javascript/html - 계산기

_·2020년 5월 1일
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<!--
* author : velog.io/@___
* path : ./index.html
-->
<!DOCTYPE html>
<html>
<head>
<title>계산기 제작 실습</title>

<link rel="stylesheet" href="./themes/style.css" type="text/css" />
<script src="./js/calc.js"></script>
</head>
<body>
<div class="main_container">
    <center>
        <img id="bonobono" src="https://media.vlpt.us/images/___/post/8322958b-7949-4b69-b28e-d2c02737e8df/%EB%B3%B4%EB%85%B8%EB%B3%B4%EB%85%B8200.png">
    <div class="calc_area">
    <table class="calc_table">
        <tr>
            <td colspan="4"><input type="text" id="view_result" class="calc_input"></td>
        </tr>
        <tr>
            <td colspan="4"><input type="text" id="input_value" class="calc_input"></td>
        </tr>
        <tr>
            <td onmousedown="_calculator.onMouseCalcDown(this)"  onmouseup="_calculator.onMouseCalcUp(this)" onmouseout="_calculator.onMouseCalcUp(this)" onclick="_calculator.clearAll()">AC</td>
            <td onmousedown="_calculator.onMouseCalcDown(this)"  onmouseup="_calculator.onMouseCalcUp(this)" onmouseout="_calculator.onMouseCalcUp(this)" onclick="_calculator.clearInputValue()">CE</td>
            <td onmousedown="_calculator.onMouseCalcDown(this)"  onmouseup="_calculator.onMouseCalcUp(this)" onmouseout="_calculator.onMouseCalcUp(this)" onclick="_calculator.appendRoundBrackets(this)">(</td>
            <td onmousedown="_calculator.onMouseCalcDown(this)"  onmouseup="_calculator.onMouseCalcUp(this)" onmouseout="_calculator.onMouseCalcUp(this)" onclick="_calculator.appendRoundBrackets(this)">)</td>
        </tr>
        <tr>
            <td onmousedown="_calculator.onMouseCalcDown(this)"  onmouseup="_calculator.onMouseCalcUp(this)" onmouseout="_calculator.onMouseCalcUp(this)" onclick="_calculator.append(this)">+</td>
            <td onmousedown="_calculator.onMouseCalcDown(this)"  onmouseup="_calculator.onMouseCalcUp(this)" onmouseout="_calculator.onMouseCalcUp(this)" onclick="_calculator.append(this)">-</td>
            <td onmousedown="_calculator.onMouseCalcDown(this)"  onmouseup="_calculator.onMouseCalcUp(this)" onmouseout="_calculator.onMouseCalcUp(this)" onclick="_calculator.append(this)">*</td>
            <td onmousedown="_calculator.onMouseCalcDown(this)"  onmouseup="_calculator.onMouseCalcUp(this)" onmouseout="_calculator.onMouseCalcUp(this)" onclick="_calculator.append(this)">/</td>
        </tr>
        <tr>
            <td onmousedown="_calculator.onMouseCalcDown(this)"  onmouseup="_calculator.onMouseCalcUp(this)" onmouseout="_calculator.onMouseCalcUp(this)" onclick="_calculator.append(this)">7</td>
            <td onmousedown="_calculator.onMouseCalcDown(this)"  onmouseup="_calculator.onMouseCalcUp(this)" onmouseout="_calculator.onMouseCalcUp(this)" onclick="_calculator.append(this)">8</td>
            <td onmousedown="_calculator.onMouseCalcDown(this)"  onmouseup="_calculator.onMouseCalcUp(this)" onmouseout="_calculator.onMouseCalcUp(this)" onclick="_calculator.append(this)">9</td>
            <td onmousedown="_calculator.onMouseCalcDown(this)"  onmouseup="_calculator.onMouseCalcUp(this)" onmouseout="_calculator.onMouseCalcUp(this)" onclick="_calculator.append(this)">%</td>
        </tr>
        <tr>
            <td onmousedown="_calculator.onMouseCalcDown(this)"  onmouseup="_calculator.onMouseCalcUp(this)" onmouseout="_calculator.onMouseCalcUp(this)" onclick="_calculator.append(this)">4</td>
            <td onmousedown="_calculator.onMouseCalcDown(this)"  onmouseup="_calculator.onMouseCalcUp(this)" onmouseout="_calculator.onMouseCalcUp(this)" onclick="_calculator.append(this)">5</td>
            <td onmousedown="_calculator.onMouseCalcDown(this)"  onmouseup="_calculator.onMouseCalcUp(this)" onmouseout="_calculator.onMouseCalcUp(this)" onclick="_calculator.append(this)">6</td>
            <td onmousedown="_calculator.onMouseCalcDown(this)"  onmouseup="_calculator.onMouseCalcUp(this)" onmouseout="_calculator.onMouseCalcUp(this)" onclick="_calculator.removeInputCharacter()">←</td>
        </tr>
        <tr>
            <td onmousedown="_calculator.onMouseCalcDown(this)"  onmouseup="_calculator.onMouseCalcUp(this)" onmouseout="_calculator.onMouseCalcUp(this)" onclick="_calculator.append(this)">1</td>
            <td onmousedown="_calculator.onMouseCalcDown(this)"  onmouseup="_calculator.onMouseCalcUp(this)" onmouseout="_calculator.onMouseCalcUp(this)" onclick="_calculator.append(this)">2</td>
            <td onmousedown="_calculator.onMouseCalcDown(this)"  onmouseup="_calculator.onMouseCalcUp(this)" onmouseout="_calculator.onMouseCalcUp(this)" onclick="_calculator.append(this)">3</td>
            <td rowspan="2" onmousedown="_calculator.onMouseCalcDown(this)"  onmouseup="_calculator.onMouseCalcUp(this)" onmouseout="_calculator.onMouseCalcUp(this)" onclick="_calculator.calculate()">=</td>
        </tr>
        <tr>
            <td colspan="2" onmousedown="_calculator.onMouseCalcDown(this)"  onmouseup="_calculator.onMouseCalcUp(this)" onmouseout="_calculator.onMouseCalcUp(this)" onclick="_calculator.append(this)">0</td>
            <td onmousedown="_calculator.onMouseCalcDown(this)"  onmouseup="_calculator.onMouseCalcUp(this)" onmouseout="_calculator.onMouseCalcUp(this)" onclick="_calculator.appendDecimalPoint(this)">.</td>
        </tr>
    </table>
</div>
</center>
</div>
</body>
</html>
/**
* author : velog.io/@___
* path : ./js/calc.js
*/

const _calculator = {
    isHead : true,
    isNumberClick : false,
    bracketsCount : 0,  // 소괄호 '(' 개수 카운트
    onMouseCalcDown : target => {
        let bonobono = document.getElementById('bonobono');
        target.style.backgroundColor="#BFBFBF";
        bonobono.src = "https://media.vlpt.us/images/___/post/1921441f-d6f0-4e65-bb3c-79ec9b68f7a5/KakaoTalk_20200508_185302101.png";
        setTimeout(()=>{
            bonobono.src = "https://media.vlpt.us/images/___/post/8322958b-7949-4b69-b28e-d2c02737e8df/%EB%B3%B4%EB%85%B8%EB%B3%B4%EB%85%B8200.png";
        }, 200);
    },
    onMouseCalcUp : target => target.style.backgroundColor="#FFFFFF",
    inputToResultView : () => {
        // id(input_value).value -> id(view_result).value
        let srcTarget = document.getElementById('input_value');
        let destTarget = document.getElementById('view_result');

        destTarget.value += srcTarget.value;
        srcTarget.value = "";
     },
    append : (target) => {
        // key : 숫자, 연산자
        let value = target.innerText;
        let inputTarget = document.getElementById('input_value');
        let resultTarget = document.getElementById('view_result');
        let currentInputCheck = !isNaN(value);

        // 연산자 연속 입력 확인
        if(!currentInputCheck && !_calculator.isNumberClick)
            if(!_calculator.isHead) return;
            else {
                // 음-양수 부호
                if(value !== '+' && value !== '-') return;
            }
        
      if(resultTarget.value !== ""){
          // 'view_result'에 숫자가 뒤 이어 삽입되지 않도록
          let lastCharacter = resultTarget.value.substr(resultTarget.value.length - 1);
          // result view의 마지막 문자와 현재 입력된 문자가 숫자일때는 입력 취소
         if(!isNaN(lastCharacter) && currentInputCheck) return;
      }

        // 다음 입력을 위해 현재 입력한 문자가 숫자인지 flag에 저장
        _calculator.isNumberClick = currentInputCheck;

        let viewTarget = _calculator.isNumberClick ? inputTarget : resultTarget;
        // 숫자가 아닐 경우 result view로 넘김
        if(!_calculator.isNumberClick){
            _calculator.inputToResultView();
        }
        viewTarget.value += value;
        _calculator.isHead = false;
     },
     appendRoundBrackets : (target) => {
         // key : ( )
        let viewTarget = document.getElementById('view_result');
        
        _calculator.inputToResultView();

        if(target.innerText == '('){
            // 직전에 숫자를 입력했나? -> 직전 숫자와 '(' 사이에는 연산자가 필요하므로
            if(_calculator.isNumberClick) return;
            ++_calculator.bracketsCount;
        }else{
        if(_calculator.bracketsCount == 0) return;
            --_calculator.bracketsCount;
        }

        viewTarget.value += target.innerText;
        _calculator.isHead = false;
        _calculator.isNumberClick = false;
     },
     appendDecimalPoint : target => {
         // key : .
        let inputTarget = document.getElementById('input_value');

      if(inputTarget.value !== ""){
          // 'input_value'에서 앞 자리에 숫자가 존재하는지
          let lastCharacter = inputTarget.value.substr(inputTarget.value.length - 1);
         if(isNaN(lastCharacter)) return;
      }else return;

        let value = target.innerText;
        inputTarget.value += value;
        _calculator.isHead = false;
     },
     calculate : () => {
         // key : =
        _calculator.inputToResultView();
        let viewTarget = document.getElementById('view_result');
        if(viewTarget.value !== ""){
            try {
                viewTarget.value = eval(viewTarget.value);
            } catch (error) {
                // eval()를 통해 에러가 발생한 경우 : 계산 문법 오류
                viewTarget.value += " => math expression error ! ";
            }
        }
     },
     removeInputCharacter : () => {
         // key : ← 
        let inputTarget = document.getElementById('input_value');
        inputTarget.value = inputTarget.value.slice(0, -1);
     },
     clearInputValue : () => {
         // key : CE
        document.getElementById('input_value').value = "";
     },
     clearAll : () => {
         // key : AC
        document.getElementById('view_result').value = "";
        document.getElementById('input_value').value = "";
        _calculator.bracketsCount = 0;
        _calculator.isHead = true;
        _calculator.isNumberClick = false;
     },
     
}
/**
* author : velog.io/@___
* path : ./themes/style.css
*/

@charset "UTF-8";


.calc_table{
    position: relative;
    background-color: #FFFFFF;
    border: 1px solid;
    width: 100%;
    max-width: 202px;
    min-height: 320px;
    text-align: center;
    table-layout: fixed;
}

.calc_input{
    border: none;
    text-align: right;
}

td {
    border: 1px solid;
}

/**/
body { 
    background-color: #00FFFF;
}
/**/

.main_container{
    position: absolute;
    width:100%; 
    /*
    top: 100px;
    /**/
}

.calc_area{
    position: relative;
    height: 100%;
    width: 202px;
}
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