IE will not fire keypress events for non-alphanumeric keys. Use onkeydown to trap key events, not onkeypress Here's an example of a WAI-ARIA tree view using this technique. update the tabindex of the previously focused element to "-1".update the tabindex of the focused element to "0", and.programmatically apply focus to the new element,. ![]() To do this:īind a key down handler to each element in the group, and when an arrow key is used to move to another element: ![]() This technique involves programmatically moving focus in response to key events and updating the tabindex to reflect the currently focused item. Note that updating the tabindex to "0" requires also updating the previously selected item to tabindex="-1". Setting the tabindex of the focused element to "0" ensures that if the user tabs away from the widget and then returns, the selected item within the group retains focus. aria-activedescendant: managing a 'virtual' focus.Roving tabindex: programmatically moving focus.There are two techniques for accomplishing this: When a user tabs away from a widget and returns, focus should return to the specific element that had focus, for example, the tree item or grid cell. Note that disabled items within a grouped widget (such as menu items in a menu) should remain navigable using arrow keys. When a custom control becomes disabled, remove it from the tab order by setting tabindex="-1". Left Centered Right Justify Disabled controls For techniques for managing focus within widgets, see "Managing focus inside groups" below. Once keyboard focus lands on the containing element, the JavaScript developer must programmatically manage focus and respond to arrow keys. The example below shows this technique used with a nested menu control. ![]() (For a full description of the keyboard support that is normally expected for typical widgets, see the WAI-ARIA Authoring Practices.) Users should be able to navigate the descendant elements using arrow keys. ![]() Grouping controlsįor grouping widgets such as menus, tablists, grids, or tree views, the parent element should be in the tab order ( tabindex="0"), and each descendant choice/tab/cell/row should be removed from the tab order ( tabindex="-1"). This is particularly useful for components that use interactive elements that do not exist in HTML. Native HTML elements that are interactive, like, and, are already accessible by keyboards, so to use one of them is the fastest path to make components work with keyboards.Īuthors can also make a or keyboard accessible by adding a tabindex of 0. Tabindex value determines where this element is positioned in the tab order: smaller values will position elements earlier in the tab order than larger values (for example, tabindex="7" will be positioned before tabindex="11"). In tab order relative to element's position in document (note that interactive elements like have this behavior by default, they don't need the attribute). No author must focus the element with focus() in response to arrow or other key presses. The following table describes tabindex behavior in modern browsers: tabindex attributeįocusable with mouse or JavaScript via element.focus()įollows the platform convention of the element (yes for form controls, links, etc.).įollows the platform convention of the element. Elements with a positive tabindex are put before the default interactive elements on the page, which means page authors will have to set (and maintain) tabindex values for all focusable elements on the page whenever they use one or more positive values for tabindex. Warning: avoid using positive values for tabindex.
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