Angular2 Outputs in ES5?

问题

Here is an example code to demonstrate outputs in Angular 2 using ES5. But I get an TypeError: Cannot read property 'subscribe' of undefined error.

var SampleComponent10 = ng.core.Component({
    selector: "sampleten",
    outputs: ["click"],
    template: ""
}).Class({
    constructor: function(){
        setInterval(function(){
            this.click.next({});
        }.bind(this), 10000)
    }
})

var SampleComponent11 = ng.core.Component({
    selector: "sampleeleven",
    directives: [SampleComponent10],
    template: "<sampleten (click)='clicked($event)'></sampleten>"
}).Class({
    constructor: function(){
        this.clicked = function(e){
            console.log(e);
            console.log("Clicked");
        }
    }
})

Seems like there is some error in the template of SampleComponent11. But I am not able to catch it

回答1:

You need to change your code like this:

var SampleComponent10 = ng.core.Component({
    selector: "sampleten",
    outputs: ["click"],
    template: ""
}).Class({
    constructor: function(){
        this.click = new ng.core.EventEmitter(); <== add this line
        setInterval(function(){
            this.click.next({});
        }.bind(this), 10000)
    }
})

See also https://angular.io/docs/ts/latest/cookbook/ts-to-js.html#!#property-metadata

来源：https://stackoverflow.com/questions/36895505/angular2-outputs-in-es5