Utilizing the CSS transform scale() function to enlarge an element while preserving its entire content and allowing for scrolling

Check out this live example: https://jsfiddle.net/b8vLg0ny/

You can actually utilize the CSS functions scale and translate to magnify an element.

For instance, consider a scenario with 4 boxes arranged in a 2x2 grid.

The HTML code for this setup is as follows:

<div id="container">
  <div id="zoom-container">
    <div class="box red">A</div>
    <div class="box blue">B</div>
    <div class="box green">C</div>
    <div class="box black">D</div>
  </div>
</div>

The corresponding CSS styling is shown below:

* { margin: 0; }

body, html { height: 100%; }

#container {
  height: 100%;
  width: 50%;
  margin: 0 auto;
}

#zoom-container {
  height: 100%;
  width: 100%;
  transition: all 0.2s ease-in-out;
}

.box {
  float: left;
  width: 50%;
  height: 50%;
  color: white;
  text-align: center;
  display: block;
}

.red { background: red; }
.blue { background: blue; }
.green { background: green; }
.black { background: black; }

Finally, the JavaScript section contains the logic for zooming in on a box when clicked.

Feel free to experiment with modifying the values of translateX and translateY to adjust the zoom effect.

If you encounter issues such as content being cropped during zoom, solutions like adjusting transform-origin or adding margins may help alleviate those problems.

Overall, finding a balance between zooming into an element effectively while maintaining proper overflow handling can be challenging but possible with creative solutions.

Answer №1

Is it possible to adjust the TransformOrigin to 0 0 and utilize appropriate scrollTop/scrollLeft after the animation?

If you are not looking for animations, maintaining the TransformOrigin at 0 0 with scrolling can effectively display the box.

To ensure smoother animations, consider using transitions solely for the transform property to prevent unnecessary alteration of the transform-origin. In the updated example with 4x4 elements, zooming a box entirely into view seems more practical. However, if sticking to a zoom level of 2 and grid size of 15x15, precise origin calculation is necessary for transform, followed by accurate scrolling adjustments.

Ultimately, the usefulness of this approach may vary based on your needs.

Stack snippet

var zoomedIn = false;
var zoomContainer = $("#zoom-container");

$(".box").click(function(event) {
  var el = this;
  
  if (zoomedIn) {    
    zoomContainer.css({
    transform: "scale(1)",
      transformOrigin: "0 0"
    });
    zoomContainer.parent().scrollTop(0).scrollLeft(0);
    zoomedIn = false;
    return;
  } 
  zoomedIn = true;
  var $el = $(el);
  animate($el);
  zoomContainer.on('transitionend', function(){
  zoomContainer.off('transitionend');
  reposition($el);
  })
});

var COLS = 4, ROWS = 4, 
  COLS_STEP = 100 / (COLS - 1), ROWS_STEP = 100 / (ROWS - 1),
    ZOOM = 4;
  

function animate($box) {
  var cell = getCell($box);
  var col =  cell.col * COLS_STEP + '%',
      row =  cell.row * ROWS_STEP + '%';
  zoomContainer.parent().css('overflow', 'hidden');
zoomContainer.css({
    transition: 'transform 0.2s ease-in-out',
  transform: "scale(" + ZOOM + ")",
    transformOrigin: col + " " + row
  });
}
function reposition($box) {
  zoomContainer.css({
    transition: 'none',
  transform: "scale(" + ZOOM + ")",
    transformOrigin: '0 0'
  });  
  zoomContainer.parent().css('overflow', 'auto');
  $box.get(0).scrollIntoView();
}
function getCell ($box) {
var idx = $box.index();
  var col = idx % COLS,
      row =  (idx / ROWS) | 0;
  return { col: col, row: row };
}
* { margin: 0; }

body, html { height: 100%; }

#container {
  height: 100%;
  width: 50%;
  margin: 0 auto;
  overflow: hidden;
}

#zoom-container {
  height: 100%;
  width: 100%;
  will-change: transform;
}

.box {
  float: left;
  width: 25%;
  height: 25%;
  color: white;
  text-align: center;  
}

.red { background: red; }
.blue { background: blue; }
.green { background: green; }
.black { background: black; }
.l { opacity: .3 }
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.2.2/jquery.min.js"></script>

<div id="container">
  <div id="zoom-container">
    <div class="box red">A</div>
    <div class="box blue">B</div>
    <div class="box green">C</div>
    <div class="box black">D</div>

    <div class="box red l">E</div>
    <div class="box blue l">F</div>
    <div class="box green l">G</div>
    <div class="box black l">H</div>

    <div class="box red">I</div>
    <div class="box blue">J</div>
    <div class="box green">K</div>
    <div class="box black">L</div>

    <div class="box red l">M</div>
    <div class="box blue l">N</div>
    <div class="box green l">O</div>
    <div class="box black l">P</div>
  </div>
</div>

Answer №2

I have come to the conclusion that achieving this task within the given parameters is highly unlikely, if not impossible. Any potential workaround would likely result in visual issues, such as erratic scrolling caused by animating scrollTop after altering transform-origin to 0, 0 (eliminating cropping by bringing everything back into the container).

I invite someone to challenge my perspective and prove me wrong, but it's akin to requesting scrollLeft = -10, a feat deemed unattainable by MDN. ("If set to a value less than 0 [...], scrollLeft is set to 0.")

If, however, transitioning from scrolling to zooming and panning is acceptable, then the goal can be accomplished: https://jsfiddle.net/jegn4x0f/5/

Below is the solution contextualized within the original problem:

https://i.sstatic.net/IyAiz.gif

HTML:

<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.2.2/jquery.min.js"></script>

<button id="zoom-out">Zoom out</button>

<div id="container">
  <div id="inner-container">
    <div id="zoom-container">
      <div class="box red">A</div>
      <div class="box blue">B</div>
      <div class="box green">C</div>
      <div class="box black">D</div>
    </div>
  </div>
</div>

JavaScript:

//
// credit for the approach goes to
//
//   https://stackoverflow.com/questions/35252249/move-drag-pan-and-zoom-object-image-or-div-in-pure-js#comment58224460_35253567
//
// and the corresponding example:
//
//  https://jsfiddle.net/j8kLz6wm/1/
//

// in a real-world setting, you
// wouldn't keep this information
// on window. this is just for
// the demonstration.
window.zoomedIn = false;
...

CSS:

* {
  margin: 0;
}

body,
html {
  height: 100%;
}

#container {
  height: 100%;
  width: 50%;
  margin: 0 auto;
}

#inner-container {
  width: 100%;
  height: 100%;
}
...

This solution was derived from another query (Move (drag/pan) and zoom object (image or div) in pure js), where adjustments were made to the width and height. However, in my scenario, I need to zoom into a specific element on the page with more boxes arranged in a grid. The provided solution (https://jsfiddle.net/j8kLz6wm/1/) demonstrates the fundamental principle using pure JavaScript. For those utilizing jQuery, jquery.panzoom might suffice.

Answer №3

Update

I encountered an issue with scroll bars not always showing up, so I decided to investigate that part. As a result, the code related to it has been commented out and instead, I have implemented a delay to move the clicked box into view.

If you're interested, you can check out my fiddle demo, which I am using to experiment and find a solution to the scroll bar problem.

On a side note: @AVAVT made a comment mentioning a useful post that might help others as well. You can find the link to his post here, offering an interesting alternative in certain cases.

(function(zoomed) {
  
  $(".box").click(function(event) {
    
    var el = this, elp = el.parentElement;
    
    if (zoomed) {
      zoomed = false;
      $("#zoom-container").css({'transform': ''});
      
    } else {
      zoomed = true;

      $("#zoom-container").css({'transform-origin': '0 0', 'transform': 'scale(2)'});
      
      setTimeout(function() {
        el.scrollIntoView();
      },250);
    }    
  });
})();
* { margin: 0; }

body, html { height: 100%; }

#container {
  height: 100%;
  width: 50%;
  overflow: auto;
  margin: 0 auto;
}

#zoom-container {
  height: 100%;
  width: 100%;
  transition: all 0.2s ease-in-out;
}

.box {
  float: left;
  width: 50%;
  height: 50%;
  color: white;
  text-align: center;
  display: block;
}

.red {
  background: red; 
}
.blue {
  background: blue;
}
.green {
  background: green;
}
.black {
  background: black;
}
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.2.2/jquery.min.js"></script>
<div id="container">
  <div id="zoom-container">
    <div class="box red">A</div>
    <div class="box blue">B</div>
    <div class="box green">C</div>
    <div class="box black">D</div>
  </div>
</div>

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