JavaScript Onclick Fullscreen Image

JavaScript Onclick Fullscreen Image
Code Snippet:Full screen image viewer
Author: Tim Holman
Published: January 19, 2024
Last Updated: January 22, 2024
Downloads: 1,567
License: MIT
Edit Code online: View on CodePen
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This lightweight JavaScript library helps you to view fullscreen image onclick event. It works by allowing users to click on specific elements with the class “demo-image,” and when clicked, the corresponding image is displayed in a fully fullscreen view. This code is helpful for creating an interactive image gallery with full-screen functionality.

Whether you are working on a gallery project or want to integrate a simple solution to zoom view on click event, this code quite fits your needs.

How to Create Javascript Onclick Fullscreen Image

1. Start by creating the HTML structure for your webpage. You’ll need an HTML file that includes the necessary HTML elements, such as the <head> and <body>. Add the following code to the <body> section of your HTML file.

  <header>
    <div class="main">
      <h1> A js library for viewing images in a fully full screen. </h1>
      <h1> Click the images to see it in action!</h1>
    </div>
  </header>
  <section class="demos">
    <!-- Using divs for the demo, for formatting... you can use images if you want!  -->
    <div class="demo-image first" data-image="http://tholman.com/intense-images/img/h1_small.jpg" data-title="Beautiful fields" data-caption="With lots of wheaty puffs. Love those puffs."></div>
    <div class="demo-image second" data-image="http://tholman.com/intense-images/img/v1_small.jpg" data-title="Fantastic cliffs" data-caption="Longing for exploration. Explore me!"></div>
  </section>

  <script>
    window.onload = function() {
    var elements = document.querySelectorAll( '.demo-image' );
    Intense( elements );
    }
  </script>

Inside the <body>, add the images you want to make clickable for full-screen viewing. Use the following format for each image:

2. Now, add the following CSS code to your project. You can customize the CSS styles to match your website’s design. Adjust fonts, colors, and other styles as needed in the CSS section of the code.

* {
  -webkit-font-smoothing: antialiased;
  -moz-box-sizing: border-box;
  box-sizing: border-box; }

html, body {
  font-family: "Ubuntu Mono", monospace;
  margin: 0px;
  height: 100%;
  width: 100%; }

body {
  padding: 20px;
  padding-top: 40px;
  min-width: 600px; }

.main h1 {
  font-weight: normal;
  width: 464px;
  background: #222222;
  color: #fff;
  font-size: 14px;
  height: 55px;
  line-height: 55px;
  margin: auto;
  margin-top: 0px;
  margin-bottom: 20px;
  text-align: center;}

.demos {
  text-align: center;
  margin-top: 20px;
  width: 490px;
  margin: auto;}

.demo-image {
  cursor: url("http://tholman.com/intense-images/img/plus_cursor.png") 25 25, auto;
  display: inline-block;
  width: 220px;
  height: 220px;
  background-size: cover;
  background-position: 50% 50%;
  margin-left: 8px;
  margin-right: 8px;
  margin-bottom: 16px; }
  .demo-image.first {
    background-image: url("http://tholman.com/intense-images/img/h1_small.jpg"); }
  .demo-image.second {
    background-position: 50% 10%;
    background-image: url("http://tholman.com/intense-images/img/v1_small.jpg"); }

footer h1 {
  padding-left: 20px;
  background: #e9e9e9;
  color: #222222;
  font-size: 14px; }
  footer h1 a {
    color: #222222; }

3. Finally, add the following JavaScript code at the end of the <body> section, just before the closing </body> tag.

window.requestAnimFrame = (function(){
  return  window.requestAnimationFrame       ||
          window.webkitRequestAnimationFrame ||
          window.mozRequestAnimationFrame    ||
          function( callback ){
            window.setTimeout(callback, 1000 / 60);
          };
})();

window.cancelRequestAnimFrame = ( function() {
    return window.cancelAnimationFrame          ||
        window.webkitCancelRequestAnimationFrame    ||
        window.mozCancelRequestAnimationFrame       ||
        window.oCancelRequestAnimationFrame     ||
        window.msCancelRequestAnimationFrame        ||
        clearTimeout
} )();


var Intense = (function() {

    'use strict';

    var KEYCODE_ESC = 27;

    // Track both the current and destination mouse coordinates
    // Destination coordinates are non-eased actual mouse coordinates
    var mouse = { xCurr:0, yCurr:0, xDest: 0, yDest: 0 };

    var horizontalOrientation = true;

    // Holds the animation frame id.
    var looper;
  
    // Current position of scrolly element
    var lastPosition, currentPosition = 0;
    
    var sourceDimensions, target;
    var targetDimensions = { w: 0, h: 0 };
  
    var container;
    var containerDimensions = { w: 0, h:0 };
    var overflowArea = { x: 0, y: 0 };

    // Overflow variable before screen is locked.
    var overflowValue;

    /* -------------------------
    /*          UTILS
    /* -------------------------*/

    // Soft object augmentation
    function extend( target, source ) {

        for ( var key in source )

            if ( !( key in target ) )

                target[ key ] = source[ key ];

        return target;
    }

    // Applys a dict of css properties to an element
    function applyProperties( target, properties ) {

      for( var key in properties ) {
        target.style[ key ] = properties[ key ];
      }
    }

    // Returns whether target a vertical or horizontal fit in the page.
    // As well as the right fitting width/height of the image.
    function getFit( 

      source ) {

      var heightRatio = window.innerHeight / source.h;

      if( (source.w * heightRatio) > window.innerWidth ) {
        return { w: source.w * heightRatio, h: source.h * heightRatio, fit: true };
      } else {
        var widthRatio = window.innerWidth / source.w;
        return { w: source.w * widthRatio, h: source.h * widthRatio, fit: false };
      }
    }

    /* -------------------------
    /*          APP
    /* -------------------------*/

    function startTracking( passedElements ) {

      var i;

      // If passed an array of elements, assign tracking to all.
      if ( passedElements.length ) {

        // Loop and assign
        for( i = 0; i < passedElements.length; i++ ) {
          track( passedElements[ i ] );
        }

      } else {
          track( passedElements );
      }
    }

    function track( element ) {

      // Element needs a src at minumun.
      if( element.getAttribute( 'data-image') || element.src ) {
        element.addEventListener( 'click', function() {
          init( this );
        }, false );
      }
    }
  
    function start() { 
      loop();
    }
   
    function stop() {
      cancelRequestAnimFrame( looper );
    }

    function loop() {
        looper = requestAnimFrame(loop);
        positionTarget();      
    }

    // Lock scroll on the document body.
    function lockBody() {

      overflowValue = document.body.style.overflow;
      document.body.style.overflow = 'hidden';
    }

    // Unlock scroll on the document body.
    function unlockBody() {
      document.body.style.overflow = overflowValue;
    }

    function createViewer( title, caption ) {

      /*
       *  Container
       */
      var containerProperties = {
        'backgroundColor': 'rgba(0,0,0,0.8)',
        'width': '100%',
        'height': '100%',
        'position': 'fixed',
        'top': '0px',
        'left': '0px',
        'overflow': 'hidden',
        'zIndex': '999999',
        'margin': '0px',
        'webkitTransition': 'opacity 150ms cubic-bezier( 0, 0, .26, 1 )',
        'MozTransition': 'opacity 150ms cubic-bezier( 0, 0, .26, 1 )',
        'transition': 'opacity 150ms cubic-bezier( 0, 0, .26, 1 )',
        'opacity': '0'
      }
      container = document.createElement( 'figure' );
      container.appendChild( target );
      applyProperties( container, containerProperties );

      var imageProperties = {
        'cursor': 'url( "data:image/png;base64,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" ) 25 25, auto'
      }
      applyProperties( target, imageProperties );

      /*
       *  Caption Container
       */
      var captionContainerProperties = {
        'fontFamily': 'Georgia, Times, "Times New Roman", serif',
        'position': 'fixed',
        'bottom': '0px',
        'left': '0px',
        'padding': '20px',
        'color': '#fff',
        'wordSpacing': '0.2px',
        'webkitFontSmoothing': 'antialiased',
        'textShadow': '-1px 0px 1px rgba(0,0,0,0.4)'
      }
      var captionContainer = document.createElement( 'figcaption' );
      applyProperties( captionContainer, captionContainerProperties );

      /*
       *  Caption Title
       */
      if ( title ) {
        var captionTitleProperties = {
          'margin': '0px',
          'padding': '0px',
          'fontWeight': 'normal',
          'fontSize': '40px',
          'letterSpacing': '0.5px',
          'lineHeight': '35px',
          'textAlign': 'left'
        }
        var captionTitle = document.createElement( 'h1' );
        applyProperties( captionTitle, captionTitleProperties );
        captionTitle.innerHTML = title;
        captionContainer.appendChild( captionTitle );
      }

      if ( caption ) {
        var captionTextProperties = {
          'margin': '0px',
          'padding': '0px',
          'fontWeight': 'normal',
          'fontSize': '20px',
          'letterSpacing': '0.1px',
          'maxWidth': '500px',
          'textAlign': 'left',
          'background': 'none',
          'marginTop': '5px'
        }
        var captionText = document.createElement( 'h2' );
        applyProperties( captionText, captionTextProperties );
        captionText.innerHTML = caption;
        captionContainer.appendChild( captionText );
      }

      container.appendChild( captionContainer );

      setDimensions();

      mouse.xCurr = mouse.xDest = window.innerWidth / 2;
      mouse.yCurr = mouse.yDest = window.innerHeight / 2;
      
      document.body.appendChild( container );
      setTimeout( function() {
        container.style[ 'opacity' ] = '1';
      }, 10);
    }

    function removeViewer() {

      unlockBody();
      unbindEvents();
      document.body.removeChild( container );
    }

    function setDimensions() {

      // Manually set height to stop bug where 
      var imageDimensions = getFit( sourceDimensions );
      target.width = imageDimensions.w;
      target.height = imageDimensions.h;
      horizontalOrientation = imageDimensions.fit;

      targetDimensions = { w: target.width, h: target.height };
      containerDimensions = { w: window.innerWidth, h: window.innerHeight };
      overflowArea = {x: containerDimensions.w - targetDimensions.w, y: containerDimensions.h - targetDimensions.h};

    }

    function init( element ) {

      var imageSource = element.getAttribute( 'data-image') || element.src;
      var title = element.getAttribute( 'data-title');
      var caption = element.getAttribute( 'data-caption');
      
      var img = new Image();
      img.onload = function() {

        sourceDimensions = { w: img.width, h: img.height }; // Save original dimensions for later.
        target = this;
        createViewer( title, caption );
        lockBody();
        bindEvents();
        loop();
      }

      img.src = imageSource;
    }

    function bindEvents() {

      container.addEventListener( 'mousemove', onMouseMove,   false );
      container.addEventListener( 'touchmove', onTouchMove,   false );
      window.addEventListener(    'resize',    setDimensions, false );
      window.addEventListener(    'keyup',     onKeyUp,       false );
      target.addEventListener(    'click',     removeViewer,  false );
    }

    function unbindEvents() {

      container.removeEventListener( 'mousemove', onMouseMove,   false );
      container.removeEventListener( 'touchmove', onTouchMove,   false);
      window.removeEventListener(    'resize',    setDimensions, false );
      window.removeEventListener(    'keyup',     onKeyUp,       false );
      target.removeEventListener(    'click',     removeViewer,  false )
    }
  
    function onMouseMove( event ) {

      mouse.xDest = event.clientX;
      mouse.yDest = event.clientY;
    }

    function onTouchMove( event ) {

      event.preventDefault(); // Needed to keep this event firing.
      mouse.xDest = event.touches[0].clientX;
      mouse.yDest = event.touches[0].clientY;
    }

    // Exit on excape key pressed;
    function onKeyUp( event ) {

      event.preventDefault();
      if ( event.keyCode === KEYCODE_ESC ) {
        removeViewer();
      } 
    }
  
    function positionTarget() {

      mouse.xCurr += ( mouse.xDest - mouse.xCurr ) * 0.05;
      mouse.yCurr += ( mouse.yDest - mouse.yCurr ) * 0.05;

      if ( horizontalOrientation === true ) {

        // HORIZONTAL SCANNING
        currentPosition += ( mouse.xCurr - currentPosition );
        if( mouse.xCurr !== lastPosition ) {
          var position = parseFloat( currentPosition / containerDimensions.w );
          position = overflowArea.x * position;
          target.style[ 'webkitTransform' ] = 'translate3d(' + position + 'px, 0px, 0px)';
          target.style[ 'MozTransform' ] = 'translate3d(' + position + 'px, 0px, 0px)';
          target.style[ 'msTransform' ] = 'translate3d(' + position + 'px, 0px, 0px)';
          lastPosition = mouse.xCurr;
        }
      } else if ( horizontalOrientation === false ) {

        // VERTICAL SCANNING
        currentPosition += ( mouse.yCurr - currentPosition );
        if( mouse.yCurr !== lastPosition ) {
          var position = parseFloat( currentPosition / containerDimensions.h );
          position = overflowArea.y * position;
          target.style[ 'webkitTransform' ] = 'translate3d( 0px, ' + position + 'px, 0px)';
          target.style[ 'MozTransform' ] = 'translate3d( 0px, ' + position + 'px, 0px)';
          target.style[ 'msTransform' ] = 'translate3d( 0px, ' + position + 'px, 0px)';
          lastPosition = mouse.yCurr;
        }
      }
    }

    function main( element ) {

      // Parse arguments

      if ( !element ) {
        throw 'You need to pass an element!';
      }

      startTracking( element );
    }

    return extend( main, {
        resize: setDimensions,
        start: start,
        stop: stop
    });

})();

That’s it! You’ve successfully implemented a full-screen image viewer on your website using JavaScript. Users can now click on images to enjoy a more immersive viewing experience. Feel free to further customize the code and integrate it into your projects to enhance user engagement with visual content.

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