角度指令:サービスなしでコントローラへのリンク
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20-12-2019 - |
質問
徐々に釣り指令を吊り下げて、これまでのところ、コントローラ間の仲介者としてのサービスの作成に頼っています。
私は疑問に思っていましたが、ディレクティブ(およびリンク機能)の文脈では、リンク関数からの変数へのコントローラアクセスを与えることが可能ですか?(サービスやグローバル変数がない)
module.exports = function() {
return {
restrict: 'A',
templateUrl: 'partials/collection',
link: function(scope, element, attrs) {
var name = attrs.collectionName;
// from here
},
controller: function($scope, socket) {
$scope.models = [];
// to here
socket.on('ready', function() {
socket.emit(name + '/get');
});
}
}
};
.
コレクション名属性の値をコントローラ内で利用できるようにしたいので、適切なソケット呼び出しを行うことができます。任意のアイデア?
解決
彼らは同じ範囲を共有するので、これはうまくいくべきです。
module.exports = function() {
return {
restrict: 'A',
templateUrl: 'partials/collection',
link: function(scope, element, attrs) {
scope.name = attrs.collectionName;
// from here
},
controller: function($scope, socket) {
$scope.models = [];
// to here
socket.on('ready', function() {
socket.emit($scope.name + '/get');
});
}
}
};
. 他のヒント
コントローラにメソッドを追加し、それをリンク関数から呼び出します。
controller: function($scope, socket) {
this.setSocket = function(name){
{...}
}
}
.
リンク:
link: function(scope, element, attrs, controller){
var name = attrs.collectionName;
controller.setSocket(name);
}
. There are a couple of ways of doing what you want
Just put everything in the link function. You can set functions and variables on the scope just like you might put in a controller.
Just put everything in the controller, in terms of setting scope variables or functions. It is injected with
$attrs
, which contains the normalised attribute values, so you have access to the attributes if you need them.
As far as I know, in most cases it doesn't make a difference where you assign variables or functions on the scope. The main difference between the two is that if you want to give your directive a public API, so other directives can communicate to it via require
, then you must use this.something
in the controller.
There maybe a better way to do it, but I've managed to get around the problem by changing my controller functions dependencies to include an $element argument. Then just used jqLite to get the value of the attribute in question.
controller: function($scope, $element, socket) {
var name = $element.attr('collection-name');
}
It's not fantastically elegant, but it works.