![]() ![]() Unfortunately window.onchange sometimes fires too often or not at all. We are only interested in events where our component changes its width. ![]() □ What’s the problem with window.onchange? In this article we will have a look at how it works and how we can use this new API together with Angular. ResizeObserver ResizeObserver - Web APIs | MDN is a new API to solve exactly this problem. Both solutions are based on the viewport dimension, not the element dimension. ![]() This is usually implemented with either window.onchange or matchMedia. But sometimes we need to know when an element is resized and execute some logic in JavaScript. Many changes in screen size or element size can be handled with pure CSS. That’s why I’ve created a library to simplify the usage with Angular. I found it to cumbersome to do it on every component. There are a few steps required to use it properly with Angular. ResizeObserver is a new API which allows us to react to element resizing. Any window belonging to a window class having these styles is invalidated each time the user or the application changes the size of the window.Sometimes we need to execute JavaScript when an element is resized.Ĭurrent solutions are based on the viewport dimension, not on element dimensions. To force the system to invalidate the entire client area of the window when a vertical, horizontal, or both vertical and horizontal change is made, an application must specify the CS_VREDRAW or CS_HREDRAW style, or both, when registering the window class. For example, a clock application that adapts the face of the clock to fit neatly within its window must redraw the clock whenever the window changes size. In this case, WM_PAINT is not generated when the size of the window is reduced.įor some windows, any change to the size of the window invalidates the contents. The system invalidates only the newly exposed portion of the window, which saves time when the eventual WM_PAINT message is processed by the application. When a window changes size, the system assumes that the contents of the previously exposed portion of the window are not affected and need not be redrawn. The system changes the size of a window when the user chooses window menu commands, such as Size and Maximize, or when the application calls functions, such as the SetWindowPos function. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |