AngularJS ng change Directive
AngularJS ng-change Directive
The ng-change directive is used to tell AngularJS what to do when the value of an HTML element changes. It requires the ng-model directive to be present. It will not override the element original onchange event. Both the ng-change expression and the original onchange event will be executed.
< element ng-change="expression" >< /element >
|expression||An expression to execute when an element's value changes.|