How to show height on a div while resizing it dynamically

Question

I want to know how the Javascript code below is working.

I tried this one on javascript but it shows me error. I got this code from : http://interactjs.io/ (Resizing).

I just want to show height on div while resizing vertically. The code is below:

 interact('.resize-drag') .draggable({ onmove: window.dragMoveListener }) .resizable({ edges: { left: true, right: true, bottom: true, top: true } }) .on('resizemove', function(event) { var target = event.target, x = (parseFloat(target.getAttribute('data-x')) || 0), y = (parseFloat(target.getAttribute('data-y')) || 0); // update the element's style target.style.width = event.rect.width + 'px'; target.style.height = event.rect.height + 'px'; // translate when resizing from top or left edges x += event.deltaRect.left; y += event.deltaRect.top; target.style.webkitTransform = target.style.transform = 'translate(' + x + 'px,' + y + 'px)'; target.setAttribute('data-x', x); target.setAttribute('data-y', y); target.textContent = event.rect.width + '×' + event.rect.height; }); 

 .resize-drag { background-color: #29e; color: white; font-size: 20px; font-family: sans-serif; border-radius: 8px; padding: 20px; margin: 30px 20px; width: 120px; /* This makes things *much* easier */ box-sizing: border-box; } .resize-container { width: 100%; height: 240px; } 

 <div class="resize-container"> <div class="resize-drag"> Resize from any edge or corner </div> </div> 

Answer 1

在顶部包括：

<script src="http://code.interactjs.io/interact-1.2.5.min.js" type="text/javascript"></script>