Validate controls within ng-repeat: textbox and textarea - angularjs

Question

I am using Angular js, in which i have a textbox outside and an ng-repeat containing textbox and textarea. I want to check if the fields contain value when submit button is clicked. I am able to achieve the functionality for controls outside ng-repeat, but not sure how to achieve required field validation within ng-repeat, when submit button is click. Below is the existing code:
<form name="mainForm" id="createForm" ng-submit="mainForm.$valid && add()" novalidate>
<div ng-controller="testController" ng-init="init()">
<div>
<label>Name :</label>
</div>
<div>
<input type="text" maxlength="150" required ng-model="testName" name="testName" />
</div>
</div>
<span style="color:red" ng-show="submitted == true && mainForm.testName.$error.required">Name is required</span>
<br />
<div class="row">
<div class="form-group ">
<label>Language</label>
<label>Title</label>
<label>Description</label>
</div>
</div>
<div class="row">
<div>
<div ng-repeat="Descriptions in testsWithDescription ">
<div>
<label ng-model="Descriptions.Language">{{Descriptions.Language}}</label>
</div>
<div>
<input type="text" maxlength="150" name="titleValidate[]" ng-model="Descriptions.Title" />
</div>
<div>
<textarea maxlength="500" name="descriptionValidate[]" noresize ng-model="Descriptions.Description"></textarea>
</div>
<div class="form-group col-md-1">
<a style="cursor:pointer"><img ng-src="{{DeleteIcon_url}}" alt="delete image" ng-click="($index == !selectedDeleteIcon) ||testsWithDescription.splice($index,1)" ng-class="{'disabled': $first}" /> </a>
</div>
</div>
</div>
</div>
<input type="submit" value="Submit" ng-click="submitted=true"/>
How to use required field validation for controls within ng-repeat using angular js?
Thanks

Answer 1

You could use $index to track the name of the different inputs in your ng-repeat.
<div ng-repeat="Descriptions in testsWithDescription ">
<input type="text"
maxlength="150"
name="titleValidate_{{$index}}"
ng-model="Descriptions.Title"
required />
</div>
You can now use the common validations from AngularJS like you already did: mainForm.$valid.