如果其他字段未完成，AngularJS禁用输入类型按钮

我有一个轮询，希望禁用输入类型按钮，直到您从轮询选项中选择了单选按钮。这就是我目前所拥有的

<div class="options" ng-hide="$root.offline">
        <div class="overlay overlay--loading" ng-show="poll.loading"></div>
        <div class="option" ng-repeat="option in poll.options">
            <label>
                <input type="radio" ng-model="$parent.response" name="poll-{{poll.ID}}" value="{{ option.option }}">
                <span class="radiobtn" ng-hide="poll.answered"></span>
                <span compile="option.option"></span>
            </label>
            <div class="result" ng-show="poll.answered">
                <div class="result-bar">
                    <div ng-attr-style="{{'width: '+ option.percentage +'%;'}}"></div>
                </div>
                <div class="result-percentage">{{ option.percentage ? option.percentage : 0 }}%</div>
            </div>
        </div>
        <input type="button" value="Vote" ng-hide="poll.answered || $root.offline" ng-click="vote()" ng-disabled="!$parent.response" />
    </div>  

{{option.percentage？option.percentage:0}}%

这将禁用按钮，但当我选择一个选项时，它仍然被禁用

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任何帮助都将不胜感激。谢谢

修复了它。无法在循环外调用父级

<input type="button" value="Vote" ng-hide="poll.answered || $root.offline" ng-click="vote()" ng-disabled="!response" />