We pass an empty dependencies array to useEffect, so that it is called only once in the component’s lifetime, and the resize event listener is only registered once – when the component first renders. In our example, the action is to add the event listener for the resize hook with the addEventListener() method. Printable Basic DIY Event Flyer Template or Invite for Local, Corporate, Fundraiser, Holiday, School, Training Events & More. The useEffect hook is used to perform an action when a component first renders, and when one or more specified dependencies change. The first is a variable that stores the state, and the second is a function that updates the state when it is called. The useState hook returns an array of two values. We will set it during the mounted lifecycle hook using the window.innerHeight and window.innerWidth properities. Set the initial height/width when the component mounts. Remove the event listener during the destroyed lifecycle hook to stop listening for resize. We use the useState React hook to create a state variable that will update whenever the width of the window changes. Add an event listener during the created lifecycle hook to listen for resize. The resize event is fired whenever the width or height of the window/document view changes. The innerWidth property returns the interior width of the window in pixels, including the width of the vertical scrollbar, if it is present. The text is updated with the width of the window when it is resized.
Window.addEventListener('resize', handleWindowResize) Javascript examples for DOM Event:onresize. Import from 'react' Ĭonst = useState(window.innerWidth) Run objects function in window resize event - Javascript DOM Event.
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