count-down | 一个js写的倒计时插件（A countdown plugin written by JS） | Frontend Framework library
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一个js写的倒计时插件（A countdown plugin written by JS）
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QUESTION
I have a simple Angular app that allows users to do some heavy calculations on their end (must not be on the server). I am currently using a customized ngx-spinner to show a loading screen during the calculation. I would like to know (if possible) how to make the loading screen interactive, meaning: can respond to user input or can change the display (e.g. text or image) as time goes while the calculation is being carried out.
You can imagine it as a mini-game that a user can play while it is loading, a count-down timer, or even just a clock that shows the current time. Any of them would be great.
The flow would look like this:
(1) A user issues a calculation command
(2) Show the loading screen and then start the calculation
- user should be able to click on the loading screen for some effects, and/or see changes as time goes while waiting for the result
(3) calculation is done, display the result and hide the loading screen
So far I have tried to set up a timer (either using rxjs or setInterval) to periodically update it or bind the HTML element with an event handler but they only work when there's nothing running synchronously (if I simply show the loading screen without doing any calculation). I know it probably has something to do with the fact that the UI thread(?) is occupied by the calculation but I don't know any way to circumvent that (or to use any other thread). Is this a limitation of single-page applications or is it just not possible in general? (If yes, is there any way to fake it and make it look like what I described? And not just using a loading gif.)
First Edit: I have just found a similar and (easier?) question: Update webpage to show progress while javascript is running in in a loop but could be a bit limited. I still like to know if there is a general solution without needing to split up every long process to indicate progress but simply update the spinner according to a timer (or user interaction) regardless.
Disclaimer: I'm fairly new to Angular, as well as real-world apps. Apologies for any misuse of languages or any presence of dumb ideas.
...ANSWER
Answered 2021-Jun-01 at 14:33If part of the problem is that the web page is 'frozen' or 'stalled' while waiting for the calculation to complete, it might be possible for you to have the calculation itself performed in a web worker: https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers
You can do something like:
- Create a web worker file and put some logic in there which will perform the calculations.
- Add events for "onCalculationReceived" and "onCalculationComplete". The web worker will listen for the first event, perform calcuations, and dispatch the second.
- Where the calculation is invoked, dispatch the first event and wait for the second event.
With that, you should have no problems with letting the user interact with the UI while the expensive calculation is being performed.
QUESTION
ANSWER
Answered 2021-May-06 at 10:40Change this:
QUESTION
I had another question open about iterative menu logic, and the problem morphed into button logic, so I'm separating them, since the original question was truly settled.
My code is as follows:
...ANSWER
Answered 2021-Apr-05 at 10:00With both of your buttons tied to ground, and using PULL_UP the code is just:
QUESTION
I've got a script that I'm adapting to micropython on a 2040, and I want to use two buttons to navigate the menu structure. I can't figure out how to make the iterate loop in the multi-choice menus work right... here's what I've got so far:
...ANSWER
Answered 2021-Mar-30 at 03:490.01 second is way too short. The key is, after you detect "button down", you need to wait for "button up". You need something like:
QUESTION
I'm struggling with this script where I need to "select" an attribute of a HTML tag.
Its an application that when I click on button would start this countdown but
I'm using and customized countdown that I found. And it has this attribute named "data-date"
...ANSWER
Answered 2021-Mar-06 at 15:46In JS, property names that aren't valid identifiers cannot be accessed using the dot syntax.
For regular JS object, you could bypass this limitation by using the bracket syntax, but that won't work for HTML elements (it will set the property, but the property won't become the attribute of the element).
However, there's a way to manipulate data-* attributes of an element using the dataset property:
QUESTION
Exercise 8.24 and 8.26 of David Touretzky's "A Gentle Introduction to Symbolic Computation" state:
8.24: Write COUNT-DOWN, a function that counts down from n using list-consing recursion. (count 5) should produce the list (5 4 3 2 1).
8.26: Suppose we wanted to modify COUNT-DOWN so that the list it constructs ends in zero. For example, (COUNT-DOWN 5) would produce (5 4 3 2 1 0). [...]
So I tried to combine the two exercises into a function countdown that takes a keyword argument incl-zero, like so:
ANSWER
Answered 2021-Jan-13 at 11:47omg I feel stupid.
QUESTION
Timer is not working in javascript. I want to have a countdown timer that works automatically. But here, only hour hand is moving. Seconds and minutes are not changing at all. The code is as follows :
...ANSWER
Answered 2021-Jan-11 at 14:23Typo const min = document.querySelector(".mins .numb");
Improvement:
QUESTION
I have a count-down timer that when the user presses submit it starts counting down.
I have an if statement that is reducing the timer 1 second at a time and another function that starts vibrating the phone once the timer starts hitting 3 seconds. Problem is that the vibration starts immediately as soon as the count timer runs.
When I do this.state.seconds == or === 3 the vibration won't work.
If I do an assignment of =3 then the timer count down runs fine but the vibration runs the entire time which means if the timer is 10seconds it'll vibrate for 10 seconds.
What am I doing wrong?
...ANSWER
Answered 2020-Dec-22 at 19:22Because you make a comparison only once when you press the button. You need to check it on every tick.
QUESTION
Hello everyone is there any why to show a bootstrap-vue alert at the beginning of my method and dismiss the alert at the end of my method. I use javascript if you wounder.
I tried to do it with:
...ANSWER
Answered 2020-Nov-19 at 09:54Use v-model instead of v-if. Here is a simple example with a 2 second delay:
QUESTION
I wrote a program to explore Tkinter & try out object-oriented programming. My goal is to draw concentric circles, starting with the outside and moving in.
The drawing works fine, but my time-delay between circles isn't working. I can see the count-down (with print) but it doesn't draw anything until after the count-down ends.
Possibly this is related to the creation of the object? Nothing happens until the object is finished being created? IDK.
Here's my code:
...ANSWER
Answered 2020-Jul-17 at 21:22When you use the sleep() function, the application suspends updates to the GUI. This means that the drawing of circles is also suspended. But you can force the application to update the GUI before it continues with update_idletasks(), see example below. I chose to make the update in the Circle.draw_circle() function:
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