Disable form submit on multiple ui-select for Angularjs

When using the multiple version of UI-Select for AngularJS the form is submitted once a user presses enter. Many users start typing a tag and press enter to select it and search for a new one. But once the users presses enter the form is submitted.

What is the best 'Angular' way to disabled this?

See example

<form ng-submit="submit()">
  <ui-select multiple ng-model="multipleDemo.colors" theme="select2"  style="width: 300px;">
    <ui-select-match placeholder="Select colors...">{{$item}}</ui-select-match>
    <ui-select-choices repeat="color in availableColors | filter:$select.search">
      {{color}}
    </ui-select-choices>
  </ui-select>
  <p>Selected: {{multipleDemo.colors}}</p>

  <div style="height:500px"></div>
  </form>

If I understand your requirement, this solution will work for you. Please leave your comment if you want to achieve something else.

index.html

<ui-select ng-keypress="selec2_keypress($event)" multiple ng-model="multipleDemo.colors" theme="select2"  style="width: 300px;">

demo.js

 $scope.selec2_keypress = function(event) {
    if (event.which === 13)
      event.preventDefault();
  }