2010-09-28 22:34:52 +04:00
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<html>
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<head>
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<title>Hello, data!</title>
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Simplify data join. Add insert & empty.
The data join is now specified as a single function of data, as with all other
properties. This allows the key to be computed on the previously-bound data,
rather than requiring the key to be serialized into the DOM (say, as an
attribute). In the case that there is no previously-bound data, it is still
possible to access the associated node as the `this` context.
The `enter` operator no longer performs an append. For symmetry with the `exit`
operator, you must call `append` after obtaining the entering selection. This
requires a tiny bit more code, but should make the code more clear. Also, it
provides an opportunity to use a different instantiation operator, such as the
new `insert` operator. This takes a second argument, which is a selector for the
insert-before reference element. For example, the selector ":first-child" will
prepend nodes.
The `empty` operator allows you to query whether a selection is empty (i.e.,
contains zero matching nodes).
2011-01-31 22:00:35 +03:00
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<script type="text/javascript" src="../../d3.js"></script>
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2010-09-28 22:34:52 +04:00
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<style type="text/css">
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body {
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font: 14px Helvetica Neue;
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text-rendering: optimizeLegibility;
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margin: 1em;
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}
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#cells {
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position: relative;
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margin-top: .5em;
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height: 300px;
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overflow: hidden;
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}
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.cell {
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position: absolute;
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background: steelblue;
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color: white;
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width: 28px;
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text-align: center;
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padding-top: 6px;
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top: 300px;
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bottom: 0;
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background: -webkit-gradient(linear, left top, left bottom, from(transparent), to(steelblue));
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-webkit-transition-property: top, background-color;
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-webkit-transition-duration: 500ms;
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-webkit-transition-timing-function: ease, linear;
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}
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</style>
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</head>
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<body>
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Your lucky numbers are:<br>
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<div id="cells"></div>
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<script type="text/javascript">
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var n = 10;
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d3.select("#cells")
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.selectAll("div")
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2010-10-24 22:43:32 +04:00
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.data(d3.range(n))
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Simplify data join. Add insert & empty.
The data join is now specified as a single function of data, as with all other
properties. This allows the key to be computed on the previously-bound data,
rather than requiring the key to be serialized into the DOM (say, as an
attribute). In the case that there is no previously-bound data, it is still
possible to access the associated node as the `this` context.
The `enter` operator no longer performs an append. For symmetry with the `exit`
operator, you must call `append` after obtaining the entering selection. This
requires a tiny bit more code, but should make the code more clear. Also, it
provides an opportunity to use a different instantiation operator, such as the
new `insert` operator. This takes a second argument, which is a selector for the
insert-before reference element. For example, the selector ":first-child" will
prepend nodes.
The `empty` operator allows you to query whether a selection is empty (i.e.,
contains zero matching nodes).
2011-01-31 22:00:35 +03:00
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.enter().append("div")
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2010-09-28 22:34:52 +04:00
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.attr("class", "cell")
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2010-10-24 22:43:32 +04:00
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.style("left", function(i) { return i * 30; });
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function transform() {
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d3.selectAll(".cell")
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.data(d3.range(n).map(Math.random))
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.style("top", function(d) { return (1 - d) * 300; })
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.style("background-color", function(d) { return "rgb(" + ~~(d * 255) + ",50,100)"; })
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.text(function(d) { return ~~(d * 100); });
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2010-09-28 22:34:52 +04:00
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}
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2010-10-24 22:43:32 +04:00
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window.addEventListener("keypress", transform, false);
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2010-09-28 22:34:52 +04:00
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</script>
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</body>
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</html>
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