javascript Chart circular gauge color-bar

jscharting.com/examples/chart-types/circular-gauge/colorbar-marker/#

jQuery 데이터 속성 값을 기반으로 요소를 찾는 방법은 무엇입니까?

jQuery how to find an element based on a data-attribute value?

I've got the following scenario:

var el = 'li';

and there are 5 <li>'s on the page each with a data-slide=number attribute (number being 1,2,3,4,5 respectively).

I now need to find the currently active slide number which is mapped to var current = $('ul').data(current); and is updated on each slide change.

So far my tries have been unsuccessful, trying to construct the selector that would match the current slide:

$('ul').find(el+[data-slide=+current+]);

does not match/return anything…

The reason I can't hardcode the li part is that this is a user accessible variable that can be changed to a different element if required, so it may not always be an li.

How to format $.now() with Jquery

$.now() gives me the time as miliseconds. I need to show it something like hh:mm:ss

$ .now ()는 시간을 밀리 초 단위로 제공합니다. hh : mm : ss와 같이 표시해야합니다.

How to format $.now() with Jquery

function formatTimeOfDay(millisSinceEpoch) {
  var secondsSinceEpoch = (millisSinceEpoch / 1000) | 0;
  var secondsInDay = ((secondsSinceEpoch % 86400) + 86400) % 86400;
  var seconds = secondsInDay % 60;
  var minutes = ((secondsInDay / 60) | 0) % 60;
  var hours = (secondsInDay / 3600) | 0;
  return hours + (minutes < 10 ? ":0" : ":")
      + minutes + (seconds < 10 ? ":0" : ":")
      + seconds;
}

.

 jQuery - append, prepend, after, before

before : 선택한 요소의 앞에 내용 삽입

after : 선택한 요소의 뒤에 내용 삽입 

prepend : 선택한요소의 자식요소 앞에 내용삽입

append : 선택한요소의 자식요소 뒤에 내용삽입

.

[javascript] null, undefined, 공백 체크

// 넘어온 값이 빈값인지 체크합니다.
// !value 하면 생기는 논리적 오류를 제거하기 위해
// 명시적으로 value == 사용
// [], {} 도 빈값으로 처리
var isEmpty = function(value){
  if( value == "" || value == null || value == undefined || ( value != null && typeof value == "object" && !Object.keys(value).length ) ){
    return true
  }else{
    return false
  }
};

var value = 1; // Number 형 1 
console.log(value, typeof value); // 1 

number value = "1" // String 형 1 
console.log(value, typeof value); // 1 string
 
 
var value2 = "" 
if( value2 == ""){ 
    console.log("비어 있음"); 
}else{ 
    console.log("값이 있음"); 
}
 

기능 

• 간단한 클라이언트 사이드 라우팅
• Hot Module Replacement를 지원하는 Webpack 기반 작업환경
• Express 나 그 어떤 Node.js 서버와 함께 사용 가능
• Babel / Webpack 환경설정 커스터마이징 가능 

https://nextjs.org/

https://velopert.com/3293

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Automatic TypeScript configuration and compilation.

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Fast Refresh

Fast, reliable live-editing experience, as proven at Facebook scale.

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API Routes

Optionally create API endpoints to provide backend functionality.

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Optimized bundle splitting algorithm created by the Google Chrome team.

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