Angular2 http request in interval
I'm trying to make a request every 3 seconds and print the response, but so far no luck :(. I'm new to Observables
, so what am I doing wrong?
checkConnection() {
const URL = "https://www.google.at/";
Observable.interval(3000)
.flatMap(() => this.http.get(URL).map(res => res.json()).catch((error:any) => Observable.throw(error.json().error || 'Server error'))
.subscribe(data => {
console.log(data)
})
)
}
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1 answer
You need subscribe
to Observable
, which comes from the answer flatMap
like this:
Observable.interval(3000)
.flatMap(() => this.http.get(URL)
.map( res => res.json() )
.catch( (error:any) => Observable.throw(error.json().error || 'Server error') ) )
.subscribe(data => {
console.log(data)
})
And https://www.google.at/
cross-domain requests need to be enabled so you can get the data.
An example plunker you can work on: http://plnkr.co/edit/Nz0LZJDSPcUZlYOHU3p7?p=preview
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