The function is not triggered when the select tag is changed

Question

The function is not triggered when the select tag is changed

I'm currently working on implementing a drop-down menu using the <select> element in HTML. Here is the code snippet I have so far:

<select id="Parameter1" onchange="function1()">
  <option value = "0105" name = "Frequency">Frequency</option>
  <option value = "0106" name = "Motor Current">Motor Current</option>
</select>

The AngularJS function that I am attempting to execute is as follows:

$scope.function1 = function(){
  var paramId = document.getElementById("Parameter1").value; 
}

However, when running this code, I encounter an error message:

Uncaught ReferenceError: function1 is not defined

Any assistance on resolving this issue would be greatly appreciated.

javascript angularjs drop-down-menu angularjs-scope onchange

Answer 1

Answer №1

When working with AngularJS, it is crucial to utilize ng-* directives for better functionality:

<select id="Parameter1" ng-change="function1()">
  <option value = "0105" name = "Frequency">Frequency</option>
  <option value = "0106" name = "Motor Current">Motor Current</option>
</select>

The ng-change attribute is a specialized AngularJS Directive that connects with your $scope and offers dynamic capabilities, whereas the onchange event is simply traditional JavaScript.

This applies to various other directives like:

ng-src
ng-href
ng-click

Answer 2

When working with AngularJS, it is crucial to utilize ng-* directives for better functionality:

<select id="Parameter1" ng-change="function1()">
  <option value = "0105" name = "Frequency">Frequency</option>
  <option value = "0106" name = "Motor Current">Motor Current</option>
</select>

The ng-change attribute is a specialized AngularJS Directive that connects with your $scope and offers dynamic capabilities, whereas the onchange event is simply traditional JavaScript.

This applies to various other directives like:

ng-src
ng-href
ng-click

Answer 3

Answer №2

Give the ng-change directive a try. The onchange callback is specifically tailored for pure DOM manipulation.

According to Angular, "Evaluate the provided expression when there is a change in user input. This evaluation happens immediately, as opposed to the JavaScript onchange event which typically only triggers at the conclusion of a change (such as when the user exits the form element or hits the return key)"

For more information, check out: https://docs.angularjs.org/api/ng/directive/ngChange

Answer 4

Give the ng-change directive a try. The onchange callback is specifically tailored for pure DOM manipulation.

According to Angular, "Evaluate the provided expression when there is a change in user input. This evaluation happens immediately, as opposed to the JavaScript onchange event which typically only triggers at the conclusion of a change (such as when the user exits the form element or hits the return key)"

For more information, check out: https://docs.angularjs.org/api/ng/directive/ngChange

Answer 5

Answer №3

It is recommended to utilize the ng-change directive rather than onchange because function1 operates within the controller's scope.

var app = angular.module('myApp', []);
app.controller('ctrl', function($scope) {
  $scope.value = '0105';
  $scope.function1 = function() {
    alert($scope.value);
  }
});

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.15/angular.min.js"></script>
<div ng-app='myApp' ng-controller='ctrl'>
  <select id="Parameter1" ng-change="function1()" ng-model='value'>
    <option value="0105" name="Frequency">Frequency</option>
    <option value="0106" name="Motor Current">Motor Current</option>
  </select>
  {{value}}
</div>

If you choose to use onchange, ensure your handler function resides within the global scope

Edit: Additionally, when implementing function1, remember to utilize scope variables in an angular environment.

Answer 6

It is recommended to utilize the ng-change directive rather than onchange because function1 operates within the controller's scope.

var app = angular.module('myApp', []);
app.controller('ctrl', function($scope) {
  $scope.value = '0105';
  $scope.function1 = function() {
    alert($scope.value);
  }
});

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.15/angular.min.js"></script>
<div ng-app='myApp' ng-controller='ctrl'>
  <select id="Parameter1" ng-change="function1()" ng-model='value'>
    <option value="0105" name="Frequency">Frequency</option>
    <option value="0106" name="Motor Current">Motor Current</option>
  </select>
  {{value}}
</div>

If you choose to use onchange, ensure your handler function resides within the global scope

Edit: Additionally, when implementing function1, remember to utilize scope variables in an angular environment.

The function is not triggered when the select tag is changed

Answer №1

Answer №2

Answer №3

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