[RxJS] Creation operators: fromEventPattern, fromEvent
2024-08-27 09:02:49
Besides converting arrays and promises to Observables, we can also convert other structures to Observables. This lesson teaches how we can convert any addEventHandler/removeEventHandler API to Observables.
fromEvent(target, EventType):
var foo = Rx.Observable.fromEvent(document, 'click');
foo.subscribe(function (x) {
console.log('next ' + x);
}, function (err) {
console.log('error ' + err);
}, function () {
console.log('done');
});
fromEventPattern(addEventHandler, removeEventHandler): take two functions
function addEventHandler(handler){
document.addEventListener('click', handler)
}
function removeEventHandler(handler){
document.removeEventListener('click', handler)
}
var foo = Rx.Observable.fromEventPattern(addEventHandler, removeEventHandler);
foo.subscribe(function (x) {
console.log('next ' + x);
}, function (err) {
console.log('error ' + err);
}, function () {
console.log('done');
});
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