javascript - override default angularjs error messages - "Required" "Invalid" -

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i have input field, have show error messages, not working.. error messages not shown.

     <div class="form-group grouped">         <div>           <label for="card-routingnumber">number:</label>           <input name="cr" ng-model="card.rn" type="number" pattern="[0-9]*" id="card-rn" class="form-control" validate-on="submit" required />            <span class="help-block" ng-show"form.cr.$error.required">field empty</span>       </div>     </div>

when click on submit, need show error message if input empty.. when try... says "required"

add "novalidate" attribute form.


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