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. You can use the CSS from another Pen by using it's URL and the proper URL extention.

+ add another resource

JavaScript

Babel includes JSX processing.

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

Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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

              
                #zzButtonProgress

              
            
!

CSS

              
                @import url("https://fonts.googleapis.com/css?family=Raleway:400,400i,700");

body {
  font-family: Raleway, sans-serif;
  background-color: #424242;
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.zz-button-progress {
  $full-background-color: #2f8aff;
  $empty-background-color: #085dc9;
  --progress: 100%;
  color: #ffffff;
  font-family: inherit;
	font-weight: bold;
  background-color: $full-background-color;
  background-image: linear-gradient(
    to top,
    $full-background-color 0 var(--progress),
    $empty-background-color var(--progress) 100%
  );
	border: 0;
	outline: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
	cursor: pointer;
  border-top-left-radius: 20% 50%;
  border-top-right-radius: 20% 50%;
  border-bottom-left-radius: 20% 50%;
  border-bottom-right-radius: 20% 50%;
  span {
    font-family: inherit;
  }
}

.zz-check {
  --width: 0px;
  --height: 0px;
  --thickness: 0px;
  --left-height: 0%;
  --bottom-width: 0%;
  width: var(--width);
  height: var(--height);
  display: none;
  position: absolute;
  top: calc(50% - calc(var(--height) / 2));
  left: calc(50% - calc(var(--width) / 2));
  transform: translateY(-25%) rotate(-45deg);
  &:before, &:after {
    content: "";
    background-color: #ffffff;
    display: block;
    position: absolute;
  }
  &:before {
    width: var(--thickness);
    height: var(--left-height);
    top: 0;
    left: 0;
  }
  &:after {
    width: var(--bottom-width);
    height: var(--thickness);
    bottom: 0;
    left: 0;
  }
}

              
            
!

JS

              
                import React, { useState } from "https://cdn.skypack.dev/react@17.0.1";
import ReactDOM from "https://cdn.skypack.dev/react-dom@17.0.1";
import gsap from "https://cdn.skypack.dev/gsap@3.6.1";

// Constants
const START_DURATION = 0.75;
const END_DURATION = 1;

// GSAP timeline
const tl = gsap.timeline();
  
/**
 * Start animation for ZZ Button Progress
 */
function animateZzButtonProgressStart(elms, props, sizeAvg, callback) {
  // The button will become circle
  tl.to(elms.buttonElm, {
    width: `${sizeAvg}px`,
    height: `${sizeAvg}px`,
    borderTopLeftRadius: "50%",
    borderTopRightRadius: "50%",
    borderBottomLeftRadius: "50%",
    borderBottomRightRadius: "50%",
    ease: "elastic.out(1.75, 0.3)",
    duration: START_DURATION
  });
  
  // Make the text size of 'upload' button smaller
  tl.to(elms.uploadTextElm, {
    fontSize: `${parseInt(props.fontSize) / 2}px`,
    ease: "elastic.out(1.75, 0.3)",
    duration: START_DURATION,
  }, "-=" + START_DURATION);
  
  // Make the text size of progress count larger
  tl.to(elms.progressTextElm, {
    fontSize: `${parseInt(props.fontSize) * 1.5}px`,
    ease: "elastic.out(1.75, 0.3)",
    duration: START_DURATION,
  }, "-=" + START_DURATION);
  
  // Darken the background color of the button
  tl.to(elms.buttonElm, {
    "--progress": "0%",
    ease: "power2.out",
    duration: START_DURATION,
    onComplete() {
      callback();
    }
  }, "-=" + START_DURATION);
}

/**
 * End animation for ZZ Button Progress
 */
function animateZzButtonProgressEnd(elms, props, callback) {
  const halfDuration = END_DURATION / 2;
  const quarterDuration = END_DURATION / 4;
  
  // Return to original shape
  tl.to(elms.buttonElm, {
    width: `${props.width}px`,
    height: `${props.height}px`,
    borderTopLeftRadius: "20% 50%",
    borderTopRightRadius: "20% 50%",
    borderBottomLeftRadius: "20% 50%",
    borderBottomRightRadius: "20% 50%",
    ease: "elastic.out(1.75, 0.3)",
    delay: 0.25,
    duration: halfDuration
  });
  
  // Turn into green background
  tl.to(elms.buttonElm, {
    backgroundColor: "#52b500",
    ease: "power2.out",
    duration: halfDuration
  }, "-=" + halfDuration);
  
  // Put the font opacity into transparent
  tl.to(elms.uploadTextElm, {
    opacity: 0,
    ease: "power2.out",
    duration: halfDuration
  }, "-=" + halfDuration);
  
  tl.to(elms.progressTextElm, {
    opacity: 0,
    ease: "power2.out",
    duration: halfDuration
  }, "-=" + halfDuration);
  
  // HACK: Set the background image to none
  //       This is to make background color transition work
  tl.set(elms.buttonElm, {
    backgroundImage: "none"
  }, "-=" + halfDuration);
  
  // Set the display of check container into block
  tl.set(elms.checkElm, {
    display: "block"
  });
  
  // Left check border
  tl.to(elms.checkElm, {
    "--left-height": "100%",
    ease: "elastic.out(2, 0.5)",
    duration: quarterDuration
  });
  
  // Bottom check border
  tl.to(elms.checkElm, {
    "--bottom-width": "100%",
    ease: "elastic.out(2, 0.5)",
    duration: quarterDuration
  });
  
  // HACK: This is to add delay before returning to original state
  tl.to(elms.buttonElm, {
    duration: 2,
    onComplete() {
      // tl.set(elms.buttonElm, {
      //   backgroundColor: "transparent"
      // });
      
      callback();
    }
  });
}

/**
 * ZZ Button Progress JSX Element
 */
function ZzButtonProgress(props) {
  if (isNaN(props.fontSize) || isNaN(props.width) || isNaN(props.height)) {
    return <span>Not seems to be working</span>;
  }
  
  // Flag if the button is clicked
  const [clicked, setClicked] = useState(false);
  
  // Progress count of upload
  const [progressText, setProgressText] = useState(100);
  
  // Get the average value of width and height
  const width = parseInt(props.width);
  const height = parseInt(props.height);
  const sizeAvg = Math.round((width + height) / 2);
  
  // Set the size of the check based on the height
  const checkThickness = height / 10;
  const checkWidth = (height / 2) + checkThickness;
  const checkHeight = (height / 5) + checkThickness;
  
  // Inline style of the upload button itself
  const buttonStyle = {
    "--progress": `${progressText}%`,
    width: `${width}px`,
    height: `${height}px`
  };
  
  // Inline style of the 'Upload' text
  const uploadTextStyle = {
    fontSize: `${props.fontSize}px`
  };
  
  // Inline style of the progress count percentage
  const progressTextStyle = {
    fontSize: `0px`
  };
  
  // Inline style of the 'check' after upload
  const checkStyle = {
    "--width": `${checkWidth}px`,
    "--height": `${checkHeight}px`,
    "--thickness": `${checkThickness}px`
  }
  
  return (
    <button
      className="zz-button-progress"
      style={buttonStyle}
      onClick={evt => {
        if (clicked === true) {
          // Prevent double action
          
          return;
        }
        
        setClicked(true);
        setProgressText(0);
        
        // JSX elements to be animated
        const elms = {
          buttonElm: evt.target,
          uploadTextElm: evt.target.querySelector("span:nth-child(1)"),
          progressTextElm: evt.target.querySelector("span:nth-child(2)"),
          checkElm: evt.target.querySelector(".zz-check")
        };
        
        // Start animation for ZZ Button Progress
        animateZzButtonProgressStart(elms, props, sizeAvg, () => {
          // Callback after 'start' animation
          
          // Initialise the progress used by GSAP
          let progress = {
            count: 0
          };
          
          // Change the progress count using GSAP
          gsap.to(progress, {
            count: 100,
            ease: "circ.inOut",
            duration: 1.5,
            onUpdate() {
              setProgressText(Math.floor(progress.count));
            },
            onComplete() {
              // End animation for ZZ Button Progress
              animateZzButtonProgressEnd(elms, props, () => {
                // Callback after 'end' animation
                
                setClicked(false);

                // Reset the animation to beginning
                tl.progress(0);
                tl.clear();
                
                // HACK: Remove the property of background-image
                gsap.set(elms.buttonElm, {
                  backgroundImage: null
                });
              });
            }
          });
        });
      }}>
        <span
          style={uploadTextStyle}
          onClick={evt => {
            evt.stopPropagation();
            evt.target.parentElement.click();
        }}>
          {props.text}
        </span>
        <span style={progressTextStyle} onClick={evt => { evt.stopPropagation(); }}>
          {progressText}%
        </span>
        <span className="zz-check" style={checkStyle}></span>
      </button>
  );
}

ReactDOM.render(
  <ZzButtonProgress text="Upload" fontSize="32" width="250" height="100" />,
  document.querySelector("#zzButtonProgress")
);

              
            
!
999px

Console