WAI-ARIA: aria-colcount (Property)
Description
Defines the total number of columns in a table, grid, or treegrid. See related aria-colindex.
If all of the columns are present in the DOM, it is not necessary to set this attribute as the user agent can automatically calculate the total number of columns. However, if only a portion of the columns is present in the DOM at a given moment, this attribute is needed to provide an explicit indication of the number of columns in the full table.
Authors MUST set the value of aria-colcount to an integer equal to the number of columns in the full table. If the total number of columns is unknown, authors MUST set the value of aria-colcount to -1 to indicate that the value should not be calculated by the user agent.
Browser Compatibility For aria-colcount
| desktop | mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
ariaColCount | ChromeFull support81 | EdgeFull support81 | FirefoxNo supportNo | Internet ExplorerNo supportNo | OperaFull support68 | SafariFull support12.1 | WebView AndroidFull support81 | Chrome AndroidFull support81 | Firefox for AndroidNo supportNo | Opera AndroidFull support58 | Safari on iOSFull support12.2 | Samsung InternetFull support13.0 |
Screen Reader support For aria-colcount
| Expectation | JAWS | Narrator | NVDA | Orca | TalkBack | VoiceOver (iOS) | VoiceOver (macOS) | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Edge | Chrome | Edge | Firefox | Firefox | Chrome | Safari | Safari | |
| MUST convey the total column count when some columns are hidden | supported | supported | supported | supported | supported | supported | supported | unknown | none | none | none |
| MUST NOT convey a column count when total column count is unknown | none | none | none | none | none | none | none | unknown | none | none | none |
aria-colcount Example
The following example shows a grid with 16 columns, of which columns 2, 3, 4, and 9 are displayed to the user.
<div role="grid" aria-colcount="16">
<div role="rowgroup">
<div role="row">
<span role="columnheader" aria-colindex="2">First Name</span> <span role="columnheader" aria-colindex="3">Last Name</span> <span role="columnheader" aria-colindex="4">Company</span> <span role="columnheader" aria-colindex="9">Phone</span>
</div>
</div>
<div role="rowgroup">
<div role="row">
<span role="gridcell" aria-colindex="2">Fred</span> <span role="gridcell" aria-colindex="3">Jackson</span> <span role="gridcell" aria-colindex="4">Acme, Inc.</span> <span role="gridcell" aria-colindex="9">555-1234</span>
</div>
<div role="row">
<span role="gridcell" aria-colindex="2">Sara</span> <span role="gridcell" aria-colindex="3">James</span> <span role="gridcell" aria-colindex="4">Acme, Inc.</span> <span role="gridcell" aria-colindex="9">555-1235</span>
</div>…
</div>
</div>Characteristics
Used in Roles
Inherits into Roles
Value
- integer
- A numerical value without a fractional component.
Semantic HTML
No HTML element equivalent.
Reference
- W3C (opens new window)
- A11Y Support
- MDN Web Docs
