Is getBoundingClientRect slow?
Even when the getBoundingClientRect() is used in asynchronous function, it’s still slower. In the Torus Kit, we’re using this approach to get element bounds as fast as possible without unnecessary reflows. So when you making effects with Torus Kit, you don’t need to worry about the performance.
How does getBoundingClientRect work?
getBoundingClientRect returns an object with several key/value pairs that give you information on the element’s size and positioning within the webpage. The x and y values will be equivalent to the left and top values. Because of this, some browsers omit x and y and only return left and top .
What is getBoundingClientRect () Top?
The getBoundingClientRect() method returns the size of an element and its position relative to the viewport. This method returns a DOMRect object with eight properties: left, top, right, bottom, x, y, width, height.
Does getBoundingClientRect include padding?
Border, padding and margin are not included.
Is getComputedStyle cached?
Yes. getComputedStyle returns a live collection of CSS properties.
What triggers reflow?
Resizing the browser window, using JavaScript methods involving computed styles, adding or removing elements from the DOM, and changing an element’s classes are a few of the things that can trigger reflow.
What is Dom rect?
A DOMRect describes the size and position of a rectangle. The type of box represented by the DOMRect is specified by the method or property that returned it.
How do you measure the height of a viewport?
You can use the window. innerHeight property to get the viewport height, and the window. innerWidth to get its width. let viewportHeight = window.
What is client rect?
Remarks. Apply the getClientRects method to an element or text range object to get a collection of ClientRect objects. The getClientRects method returns a collection of rectangles, exposing for each rectangle the left, top, right, and bottom coordinates relative to the client.
What is FastDOM?
FastDOM, a library for separating reading and writing to and from the DOM automatically, is a helpful abstraction that reduces the number of forced synchronized layouts. It’s a pretty small library. If you really wanted to, you could write this library yourself.
How do you stop reflowing?
Here are some easy guidelines to help you minimize reflow in your web pages:
- Reduce unnecessary DOM depth.
- Minimize CSS rules, and remove unused CSS rules.
- If you make complex rendering changes such as animations, do so out of the flow.
How does the getboundingclientrect ( ) method work?
The getBoundingClientRect () method returns the size of an element and its position relative to the viewport. This method returns a DOMRect object with eight properties: left, top, right, bottom, x, y, width, height. Note: The amount of scrolling that has been done of the viewport area is taken into account when computing the bounding rectangle.
How is scrolling taken into account in bounding rectangle?
The amount of scrolling that has been done of the viewport area (or any other scrollable element) is taken into account when computing the bounding rectangle.
Are there properties in the returned domrect object?
Properties in the returned DOMRect object are not own properties. While the in operator and for…in will find returned properties, other APIs such as Object.keys () will fail.
What causes wrong values for scrolly / pageyoffset in edge?
Pinch-zoom in Microsoft IE or Edge causes wrong values for scrollY/pageYOffset. Edit: The above code can be simplified a lot by just using document.body.getBoundingClientRect () instead of adding a div – I haven’t tried it though so I am leaving my answer as it stands.