![]() So there is the focus event that fires when an element gets the focus, and then there is the blur event that fires when that element looses the focus for whatever the reason. ![]() However there is also doing something when a focus event happens when it is simulate like this, or my any other means, to do this we just need to define one ore more focus event handlers for the element. When I load this in the browser the bar element is focus on for starters as expected so the focus method is useful for setting focus via javaScript. Here I have a simple example where I am just setting the focus of the input element that has an id of bar. Here in the html of a basic example that makes use of the javaScript focus event I have two input tags with ids assigned to them, I also have a script tag that links to some external javaScript that attaches some event handlers to the elements. However if you do want to push backward compatibility back farther for whatever the reason, there are other options that will work on old platforms. These days it might be best to stick with addEventLisneter for attaching an on focus event, or any event for that matter. For this there is the onfocus event, and addEventListener. There might be situations in which I will want to define some javaScript that will run each time a focus event happens for one or more elements. 1.1 - onfocus event hander for an element This test vjs repository is also where I have the source code examples on my many other posts on javaScript topics. The source code examples that I am writing about in this post can be found in my test vjs repository on Github. It might also be a good idea to read up more on event listeners and event objects that can be used in the body of a function that is used to create such listeners. These are examples that I will be keeping fairly simple but this is still not a getting started type post with javaScript in general. In this section I will be starting out with just a few quick examples of the on focus event in client side javaScript. In this post I will be covering some quick examples when it comes to working with focus javaScript events, how to attach handers for such events, and how to simulate them, and also how to make elements that can not be focused by default focusable. The javaScript focus event along with blur, onkeydown, and on change are often used all together when working out some kind of user interface that makes use of one ore more input tags. In addition there is also the on blur event that will happen when an element loses this focus after it has gained such a focus. There is also how to go about making an element an element that can be focused on with the tab index property. There is also the question of what elements can be focused on and why. So there are ways that a focus event can fire by way of user action, and there are also ways to which a focus event can be simulated by way of javaScript code. The typical way to do so would be by using an element reference object method such as the HTMLElement.focus method. In addition to setting the focus of an element by clicking on an element, and using the tab key on a keyboard, there are also ways in which a focus event can fire by way of javaScript code. For example it can also happen by using the tab button to cycle threw elements that can be focused in desktop environments such as input elements. ![]() This focus typically will happen when a user clicks on an element for example, but there are other things that can happen that would trigger such an event. The javaScript onfocus event is an event that will fire when the user sets what is often called the focus on an element.
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