javascript 如何要求至少 1 个复选框用于 AngularJS 表单验证？
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How to require at least 1 checkbox for AngularJS Form Validation?
提问by Actively
I have an array of JSON objects which is displayed in a form. I would like to have the form validation work where a user has to select at least one checkbox for the entire form to be valid.
我有一个以表格形式显示的 JSON 对象数组。我想让表单验证工作，用户必须至少选择一个复选框才能使整个表单有效。
I know that the ng-requiredcan be used but with the implementation I have, it means that all of them have to be selected for it to be valid.
我知道ng-required可以使用，但是对于我的实现，这意味着必须选择所有这些才能使其有效。
Here is the code I have so far:
这是我到目前为止的代码：
index.html:
索引.html：
<div ng-repeat="item in volunteerOptions">
<label class="checkbox"><input type="checkbox" value="" data-ng-model="item.selected" ng-required="true">{{ item.content }}</label>
</div>
<button type="submit" class="btn btn-success" ng-disabled="!memberRegistrationForm.$valid">Submit</button>
controller.js
控制器.js
$scope.volunteerOptions = [
{ content : 'Content 1', selected : false },
{ content : 'Content 2', selected : false },
{ content : 'Content 3', selected : false },
{ content : 'Content 4', selected : false },
];
Any ideas on how I would be able to achieve this behaviour?
关于我如何能够实现这种行为的任何想法？
回答by Joseph
You can add another scope property and use array.someto check if any of the selectedare true. Then feed that scope property to ng-required. Something like
您可以添加另一个范围属性并用于array.some检查是否有任何selectedare true。然后将该范围属性提供给ng-required. 就像是
$scope.isOptionsRequired = function(){
return !$scope.volunteerOptions.some(function(options){
return options.selected;
});
}
<input type="checkbox" value="" data-ng-model="item.selected" ng-required="isOptionsRequired()">
