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Fixed header moving while scrolling and add sticky footer #11

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Fixed header moving while scrolling and add sticky footer #11

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25 changes: 5 additions & 20 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -299,30 +299,15 @@ export class ListWithApiComponent implements OnChanges {
}
```

## With HTML Table
## Sticky header and footer

*Note* - The `#header` angular selector will make the `<thead>` element fixed to top. If you want the header to scroll out of view don't add the `#header` angular element ref.
*Note* - The `tab-header` angular selector will make the element fixed to top and the `tab-footer` angular selector will make the element fixed to bottom.

```html
<virtual-scroller #scroll [items]="myItems">
<table>
<thead #header>
<th>Index</th>
<th>Name</th>
<th>Gender</th>
<th>Age</th>
<th>Address</th>
</thead>
<tbody #container>
<tr *ngFor="let item of scroll.viewPortItems">
<td>{{item.index}}</td>
<td>{{item.name}}</td>
<td>{{item.gender}}</td>
<td>{{item.age}}</td>
<td>{{item.address}}</td>
</tr>
</tbody>
</table>
<my-custom-header-component tab-header> </my-custom-header-component>
<my-custom-component *ngFor="let item of scroll.viewPortItems"> </my-custom-component>
<my-custom-footer-component tab-footer> </my-custom-footer-component>
</virtual-scroller>
```

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17 changes: 2 additions & 15 deletions projects/ngx-virtual-scroller/src/lib/ngx-virtual-scroller.component.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -95,10 +95,12 @@ export interface IViewport extends IPageInfo {
selector: 'virtual-scroller,[virtualScroller]',
exportAs: 'virtualScroller',
template: `
<ng-content select="[tab-header]"></ng-content>
<div class="total-padding" #invisiblePadding></div>
<div class="scrollable-content" #content>
<ng-content></ng-content>
</div>
<ng-content select="[tab-footer]"></ng-content>
`,
host: {
'[class.horizontal]': 'horizontal',
Expand Down Expand Up @@ -399,9 +401,6 @@ export class VirtualScrollerComponent implements OnInit, OnChanges, OnDestroy {
@ViewChild('invisiblePadding', {read: ElementRef, static: true})
protected invisiblePaddingElementRef: ElementRef;

@ContentChild('header', {read: ElementRef, static: false})
protected headerElementRef: ElementRef;

@ContentChild('container', {read: ElementRef, static: false})
protected containerElementRef: ElementRef;

Expand Down Expand Up @@ -815,14 +814,6 @@ export class VirtualScrollerComponent implements OnInit, OnChanges, OnDestroy {
}
}

if (this.headerElementRef) {
let scrollPosition = this.getScrollElement()[this._scrollType];
let containerOffset = this.getElementsOffset();
let offset = Math.max(scrollPosition - viewport.padding - containerOffset + this.headerElementRef.nativeElement.clientHeight, 0);
this.renderer.setStyle(this.headerElementRef.nativeElement, 'transform', `${this._translateDir}(${offset}px)`);
this.renderer.setStyle(this.headerElementRef.nativeElement, 'webkitTransform', `${this._translateDir}(${offset}px)`);
}

const changeEventArg: IPageInfo = (startChanged || endChanged) ? {
startIndex: viewport.startIndex,
endIndex: viewport.endIndex,
Expand Down Expand Up @@ -1188,10 +1179,6 @@ export class VirtualScrollerComponent implements OnInit, OnChanges, OnDestroy {
scrollLength = numberOfWrapGroups * defaultScrollLengthPerWrapGroup;
}

if (this.headerElementRef) {
scrollLength += this.headerElementRef.nativeElement.clientHeight;
}

let viewportLength = this.horizontal ? viewportWidth : viewportHeight;
let maxScrollPosition = Math.max(scrollLength - viewportLength, 0);

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