debouncing | 易学教程

My implementation of debounce axios request left the promise in pending state forever, is there a better way?

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问题 I need a simple debounce function with immediate always true. Without resorting to lodash and with the help of Can someone explain the "debounce" function in Javascript , I implemented it as following, function debounce(func, wait) { var timeout; return function() { if (!timeout) func.apply(this, arguments); clearTimeout(timeout); timeout = setTimeout(()=>{timeout = null}, wait); }; }; It works as expected until I need to debounce axios request. Assumed I have a debounced axios method, I

Cancelling method calls when the same method is called multiple time

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问题 I think there's probably a name for what I'm describing here, but I don't know it. So my first question would be to know the name of this technique. Here's an example: suppose you're implementing live search on a web page. Everytime the user types in the search box, you fire a new search query, and the results are updated as often as possible. This is a stupid thing to do because you'll send much more queries than you actually need. Sending a request once per 2-3 letters or at most once per

What does RxJS.Observable debounce do?

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问题 Can anybody explain in plain English what RxJS Observavle debounce function does? I imagine it emits an event once in a while depending on the parameters, but my code below doesn't work as I expected. var x$ = Rx.Observable.fromEvent(window, 'click') .map(function(e) {return {x:e.x, y:e.y};}) .debounce(1000) .subscribe(function(el) { console.log(el); }); and the JsBin version. I expected that this code would print one click once per second, no matter how fast I am clicking. Instead it prints

why does my debouncer not work?

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问题 I'm trying to write a debouncer that will only return a valid argument (>0) if it has been debounced (-1 four bouncing). I've come up with this so far but it always returns -1, why is that I'm wondering: #include <stdio.h> #include <time.h> #include <unistd.h> #define BOUNCETIME 500000000 //(500ms) #define SetTime(x) clock_gettime(CLOCK_REALTIME, (x)); // set time static struct timespec tset; struct timespec tnow; int DeBounce(unsigned int arg) { static int val = -1; long long nsec = 0; if

Consecutive writings to several files in the server

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问题 (* As my previous question has been more or less answered, and the code has evolved, I open a new question. *) I want to build a simple playground with MEAN stack that mimics plunker: we have a list of files and a textarea on the left hand, and a live preview on the right hand. Note that the files are saved in a temporary folder, and the live preview is an iframe injected by the files from that temporary folder. ********** what I have written ********** In the html file, I add one controller

How to Run Function Once On Load (then by Observer) in Polymer

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问题 I am trying to run getResponse once when this web component loads, and then each time the procedure property changes. However, when trying to run this debounce function, it is invoked 4 times and getResponse runs after a delay, but 4 times instead of 1. static get properties() { return { procedure: { type: String, observer: 'getResponse' }, timeout: { type: Number, value: null } } } ready() { super.ready(); this.debounce(); } debounce() { console.log('debounce'); this.procedure =

debounce function means e.preventDefault on mousewheel no longer working

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问题 I am chaging the background of the page using mousewheel. I only want to trigger the mousewheel event once 1000ms, so for that I am using a debounce function. Before I added the debounce function and used e.preventDefault() it prevented the scroll from working. However, now that I have added the debounce function this no longer works and the user can scroll the page again. Please see code below. $(document).ready(function() { $(document).on('mousewheel DOMMouseScroll',debounce(function(e){ e

Throttle & debounce functions

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问题 I am a bit uncertain with the concepts of throttle and debounce functions. As I get it: we debounce a function that should be called after a certain event has happened. It is used in events like drag, keyup, etc. with the purpose of not firing all the time the event gets fired but instead when the series of events is done. Typically after a whole word has been typed, or a drag or resize sequence has ended. we throttle a function that should fire while a series of events is happening, but when

How to use debounce on async function? [duplicate]

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问题 This question already has answers here : Write async function with Lodash in a Vuejs component (2 answers) Closed last year . How can I use debounce on an async function? I have a method within my vue -app which reveives data from an API which calls the API continuosly which I want to avoid. Here is my method: methods: { async getAlbums () { const response = await AlbumService.fetchAlbums() this.albums = response.data.albums } } I've installed lodash previously so how can I achieve that? 回答1:

Testing a debounced function in AngularJS with Jasmine never calls the function

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I have a method in a service that uses underscore's debounce. Inside that method is a call to a method on a different service. I'm trying to test that the different service is called. In my attempts to test the debounced method, the different services' method is never called, and jasmine fails with: "Expected spy aMethod to have been called." I know for a fact that it IS called (it logs to console in chrome), it's just called AFTER the expectation already failed. So... (preferably) without adding Sinon or another dependency and with bonus points* given to a solution doesn't have to turn the _