使用Angular我使用特定指令验证单个输入字段。 （即电子邮件，用户名等）
在这个项目中我有这个场景：
我需要设置预付款字段，此预付款必须介于最小/最大值之间。 要设置Advance，我有三个输入文本：
这三个输入的总和是我的高级值。
所以我需要验证Advance，但我没有设置ng-model的单一输入。
检查和验证预付款值的最佳方法是什么？
我需要为所有这三个输入字段添加一个指令吗？或者更好的表格指令？
任何建议都将受到赞赏。
(function () {
var app = angular.module("myApp", ['ngMessages']);
app.controller('myFormCtrl', function($scope) {
$scope.plan = {};
$scope.plan.advance = 0;
$scope.plan.min_advance = 3000;
$scope.plan.max_advance = 6000;
$scope.updateAdvance = function(){
var advance = 0;
if ($scope.quotationAdvanceType && !isNaN($scope.plan.quotation))
advance += $scope.plan.quotation;
if ($scope.cashAdvanceType && !isNaN($scope.plan.cash))
advance += $scope.plan.cash;
if ($scope.financedAdvanceType && !isNaN($scope.plan.financed))
advance += $scope.plan.financed;
$scope.plan.advance = advance;
}
});
})();
答案 0 :(得分：1)
只是为了给你（或许是其他人）另一种选择。
为简化起见，您可以使用数字输入，并将其ng-model设置为 plan.advance 。这将允许您使用最小/最大属性。如果您不想显示输入，可以将输入设置为隐藏。
<input type="number" name="advance" ng-model="plan.advance" min="{{plan.min_advance}}" max="{{plan.max_advance}}" hidden />
然后您可以使用min和max的内置验证，例如：
<span ng-messages="myForm.advance.$error" role="alert">
<span ng-message="min">Minimum not reached.</span>
<span ng-message="max">Maximum exceeded.</span>
</span>
运行下面的代码段以查看其实际效果：
(function () {
var app = angular.module("myApp", ['ngMessages']);
app.controller('myFormCtrl', function ($scope) {
var advance = [];
$scope.plan = {};
$scope.plan.advance = 0;
$scope.plan.min_advance = 3000;
$scope.plan.max_advance = 6000;
$scope.reset = function(val) {
$scope.plan[val] = undefined;
$scope.updateAdvance();
};
$scope.updateAdvance = function () {
advance = [$scope.plan.quotation, $scope.plan.cash, $scope.plan.financed];
$scope.plan.advance = advance.reduce(function (a, b) {
a = a ? a : 0;
b = b ? b : 0;
return a + b;
}, 0);
}
});
})();@import url("https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css");<script src="https://code.angularjs.org/1.3.15/angular.min.js"></script>
<script src="https://code.angularjs.org/1.3.15/angular-messages.min.js"></script>
<div ng-app="myApp" class="container">
<form name="myForm" ng-controller="myFormCtrl" class="form-horizontal">
<div class="form-group" ng-class="{ 'has-error' : myForm.plan.min_advance.$invalid && myForm.plan.min_advance.$touched}">
<label for="plan.min_advance" class="control-label col-xs-4 col-sm-2">Min Advance</label>
<div class="col-xs-8 col-sm-10">
<input type="number" ng-model="plan.min_advance" class="form-control" />
</div>
</div>
<div class="form-group" ng-class="{ 'has-error' : myForm.plan.max_advance.$invalid && myForm.plan.max_advance.$touched}">
<label for="plan.max_advance" class="control-label col-xs-4 col-sm-2">Min Advance</label>
<div class="col-xs-8 col-sm-10">
<input type="number" ng-model="plan.max_advance" class="form-control" />
</div>
</div>
<div class="form-group" ng-class="{ 'has-error' : myForm.surname.$invalid && myForm.surname.$touched}">
<div class="col-xs-12">
<label for="surname" class="control-label">Surname</label>
<input type="text" value="" name="surname" id="surname" ng-model="surname" ng-minlength="3" ng-mAXlength="20" required="required" class="form-control" />
<span ng-messages="myForm.surname.$error" class="help-block" role="alert" ng-show="myForm.surname.$touched">
<span ng-message="required">You forgot to enter your surname</span>
<span ng-message="minlength">Surname is too short</span>
<span ng-message="maxlength">Surname is too long</span>
</span>
</div>
</div>
<p>Set the Advance between minimun <strong>{{plan.min_advance | currency}}</strong> and maximum <strong>{{plan.max_advance | currency}}</strong>
</p>
<div class="form-group">
<label for="quotation" class="col-xs-4 col-sm-2 control-label">
<input type="checkbox" name="quotationAdvanceType" ng-model="quotationAdvanceType" ng-change="reset('quotation')"/> Quotation:
</label>
<div class="col-xs-8 col-sm-10">
<input type="number" name="quotation" ng-value="plan.quotation" ng-model="plan.quotation" ng-change="updateAdvance()" class="form-control" ng-disabled="!quotationAdvanceType" placeholder="{{'max '+ (plan.max_advance-plan.advance)}}" />
</div>
</div>
<div class="form-group">
<label for="cash" class="col-xs-4 col-sm-2 control-label">
<input type="checkbox" name="cashAdvanceType" ng-model="cashAdvanceType" ng-change="reset('cash')" /> Cash:
</label>
<div class="col-xs-8 col-sm-10">
<input type="number" name="cash" ng-value="plan.cash" ng-model="plan.cash" ng-change="updateAdvance()" class="form-control" ng-disabled="!cashAdvanceType" placeholder="{{'max '+ (plan.max_advance-plan.advance)}}" />
</div>
</div>
<div class="form-group">
<label for="financed" class="col-xs-4 col-sm-2 control-label">
<input type="checkbox" name="financedAdvanceType" ng-model="financedAdvanceType" ng-change="reset('financed')" /> Financed:
</label>
<div class="col-xs-8 col-sm-10">
<input type="number" name="financed" ng-value="0" ng-model="plan.financed" ng-change="updateAdvance()" class="form-control" ng-disabled="!financedAdvanceType" placeholder="{{'max '+ (plan.max_advance-plan.advance)}}" />
</div>
</div>
<div ng-class="{'has-error' : myForm.advance.$invalid && (quotationAdvanceType || cashAdvanceType || financedAdvanceType) && (myForm.quotation.$dirty || myForm.cash.$dirty || myForm.financed.$dirty)}">
<input type="number" name="advance" ng-model="plan.advance" min="{{plan.min_advance}}" max="{{plan.max_advance}}" hidden />
<p class="help-block">Total Advance: <strong>{{plan.advance ? (plan.advance | currency) : 'none'}}</strong>
<span ng-messages="myForm.advance.$error" role="alert" ng-show="myForm.quotation.$dirty || myForm.cash.$dirty || myForm.financed.$dirty">
<span ng-message="min">Minimum not reached.</span>
<span ng-message="max">Maximum exceeded.</span>
</span>
</p>
</div>
<button type="submit" class="btn btn-primary" ng-disabled="myForm.$invalid">Send</button>
</form>
</div>
您的自定义指令方法有优势吗？我会说是的，这就是原因：
答案 1 :(得分：0)
我用一个全新的指令解决了我的问题。 我不知道这是否是正确的方法，但它工作正常，行为是正确的。
app.directive('totalAdvance', function() {
return {
restrict: 'E',
require: '^form',
link: function(scope, element, attrs, formCtrl) {
var advanceValue = 0;
var advanceValidator = function() {
if (advanceValue >= attrs.min && advanceValue <= attrs.max){
formCtrl.$setValidity('minAdvance', true);
formCtrl.$setValidity('maxAdvance', true);
return advanceValue;
}else if (advanceValue < attrs.min) {
formCtrl.$setValidity('minAdvance', false);
formCtrl.$setValidity('maxAdvance', true);
return null;
}else if (advanceValue > attrs.max){
formCtrl.$setValidity('minAdvance', true);
formCtrl.$setValidity('maxAdvance', false);
return null;
}
};
scope.$watch('plan.advance', function(value) {
advanceValue = value;
return advanceValidator();
});
scope.$watch('plan.min_advance', function() {
return advanceValidator();
});
scope.$watch('plan.max_advance', function() {
return advanceValidator();
});
}
};
});