我有以下形式:
<form name="editUserForm" ng-cloak="">
<md-input-container layout-margin>
<label>Available Groups</label>
<md-select id="groups" ng-model="vm.selectedGroup" ng-model-options="{ trackBy: '$value.id' }" md-on-close="vm.clearGroupSearchTerm()"
data-md-container-class="selectdemoSelectHeader" multiple required>
<md-select-header class="demo-select-header">
<input id="searchGroup" ng-model="vm.groupSearchTerm" type="search" placeholder="Search available groups" class="demo-header-searchbox md-text"
ng-keydown="$event.stopPropagation()">
</md-select-header>
<md-optgroup label="Groups">
<md-option ng-value="group" ng-repeat="group in vm.groups |filter:vm.groupSearchTerm">{{group.name}}</md-option>
</md-optgroup>
</md-select>
</md-input-container>
<div layout="row" layout-align="end">
<md-button id="buttonCancel" class="md-raised md-primary" ui-sref="search.users" type="submit">Cancel</md-button>
<md-button id="buttonSave" class="md-raised md-primary" ng-disabled="editUserForm.$invalid" ng-click="vm.addOrUpdateUser()"
type="submit">Save</md-button>
</div>
</div>
</div>
</form>
选择默认选项框是异步加载的:
/* @ngInject */
function UserController($scope, $state, $stateParams, $element,
usersService, groupsService, groupNameRegex, logger) {
var vm = this;
editUser()
function editUser() {
usersService.getUser($stateParams.userId).
then(function (data) {
vm.user = data;
for (var i = 0; i < data.userGroups.length; i++) {
vm.selectedGroup.push(data.userGroups[i].group);
}
// vm.selectedGroup = [{ id: 101, name: 'group1' }];
});
}
...
问题是,即使模型'vm.selectedgroup'正确加载并显示了"保存"按钮时,"保存"按钮也将被禁用。如果我将结果进行编码,则一切正常。看起来"必需"属性会在返回承诺之前评估输入选项。我也读到,仅在首次选择选项后评估异步调用的"必需"属性。
所以我的问题是,使用" $ nive"的正确方法是什么,而默认值则是对'md-select'元素加载的默认值。
有两种解决方案,如果角度专家可以解释为什么第一个有效的方法,我会很高兴。
解决方案1:看起来只是更改数组的初始化方式足以满足"必需"选项。
请参阅' vm.selectedGroup = null; '和' vm.selectedgroup = []; '
/* @ngInject */
function UserController($scope, $state, $stateParams, $element,
usersService, groupsService, groupNameRegex, logger) {
var vm = this;
vm.selectedGroup = null;
function editUser() {
getUserGroups(vm.customerId);
usersService.getUser($stateParams.userId).
then(function (data) {
vm.user = data;
vm.selectedGroup = [];
for (var i = 0; i < data.userGroups.length; i++) {
vm.selectedGroup.push(data.userGroups[i].group);
}
vm.selectedStatus = { code: data.enabled, name: '' };
vm.selectedRole = data.authority;
});
}
解决方案2:遵循有关异步验证的角示例,我创建了以下指令:
(function () {
'use strict';
angular
.module('app.groups')
.directive('groupRequired', groupRequired);
/* @ngInject */
function groupRequired(usersService, $stateParams, $q) {
return {
require: 'ngModel',
link: function (scope, element, attributes, ngModel) {
ngModel.$asyncValidators.groupRequired = function (modelValue, viewValue) {
var selectedGroup = scope.vm.selectedGroup;
var def = $q.defer();
if (modelValue.length === 0 && selectedGroup.length === 0) {
return usersService.getUser($stateParams.userId).
then(function (data) {
if (data.userGroups.length > 0) {
ngModel.$setValidity('async', true);
} else {
ngModel.$setValidity('async', false);
}
});
} else {
if (modelValue.length > 0) {
ngModel.$setValidity('async', true);
} else {
ngModel.$setValidity('async', false);
}
return $q.resolve();
}
};
}
};
}
}());
客户端使用群体需要的而不是必需:
<form name="editUserForm" ng-cloak="">
<md-input-container layout-margin>
<label>Available Groups</label>
<md-select id="groups" ng-model="vm.selectedGroup" ng-model-options="{ trackBy: '$value.id' }" md-on-close="vm.clearGroupSearchTerm()"
data-md-container-class="selectdemoSelectHeader" multiple group-required>
它的工作正常,但复杂性是十倍!