Click Transition

forked from CoreyBurkhart's block: Click Transition

<!DOCTYPE html>  
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style> 
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
    .circle, .updated {
      fill: red;
    }
  </style>
</head>

<body>
  <script>
    // Feel free to change or delete any of the code you see in this editor!
    var width = 900,
        height = 500,
        data = [50, 100, 150, 200, 250, 300, 350, 400];
    
    var svg = d3.select("body").append("svg")
      .attr("width", width)
      .attr("height", height)
    	.on('click', triggerTransition.bind(this))
    
    var t = d3.transition()
    	.duration(200)
    	.ease(d3.easeLinear)
    
    var g = svg.append('g')
    	.attr('class', 'group')
			.selectAll('.circle')
    	.data(data)
    	.enter()
    	.append('circle')
    	.attr('class', 'circle')
    	.attr('r', 20)
    	.attr('cx', width / 8)
    	.attr('cy', function(d) {return d})	
    
			
    function triggerTransition() {
      	data = [50, 100, 150, 200];
      	d3.selectAll('.circle')
        	.data(data)  // update
        	.attr('class', 'updated')
          .exit() //exit and remove w/ transition
          .transition(t)
        	.delay(function(d, i){return i * 400})
          .attr('cx', 600)
        	.remove()
        
        d3.selectAll('.updated')
          .transition(t)
        	.delay(function(d, i){return i * 200})
        	.style('fill', 'blue') //update data that will stay
//         	.attr('cy', function(d){return d* 2})
    }

</script>
</body>

https://d3js.org/d3.v4.min.js