使用新数据更新d3图表 [英] Making a d3 chart update with new data
问题描述
我有 jsFiddle图表的示例,其中包含多个组的多行。它成功绘制,但我想能够转换到新的数据集。
I have an example of a chart on jsFiddle which has multiple groups of multiple lines. It draws successfully, but I would like to be able to transition to new sets of data.
示例应该在4秒后更新为新数据。
The example should update with new data after 4 seconds. Although the chart gets called (and outputs something in the console), the lines aren't updated.
我已经尝试了很多基于现有的简单示例的变体,没有运气。我怀疑其嵌套数据基于此SO
I've tried lots of variations based on existing, simpler examples, with no luck. I suspect its the nested data based on this SO answer that's confusing me even more than usual.
SO坚持我有一些代码在答案,所以这里我假设我需要添加/更改的东西:
SO insists I have some code in the answer, so here's where I assume I need to add/change something:
svg.transition().attr({ width: width, height: height });
g.attr('transform', 'translate(' + margin.left +','+ margin.right + ')');
var lines = g.selectAll("g.lines").data(function(d) { return d; });
lines.enter().append("g").attr("class", "lines");
lines.selectAll("path.line.imports")
.data(function(d) { return [d.values]; })
.enter().append("path").attr('class', 'line imports');
lines.selectAll('path.line.imports')
.data(function(d) { return [d.values]; })
.transition()
.attr("d", function(d) { return imports_line(d); });
// repeated for path.line.exports with exports_line(d).
推荐答案
问题是, -level g
所有内容附加到的元素:
The problem is the way you're determining the top-level g
element that everything is appended to:
var g = svg.enter().append('svg').append('g');
只有在没有SVG时才会设置,因为你只处理输入选择。如果存在, g
将为空,因此不会发生任何事。要修复,请事后显式选择 g
:
This will only be set if there is no SVG already, as you're only handling the enter selection. If it exists, g
will be empty and therefore nothing will happen. To fix, select the g
explicitly afterwards:
var g = svg.enter().append('svg').append('g').attr("class", "main");
g = svg.select("g.main");
完成演示此处。
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