Question

This will be my third time submitting this question. THERE SHOULD BE NO USE OF CSS...

This will be my third time submitting this question. THERE SHOULD BE NO USE OF CSS OR SWITCH STATEMENTS IN THE JAVASCRIPT. Even though there is stylesheet in the HTML file do no create a new one.

Project Standards:

  • Students will use click events to capture user input.
  • Students will use variables to store information needed by their application and keep track of their program’s state.
  • Students will use conditionals to control project flow.

Project Task

You will be building a simple calculator in the browser. It should be able to add, subtract, divide, and multiply. Your program should do the following:

  1. Display a standard calculator to the user (you have starter files to help you with this).
  2. You will need to make references to all the proper HTML elements you'll be using to display elements to the user.
  3. You should make variables to keep track of the 1st number, operator, 2nd number, and the result of the math.
  4. When a user clicks on a button it should work like a standard calculator.
    1. Every number they click should be captured and build the 1st number until they click an operator (Ex. If they click 1 and 8, your program should display 18 to them)
    2. Clicking an operator (+, -, x, =) should only work if they have clicked numbers first.
    3. A user can only fill out the 2nd number once they have filled out the 1st number and clicked an operator.
    4. The = key will only work if a user has clicked both a 1st number, an operator, and a 2nd number. When they have filled in all the necessary inputs, = will display the proper number to them (Ex. if they input 5, +, and 7, they should be displayed 12).
    5. The clear button will clear all prior input and allow the user to start over.
  5. Your JavaScript code will form the conditional logic to determine whether a clicked button should work or not.
  6. You should display the 1st number, the operator, the 2nd number, and the math output (sum, product, difference, quotient) to the user at the appropriate times.

Starter HTML

---

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="UTF-8">

  <title>Calculator Starter</title>

  <!-- Added a link to Bootstrap-->

  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">

</head>

<body>

  <div class="jumbotron">

    <h1 class="text-center">JavaScript Calculator</h1>

  </div>

  <div class="container">

    <div class="row">

      <!-- Calculator Card -->

      <div class="col-lg-4">

        <div class="card">

          <h3 class="card-header">Calculator</h3>

          <div class="card-body">

            <button id="button-1" class="btn btn-primary number" value="1">1</button>

            <button id="button-2" class="btn btn-primary number" value="2">2</button>

            <button id="button-3" class="btn btn-primary number" value="3">3</button>

            <button id="button-plus" class="btn btn-danger operator" value="plus">+</button>

            <br><br>

            <button id="button-4" class="btn btn-primary number" value="4">4</button>

            <button id="button-5" class="btn btn-primary number" value="5">5</button>

            <button id="button-6" class="btn btn-primary number" value="6">6</button>

            <button id="button-minus" class="btn btn-danger operator" value="minus">&minus;</button>

            <br><br>

            <button id="button-7" class="btn btn-primary number" value="7">7</button>

            <button id="button-8" class="btn btn-primary number" value="8">8</button>

            <button id="button-9" class="btn btn-primary number" value="9">9</button>

            <button id="button-multiply" class="btn btn-danger operator" value="times">&times;</button>

            <br><br>

            <button id="button-0" class="btn btn-primary number" value="0">0</button>

            <button id="button-divide" class="btn btn-danger operator" value="divide">&divide;</button>

            <button id="button-power" class="btn btn-danger operator" value="power">^</button>

            <button id="button-equal" class="btn btn-success equal" value="equals">=</button>

            <br><br>

            <button id="button-clear" class="btn btn-dark clear" value="clear">clear</button>

          </div>

        </div>

      </div>

      <!-- Result Card -->

      <div class="col-lg-6">

        <div class="card">

          <h3 class="card-header">Result</h3>

          <div class="card-body">

            <h1 id="first-number"></h1>

            <h1 id="operator"></h1>

            <h1 id="second-number"></h1>

            <hr>

            <h1 id="result"></h1>

          </div>

        </div>

      </div>

    </div>

  </div>

  <script src="main.js"></script>

</body>

</html>

Starter JavaScript

---

// BUTTONS ON THE PAGE

const numberButtons = document.querySelectorAll('.number');

const operatorButtons = document.querySelectorAll('.operator');

const equalButton = document.querySelector('.equal');

const clearButton = document.querySelector('.clear');

// TODO make references to all the proper HTML elements you'll be using to display elements to the user

// TODO make variables to keep track of the 1st number, operator, 2nd number, and the result of the math.

for(let i = 0; i < numberButtons.length; i++) {

  numberButtons[i].addEventListener('click', clickNumber);

}

for(let i = 0; i < operatorButtons.length; i++) {

  operatorButtons[i].addEventListener('click', clickOperator);

}

equalButton.addEventListener('click', clickEqualButton);

clearButton.addEventListener('click', clickClearButton);

function clickNumber(event) {

  console.log(event.target.value);

  // CODE GOES HERE

}

function clickOperator(event) {

  console.log(event.target.value);

  // CODE GOES HERE

}

function clickEqualButton() {

  // CODE GOES HERE

}

function clickClearButton() {

  // CODE GOES HERE

}

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Homework Answers

Answer #1

As per your question, for the javascript calculator in HTML code in which you need to define the function and skeleton of the number, here the sample code in HTML which will be named as index.html, here the code:

<!DOCTYPE html>
<html>
<head>
<title>Java Script Calculator</title>
</head>
<body>

<div class="calculator">
  <div class="input" id="input"></div>
  <div class="buttons">
    <div class="operators">
      <div>+</div>
      <div>-</div>
      <div>&times;</div>
      <div>&divide;</div>
    </div>
    <div class="leftPanel">
      <div class="numbers">
        <div>7</div>
        <div>8</div>
        <div>9</div>
      </div>
      <div class="numbers">
        <div>4</div>
        <div>5</div>
        <div>6</div>
      </div>
      <div class="numbers">
        <div>1</div>
        <div>2</div>
        <div>3</div>
      </div>
      <div class="numbers">
        <div>0</div>
        <div>.</div>
        <div id="clear">C</div>
      </div>
    </div>
    <div class="equal" id="result">=</div>
  </div>
</div>

</body>
</html>

Do design the calculator, make use of CSS effects on numbers, operators such as + - x =, here the CSS code:

body {
  width: 500px;
  margin: 4% auto;
  font-family: 'Source Sans Pro', sans-serif;
  letter-spacing: 5px;
  font-size: 1.8rem;
  -moz-user-select: none;
  -webkit-user-select: none;
  -ms-user-select: none;
}

.calculator {
  padding: 20px;
  -webkit-box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
  box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
  border-radius: 1px;
}

.input {
  border: 1px solid #ddd;
  border-radius: 1px;
  height: 60px;
  padding-right: 15px;
  padding-top: 10px;
  text-align: right;
  margin-right: 6px;
  font-size: 2.5rem;
  overflow-x: auto;
  transition: all .2s ease-in-out;
}

.input:hover {
  border: 1px solid #bbb;
  -webkit-box-shadow: inset 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
  box-shadow: inset 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
}

.buttons {}

.operators {}

.operators div {
  display: inline-block;
  border: 1px solid #bbb;
  border-radius: 1px;
  width: 80px;
  text-align: center;
  padding: 10px;
  margin: 20px 4px 10px 0;
  cursor: pointer;
  background-color: #ddd;
  transition: border-color .2s ease-in-out, background-color .2s, box-shadow .2s;
}

.operators div:hover {
  background-color: #ddd;
  -webkit-box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
  box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
  border-color: #aaa;
}

.operators div:active {
  font-weight: bold;
}

.leftPanel {
  display: inline-block;
}

.numbers div {
  display: inline-block;
  border: 1px solid #ddd;
  border-radius: 1px;
  width: 80px;
  text-align: center;
  padding: 10px;
  margin: 10px 4px 10px 0;
  cursor: pointer;
  background-color: #f9f9f9;
  transition: border-color .2s ease-in-out, background-color .2s, box-shadow .2s;
}

.numbers div:hover {
  background-color: #f1f1f1;
  -webkit-box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
  box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
  border-color: #bbb;
}

.numbers div:active {
  font-weight: bold;
}

div.equal {
  display: inline-block;
  border: 1px solid #3079ED;
  border-radius: 1px;
  width: 17%;
  text-align: center;
  padding: 127px 10px;
  margin: 10px 6px 10px 0;
  vertical-align: top;
  cursor: pointer;
  color: #FFF;
  background-color: #4d90fe;
  transition: all .2s ease-in-out;
}

div.equal:hover {
  background-color: #307CF9;
  -webkit-box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
  box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
  border-color: #1857BB;
}

div.equal:active {
  font-weight: bold;
}

Now, the main method to perform the operations for this used javascript format when the user click any number to perform the operations and will get a result so here the javascript code:

"use strict";

var input = document.getElementById('input'), // input/output button
  number = document.querySelectorAll('.numbers div'), // number buttons
  operator = document.querySelectorAll('.operators div'), // operator buttons
  result = document.getElementById('result'), // equal button
  clear = document.getElementById('clear'), // clear button
  resultDisplayed = false; // flag to keep an eye on what output is displayed

// adding click handlers to number buttons
for (var i = 0; i < number.length; i++) {
  number[i].addEventListener("click", function(e) {

    // storing current input string and its last character in variables - used later
    var currentString = input.innerHTML;
    var lastChar = currentString[currentString.length - 1];

    // if result is not diplayed, just keep adding
    if (resultDisplayed === false) {
      input.innerHTML += e.target.innerHTML;
    } else if (resultDisplayed === true && lastChar === "+" || lastChar === "-" || lastChar === "×" || lastChar === "÷") {
      // if result is currently displayed and user pressed an operator
      // we need to keep on adding to the string for next operation
      resultDisplayed = false;
      input.innerHTML += e.target.innerHTML;
    } else {
      // if result is currently displayed and user pressed a number
      // we need clear the input string and add the new input to start the new opration
      resultDisplayed = false;
      input.innerHTML = "";
      input.innerHTML += e.target.innerHTML;
    }

  });
}

// adding click handlers to number buttons
for (var i = 0; i < operator.length; i++) {
  operator[i].addEventListener("click", function(e) {

    // storing current input string and its last character in variables - used later
    var currentString = input.innerHTML;
    var lastChar = currentString[currentString.length - 1];

    // if last character entered is an operator, replace it with the currently pressed one
    if (lastChar === "+" || lastChar === "-" || lastChar === "×" || lastChar === "÷") {
      var newString = currentString.substring(0, currentString.length - 1) + e.target.innerHTML;
      input.innerHTML = newString;
    } else if (currentString.length == 0) {
      // if first key pressed is an opearator, don't do anything
      console.log("enter a number first");
    } else {
      // else just add the operator pressed to the input
      input.innerHTML += e.target.innerHTML;
    }

  });
}

// on click of 'equal' button
result.addEventListener("click", function() {

  // this is the string that we will be processing eg. -10+26+33-56*34/23
  var inputString = input.innerHTML;

  // forming an array of numbers. eg for above string it will be: numbers = ["10", "26", "33", "56", "34", "23"]
  var numbers = inputString.split(/\+|\-|\×|\÷/g);

  // forming an array of operators. for above string it will be: operators = ["+", "+", "-", "*", "/"]
  // first we replace all the numbers and dot with empty string and then split
  var operators = inputString.replace(/[0-9]|\./g, "").split("");

  console.log(inputString);
  console.log(operators);
  console.log(numbers);
  console.log("----------------------------");

  // now we are looping through the array and doing one operation at a time.
  // first divide, then multiply, then subtraction and then addition
  // as we move we are alterning the original numbers and operators array
  // the final element remaining in the array will be the output

  var divide = operators.indexOf("÷");
  while (divide != -1) {
    numbers.splice(divide, 2, numbers[divide] / numbers[divide + 1]);
    operators.splice(divide, 1);
    divide = operators.indexOf("÷");
  }

  var multiply = operators.indexOf("×");
  while (multiply != -1) {
    numbers.splice(multiply, 2, numbers[multiply] * numbers[multiply + 1]);
    operators.splice(multiply, 1);
    multiply = operators.indexOf("×");
  }

  var subtract = operators.indexOf("-");
  while (subtract != -1) {
    numbers.splice(subtract, 2, numbers[subtract] - numbers[subtract + 1]);
    operators.splice(subtract, 1);
    subtract = operators.indexOf("-");
  }

  var add = operators.indexOf("+");
  while (add != -1) {
    // using parseFloat is necessary, otherwise it will result in string concatenation :)
    numbers.splice(add, 2, parseFloat(numbers[add]) + parseFloat(numbers[add + 1]));
    operators.splice(add, 1);
    add = operators.indexOf("+");
  }

  input.innerHTML = numbers[0]; // displaying the output

  resultDisplayed = true; // turning flag if result is displayed
});

// clearing the input on press of clear
clear.addEventListener("click", function() {
  input.innerHTML = "";
})

Now complete code with css and javascript embeded into the index.html and that are placed before the head tag using style tag for css and script tag for javascript:

<!DOCTYPE html>
<html>
<head>
<title>Java Script Calculator</title>
<style>
body {
  width: 500px;
  margin: 4% auto;
  font-family: 'Source Sans Pro', sans-serif;
  letter-spacing: 5px;
  font-size: 1.8rem;
  -moz-user-select: none;
  -webkit-user-select: none;
  -ms-user-select: none;
}

.calculator {
  padding: 20px;
  -webkit-box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
  box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
  border-radius: 1px;
}

.input {
  border: 1px solid #ddd;
  border-radius: 1px;
  height: 60px;
  padding-right: 15px;
  padding-top: 10px;
  text-align: right;
  margin-right: 6px;
  font-size: 2.5rem;
  overflow-x: auto;
  transition: all .2s ease-in-out;
}

.input:hover {
  border: 1px solid #bbb;
  -webkit-box-shadow: inset 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
  box-shadow: inset 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
}

.buttons {}

.operators {}

.operators div {
  display: inline-block;
  border: 1px solid #bbb;
  border-radius: 1px;
  width: 80px;
  text-align: center;
  padding: 10px;
  margin: 20px 4px 10px 0;
  cursor: pointer;
  background-color: #ddd;
  transition: border-color .2s ease-in-out, background-color .2s, box-shadow .2s;
}

.operators div:hover {
  background-color: #ddd;
  -webkit-box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
  box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
  border-color: #aaa;
}

.operators div:active {
  font-weight: bold;
}

.leftPanel {
  display: inline-block;
}

.numbers div {
  display: inline-block;
  border: 1px solid #ddd;
  border-radius: 1px;
  width: 80px;
  text-align: center;
  padding: 10px;
  margin: 10px 4px 10px 0;
  cursor: pointer;
  background-color: #f9f9f9;
  transition: border-color .2s ease-in-out, background-color .2s, box-shadow .2s;
}

.numbers div:hover {
  background-color: #f1f1f1;
  -webkit-box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
  box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
  border-color: #bbb;
}

.numbers div:active {
  font-weight: bold;
}

div.equal {
  display: inline-block;
  border: 1px solid #3079ED;
  border-radius: 1px;
  width: 17%;
  text-align: center;
  padding: 127px 10px;
  margin: 10px 6px 10px 0;
  vertical-align: top;
  cursor: pointer;
  color: #FFF;
  background-color: #4d90fe;
  transition: all .2s ease-in-out;
}

div.equal:hover {
  background-color: #307CF9;
  -webkit-box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
  box-shadow: 0px 1px 4px 0px rgba(0, 0, 0, 0.2);
  border-color: #1857BB;
}

div.equal:active {
  font-weight: bold;
}
</syle>
<script>
"use strict";

var input = document.getElementById('input'), // input/output button
  number = document.querySelectorAll('.numbers div'), // number buttons
  operator = document.querySelectorAll('.operators div'), // operator buttons
  result = document.getElementById('result'), // equal button
  clear = document.getElementById('clear'), // clear button
  resultDisplayed = false; // flag to keep an eye on what output is displayed

// adding click handlers to number buttons
for (var i = 0; i < number.length; i++) {
  number[i].addEventListener("click", function(e) {

    // storing current input string and its last character in variables - used later
    var currentString = input.innerHTML;
    var lastChar = currentString[currentString.length - 1];

    // if result is not diplayed, just keep adding
    if (resultDisplayed === false) {
      input.innerHTML += e.target.innerHTML;
    } else if (resultDisplayed === true && lastChar === "+" || lastChar === "-" || lastChar === "×" || lastChar === "÷") {
      // if result is currently displayed and user pressed an operator
      // we need to keep on adding to the string for next operation
      resultDisplayed = false;
      input.innerHTML += e.target.innerHTML;
    } else {
      // if result is currently displayed and user pressed a number
      // we need clear the input string and add the new input to start the new opration
      resultDisplayed = false;
      input.innerHTML = "";
      input.innerHTML += e.target.innerHTML;
    }

  });
}

// adding click handlers to number buttons
for (var i = 0; i < operator.length; i++) {
  operator[i].addEventListener("click", function(e) {

    // storing current input string and its last character in variables - used later
    var currentString = input.innerHTML;
    var lastChar = currentString[currentString.length - 1];

    // if last character entered is an operator, replace it with the currently pressed one
    if (lastChar === "+" || lastChar === "-" || lastChar === "×" || lastChar === "÷") {
      var newString = currentString.substring(0, currentString.length - 1) + e.target.innerHTML;
      input.innerHTML = newString;
    } else if (currentString.length == 0) {
      // if first key pressed is an opearator, don't do anything
      console.log("enter a number first");
    } else {
      // else just add the operator pressed to the input
      input.innerHTML += e.target.innerHTML;
    }

  });
}

// on click of 'equal' button
result.addEventListener("click", function() {

  // this is the string that we will be processing eg. -10+26+33-56*34/23
  var inputString = input.innerHTML;

  // forming an array of numbers. eg for above string it will be: numbers = ["10", "26", "33", "56", "34", "23"]
  var numbers = inputString.split(/\+|\-|\×|\÷/g);

  // forming an array of operators. for above string it will be: operators = ["+", "+", "-", "*", "/"]
  // first we replace all the numbers and dot with empty string and then split
  var operators = inputString.replace(/[0-9]|\./g, "").split("");

  console.log(inputString);
  console.log(operators);
  console.log(numbers);
  console.log("----------------------------");

  // now we are looping through the array and doing one operation at a time.
  // first divide, then multiply, then subtraction and then addition
  // as we move we are alterning the original numbers and operators array
  // the final element remaining in the array will be the output

  var divide = operators.indexOf("÷");
  while (divide != -1) {
    numbers.splice(divide, 2, numbers[divide] / numbers[divide + 1]);
    operators.splice(divide, 1);
    divide = operators.indexOf("÷");
  }

  var multiply = operators.indexOf("×");
  while (multiply != -1) {
    numbers.splice(multiply, 2, numbers[multiply] * numbers[multiply + 1]);
    operators.splice(multiply, 1);
    multiply = operators.indexOf("×");
  }

  var subtract = operators.indexOf("-");
  while (subtract != -1) {
    numbers.splice(subtract, 2, numbers[subtract] - numbers[subtract + 1]);
    operators.splice(subtract, 1);
    subtract = operators.indexOf("-");
  }

  var add = operators.indexOf("+");
  while (add != -1) {
    // using parseFloat is necessary, otherwise it will result in string concatenation :)
    numbers.splice(add, 2, parseFloat(numbers[add]) + parseFloat(numbers[add + 1]));
    operators.splice(add, 1);
    add = operators.indexOf("+");
  }

  input.innerHTML = numbers[0]; // displaying the output

  resultDisplayed = true; // turning flag if result is displayed
});

// clearing the input on press of clear
clear.addEventListener("click", function() {
  input.innerHTML = "";
})
</script>
</head>
<body>

<div class="calculator">
  <div class="input" id="input"></div>
  <div class="buttons">
    <div class="operators">
      <div>+</div>
      <div>-</div>
      <div>&times;</div>
      <div>&divide;</div>
    </div>
    <div class="leftPanel">
      <div class="numbers">
        <div>7</div>
        <div>8</div>
        <div>9</div>
      </div>
      <div class="numbers">
        <div>4</div>
        <div>5</div>
        <div>6</div>
      </div>
      <div class="numbers">
        <div>1</div>
        <div>2</div>
        <div>3</div>
      </div>
      <div class="numbers">
        <div>0</div>
        <div>.</div>
        <div id="clear">C</div>
      </div>
    </div>
    <div class="equal" id="result">=</div>
  </div>
</div>

</body>
</html>

Copy the whole code and save the file as index.html and run the HTML page on the browser, the output will look like this:

Kindly note if you want you can call the css file and javascript file on html like save the css file as style.css and for javascript main.js and placed the following code before the head tag:

<link rel="stylesheet" href="styles.css">
<script type="text/javascript" src="main.js"></script>
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