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When i was working first time in ionic framework with search module. i fetch one issue i can't get ng-model value in angular js controller on submit form. i was try like $scope.form because if you work on angular JS before then you can get all post data using $scope.form directly, But i try with bellow form and try to get that way but i always find undefined value on form, But at last i found how to solve this issue. you can see bellow example and find your solution.

Form

<form method="POST" name="searchForm" ng-submit="search()">
  <div class="item item-input-inset">
    <label class="item item-input">
      <input ng-model="form.keyword" type="text" required>
    </label>
    <button class="button-calm" type="submit">
      <i class="icon ion-search"></i>
    </button>
  </div>
</form>

Controller

.controller('SearchCtrl', function($scope,$http) {
  $scope.posts = [];
  $scope.search=function(){
    var form = this.form;
    console.log(form);
    
    $http.post(url+'/api/get_search_post',form).success(function(items) {
          $scope.posts = $scope.posts.concat(items.data);
      });
  };
});