¿Cómo se hace un enfoque automático en un campo de entrada?

How do you make an input field autofocus?

The autofocus attribute is a boolean attribute. When present, it specifies that an <input> element should automatically get focus when the page loads.

Method for Testing Autofocus

1. Place the card in a well-lit area, somewhere your camera will find it easy to focus on the card.
2. Now, place your camera the correct distance from the test card, 50 times the focal distance of the lens.
3. Open the aperture on your lens up to its widest.
4. Now, manually focus the lens to infinity.

What to do When Your Camera Won’t Focus

1. 1 – Remove and remount the lens. This is probably the most common reason that your camera won’t focus.
2. 2 – Check the AF/M switch on the lens.
3. 3 – Aim your focus point at an area of contrast.
4. 4 – Use the center focus point.
5. 5 – Make sure you aren’t too close.
6. 6 – It’s too dark.

JavaScript autofocusers (as given in the other answers here) will work but can be annoying for some users. For example, if you focus a different field while a page is still loading, the JavaScript may “help” you by moving the focus and making you type in the wrong field.

To use single autofocus mode: If you keep holding the shutter button half way down and recompose your shot by moving your camera, the area you focused on will still be in focus NB: There’s a danger with this method, particularly when shooting with a shallow depth of field, that your subject might no longer be in focus when you recompose.

When the button is clicked, the div slides down with an input field. How do I make this input field autofocus as soon as the div slides down? Thanks.

Add the following code to the body tag, substituting the form and field names for your own: That’s all there is to it — the OnLoad command instructs the browser to wait until all elements are loaded and then set the focus to the specified form/text field.