calculator/script.js at main · IndraMahayana/calculator · GitHub

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const number = document.querySelectorAll('.number')
const operation = document.querySelectorAll('.operation')
const resultLast = document.querySelector('.result')
const clear = document.querySelector('.clear')
const del = document.querySelector('.delete')
const overoutput = document.querySelector('.overoutput')
const underoutput = document.querySelector('.underoutput')
const tempoutput = document.querySelector('.tempoutput')

var output1 = ''
var output2 = ''
var result = null
var operationLast = ''
var oneDot = false

number.forEach( number => {
  number.addEventListener('click', (e) => {
    if ( e.target.innerText === '.' && !oneDot) {
      oneDot = true
    } else if ( e.target.innerText === '.' && oneDot) {
      return
    }
    output2 += e.target.innerText
    underoutput.innerText = output2
  })
})

operation.forEach( (operation) => {
  operation.addEventListener('click', (e) => {
    if (!output2) return
    oneDot = false
    const operationName = e.target.innerText
    if (output1 && output2 && operationLast) {
      mathOperation()
    } else {
      result = parseFloat(output2)
    }
    clearVar(operationName)
    operationLast = operationName;
  })
})

function clearVar(name = '') {
  output1 += output2 + ' ' + name + ' '
  overoutput.innerText = output1
  underoutput.innerText = ''
  output2 = ''
  tempoutput.innerText = result
}

function mathOperation() {
  if (operationLast === "x") {
    result = parseFloat(result) * parseFloat(output2);
  } else if (operationLast === "+") {
    result = parseFloat(result) + parseFloat(output2);
  } else if (operationLast === "-") {
    result = parseFloat(result) - parseFloat(output2);
  } else if (operationLast === "/") {
    result = parseFloat(result) / parseFloat(output2);
  } else if (operationLast === "%") {
    result = parseFloat(result) % parseFloat(output2);
  }
}

resultLast.addEventListener('click', (e) => {
  if ( !output1 || !output2 ) return
  oneDot = false
  mathOperation()
  clearVar()
  underoutput.innerText = result
  tempoutput.innerText = ''
  output2 = result
  output1 = ''
})

clear.addEventListener('click', (e) => {
  underoutput.innerText = ''
  overoutput.innerText = ''
  tempoutput.innerText = ''
  output1 = ''
  output2 = ''
  result = ''
})

del.addEventListener('click', (e) => {
  underoutput.innerText = underoutput.innerText.toString().slice(0, -1)
  output2 = output2.toString().slice(0, -1)
})

window.addEventListener('keydown', (e) => {
  if (
    e.key === '0' ||
    e.key === '1' ||
    e.key === '2' ||
    e.key === '3' ||
    e.key === '4' ||
    e.key === '5' ||
    e.key === '6' ||
    e.key === '7' ||
    e.key === '8' ||
    e.key === '9' ||
    e.key === '.'
  ) {
    clicknumber(e.key)
  } else if (
    e.key === '+' ||
    e.key === '-' ||
    e.key === '/' ||
    e.key === '%'
   ) {
     clickoperation(e.key)
   } else if (e.key === '*') {
     clickoperation('x')
   } else if (e.key === 'Enter' || e.key === '=') {
     clickresult()
   } else if (e.key === 'Backspace') {
     clickdel()
   } else if (e.key === 'Delete') {
     clickclear()
   }
})

function clicknumber(key) {
  number.forEach((button) => {
    if (button.innerText === key) {
      button.click()
    }
  })
}

function clickoperation(key) {
  operation.forEach((button) => {
    if (button.innerText === key) {
      button.click()
    }
  })
}

function clickresult() {
  resultLast.click()
}

function clickdel() {
  del.click()
}

function clickclear() {
  clear.click()
}