removeeventlistener

来源： https://stackoverflow.com/questions/54067294/how-to-deactivate-dragcontrols-in-three-js

来源： https://stackoverflow.com/questions/54067294/how-to-deactivate-dragcontrols-in-three-js

来源： https://stackoverflow.com/questions/54067294/how-to-deactivate-dragcontrols-in-three-js

问题 I have a simple Cordova project with Angular Framework. I am using https://github.com/auctifera-josed/cordova-plugin-idynamo plugin to communicate with MagTek device. I am listening to the 'magtekEvent' on load of a particular screen to capture the data. Every time I go to other screen and come back to this screen I can see the event is triggering multiple times based on the number of time I visit this screen. I tried removing the event but nothing happened. Can anyone help me on how to stop

问题 In React Hooks documents it is shown how to removeEventListener during the component's cleanup phase. https://reactjs.org/docs/hooks-reference.html#conditionally-firing-an-effect In my use case, I am trying to removeEventListener conditional to a state property of the functional component. Here's an example where the component is never unmounted but the event listener should be removed: function App () { const [collapsed, setCollapsed] = React.useState(true); React.useEffect( () => { if

问题 How do I remove the click listener I bound to window in the constructor below? I need it to listen on window , and I need access to the button instance inside it. class MyEl extends HTMLButtonElement { constructor() { super(); this.clickCount = 0; window.addEventListener('click', this.clickHandler.bind(this)); } clickHandler(e) { if (e.target === this) { this.textContent = `clicked ${++this.clickCount} times`; window.removeEventListener('click', this.clickHandler); } } disconnectedCallback()