Angular6: Why is `ActivatedRoute.snapshot.queryParams` empty when the url clearly shows correct value?











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from one page, I call:



// call this to nav to '/list' with queryParams 
const data = {'map-center': this.loc.join(',')};
this.router.navigate(['/list'], {queryParams:data} );


which produces the correct navigation event with this url:



http://localhost:8100/list?map-center=13.7414025,100.51102500000002



but in the target page, queryParam is empty in both cases:



// <ion-router-outlet main
// (activate)="!!$event.viewWillEnter ? $event.viewWillEnter() : undefined"

viewWillEnter(){
// using constructor(){ private route: ActivatedRoute }
const mapCenter = this.route.snapshot.queryParams['map-center'];
this.route.queryParams.subscribe(p=>console.log(">>> queryParams=", p))
}


however, queryParam is fine when I reload from the browser. what's happening?



[update] if I add a param to the url, queryParams works fine.



this.router.navigate(['/list',{a:1}], {queryParams:data} );
// http://localhost:8100/list;a=1?map-center=13.7414025,100.51102500000002









share|improve this question
























  • Try this.route.queryParams.subscribe(params =>console.log(params['map-center']))
    – Arcteezy
    Nov 15 at 11:10










  • It's the same. I get params=={}
    – michael
    Nov 15 at 11:16










  • Yes. But I'm returning to the route, so it should already be loaded, right?
    – michael
    Nov 15 at 15:19










  • Technically yes. And it worked for me.
    – Arcteezy
    Nov 16 at 6:31










  • adding a param to the the route makes queryParams work fine. e.g. this.router.navigate(['/list',{a:1}], {queryParams:data} );
    – michael
    Nov 16 at 6:59















up vote
0
down vote

favorite












from one page, I call:



// call this to nav to '/list' with queryParams 
const data = {'map-center': this.loc.join(',')};
this.router.navigate(['/list'], {queryParams:data} );


which produces the correct navigation event with this url:



http://localhost:8100/list?map-center=13.7414025,100.51102500000002



but in the target page, queryParam is empty in both cases:



// <ion-router-outlet main
// (activate)="!!$event.viewWillEnter ? $event.viewWillEnter() : undefined"

viewWillEnter(){
// using constructor(){ private route: ActivatedRoute }
const mapCenter = this.route.snapshot.queryParams['map-center'];
this.route.queryParams.subscribe(p=>console.log(">>> queryParams=", p))
}


however, queryParam is fine when I reload from the browser. what's happening?



[update] if I add a param to the url, queryParams works fine.



this.router.navigate(['/list',{a:1}], {queryParams:data} );
// http://localhost:8100/list;a=1?map-center=13.7414025,100.51102500000002









share|improve this question
























  • Try this.route.queryParams.subscribe(params =>console.log(params['map-center']))
    – Arcteezy
    Nov 15 at 11:10










  • It's the same. I get params=={}
    – michael
    Nov 15 at 11:16










  • Yes. But I'm returning to the route, so it should already be loaded, right?
    – michael
    Nov 15 at 15:19










  • Technically yes. And it worked for me.
    – Arcteezy
    Nov 16 at 6:31










  • adding a param to the the route makes queryParams work fine. e.g. this.router.navigate(['/list',{a:1}], {queryParams:data} );
    – michael
    Nov 16 at 6:59













up vote
0
down vote

favorite









up vote
0
down vote

favorite











from one page, I call:



// call this to nav to '/list' with queryParams 
const data = {'map-center': this.loc.join(',')};
this.router.navigate(['/list'], {queryParams:data} );


which produces the correct navigation event with this url:



http://localhost:8100/list?map-center=13.7414025,100.51102500000002



but in the target page, queryParam is empty in both cases:



// <ion-router-outlet main
// (activate)="!!$event.viewWillEnter ? $event.viewWillEnter() : undefined"

viewWillEnter(){
// using constructor(){ private route: ActivatedRoute }
const mapCenter = this.route.snapshot.queryParams['map-center'];
this.route.queryParams.subscribe(p=>console.log(">>> queryParams=", p))
}


however, queryParam is fine when I reload from the browser. what's happening?



[update] if I add a param to the url, queryParams works fine.



this.router.navigate(['/list',{a:1}], {queryParams:data} );
// http://localhost:8100/list;a=1?map-center=13.7414025,100.51102500000002









share|improve this question















from one page, I call:



// call this to nav to '/list' with queryParams 
const data = {'map-center': this.loc.join(',')};
this.router.navigate(['/list'], {queryParams:data} );


which produces the correct navigation event with this url:



http://localhost:8100/list?map-center=13.7414025,100.51102500000002



but in the target page, queryParam is empty in both cases:



// <ion-router-outlet main
// (activate)="!!$event.viewWillEnter ? $event.viewWillEnter() : undefined"

viewWillEnter(){
// using constructor(){ private route: ActivatedRoute }
const mapCenter = this.route.snapshot.queryParams['map-center'];
this.route.queryParams.subscribe(p=>console.log(">>> queryParams=", p))
}


however, queryParam is fine when I reload from the browser. what's happening?



[update] if I add a param to the url, queryParams works fine.



this.router.navigate(['/list',{a:1}], {queryParams:data} );
// http://localhost:8100/list;a=1?map-center=13.7414025,100.51102500000002






javascript angular ionic-framework angular6






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edited Nov 16 at 6:58

























asked Nov 15 at 11:01









michael

1,22432346




1,22432346












  • Try this.route.queryParams.subscribe(params =>console.log(params['map-center']))
    – Arcteezy
    Nov 15 at 11:10










  • It's the same. I get params=={}
    – michael
    Nov 15 at 11:16










  • Yes. But I'm returning to the route, so it should already be loaded, right?
    – michael
    Nov 15 at 15:19










  • Technically yes. And it worked for me.
    – Arcteezy
    Nov 16 at 6:31










  • adding a param to the the route makes queryParams work fine. e.g. this.router.navigate(['/list',{a:1}], {queryParams:data} );
    – michael
    Nov 16 at 6:59


















  • Try this.route.queryParams.subscribe(params =>console.log(params['map-center']))
    – Arcteezy
    Nov 15 at 11:10










  • It's the same. I get params=={}
    – michael
    Nov 15 at 11:16










  • Yes. But I'm returning to the route, so it should already be loaded, right?
    – michael
    Nov 15 at 15:19










  • Technically yes. And it worked for me.
    – Arcteezy
    Nov 16 at 6:31










  • adding a param to the the route makes queryParams work fine. e.g. this.router.navigate(['/list',{a:1}], {queryParams:data} );
    – michael
    Nov 16 at 6:59
















Try this.route.queryParams.subscribe(params =>console.log(params['map-center']))
– Arcteezy
Nov 15 at 11:10




Try this.route.queryParams.subscribe(params =>console.log(params['map-center']))
– Arcteezy
Nov 15 at 11:10












It's the same. I get params=={}
– michael
Nov 15 at 11:16




It's the same. I get params=={}
– michael
Nov 15 at 11:16












Yes. But I'm returning to the route, so it should already be loaded, right?
– michael
Nov 15 at 15:19




Yes. But I'm returning to the route, so it should already be loaded, right?
– michael
Nov 15 at 15:19












Technically yes. And it worked for me.
– Arcteezy
Nov 16 at 6:31




Technically yes. And it worked for me.
– Arcteezy
Nov 16 at 6:31












adding a param to the the route makes queryParams work fine. e.g. this.router.navigate(['/list',{a:1}], {queryParams:data} );
– michael
Nov 16 at 6:59




adding a param to the the route makes queryParams work fine. e.g. this.router.navigate(['/list',{a:1}], {queryParams:data} );
– michael
Nov 16 at 6:59

















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