如何在< head>中创建一个Angular指令文档的一部分? [英] How to create an Angular directive in the <head> section of a document?
问题描述
我是 angular.js
的新手。我试图创建一个指令,在html文档的< head>
部分添加一些标题和元标记,但是我遇到了一些麻烦。
我的 index.html
文档如下:
<!DOCTYPE html>
< html ng-app =myApp>
< head>
< meta charset =UTF-8>
< base href =/>
< seo-title>< / seo-title>
< script src =https://ajax.googleapis.com/ajax/libs/angularjs/1.4.1/angular.min.js>< / script>
< script src =https://code.angularjs.org/1.4.1/angular-route.min.js>< / script>
< script src =/ incl / js / myApp.js>< / script>
< / head>
< body>
< div ng-view>< / div>
< / body>
< / html>
我的javascript是:
var app = angular.module('myApp',['ngRoute']);
$ b app.config(['$ routeProvider','$ locationProvider',function($ routeProvider,$ locationProvider){
$ routeProvider
.when(' /',{templateUrl:'routes / home.html'})
.when('/ pageA',{templateUrl:'routes / pageA.html'})
.when('/ pageB' ,{templateUrl:'routes / pageB.html'})
.otherwise({redirectTo:'/'});
$ locationProvider.html5Mode({
enabled:true
});
}]);
app.directive('seoTitle',function(){
return {
restrict:'E',
template:'< title> {{seo .title}}< / title>'
};
});
当我打开检查器时,指令已移至< body>
并且尚未被模板取代: $ b
如何在头文件中创建指令?
PS:代码示例非常棒!
您的指令不需要去在头部
中设置标题。只需让你的指令注入 $ window
并设置 $ window.document.title ='your title'
。
更新这是您可以如何更新meta标签。 b
$ b
使用像这样的指令:
mmMetaTags。$ inject = ['metaTags'];
函数mmMetaTags(metaTags){
return {
restrict:'A',
link:function(scope,element){
metaTags.metaTags.forEach(function(tag){
addMetaTag(tag.name,tag.content)
});
metaTags.subscribe(addMetaTag);
$ b $ function addMetaTag(name,content){
var tag = element [0] .querySelector('meta [name =''+ name +'''');
if(tag){
tag.setAttribute('content',content);
} else {
element.append('< meta name ='+ name +'content ='+ content +'>');
}
}
}
}
指令('mmMetaTags',mmMetaTags);
除了设置metaTags的服务外:
函数MetaTags(){
// private
this._tags = [];
//私人
this._subscriber;
var self = this;
Object.defineProperty(this,'metaTags',{get:function(){
return self._tags;
}});
MetaTags.prototype.addMetaTag = function(name,content){
this._tags.push({name:name,content:content});
this._updateSubscriber(name,content);
MetaTags.prototype.subscribe = function(callback){
if(!this.subscriber){
this._subscriber = callback;
} else {
throw new Error('Subscriber already attached。只有一个订户可能被添加,因为只能有一个< head>的实例');
}
}
// private
MetaTags.prototype._updateSubscriber = function(name,content){
this.subscriber(name,content) ;
}
服务('metaTags',MetaTags);
因此,在您的头部
属性 mm-meta-tags
。然后在控制器中注入 metaTags
服务并调用 addMetaTag
来更新标签。
I am new to angular.js
. I am trying to create a directive to add some title and meta tags in the <head>
section of html documents, but I am having some trouble.
My index.html
document is as following:
<!DOCTYPE html>
<html ng-app="myApp">
<head>
<meta charset="UTF-8">
<base href="/">
<seo-title></seo-title>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.1/angular.min.js"></script>
<script src="https://code.angularjs.org/1.4.1/angular-route.min.js"></script>
<script src="/incl/js/myApp.js"></script>
</head>
<body >
<div ng-view></div>
</body>
</html>
My javascript is:
var app = angular.module ('myApp', ['ngRoute']);
app.config(['$routeProvider', '$locationProvider', function($routeProvider, $locationProvider) {
$routeProvider
.when('/', { templateUrl: 'routes/home.html'})
.when('/pageA', { templateUrl: 'routes/pageA.html'})
.when('/pageB', { templateUrl: 'routes/pageB.html'})
.otherwise({ redirectTo: '/' });
$locationProvider.html5Mode({
enabled: true
});
}]);
app.directive('seoTitle', function() {
return {
restrict: 'E',
template: '<title>{{seo.title}}</title>'
};
});
When I open the inspector, the directive has been moved to the <body>
and has not been replaced with the template:
How can I create directives in the header?
P.S.: A code example would be great!
Your directive does not need to go in the head
to set the title. Just have your directive inject $window
and set $window.document.title = 'your title'
.
UPDATE This is how you can update meta tags.
For updating meta tags I would use a Directive like this:
mmMetaTags.$inject = ['metaTags'];
function mmMetaTags(metaTags) {
return {
restrict: 'A',
link: function(scope, element) {
metaTags.metaTags.forEach(function(tag) {
addMetaTag(tag.name, tag.content)
});
metaTags.subscribe(addMetaTag);
function addMetaTag(name, content) {
var tag = element[0].querySelector('meta[name="' + name + '"]');
if (tag) {
tag.setAttribute('content', content);
} else {
element.append('<meta name="' + name + '" content="' + content + '">');
}
}
}
}
}
directive('mmMetaTags', mmMetaTags);
Along with a service to set the metaTags:
function MetaTags() {
// private
this._tags = [];
// private
this._subscriber;
var self = this;
Object.defineProperty(this, 'metaTags', { get: function() {
return self._tags;
}});
}
MetaTags.prototype.addMetaTag = function(name, content) {
this._tags.push({ name: name, content: content });
this._updateSubscriber(name, content);
}
MetaTags.prototype.subscribe = function(callback) {
if (!this.subscriber) {
this._subscriber = callback;
} else {
throw new Error('Subscriber already attached. Only one subscriber may be added as there can only be one instance of <head>');
}
}
// private
MetaTags.prototype._updateSubscriber = function(name, content) {
this.subscriber(name, content);
}
service('metaTags', MetaTags);
So in your head
tag you would include the attribute mm-meta-tags
. Then in your controller you would inject the metaTags
service and call addMetaTag
to update the tags.
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