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Fixed table header broken when cells have "position: relative" content

See original GitHub issue

When cell content uses position: relative, its painted on top of the fixed header.

For example, when the sample table looks like this:

<virtual-scroller #scroll
      [items]="filteredList">
      <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><div style="position: relative; color: red; font-weight: bold">{{item.index}}</div></td>
			  <td><div style="position: relative; color: red; font-weight: bold">{{item.name}}</div></td>
			  <td><div style="position: relative; color: red; font-weight: bold">{{item.gender}}</div></td>
			  <td><div style="position: relative; color: red; font-weight: bold">{{item.age}}</div></td>
			  <td><div style="position: relative; color: red; font-weight: bold">{{item.address}}</div></td>
			</tr>
		  </tbody>
      </table>
    </virtual-scroller>

… then it’s rendered like:

Issue Analytics

State:
Created 5 years ago
Reactions:1
Comments:10

Top GitHub Comments

3reactions

natelokerscommented, Dec 10, 2018

I’m still trying to validate this in other browsers, but it seems like swapping the thead and the tbody in the HTML fixes this issue.

<virtual-scroller #scroll
      [items]="filteredList">
      <table>
		<tbody #container>
			<tr *ngFor="let item of scroll.viewPortItems">
			  <td><div style="position: relative; color: red; font-weight: bold">{{item.index}}</div></td>
			  <td><div style="position: relative; color: red; font-weight: bold">{{item.name}}</div></td>
			  <td><div style="position: relative; color: red; font-weight: bold">{{item.gender}}</div></td>
			  <td><div style="position: relative; color: red; font-weight: bold">{{item.age}}</div></td>
			  <td><div style="position: relative; color: red; font-weight: bold">{{item.address}}</div></td>
			</tr>
		  </tbody>
                  <thead #header>
			<th>Index</th>
			<th>Name</th>
			<th>Gender</th>
			<th>Age</th>
			<th>Address</th>
		</thead>
      </table>
    </virtual-scroller>

0reactions

markhbrowncommented, Dec 14, 2020

The problem is still in version 4.0.3.

But does work with the suggestion by @natelokers.