Scroll to specific Expansion Panel in Material Accordion after Component loaded

We are trying to scroll to a specific <mat-expansion-panel> item within a <mat-accordion>. The problem is that ngAfterViewInit() is triggered before the accordion and its panels are fully loaded. This means the scrollIntoView() function is called while the accordions are being loaded and the page size afterwards change making our scroll operation take us to the wrong position of the page.

We also tried the other lifecycle hooks, which did not help, since they're all called to early. Does somebody have any good practice for this issue?

Our source is simple since we are trying to implement something very basic:

landingpage.component.html

<mat-accordion>

   <mat-expansion-panel id="pangel-1">

    <mat-expansion-panel-header>

      <mat-panel-title>Lorem ipsum</mat-panel-title>

    </mat-expansion-panel-header>

    <p>

      Lorem ipsum dolor sit amet,

      consetetur sadipscing elitr,

      sed diam nonumy eirmod tempor invidunt...

    </p>

  </mat-expansion-panel>

  <mat-expansion-panel id="panel-2">

    <mat-expansion-panel-header>

      <mat-panel-title>Lorem ipsum</mat-panel-title>

    </mat-expansion-panel-header>

    <p>

      Lorem ipsum dolor sit amet,

      consetetur sadipscing elitr,

      sed diam nonumy eirmod tempor invidunt...

    </p>

  </mat-expansion-panel> 



  [ ... ] // more panels



</mat-accordion>

landingpage.component.ts

ngAfterViewInit() {

  this.scroll("panel-1");

}



scroll(id) {

  console.log(`scrolling to ${id}`);

  let el = document.getElementById(id);

  el.scrollIntoView();

}

edited Nov 15 '18 at 14:02

asked Nov 13 '18 at 11:01

Entertain

198523

1

Please share some example code and template so that we can understand the structure of your app. A stackblitz example would be ideal.

– G. Tranter
Nov 13 '18 at 22:15

@G.Tranter Question was updated

– Entertain
Nov 15 '18 at 14:03

add a comment |

We also tried the other lifecycle hooks, which did not help, since they're all called to early. Does somebody have any good practice for this issue?

Our source is simple since we are trying to implement something very basic:

landingpage.component.html

<mat-accordion>

   <mat-expansion-panel id="pangel-1">

    <mat-expansion-panel-header>

      <mat-panel-title>Lorem ipsum</mat-panel-title>

    </mat-expansion-panel-header>

    <p>

      Lorem ipsum dolor sit amet,

      consetetur sadipscing elitr,

      sed diam nonumy eirmod tempor invidunt...

    </p>

  </mat-expansion-panel>

  <mat-expansion-panel id="panel-2">

    <mat-expansion-panel-header>

      <mat-panel-title>Lorem ipsum</mat-panel-title>

    </mat-expansion-panel-header>

    <p>

      Lorem ipsum dolor sit amet,

      consetetur sadipscing elitr,

      sed diam nonumy eirmod tempor invidunt...

    </p>

  </mat-expansion-panel> 



  [ ... ] // more panels



</mat-accordion>

landingpage.component.ts

ngAfterViewInit() {

  this.scroll("panel-1");

}



scroll(id) {

  console.log(`scrolling to ${id}`);

  let el = document.getElementById(id);

  el.scrollIntoView();

}

edited Nov 15 '18 at 14:02

asked Nov 13 '18 at 11:01

Entertain

198523

1

Please share some example code and template so that we can understand the structure of your app. A stackblitz example would be ideal.

– G. Tranter
Nov 13 '18 at 22:15

@G.Tranter Question was updated

– Entertain
Nov 15 '18 at 14:03

add a comment |

We also tried the other lifecycle hooks, which did not help, since they're all called to early. Does somebody have any good practice for this issue?

Our source is simple since we are trying to implement something very basic:

landingpage.component.html

<mat-accordion>

   <mat-expansion-panel id="pangel-1">

    <mat-expansion-panel-header>

      <mat-panel-title>Lorem ipsum</mat-panel-title>

    </mat-expansion-panel-header>

    <p>

      Lorem ipsum dolor sit amet,

      consetetur sadipscing elitr,

      sed diam nonumy eirmod tempor invidunt...

    </p>

  </mat-expansion-panel>

  <mat-expansion-panel id="panel-2">

    <mat-expansion-panel-header>

      <mat-panel-title>Lorem ipsum</mat-panel-title>

    </mat-expansion-panel-header>

    <p>

      Lorem ipsum dolor sit amet,

      consetetur sadipscing elitr,

      sed diam nonumy eirmod tempor invidunt...

    </p>

  </mat-expansion-panel> 



  [ ... ] // more panels



</mat-accordion>

landingpage.component.ts

ngAfterViewInit() {

  this.scroll("panel-1");

}



scroll(id) {

  console.log(`scrolling to ${id}`);

  let el = document.getElementById(id);

  el.scrollIntoView();

}

edited Nov 15 '18 at 14:02

asked Nov 13 '18 at 11:01

Entertain

198523

We also tried the other lifecycle hooks, which did not help, since they're all called to early. Does somebody have any good practice for this issue?

Our source is simple since we are trying to implement something very basic:

landingpage.component.html

<mat-accordion>

   <mat-expansion-panel id="pangel-1">

    <mat-expansion-panel-header>

      <mat-panel-title>Lorem ipsum</mat-panel-title>

    </mat-expansion-panel-header>

    <p>

      Lorem ipsum dolor sit amet,

      consetetur sadipscing elitr,

      sed diam nonumy eirmod tempor invidunt...

    </p>

  </mat-expansion-panel>

  <mat-expansion-panel id="panel-2">

    <mat-expansion-panel-header>

      <mat-panel-title>Lorem ipsum</mat-panel-title>

    </mat-expansion-panel-header>

    <p>

      Lorem ipsum dolor sit amet,

      consetetur sadipscing elitr,

      sed diam nonumy eirmod tempor invidunt...

    </p>

  </mat-expansion-panel> 



  [ ... ] // more panels



</mat-accordion>

landingpage.component.ts

ngAfterViewInit() {

  this.scroll("panel-1");

}



scroll(id) {

  console.log(`scrolling to ${id}`);

  let el = document.getElementById(id);

  el.scrollIntoView();

}

angular typescript angular-material

edited Nov 15 '18 at 14:02

asked Nov 13 '18 at 11:01

Entertain

198523

edited Nov 15 '18 at 14:02

asked Nov 13 '18 at 11:01

Entertain

198523

edited Nov 15 '18 at 14:02

asked Nov 13 '18 at 11:01

Entertain

198523

asked Nov 13 '18 at 11:01

Entertain

198523

asked Nov 13 '18 at 11:01

Entertain

198523

1

Please share some example code and template so that we can understand the structure of your app. A stackblitz example would be ideal.

– G. Tranter
Nov 13 '18 at 22:15

@G.Tranter Question was updated

– Entertain
Nov 15 '18 at 14:03

add a comment |

1

Please share some example code and template so that we can understand the structure of your app. A stackblitz example would be ideal.

– G. Tranter
Nov 13 '18 at 22:15

@G.Tranter Question was updated

– Entertain
Nov 15 '18 at 14:03

Please share some example code and template so that we can understand the structure of your app. A stackblitz example would be ideal.

– G. Tranter
Nov 13 '18 at 22:15

@G.Tranter Question was updated

– Entertain
Nov 15 '18 at 14:03

add a comment |

2 Answers
2

active

oldest

votes

Here is an example on StackBlitz with Angular Material 7. Your technique works fine, but you need to be careful about a couple of things - make sure that the page is long enough so that the panel can be positioned at the top of the page, and make sure you don't misspell the panel's id.

answered Nov 21 '18 at 16:37

G. Tranter

4,4311423

Unfortunatly I misclicked and assigned the bounty to the wrong answer, im sorry - it was quite a long work day. This is the correct answer though for providing evidence that the given snippets are actually working. Our component is quite large so it seems that the problem lays somewhere else and I will have to double check.

– Entertain
Nov 21 '18 at 17:31

add a comment |

+50

In my example i click something and it opens a side nav that takes up half the screen, so on the click function i have this logic:

if ($event) {

    setTimeout(() => $event.target.scrollIntoView({behavior: 'smooth', block: 'end'}), 1);

}

So in your example you could tie to the afterExpand event (on mat-expansion-panel) and run the logic.

answered Nov 15 '18 at 14:15

Tim.Burnell

1515

add a comment |

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2 Answers
2

active

oldest

votes

2 Answers
2

active

oldest

votes

answered Nov 21 '18 at 16:37

G. Tranter

4,4311423

Unfortunatly I misclicked and assigned the bounty to the wrong answer, im sorry - it was quite a long work day. This is the correct answer though for providing evidence that the given snippets are actually working. Our component is quite large so it seems that the problem lays somewhere else and I will have to double check.

– Entertain
Nov 21 '18 at 17:31

add a comment |

answered Nov 21 '18 at 16:37

G. Tranter

4,4311423

Unfortunatly I misclicked and assigned the bounty to the wrong answer, im sorry - it was quite a long work day. This is the correct answer though for providing evidence that the given snippets are actually working. Our component is quite large so it seems that the problem lays somewhere else and I will have to double check.

– Entertain
Nov 21 '18 at 17:31

add a comment |

answered Nov 21 '18 at 16:37

G. Tranter

4,4311423

answered Nov 21 '18 at 16:37

G. Tranter

4,4311423

answered Nov 21 '18 at 16:37

G. Tranter

4,4311423

answered Nov 21 '18 at 16:37

G. Tranter

4,4311423

answered Nov 21 '18 at 16:37

G. Tranter

4,4311423

Unfortunatly I misclicked and assigned the bounty to the wrong answer, im sorry - it was quite a long work day. This is the correct answer though for providing evidence that the given snippets are actually working. Our component is quite large so it seems that the problem lays somewhere else and I will have to double check.

– Entertain
Nov 21 '18 at 17:31

add a comment |

Unfortunatly I misclicked and assigned the bounty to the wrong answer, im sorry - it was quite a long work day. This is the correct answer though for providing evidence that the given snippets are actually working. Our component is quite large so it seems that the problem lays somewhere else and I will have to double check.

– Entertain
Nov 21 '18 at 17:31

Unfortunatly I misclicked and assigned the bounty to the wrong answer, im sorry - it was quite a long work day. This is the correct answer though for providing evidence that the given snippets are actually working. Our component is quite large so it seems that the problem lays somewhere else and I will have to double check.

– Entertain
Nov 21 '18 at 17:31

add a comment |

+50

In my example i click something and it opens a side nav that takes up half the screen, so on the click function i have this logic:

if ($event) {

    setTimeout(() => $event.target.scrollIntoView({behavior: 'smooth', block: 'end'}), 1);

}

So in your example you could tie to the afterExpand event (on mat-expansion-panel) and run the logic.

answered Nov 15 '18 at 14:15

Tim.Burnell

1515

add a comment |

+50

In my example i click something and it opens a side nav that takes up half the screen, so on the click function i have this logic:

if ($event) {

    setTimeout(() => $event.target.scrollIntoView({behavior: 'smooth', block: 'end'}), 1);

}

So in your example you could tie to the afterExpand event (on mat-expansion-panel) and run the logic.

answered Nov 15 '18 at 14:15

Tim.Burnell

1515

add a comment |

+50

In my example i click something and it opens a side nav that takes up half the screen, so on the click function i have this logic:

if ($event) {

    setTimeout(() => $event.target.scrollIntoView({behavior: 'smooth', block: 'end'}), 1);

}

So in your example you could tie to the afterExpand event (on mat-expansion-panel) and run the logic.

answered Nov 15 '18 at 14:15

Tim.Burnell

1515

In my example i click something and it opens a side nav that takes up half the screen, so on the click function i have this logic:

if ($event) {

    setTimeout(() => $event.target.scrollIntoView({behavior: 'smooth', block: 'end'}), 1);

}

So in your example you could tie to the afterExpand event (on mat-expansion-panel) and run the logic.

answered Nov 15 '18 at 14:15

Tim.Burnell

1515

answered Nov 15 '18 at 14:15

Tim.Burnell

1515

answered Nov 15 '18 at 14:15

Tim.Burnell

1515

answered Nov 15 '18 at 14:15

Tim.Burnell

1515

add a comment |

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