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Or we can use the ResizeObserver constructor to create an object that lets us watch an element for resizing. We can listen to resize events by assigning a resize event listener to the window object. We can select it with document.querySelector. If we want to watch the browser window’s resizing, then we can watch the html element. Then we call ro.observe with the element that we’re watching. Top and left have the x and y coordinates of the top left corner respectively.Įntry.target has the element we’re watching. The HTML DOM onresize event occurs on browser window resize. Width and height have the width and height of the element. We invoke the ResizeObserver constructor with a function that loops through the entries whyich has the items we’re watching.Īnd in the loop body, we get the dimensions from the ntentRect property. One way to add an event handler for the window resize event is to assign an event handler function to the window.onresize property.įor instance, we can write: window.onresize = (event) => ) ro.observe(document.querySelector('html')) Assign an Event Handler to the window.onresize Property The resize event is sent to the window element when the size of the browser window. In this article, we’ll look at how to watch the JavaScript window resize event to detect window resizes. Description: Bind an event handler to the resize JavaScript event.

We can watch window resize events with JavaScript to detect screen size changes of any kind.

Js onresize