Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

JavaScript

Babel is required to process package imports. If you need a different preprocessor remove all packages first.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Behavior

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML

              
                <div id="root"></div>



              
            
!

CSS

              
                @import url("https://fonts.googleapis.com/css?family=Righteous|Roboto+Mono");

.App {
  background-color: white;
  background-image: url("https://images.unsplash.com/photo-1526376043067-5af36c35cd6c?ixlib=rb-0.3.5&ixid=eyJhcHBfaWQiOjEyMDd9&s=aed342eea1c8593563be90e10c423dfe&auto=format&fit=crop&w=1639&q=80");
  background-size: cover;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  min-height: 800px;
}
.calculator {
   height: auto;
  /*width: 300px; */
  background-color: #2a3a6f;
  padding: 20px;
  display: flex;
  align-items: center;
  flex-direction: column;
  border-radius: 10px;
  box-shadow: inset 0px 2px 20px 5px rgba(0, 0, 0, 0.705),
    2px 10px 50px 2px #2a3a6f;
}

#result-wrapper {
  background-color: gray;
  margin-top: 10px;
  margin-bottom: 20px;
  width: 100%;

  border-radius: 10px;
  height: 80px;
  border: solid black 2px;
  box-shadow: inset 2px 1px 5px 0px black;
  /* padding: 2px 5px 2px 5px; */
}

#display {
  color: white;
  background-color: transparent;
  text-align: right;
  font-size: 2.25em;
  font-family: "Roboto Mono", monospace;
  border-color: transparent;

  width: 320px;
  height: 1.5em;
}

#history {
  color: #eee;
  width: 100%;
  height: 1em;
  padding-left: 5px;
  padding-bottom: 5px;
  font-family: "Roboto Mono", monospace;
}

#keypad {
  /* display: flex; */
  height: 100%;
  width: 300px;
  background-color: rgb(53, 108, 156);
  padding: 1px;
  border-radius: 3px;
  box-shadow: 0 0 10px 1px black, inset 0 0 10px 1px rgb(82, 81, 81);
}

#digit-wrapper {
  display: inline;
  float: left;
  /* height: 75%; */
  width: 75%;
  display: flex;
  flex-wrap: wrap;
  align-content: space-between;
  background-color: transparent;
}

button {
  font-family: "Righteous", cursive;
  font-size: 1.5em;
  color: #4d4d4e;
}

#op-wrapper {
  display: inline;
  float: right;
  width: 25%;
  /* height: 100%; */
  /* background-color: aquamarine; */
  text-align: center;
}
#mod-wrapper {
  display: inline-block;
  /* background: grey; */
  width: 75%;
  /* height: 100%; */
}

.btn-digits {
  width: 75px;
  height: 75px;
  border-radius: 5px;
  border: solid black 1px;
  box-shadow: inset 2px 1px 20px 0px black;
}

#zero {
  width: 150px;
}

.btn-operators {
  width: 75px;
  height: 75px;
  background-color: rgb(199, 77, 40);
  color: antiquewhite;
  border-radius: 5px;
  border: solid black 2px;
  box-shadow: inset 2px 1px 20px 0px black;
}

.btn-modifiers {
  width: 75px;
  height: 75px;
  background-color: rgb(183, 199, 40);
  border-radius: 5px;
  border: solid black 2px;
  box-shadow: inset 2px 1px 20px 0px black;
}

#clear {
  font-size: 1.5em;
}

#backSpace {
  color: black;
  color: red;
  font-size: 1.2em;
}


.footer {
   font-family: "Righteous", cursive;
  width: 100%;
  font-size: 1.75em;
  margin-top: 40px;
  color: #2a3a6f;
  text-align: center;
  text-shadow: 0 2px 20px rgba(51, 51, 51, 0.514);
}
.socialLinks i {
  font-size: 1.25em;
  margin: 0px 10px;
  color: #2a3a6f;
}

.photoCredits {
  font-size: 0.5em;
  line-height: 5px;
  margin-top: 40px;
}
.photoCredits a {
  color: #f55d3e;
  text-decoration: none;
}
              
            
!

JS

              
                

class App extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      display: "0",
      historyText: "",
      historyArr: [],
      currentOp: "",
      rollingValue: 0
    };

    this.handleDigit = this.handleDigit.bind(this);
    this.handleOperand = this.handleOperand.bind(this);
    this.handleClear = this.handleClear.bind(this);
    this.callEqual = this.callEqual.bind(this);
    this.backSpace = this.backSpace.bind(this);
    this.plusMinus = this.plusMinus.bind(this);
  }

  handleDigit(e) {
    const digit = e.target.value;
    const currentHisArr = [...this.state.historyArr];
    const lastIndex = currentHisArr.length === 0 ? 0 : currentHisArr.length - 1;

    if (
      (digit === "." && this.state.display.indexOf(".") === -1) ||
      digit !== "."
    ) {
      if (this.state.display === "0" || this.state.display === "") {
        this.setState({
          display: digit,
          currentOp: "",
          historyArr: [...currentHisArr, digit]
        });
      } else if (this.state.rollingValue !== 0) {

        this.setState({
          display: digit,
          currentOp: "",
          historyArr: [digit],
          rollingValue: 0
        });
      } else {
        let currentVal = currentHisArr[lastIndex] + digit;
        let newArr = [...currentHisArr];
        newArr[lastIndex] = currentVal;
        
        this.setState({
          display: this.state.display + digit,
          currentOp: "",
          historyArr: newArr
        });
        
      }
    }
    setTimeout(() => {
      this.showHistory();
    }, 150);
  }

  backSpace() {

    if (this.state.rollingValue === 0) {
      const currentBackOne = this.state.display.slice(0, -1);
      console.log(currentBackOne);
      const currentHisArr = [...this.state.historyArr];
      const lastIndex =
            currentHisArr.length === 0 ? 0 : currentHisArr.length - 1;
      const replaceArr = [...this.state.historyArr];
      replaceArr[lastIndex] = currentBackOne;
      this.setState({
        display: currentBackOne,
        historyArr: [...replaceArr]
      });
    }
  }

  plusMinus() {

    const curVal = this.state.display;
    const newVal = parseFloat(curVal) * -1;
    console.log(curVal, newVal);
    const currentHisArr = [...this.state.historyArr];
    const lastIndex = currentHisArr.length === 0 ? 0 : currentHisArr.length - 1;
    const replaceArr = [...currentHisArr];
    replaceArr[lastIndex] = newVal;
    console.log(replaceArr);
    this.setState({
      display: newVal,
      historyArr: [...replaceArr],
      historyText: replaceArr.join(" ")
    });
  }

  swapOp() {
    let currentArr = [...this.state.historyArr];
    currentArr.pop();
    return currentArr;
  }

  showHistory() {
    const showHistory = this.state.historyArr.join(" ");
    this.setState({ historyText: showHistory });
  }

  callEqual() {
    const endOfHistArr = this.state.historyArr[
      this.state.historyArr.length - 1
    ];
    const regEx = RegExp("[÷x+-]$");

    if (regEx.test(endOfHistArr)) {

      const valString = this.swapOp()
      .join(" ")
      .replace(/÷/, "/")
      .replace(/x/, "*");

      const newVal = eval(valString);


      this.setState({
        historyText: this.swapOp().join(" "),
        display: newVal,
        rollingValue: newVal,
        historyArr: [newVal]
      });
    } else {

      const valString = [...this.state.historyArr]
      .join(" ")
      .replace(/÷/, "/")
      .replace(/x/, "*");

      const newVal = eval(valString);

      this.setState({
        historyText: valString,
        display: newVal,
        rollingValue: newVal,
        historyArr: [newVal]
      });
    }
  }
  handleOperand(e) {
    const newOp = e.target.value;

    if (this.state.display !== "0") {
      this.state.currentOp === ""
        ? this.setState({
        currentOp: newOp,
        historyArr: [...this.state.historyArr, newOp],
        display: "",
        rollingValue: 0
      })
      : this.setState({
        historyArr: [...this.swapOp(), newOp],
        display: ""
      });

      setTimeout(() => {
        this.showHistory();
      }, 250);
    }
  }

  handleClear() {
    this.setState({
      display: "0",
      historyText: "",
      currentOp: "",
      historyArr: [],
      rollingValue: 0
    });
  }

  handleKeyDown(e) {

    switch (e.key) {
        // key 7
      case "7":
        return document.getElementById("seven").click();
      case "8":
        return document.getElementById("eight").click();
      case "9":
        return document.getElementById("nine").click();
      case "4":
        return document.getElementById("four").click();
      case "5":
        return document.getElementById("five").click();
      case "6":
        return document.getElementById("six").click();
      case "1":
        return document.getElementById("one").click();
      case "2":
        return document.getElementById("two").click();
      case "3":
        return document.getElementById("three").click();
      case "0":
        return document.getElementById("zero").click();
      case ".":
        return document.getElementById("decimal").click();
      case "/":
        return document.getElementById("divide").click();
      case "*":
        return document.getElementById("multiply").click();
      case "-":
        return document.getElementById("subtract").click();
      case "+":
        return document.getElementById("add").click();
      case "Enter":
        return document.getElementById("equals").click();
      case "Backspace":
        return document.getElementById("backSpace").click();
      case "Clear":
        return document.getElementById("clear").click();
      case "Delete":
        return document.getElementById("clear").click();

      default:
        return console.log("default");
    }
  }

  componentWillMount = () => {

    document.addEventListener("keydown", this.handleKeyDown);
  };

render() {
  return (
    <div className="App">
      <div className="calculator">
        <Display
          result={this.state.display}
          historyText={this.state.historyText}
          />
        <Keypad
          handleDigit={this.handleDigit}
          handleClear={this.handleClear}
          handleOperand={this.handleOperand}
          handleEqual={this.callEqual}
          handleBackSpace={this.backSpace}
          handlePlusMinus={this.plusMinus}
          />
      </div>
      <Footer/>
    </div>
  );
}
}

class Display extends React.Component {
  render() {
    return (
      <div id="result-wrapper">
        <Results result={this.props.result} />
        <History historyText={this.props.historyText} />
      </div>
    );
  }
}

class Results extends React.Component {
  render() {
    return <div id="display">{this.props.result}</div>;
  }
}

class History extends React.Component {
  render() {
    return <div id="history"> {this.props.historyText} </div>;
  }
}

class Keypad extends React.Component {
  render() {
    return (
      <div id="keypad">
        <Modifiers
          handleClear={this.props.handleClear}
          handleBackSpace={this.props.handleBackSpace}
          handlePlusMinus={this.props.handlePlusMinus}
          />
        <Operators
          handleOperand={this.props.handleOperand}
          handleEqual={this.props.handleEqual}
          />
        <Digits handleDigit={this.props.handleDigit} />
      </div>
    );
  }
}

class Digits extends React.Component {
  render() {
    return (
      <div id="digit-wrapper">
        <button
          className="btn-digits"
          id="seven"
          value="7"
          onClick={this.props.handleDigit}
          >
          7
        </button>
        <button
          className="btn-digits"
          id="eight"
          value="8"
          onClick={this.props.handleDigit}
          >
          8
        </button>
        <button
          className="btn-digits"
          id="nine"
          value="9"
          onClick={this.props.handleDigit}
          >
          9
        </button>
        <button
          className="btn-digits"
          id="four"
          value="4"
          onClick={this.props.handleDigit}
          >
          4
        </button>
        <button
          className="btn-digits"
          id="five"
          value="5"
          onClick={this.props.handleDigit}
          >
          5
        </button>
        <button
          className="btn-digits"
          id="six"
          value="6"
          onClick={this.props.handleDigit}
          >
          6
        </button>
        <button
          className="btn-digits"
          id="one"
          value="1"
          onClick={this.props.handleDigit}
          >
          1
        </button>
        <button
          className="btn-digits"
          id="two"
          value="2"
          onClick={this.props.handleDigit}
          >
          2
        </button>
        <button
          className="btn-digits"
          id="three"
          value="3"
          onClick={this.props.handleDigit}
          >
          3
        </button>
        <button
          className="btn-digits"
          id="decimal"
          value="."
          onClick={this.props.handleDigit}
          >
          .
        </button>
        <button
          className="btn-digits"
          id="zero"
          value="0"
          onClick={this.props.handleDigit}
          >
          0
        </button>
      </div>
    );
  }
}

class Operators extends React.Component {
  render() {
    return (
      <div id="op-wrapper">
        <button
          className="btn-operators"
          id="divide"
          value="÷"
          onClick={this.props.handleOperand}
          >
          ÷
        </button>
        <button
          className="btn-operators"
          id="multiply"
          value="x"
          onClick={this.props.handleOperand}
          >
          X
        </button>
        <button
          className="btn-operators"
          id="subtract"
          value="-"
          onClick={this.props.handleOperand}
          >
          -
        </button>
        <button
          className="btn-operators"
          id="add"
          value="+"
          onClick={this.props.handleOperand}
          >
          +
        </button>
        <button
          className="btn-operators"
          id="equals"
          value="="
          // onClick={this.props.handleOperand}
          onClick={this.props.handleEqual}
          >
          =
        </button>
      </div>
    );
  }
}

class Modifiers extends React.Component {
  render() {
    return (
      <div id="mod-wrapper">
        <button
          className="btn-modifiers"
          id="clear"
          onClick={this.props.handleClear}
          >
          Clear
        </button>
        <button
          className="btn-modifiers"
          id="backSpace"
          onClick={this.props.handleBackSpace}
          >
          <span role="img" aria-label="plus or minus">
            🔙
          </span>
        </button>
        <button className="btn-modifiers" onClick={this.props.handlePlusMinus}>
          +/-
        </button>
      </div>
    );
  }
}


class Footer extends React.Component {
  render() {
    return (
      <div className="footer">
        <div className="socialLinks">
          <a href="https://github.com/Alba-C" target="_blank">
            <i className="fab fa-github" />
          </a>
                    
          <a href="https://twitter.com/albanesechris" target="_blank">
            <i className="fab fa-twitter" />
          </a>
          
          <a href="https://codepen.io/Alba-C/" target="_blank" > 
            <i className="fab fa-codepen"></i>           
          </a>
        </div>

        <p>© Christopher Albanese 2018</p>
        
        <div className="photoCredits">
         
          <p>
            Background photo by{" "}
            <a
              href="https://unsplash.com/@rawpixel"
              target="_blank"
            >
              rawpixel
            </a>{" "}
            on{" "}
            <a
              href="https://unsplash.com/photos/Dz-lPF200Rg"
              target="_blank"
            >
              Unsplash
            </a>
          </p>

         </div>
      </div>
    );
  }
}



ReactDOM.render(<App />, document.getElementById('root'));


              
            
!
999px

Console