当我执行此脚本时,aForm.aField。$ error包含{“required”:true}但是$ scope.fruit未设置为undefined,即使它不在md-option值中。因此,“必需”验证已完成,但未设置为未定义。
<!doctype html>
<html ng-app="anApp">
<head>
<link rel="stylesheet" href="bower_components/angular-material/angular-material.min.css">
<script src="bower_components/angular/angular.js"></script>
<script src="bower_components/angular-messages/angular-messages.min.js"></script>
<script src="bower_components/angular-material/angular-material.js"></script>
<script src="bower_components/angular-animate/angular-animate.min.js"></script>
<script src="bower_components/angular-aria/angular-aria.min.js"></script>
<script>
angular.module('anApp', ['ngMessages', 'ngMaterial'])
.controller('aController', function ($scope, $timeout) {
$scope.fruitBasket = [{name:"apple", id:1}];
$scope.fruit = 100;
$scope.required = true;
});
</script>
</head>
<body ng-controller="aController">
{{aForm.aField.$error}}<br> [{{fruit}}]
<br>
<form name="aForm">
<md-input-container>
<label>Fruit</label>
<md-select name="aField" ng-required="required" ng-model="fruit">
<md-option ng-repeat="unFruit in fruitBasket" ng-value="unFruit.id"> {{unFruit.name}} </md-option>
</md-select>
<div ng-messages="aForm.aField.$error">
<div ng-message="required">Fruit required</div>
</div>
</md-input-container>
</form>
</body>
</html>
但是当我执行这个脚本时,执行超时后$ scope.fruit被设置为undefined:
<!doctype html>
<html ng-app="anApp">
<head>
<link rel="stylesheet" href="bower_components/angular-material/angular-material.min.css">
<script src="bower_components/angular/angular.js"></script>
<script src="bower_components/angular-messages/angular-messages.min.js"></script>
<script src="bower_components/angular-material/angular-material.js"></script>
<script src="bower_components/angular-animate/angular-animate.min.js"></script>
<script src="bower_components/angular-aria/angular-aria.min.js"></script>
<script>
angular.module('anApp', ['ngMessages', 'ngMaterial'])
.controller('aController', function ($scope, $timeout) {
$scope.fruitBasket = [{name:"apple", id:1}];
$scope.fruit = 100;
$scope.required = false;
$timeout(function() {
$scope.required = true;
}, 1000);
});
</script>
</head>
<body ng-controller="aController">
{{aForm.aField.$error}}<br> [{{fruit}}]
<br>
<form name="aForm">
<md-input-container>
<label>Fruit</label>
<md-select name="aField" ng-required="required" ng-model="fruit">
<md-option ng-repeat="unFruit in fruitBasket" ng-value="unFruit.id"> {{unFruit.name}} </md-option>
</md-select>
<div ng-messages="aForm.aField.$error">
<div ng-message="required">Fruit required</div>
</div>
</md-input-container>
</form>
</body>
</html>
当我查看angular的代码时,在调用$$ runValidators时,这个“prevValid”条件似乎会影响“set to undefine”mecanism。
所以看起来md-select(因为有角度)并不总是在模型不是有效值时将模型设置为undefined。
如果我想要第一个脚本(没有超时的脚本)将模型设置为undefined,因为它的值不在md-option值中,我该怎么办?
这些行为是否记录在某处?
有什么规则?
答案 0 :(得分:1)
最后我终于在棱角分明的文档中找到了答案......
运行每个已注册的验证器(第一个同步验证器,然后运行异步验证器)。如果有效性更改为无效,则模型将设置为undefined,除非ngModelOptions.allowInvalid为true。如果有效性更改为有效,则会将模型设置为最后一个可用的有效$ modelValue,即最后一个已解析的值或从范围设置的最后一个值。
当字段设置为必需时,有效性状态从true变为false。