javascript - How to detect user interaction in a directive -

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hello want track action when user add new chips run save function

html :

<md-chips ng-model="contacts" md-autocomplete-snap="">     <md-autocomplete       md-selected-item="selecteditem"        md-search-text="searchtext"        md-items="item in querysearch(searchtext)"        md-item-text="item.name"        placeholder="specify reviewer(s)">          <span md-highlight-text="searchtext">{{item.name}} {{item.email}}</span>     </md-autocomplete>     <md-chip-template>         <span>             {{$chip.email || $chip}}<br>         </span>     </md-chip-template> </md-chips>

js :

$scope.$watch('contacts', function(){     if ($scope.chip){         alert("hello")     } })

use md-on-append

   <md-chips md-on-append="newemail($chip)"... >

https://github.com/angular/material/tree/master/src/components/chips/demobasicusage


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