Here is an example of using ResizeObserver to draw an ellipse inside canvas.įunction drawEllipse ( entry ) ) ro. The proposed API is an observer-style API.
#CSS FORCE RESPONSIVE RESIZE CODE#
They fail in correctness, code complexity, and performance. The absolute child method will not work in ShadowDOM, or frameworks such as React. The best hacks all use a similar absolute child trick: insert an absolutely-positioned child into the component,Īnd craft the child in such a way that it emits a scroll event, or a window.resize when parent's size changes. Others use clever hacks to approximate resize event. This approach is error-prone, hard to maintain, and requires every component to implement the homemade method. Some apps implement homemade resize notification framework (ex: Polymer). There is no way to replicate ResizeObserver functionality on today's Web Platform. ResizeObserver is needed to give components way to respond to changes in size.Īs Responsive Web Apps grow in popularity, so will the need for responsive components.
ResizeObserver wants to be that counterpart. There is no component counterpart to window.resize event either. There is no component counterpart to CSS media queries.Īttempts to design such were unsucessful due to their inability to deal with circular references. Unfortunatelly, Web Platform currently does not provide a way for components to keep track of their size. These components need to be responsive too. Responsive Web Apps can be built with components. Javascript DOM manipulation stays in sync with viewport size by listening to window.resize event. Javascript is used when CSS is not expressive enough.
This is often accomplished with CSS and media queries. Responsive Web Apps adjust their content to viewport size. Component: a self-contained bundle of HTML, CSS, and JS.
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