Issue #380 (focus() arg, Testing, JS Libs, Uncats)
The focus() method is a well known feature for programmatically forcing focus on a form element or other element on the page that has the ability to be focused.
This past week I came across a relatively new optional argument now available when using focus(). Here's how the syntax looks:
The focus() method now accepts an options object that takes one property/value pair – the preventScroll property with a value of either true or false.
This option tells the browser whether you want the page to scroll to bring the newly focused element into view. This means the element will still receive focus but it won't scroll jarringly into the viewport, which often happens when focus() is abused.
Try it on CodePen
In the demo, there are two buttons. The first one focuses the element normally. As a result, the page gets scrolled because the input being focused is at the bottom.
The second button uses the preventScroll option. The input is still focused, but the page doesn't scroll. Notice if you use the second button then immediately start typing some text, the page will only scroll down once you begin typing.
This is a nice improvement to the focus() method and I'm almost inclined to want browsers to implement this as the default since scrolling due to focus has always been an annoyance on the web. In fact, you'll notice in the demo that I've included preventScroll: false on the first button. This way, if browsers decide to implement preventScroll: true as a default, this demo will still work correctly.
Now on to this week's tools!
Testing and Debugging Tools
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