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calc.html
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<!DOCTYPE html>
<html>
<head>
<title>calculator</title>
<style type="text/css">
.error {
color: red;
}
.errorWrapper {
opacity: .7;
}
</style>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.2.15/angular.min.js"></script>
</head>
<body data-ng-app="calc">
<div data-ng-controller="CalcController">
<form novalidate onsubmit="return false;" ng-model="calcForm">
<label>Input: <input ng-model="calcForm.input" ng-init="calcForm.input=''"></label>
<button ng-click="update(calcForm)">SAVE</button>
</form>
<div data-ng-if="result !== null">
{{result}}
</div>
<div data-ng-if="error && error.length > 0">
{{error[0][1]}}<br>
{{ calcForm.input.substring(0, error[0][0][0]) }}<span class="error">{{ calcForm.input.substring(error[0][0][0], error[0][0][1]) }}</span>{{ calcForm.input.substring(error[0][0][1]) }}
<span data-ng-repeat="err in error.slice(1)">
<br>
{{ calcForm.input.substring(0, err[0]) }}<span class="error">{{ calcForm.input.substring(err[0]) }}</span> - {{ err[1] }}
</span>
</div>
</div>
<script type="text/javascript" src="calc.js"></script>
</body>
</html>