Angular 6 track scroll position of div within div
I am trying to create a directive that tracks the Y position of the element it is placed on - when this element reaches the top of the parent div, I will add sticky styling to make the header stick to the top until the whole element has been scrolled.
I have tried to track the scrolling, but can't get any output apart from the initial ngoninit log:
import { Directive, OnInit, ElementRef, HostBinding, HostListener } from '@angular/core';
@Directive({
/* tslint:disable-next-line:directive-selector */
selector: '[stickyHeaderDirective]'
})
export class StickyHeaderDirective implements OnInit {
ngOnInit() {
console.log('lets track ths scroll');
}
constructor() {}
@HostListener('scroll', ['$event']) private onScroll($event: Event): void {
console.log($event.srcElement.scrollLeft, $event.srcElement.scrollTop);
}
}
What am i missing?
angular scroll angular2-directives asked Nov 15 '18 at 14:12
user3024827user3024827
309420
add a comment |
I am trying to create a directive that tracks the Y position of the element it is placed on - when this element reaches the top of the parent div, I will add sticky styling to make the header stick to the top until the whole element has been scrolled.
I have tried to track the scrolling, but can't get any output apart from the initial ngoninit log:
import { Directive, OnInit, ElementRef, HostBinding, HostListener } from '@angular/core';
@Directive({
/* tslint:disable-next-line:directive-selector */
selector: '[stickyHeaderDirective]'
})
export class StickyHeaderDirective implements OnInit {
ngOnInit() {
console.log('lets track ths scroll');
}
constructor() {}
@HostListener('scroll', ['$event']) private onScroll($event: Event): void {
console.log($event.srcElement.scrollLeft, $event.srcElement.scrollTop);
}
}
What am i missing?
angular scroll angular2-directives asked Nov 15 '18 at 14:12
user3024827user3024827
309420
add a comment |
I am trying to create a directive that tracks the Y position of the element it is placed on - when this element reaches the top of the parent div, I will add sticky styling to make the header stick to the top until the whole element has been scrolled.
I have tried to track the scrolling, but can't get any output apart from the initial ngoninit log:
import { Directive, OnInit, ElementRef, HostBinding, HostListener } from '@angular/core';
@Directive({
/* tslint:disable-next-line:directive-selector */
selector: '[stickyHeaderDirective]'
})
export class StickyHeaderDirective implements OnInit {
ngOnInit() {
console.log('lets track ths scroll');
}
constructor() {}
@HostListener('scroll', ['$event']) private onScroll($event: Event): void {
console.log($event.srcElement.scrollLeft, $event.srcElement.scrollTop);
}
}
What am i missing?
angular scroll angular2-directives asked Nov 15 '18 at 14:12
user3024827user3024827
309420
I am trying to create a directive that tracks the Y position of the element it is placed on - when this element reaches the top of the parent div, I will add sticky styling to make the header stick to the top until the whole element has been scrolled.
I have tried to track the scrolling, but can't get any output apart from the initial ngoninit log:
import { Directive, OnInit, ElementRef, HostBinding, HostListener } from '@angular/core';
@Directive({
/* tslint:disable-next-line:directive-selector */
selector: '[stickyHeaderDirective]'
})
export class StickyHeaderDirective implements OnInit {
ngOnInit() {
console.log('lets track ths scroll');
}
constructor() {}
@HostListener('scroll', ['$event']) private onScroll($event: Event): void {
console.log($event.srcElement.scrollLeft, $event.srcElement.scrollTop);
}
}
What am i missing?
angular scroll angular2-directives angular scroll angular2-directives asked Nov 15 '18 at 14:12
user3024827user3024827
309420
asked Nov 15 '18 at 14:12
user3024827user3024827
309420
asked Nov 15 '18 at 14:12
user3024827user3024827
309420
asked Nov 15 '18 at 14:12
user3024827user3024827
309420
asked Nov 15 '18 at 14:12
user3024827user3024827
309420
309420
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
HostListener only listens for scroll events which occur on the [stickyHeaderDirective] element. That element must be the one firing the scroll events.
Make sure the [stickyHeaderDirective] element has the correct CSS styling to allow it to scroll. Here's a demo showing the difference with and without CSS styles.
for (let element of document.getElementsByClassName('track-scrolling')) {
element.addEventListener('scroll', e => {
console.log(e.srcElement.scrollLeft, e.srcElement.scrollTop);
});
}.container {
height: 200px;
width: 200px;
overflow: auto;
margin: 10px;
border: 1px solid;
}
.big-content {
height: 1000px;
width: 1000px;
}
.track-scrolling.wrong {
/*
No overflow property
No height/width or max-height/width
*/
color: red;
}
.track-scrolling.right {
overflow: auto;
max-height: 100%;
color: green;
}<div class="container">
<div class="track-scrolling wrong">
I won't fire scroll events
<div class="big-content"></div>
</div>
</div>
<div class="container">
<div class="track-scrolling right">
I will fire scroll events
<div class="big-content"></div>
</div>
</div>And here's a demo showing the same behavior with your directive: https://stackblitz.com/edit/angular-kqvraz
answered Nov 15 '18 at 15:06
Alex KAlex K
1,195610
Fantastic - thank you for such a detailed answer! much help
– user3024827
Nov 15 '18 at 18:20
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
HostListener only listens for scroll events which occur on the [stickyHeaderDirective] element. That element must be the one firing the scroll events.
Make sure the [stickyHeaderDirective] element has the correct CSS styling to allow it to scroll. Here's a demo showing the difference with and without CSS styles.
for (let element of document.getElementsByClassName('track-scrolling')) {
element.addEventListener('scroll', e => {
console.log(e.srcElement.scrollLeft, e.srcElement.scrollTop);
});
}.container {
height: 200px;
width: 200px;
overflow: auto;
margin: 10px;
border: 1px solid;
}
.big-content {
height: 1000px;
width: 1000px;
}
.track-scrolling.wrong {
/*
No overflow property
No height/width or max-height/width
*/
color: red;
}
.track-scrolling.right {
overflow: auto;
max-height: 100%;
color: green;
}<div class="container">
<div class="track-scrolling wrong">
I won't fire scroll events
<div class="big-content"></div>
</div>
</div>
<div class="container">
<div class="track-scrolling right">
I will fire scroll events
<div class="big-content"></div>
</div>
</div>And here's a demo showing the same behavior with your directive: https://stackblitz.com/edit/angular-kqvraz
answered Nov 15 '18 at 15:06
Alex KAlex K
1,195610
Fantastic - thank you for such a detailed answer! much help
– user3024827
Nov 15 '18 at 18:20
add a comment |
HostListener only listens for scroll events which occur on the [stickyHeaderDirective] element. That element must be the one firing the scroll events.
Make sure the [stickyHeaderDirective] element has the correct CSS styling to allow it to scroll. Here's a demo showing the difference with and without CSS styles.
for (let element of document.getElementsByClassName('track-scrolling')) {
element.addEventListener('scroll', e => {
console.log(e.srcElement.scrollLeft, e.srcElement.scrollTop);
});
}.container {
height: 200px;
width: 200px;
overflow: auto;
margin: 10px;
border: 1px solid;
}
.big-content {
height: 1000px;
width: 1000px;
}
.track-scrolling.wrong {
/*
No overflow property
No height/width or max-height/width
*/
color: red;
}
.track-scrolling.right {
overflow: auto;
max-height: 100%;
color: green;
}<div class="container">
<div class="track-scrolling wrong">
I won't fire scroll events
<div class="big-content"></div>
</div>
</div>
<div class="container">
<div class="track-scrolling right">
I will fire scroll events
<div class="big-content"></div>
</div>
</div>And here's a demo showing the same behavior with your directive: https://stackblitz.com/edit/angular-kqvraz
answered Nov 15 '18 at 15:06
Alex KAlex K
1,195610
Fantastic - thank you for such a detailed answer! much help
– user3024827
Nov 15 '18 at 18:20
add a comment |
HostListener only listens for scroll events which occur on the [stickyHeaderDirective] element. That element must be the one firing the scroll events.
Make sure the [stickyHeaderDirective] element has the correct CSS styling to allow it to scroll. Here's a demo showing the difference with and without CSS styles.
for (let element of document.getElementsByClassName('track-scrolling')) {
element.addEventListener('scroll', e => {
console.log(e.srcElement.scrollLeft, e.srcElement.scrollTop);
});
}.container {
height: 200px;
width: 200px;
overflow: auto;
margin: 10px;
border: 1px solid;
}
.big-content {
height: 1000px;
width: 1000px;
}
.track-scrolling.wrong {
/*
No overflow property
No height/width or max-height/width
*/
color: red;
}
.track-scrolling.right {
overflow: auto;
max-height: 100%;
color: green;
}<div class="container">
<div class="track-scrolling wrong">
I won't fire scroll events
<div class="big-content"></div>
</div>
</div>
<div class="container">
<div class="track-scrolling right">
I will fire scroll events
<div class="big-content"></div>
</div>
</div>And here's a demo showing the same behavior with your directive: https://stackblitz.com/edit/angular-kqvraz
answered Nov 15 '18 at 15:06
Alex KAlex K
1,195610
HostListener only listens for scroll events which occur on the [stickyHeaderDirective] element. That element must be the one firing the scroll events.
Make sure the [stickyHeaderDirective] element has the correct CSS styling to allow it to scroll. Here's a demo showing the difference with and without CSS styles.
for (let element of document.getElementsByClassName('track-scrolling')) {
element.addEventListener('scroll', e => {
console.log(e.srcElement.scrollLeft, e.srcElement.scrollTop);
});
}.container {
height: 200px;
width: 200px;
overflow: auto;
margin: 10px;
border: 1px solid;
}
.big-content {
height: 1000px;
width: 1000px;
}
.track-scrolling.wrong {
/*
No overflow property
No height/width or max-height/width
*/
color: red;
}
.track-scrolling.right {
overflow: auto;
max-height: 100%;
color: green;
}<div class="container">
<div class="track-scrolling wrong">
I won't fire scroll events
<div class="big-content"></div>
</div>
</div>
<div class="container">
<div class="track-scrolling right">
I will fire scroll events
<div class="big-content"></div>
</div>
</div>And here's a demo showing the same behavior with your directive: https://stackblitz.com/edit/angular-kqvraz
for (let element of document.getElementsByClassName('track-scrolling')) {
element.addEventListener('scroll', e => {
console.log(e.srcElement.scrollLeft, e.srcElement.scrollTop);
});
}.container {
height: 200px;
width: 200px;
overflow: auto;
margin: 10px;
border: 1px solid;
}
.big-content {
height: 1000px;
width: 1000px;
}
.track-scrolling.wrong {
/*
No overflow property
No height/width or max-height/width
*/
color: red;
}
.track-scrolling.right {
overflow: auto;
max-height: 100%;
color: green;
}<div class="container">
<div class="track-scrolling wrong">
I won't fire scroll events
<div class="big-content"></div>
</div>
</div>
<div class="container">
<div class="track-scrolling right">
I will fire scroll events
<div class="big-content"></div>
</div>
</div>for (let element of document.getElementsByClassName('track-scrolling')) {
element.addEventListener('scroll', e => {
console.log(e.srcElement.scrollLeft, e.srcElement.scrollTop);
});
}.container {
height: 200px;
width: 200px;
overflow: auto;
margin: 10px;
border: 1px solid;
}
.big-content {
height: 1000px;
width: 1000px;
}
.track-scrolling.wrong {
/*
No overflow property
No height/width or max-height/width
*/
color: red;
}
.track-scrolling.right {
overflow: auto;
max-height: 100%;
color: green;
}<div class="container">
<div class="track-scrolling wrong">
I won't fire scroll events
<div class="big-content"></div>
</div>
</div>
<div class="container">
<div class="track-scrolling right">
I will fire scroll events
<div class="big-content"></div>
</div>
</div>answered Nov 15 '18 at 15:06
Alex KAlex K
1,195610
edited Nov 15 '18 at 15:15
answered Nov 15 '18 at 15:06
Alex KAlex K
1,195610
answered Nov 15 '18 at 15:06
Alex KAlex K
1,195610
answered Nov 15 '18 at 15:06
Alex KAlex K
1,195610
1,195610
Fantastic - thank you for such a detailed answer! much help
– user3024827
Nov 15 '18 at 18:20
add a comment |
Fantastic - thank you for such a detailed answer! much help
– user3024827
Nov 15 '18 at 18:20
Fantastic - thank you for such a detailed answer! much help
– user3024827
Nov 15 '18 at 18:20
Fantastic - thank you for such a detailed answer! much help
– user3024827
Nov 15 '18 at 18:20
add a comment |
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