[英]Appended text not showing in d3 v4
我試圖將平行坐標示例 “轉換”為新版本的d3 v4。 我有一個這個javascript的工作示例(如果有人嘗試使用d3的v4並且新功能有問題,這也是一個很好的例子):
var margin = {top: 30, right: 10, bottom: 10, left: 10},
width = 600 - margin.left - margin.right,
height = 200 - margin.top - margin.bottom;
var x = d3.scaleBand().rangeRound([0, width]).padding(1),
y = {},
dragging = {};
var line = d3.line(),
//axis = d3.axisLeft(x),
background,
foreground,
extents;
var svg = d3.select("#body").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
d3.csv("cars.csv", function(error, cars) {
// Extract the list of dimensions and create a scale for each.
//cars[0] contains the header elements, then for all elements in the header
//different than "name" it creates and y axis in a dictionary by variable name
x.domain(dimensions = d3.keys(cars[0]).filter(function(d) {
if(d == "name") {
return false;
}
return y[d] = d3.scaleLinear()
.domain(d3.extent(cars, function(p) {
return +p[d]; }))
.range([height, 0]);
}));
extents = dimensions.map(function(p) { return [0,0]; });
// Add grey background lines for context.
background = svg.append("g")
.attr("class", "background")
.selectAll("path")
.data(cars)
.enter().append("path")
.attr("d", path);
// Add blue foreground lines for focus.
foreground = svg.append("g")
.attr("class", "foreground")
.selectAll("path")
.data(cars)
.enter().append("path")
.attr("d", path);
// Add a group element for each dimension.
var g = svg.selectAll(".dimension")
.data(dimensions)
.enter().append("g")
.attr("class", "dimension")
.attr("transform", function(d) { return "translate(" + x(d) + ")"; })
.call(d3.drag()
.subject(function(d) { return {x: x(d)}; })
.on("start", function(d) {
dragging[d] = x(d);
background.attr("visibility", "hidden");
})
.on("drag", function(d) {
dragging[d] = Math.min(width, Math.max(0, d3.event.x));
foreground.attr("d", path);
dimensions.sort(function(a, b) { return position(a) - position(b); });
x.domain(dimensions);
g.attr("transform", function(d) { return "translate(" + position(d) + ")"; })
})
.on("end", function(d) {
delete dragging[d];
transition(d3.select(this)).attr("transform", "translate(" + x(d) + ")");
transition(foreground).attr("d", path);
background
.attr("d", path)
.transition()
.delay(500)
.duration(0)
.attr("visibility", null);
}));
// Add an axis and title.
g.append("g")
.attr("class", "axis")
.each(function(d) { d3.select(this).call(d3.axisLeft(y[d]));})
//text does not show up because previous line breaks somehow
.append("text")
.style("text-anchor", "middle")
.attr("y", -9)
.text(function(d) { return d; });
// Add and store a brush for each axis.
g.append("g")
.attr("class", "brush")
.each(function(d) {
d3.select(this).call(y[d].brush = d3.brushY().extent([[-8, 0], [8,height]]).on("brush start", brushstart).on("brush", brush_parallel_chart));
})
.selectAll("rect")
.attr("x", -8)
.attr("width", 16);
});
function position(d) {
var v = dragging[d];
return v == null ? x(d) : v;
}
function transition(g) {
return g.transition().duration(500);
}
// Returns the path for a given data point.
function path(d) {
return line(dimensions.map(function(p) { return [position(p), y[p](d[p])]; }));
}
function brushstart() {
d3.event.sourceEvent.stopPropagation();
}
// Handles a brush event, toggling the display of foreground lines.
function brush_parallel_chart() {
for(var i=0;i<dimensions.length;++i){
if(d3.event.target==y[dimensions[i]].brush) {
extents[i]=d3.event.selection.map(y[dimensions[i]].invert,y[dimensions[i]]);
}
}
foreground.style("display", function(d) {
return dimensions.every(function(p, i) {
if(extents[i][0]==0 && extents[i][0]==0) {
return true;
}
return extents[i][1] <= d[p] && d[p] <= extents[i][0];
}) ? null : "none";
});
}
一切正常(刷在每個軸上,改變軸的順序......),除了每個軸頂部的標簽沒有顯示,即使附加了文本標簽並且文本寫在tag(可以通過使用瀏覽器檢查生成的html來檢查)。 我相信負責這個的代碼就是這個部分,但是我無法找到發生這種情況的原因:
g.append("g")
.attr("class", "axis")
.each(function(d) { d3.select(this).call(d3.axisLeft(y[d]));})
//text does not show up because previous line breaks somehow
.append("text")
.style("text-anchor", "middle")
.attr("y", -9)
.text(function(d) { return d; });
為什么文本標簽不顯示?
在D3 v4中 ,軸組件將在其所要求的選擇上明確地將填充設置為none
。 從源代碼 :
selection.filter(entering)
.attr("fill", "none") // <=== Fill set to none by D3
.attr("font-size", 10)
.attr("font-family", "sans-serif")
.attr("text-anchor", orient === right ? "start" : orient === left ? "end" : "middle");
這將創建以下代碼:
與v3生成的代碼形成對比:
<text>
元素將繼承這些屬性,因為它們是這些組的子元素,從而隱藏文本。
要顯示您需要明確設置標簽的標簽,可以這樣做
通過CSS:
.axis text { fill:black; /* <== Set the fill */ text-shadow: 0 1px 0 #fff, 1px 0 0 #fff, 0 -1px 0 #fff, -1px 0 0 #fff; cursor: move; }
工作演示 。
通過在<text>
元素本身上設置fill
屬性:
.append("text") .attr("fill", "black") // <=== Set the fill // .style("fill", "black") // Will also work when using .style() .style("text-anchor", "middle") .attr("y", -9) .text(function(d) { return d; });
工作演示 。
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