The onfocus property of the GlobalEventHandlers mixin is an EventHandler that processes focus events on the given element.
Mozilla exists to build the Internet as a public resource accessible to all because we believe open and free is better than closed and controlled.
The focus event is raised when the user sets focus on an element.
- Camino is a Mac OS X-native browser built on Mozilla’s Gecko rendering engine.
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For onfocus to fire on non-input elements, they must be given the tabindex attribute (see Building keyboard accessibility back in for more details).
Note: The opposite of onfocus is onblur.
Syntax
Value
functionRef is a function name or a function expression. The function receives a FocusEvent object as its sole argument.
Example
Firefox Focus For Android
This example uses onblur and onfocus to change the text within an <input> element.
HTML
JavaScript
Mozilla Focus For Windows 10
Result
Try clicking in and out of the form field, and watch its contents change accordingly.
Specifications
| Specification | Status | Comment |
|---|---|---|
| HTML Living Standard The definition of 'onfocus' in that specification. | Living Standard |
Mozilla Focus Browser
Browser compatibility
BCD tables only load in the browser
In contrast to IE, in which almost all kinds of elements receive the focus event, almost all kinds of elements on Gecko browsers do NOT work with this event.
See also
focusevent- Related event handler:
GlobalEventHandlers.onblur
After a decade-long run, Camino is no longer being developed, and we encourage all users to upgrade to a more modern browser. Camino is increasingly lagging behind the fast pace of changes on the web, and more importantly it is not receiving security updates, making it increasingly unsafe to use.
Fortunately, Mac users have many more browsers to choose from than they did when Camino started ten years ago. Former Camino developers have helped build the three most popular – Chrome, Firefox, and Safari – so while this is the end of Camino itself, the community that helped build it is still making the web better for Mac users.
Mozilla Focus Android
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