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

edited Nov 16 at 6:58

asked Nov 15 at 11:01

michael

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

add a comment |

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

edited Nov 16 at 6:58

asked Nov 15 at 11:01

michael

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

add a comment |

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

edited Nov 16 at 6:58

asked Nov 15 at 11:01

michael

1,22432346

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

edited Nov 16 at 6:58

asked Nov 15 at 11:01

michael

1,22432346

edited Nov 16 at 6:58

asked Nov 15 at 11:01

michael

1,22432346

edited Nov 16 at 6:58

asked Nov 15 at 11:01

michael

1,22432346

asked Nov 15 at 11:01

michael

1,22432346

asked Nov 15 at 11:01

michael

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

add a comment |

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

add a comment |

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