[英]Angular Directive DOM manipulation behavior
我在指令中使用DOM操作有一些意想不到的行为。 我有两个图标,想要图标,电话和电子邮件,并希望在悬停时显示其内容。 哪个应该足够简单,但是我无法遍历DOM以达到子元素。
这是我的指令:
app.directive('contact', function () {
return {
restrict: 'E',
scope: {
email:'@',
phone: '@',
extension: '@'
},
link: function (scope, element, attrs) {
var el = element;
var kids = $(el).children();
var emailChild = $(kids[0]);
var email = emailChild.context.children[0];
element.children().bind('mouseenter', function() {
console.log(this);
console.log(emailChild.context.children[0]);
console.log(email);
});
},
template: '<div class="contact_methods">' +
'<div ng-if="email" class="email" href="#">' +
'<div class="contact_info_email more_info" style="display:none;"><a ng-href="mailto:{{email}}">{{email}}</a></div>' +
'</div> ' +
'<div ng-if="phone" class="phone" href="#"> ' +
'<div class="contact_info_phone more_info">{{phone}} ext.{{extension}}</div>' +
'</div>' +
'</div>'
}
});
这是意外的行为:
console.log(this);
console.log(emailChild.context.children[0]);
console.log(email);
这些评估为:
<div class="contact_methods">…</div>
<div ng-if="email" class="email ng-scope" href="#">…</div>
undefined
电子邮件输出undefined; 然而,它的内容是它上面的线? 另外,我无法像element.children()。children()一样深入研究它? 悬停停止工作。
您不需要在此处进行DOM访问,而只需使用ng-events。 在您的情况下ng-mouseenter
ng-mouseleave
结合ng-show
。
<div ng-if="email" class="email" href="#"
ng-mouseenter="toggleEmail(true)" ng-mouseleave="toggleEmail(false)">Email
<div class="contact_info_email more_info" ng-show="displayEmail">
<a ng-href="mailto:{{email}}">{{email}}</a></div>
并在链接功能:
link: function (scope, element, attrs) {
scope.toggleEmail = function(shouldShow){
scope.displayEmail = shouldShow;
}
},
示例演示
angular.module('app', []).controller('ctrl', function($scope) { $scope.email = "aaa@aa.com"; $scope.phone = "111-222-3333"; }).directive('contact', function() { return { restrict: 'E', scope: { email: '@', phone: '@', extension: '@' }, link: function(scope, element, attrs) { scope.toggleEmail = function(shouldShow) { scope.displayEmail = shouldShow; } }, template: '<div class="contact_methods"> \\ <div ng-if="email" class="email" href="#" ng-mouseenter="toggleEmail(true)" ng-mouseleave="toggleEmail(false)">Email \\ <div class="contact_info_email more_info" ng-show="displayEmail"><a ng-href="mailto:{{email}}">{{email}}</a></div> \\ </div> \\ <div ng-if="phone" class="phone" href="#">Phone \\ <div class="contact_info_phone more_info">{{phone}} ext.{{extension}}</div> \\ </div> \\ </div>' } });;
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script> <div ng-app="app" ng-controller="ctrl"> <contact email="{{email}}" phone="{{phone}}"></contact> </div>
我甚至会为这个指令使用一个控制器,并在那里设置范围方法和变量。 此外,您可以将模板放在外部而不是内联模板,因为它更大,难以在javascript文件中维护。
您的方法的问题是您在这里选择了错误。 因为实际的根将是元素<contact
所以孩子不是你所期望的。 还记得你不需要再次使用$(element)
包装element
,因为它已经是一个jquery包装器元素(假设你在angular之前包含了jquery)。 所以你也可以这样做(尽管我会以这种方式重新思考):
//Let the directive render DOM first
$timeout(function() {
element.find('.email, .phone').bind('mouseenter mouseleave', function() {
$(this).children().toggle()
});
});
angular.module('app', []).controller('ctrl', function($scope) { $scope.email = "aaa@aa.com"; $scope.phone = "111-222-3333"; }).directive('contact', function($timeout) { return { restrict: 'E', scope: { email: '@', phone: '@', extension: '@' }, link: function(scope, element, attrs) { $timeout(function() { element.find('.email, .phone').bind('mouseenter mouseleave', function() { $(this).children().toggle() }); }); }, template: '<div class="contact_methods">' + '<div ng-if="email" class="email" href="#"> Email' + '<div class="contact_info_email more_info" style="display:none;"><a ng-href="mailto:{{email}}">{{email}}</a></div>' + '</div> ' + '<div ng-if="phone" class="phone" href="#"> Phone' + '<div class="contact_info_phone more_info" style="display:none;">{{phone}} ext.{{extension}}</div>' + '</div>' + '</div>' } });;
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script> <div ng-app="app" ng-controller="ctrl"> <contact email="{{email}}" phone="{{phone}}"></contact> </div>
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