and incorporating ng-options as you suggested. For a working example, please refer to this live demo

Complete CODE:

<div ng-app="ngrepeatSelect">
    <div ng-controller="ExampleController">
        <form name="myForm">
            <label for="repeatSelect">Angular select:</label>
            <select name="repeatSelect" 
   id="repeatSelect" 
   ng-model="repeatSelect"
   ng-init=" repeatSelect = data[0]"  
   ng-options="option.name for option in data track by option.id">
</select>
        </form>
        <br/> <tt>Selected value: {{repeatSelect.id}}</tt>

    </div>
</div>
<br/>

Answer 7

Answer №4

Here is an example of HTML code snippet:

<select class="form-control" ng-model="data.selectedOption" required ng-options="option.name as option.name for option in venueNamelists"  ng-change="getmediationRooms(data.selectedOption)"></select>

Within my controller:

$scope.data = {selectedOption: $scope.venueNamelists[i].name};

The value of the model should match the key,value pair within the venueNamelists.

Answer 8

Here is an example of HTML code snippet:

<select class="form-control" ng-model="data.selectedOption" required ng-options="option.name as option.name for option in venueNamelists"  ng-change="getmediationRooms(data.selectedOption)"></select>

Within my controller:

$scope.data = {selectedOption: $scope.venueNamelists[i].name};

The value of the model should match the key,value pair within the venueNamelists.

Setting a default value in ng-options can be accomplished by using the ng-init

Answer №1

Answer №2

Answer №3

Answer №4

Similar questions

Setting up computed properties in VueJSSetting up computed values in

Troubleshoot: Issues arising when loading DataTables using AJAX with MYSQL

What is the best way to require users to click one of the toggle buttons in a form?

POST request body is not defined

Ways to transfer a jQuery variable value to a PHP variable

exciting, showcasing a dependency map using svg within an html5 environment

The "results per page" ajax dropdown in Yii stops working after other ajax content is loaded on the page

@HostBinding in Angular 2 does not trigger change detection

Encountering the issue of "unexpected error: autocomplete is not defined" when trying to retrieve information

JavaScript: Populating an Array with Image URLs Using a Loop

Transform a REACT js Component into an HTML document

Why is MutationRecord[] organized as an array in MutationObserver?

Issues detected with the functionality of Angular HttpInterceptor in conjunction with forkJoin

Instructions on how to make a radio button selected when clicked are as follows:

Retrieving an attribute through the act of clicking a button

The issue lies in AngularJS where updating data that is bound does not automatically update the corresponding template

Setting up Visual Studio Code for debugging HTML and JavaScript code

Setting the data type for a React Stateless Functional Component (SFC) in TypeScript

How PHP Processes Fragment Identifiers within URLs

FingerprintJS is experiencing an issue with the navigator object not being defined, resulting in