83 строки
2.7 KiB
JavaScript
83 строки
2.7 KiB
JavaScript
require("../env");
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var vows = require("vows"),
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assert = require("assert");
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var suite = vows.describe("selection.datum");
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suite.addBatch({
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"select(body)": {
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topic: function() {
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return d3.select("body").html("");
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},
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"updates the data according to the specified function": function(body) {
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body.data([42]).datum(function(d, i) { return d + i; });
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assert.equal(document.body.__data__, 42);
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},
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"updates the data to the specified constant": function(body) {
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body.datum(43);
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assert.equal(document.body.__data__, 43);
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},
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"deletes the data if the function returns null": function(body) {
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body.data([42]).datum(function() { return null; });
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assert.isFalse("__data__" in document.body);
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},
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"deletes the data if the constant is null": function(body) {
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body.data([42]).datum(null);
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assert.isFalse("__data__" in document.body);
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},
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"returns the current selection": function(body) {
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assert.isTrue(body.datum(function() { return 1; }) === body);
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assert.isTrue(body.datum(2) === body);
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},
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"with no arguments, returns the first node's datum": function(body) {
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body.data([42]);
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assert.equal(body.datum(), 42);
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}
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}
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});
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suite.addBatch({
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"selectAll(div)": {
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topic: function() {
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return d3.select("body").html("").selectAll("div").data(d3.range(2)).enter().append("div");
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},
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"updates the data according to the specified function": function(div) {
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div.data([42, 43]).datum(function(d, i) { return d + i; });
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assert.equal(div[0][0].__data__, 42);
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assert.equal(div[0][1].__data__, 44);
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},
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"updates the data to the specified constant": function(div) {
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div.datum(44);
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assert.equal(div[0][0].__data__, 44);
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assert.equal(div[0][1].__data__, 44);
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},
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"deletes the data if the function returns null": function(div) {
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div.datum(function() { return null; });
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assert.isFalse("__data__" in div[0][0]);
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assert.isFalse("__data__" in div[0][1]);
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},
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"deletes the data if the constant is null": function(div) {
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div.datum(null);
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assert.isFalse("__data__" in div[0][0]);
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assert.isFalse("__data__" in div[0][1]);
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},
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"returns the current selection": function(div) {
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assert.isTrue(div.datum(function() { return 1; }) === div);
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assert.isTrue(div.datum(2) === div);
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},
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"ignores null nodes": function(div) {
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var some = d3.selectAll("div").data([42, 43]);
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some[0][1] = null;
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some.datum(function() { return 1; });
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assert.equal(div[0][0].__data__, 1);
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assert.equal(div[0][1].__data__, 43);
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some.datum(2);
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assert.equal(div[0][0].__data__, 2);
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assert.equal(div[0][1].__data__, 43);
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}
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}
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});
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suite.export(module);
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