erkal/README.md

## README.md

      
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              README.md
            
          
    waitAndEval

A simple mechanism for step by step illustrations.
You can use it in aa loop: waitAndEval II
See also playButton.

  
## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<title>waitAndEval</title>
<style>
#messageText{
  font-size: 60px;
  text-anchor: middle;
}
</style>
<body>
<script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
<script>

// ----------------------------------------------------------------------

var width = 960,
    height = 500;

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

var messageText = svg.append("text")
    .attr("id", "messageText")
    .attr("x", width/2)
    .attr("y", height/2);

var waitAndEval = newWaitAndEval();
write("this text will stay here 8 secs");
waitAndEval(function() { write("8 seconds have passed"); }, 8000);
waitAndEval(function() { write("4 more seconds have passed"); }, 4000);
waitAndEval(function() { write("2 more seconds have passed"); }, 2000);

function write (text) { messageText.attr("class", text).text(text) }

function newWaitAndEval () {
  var t = 0;
  return function (foo, dur) {
    t += dur
    setTimeout(foo, t)
  };
}

</script>
	<!DOCTYPE html>
	<meta charset="utf-8">
	<title>waitAndEval</title>
	<style>
	#messageText{
	font-size: 60px;
	text-anchor: middle;
	}
	</style>
	<body>
	<script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
	<script>

	// ----------------------------------------------------------------------

	var width = 960,
	height = 500;

	var svg = d3.select("body").append("svg")
	.attr("width", width)
	.attr("height", height);

	var messageText = svg.append("text")
	.attr("id", "messageText")
	.attr("x", width/2)
	.attr("y", height/2);

	var waitAndEval = newWaitAndEval();
	write("this text will stay here 8 secs");
	waitAndEval(function() { write("8 seconds have passed"); }, 8000);
	waitAndEval(function() { write("4 more seconds have passed"); }, 4000);
	waitAndEval(function() { write("2 more seconds have passed"); }, 2000);

	function write (text) { messageText.attr("class", text).text(text) }

	function newWaitAndEval () {
	var t = 0;
	return function (foo, dur) {
	t += dur
	setTimeout(foo, t)
	};
	}

	</script>
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