Created
May 5, 2021 13:41
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PreventDefault error on OpenLayers 2
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const eventListenerOptionsSupported = () => { | |
let supported = false; | |
try { | |
const opts = Object.defineProperty({}, 'passive', { | |
get() { | |
supported = true; | |
} | |
}); | |
window.addEventListener('test', null, opts); | |
window.removeEventListener('test', null, opts); | |
} catch (e) {} | |
return supported; | |
} | |
const defaultOptions = { | |
passive: false, | |
capture: false | |
}; | |
const supportedPassiveTypes = [ | |
'scroll', 'wheel', | |
'touchstart', 'touchmove', 'touchenter', 'touchend', 'touchleave', | |
'mouseout', 'mouseleave', 'mouseup', 'mousedown', 'mousemove', 'mouseenter', 'mousewheel', 'mouseover' | |
]; | |
const getDefaultPassiveOption = (passive, eventName) => { | |
if (passive !== undefined) return passive; | |
return supportedPassiveTypes.indexOf(eventName) === -1 ? false : defaultOptions.passive; | |
}; | |
const getWritableOptions = (options) => { | |
const passiveDescriptor = Object.getOwnPropertyDescriptor(options, 'passive'); | |
return passiveDescriptor && passiveDescriptor.writable !== true && passiveDescriptor.set === undefined | |
? Object.assign({}, options) | |
: options; | |
}; | |
const overwriteAddEvent = (superMethod) => { | |
EventTarget.prototype.addEventListener = function (type, listener, options) { | |
const usesListenerOptions = typeof options === 'object' && options !== null; | |
const useCapture = usesListenerOptions ? options.capture : options; | |
options = usesListenerOptions ? getWritableOptions(options) : {}; | |
options.passive = getDefaultPassiveOption(options.passive, type); | |
options.capture = useCapture === undefined ? defaultOptions.capture : useCapture; | |
superMethod.call(this, type, listener, options); | |
}; | |
EventTarget.prototype.addEventListener._original = superMethod; | |
}; | |
const supportsPassive = eventListenerOptionsSupported(); | |
if (supportsPassive) { | |
const addEvent = EventTarget.prototype.addEventListener; | |
overwriteAddEvent(addEvent); | |
} |
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