angularjsHow can I use the ng-change directive in AngularJS?
The ng-change
directive in AngularJS allows you to specify custom behavior when an element's value changes. It can be used to respond to user input, validate form fields, or perform calculations.
For example, if you wanted to calculate the total cost of a shopping cart, you could use the ng-change
directive to update the total when the user changes the quantity of an item:
<input type="number" ng-model="quantity" ng-change="updateTotal()">
<p>Total cost: {{total}}</p>
$scope.total = 0;
$scope.updateTotal = function() {
$scope.total = $scope.quantity * 10;
};
In the above example, the updateTotal()
function is called when the user changes the value of the quantity
input. The function then updates the total
variable, which is displayed to the user.
Here is a list of parts used in the example:
ng-change
: directive used to specify custom behavior when an element's value changesng-model
: directive used to bind an element's value to a variable in the scopeinput type="number"
: HTML input element used to accept numeric valuesupdateTotal()
: function used to update the total cost of the shopping cart$scope.total
: variable used to store the total cost of the shopping cart
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