我是D3的新手，也是Javascript的新手。我的条形图按原样工作，但是当我添加任何注释掉的代码块试图添加工具提示时，而不是条形图顶部的工具提示渲染，我只得到条形渲染以及颜色填充过渡。 x轴，y轴和条形内的文本消失。我在这里做错了什么？
<script>
var employees = []
employees[0] = { name: "Bob", age: 31 }
employees[1] = { name: "Doug", age: 22 }
employees[2] = { name: "Christine", age: 58 }
employees[3] = { name: "Sarah", age: 40 }
var width = 700;
var height = 800;
//create scales
var widthScale = d3.scale.linear()
.domain([0, 58])
.range([0, width]);
var yScale = d3.scale.ordinal()
.domain(['200,000', '175,000', '150,000', '125,000', '100,000', '75,000', '50,000', '25,000', '0'])
.rangePoints([0, 300]);
//create axis using scales
var xAxis = d3.svg.axis()
.ticks(10)
.tickSize(2)
.scale(widthScale);
var yAxis = d3.svg.axis()
.orient('left')
.tickSize(2)
.scale(yScale)
//colorscale for bar color transition
var colorScale = d3.scale.linear()
.domain([0, 58])
.range(["green", "yellow"]);
//tooltip------------------------------------------------
var tooltip = d3.select("body")
.append("div")
.attr("class", "mytooltip")
.style("position", "absolute")
.style("background", "white")
.style("opacity", "0")
.style("display", "none");
//create canvas
var canvas = d3.select("body")
.append("svg")
.attr("width", width)
.attr("height", height)
.append("g") //create a group
.attr("transform", "translate(150, 15)") //right, down
//create bars & add bars to canvas using data
var bars = canvas.selectAll("rect")
.data(employees)
.enter()
.append("rect")
.attr("y", function (d, i) { return i * 25; })
.attr("width", 0)
.attr("height", 20)
.transition()
.delay(function (d, i) { return i * 100; })
.duration(600)
.attr("width", function (d) { return widthScale(d.age); })
.attr("height", 20)
.attr("fill", function (d) { return colorScale(d.age); })
.attr("y", function (d, i) { return i * 25; })
//add tooltip--------------------------------------------------
//.on('mouseover', function (d) {
// tooltip.transition()
// .style('opacity', .8)
// tooltip.html(d)
// .style('left', (d3.event.pageX - 35) + 'px')
// .style('top', (d3.event.pageY - 30) + 'px')
// });
//add text to bars
canvas.selectAll("text")
.data(employees)
.enter()
.append("text")
.attr("fill", "black")
.attr("y", function (d, i) { return i * 25 + 14; })
.text(function (d) { return d.name });
//append a group to canvas, transform & place xAxis on canvas
canvas.append("g")
.attr("transform", "translate(0, 300)")
.call(xAxis);
//append a group to canvas, transform & place yAxis on canvas
canvas.append("g")
.attr("transform", "translate(0, 0)")
.call(yAxis);
//add tooltip-------------------------------------------
//canvas.append("g")
// .on("mouseover", function (d) {
// d3.select(this)
// .transition()
// .duration(500)
// .attr("x", function (d) { return x(d.age) - 30; })
// .style("cursor", "pointer")
// });
</script>
答案 0 :(得分：1)
将鼠标监听器应用于条形图并使用css opacity显示/隐藏工具提示div。
var employees = [{
name: "Bob",
age: 31
}, {
name: "Doug",
age: 22
}, {
name: "Sarah",
age: 40
}];
var width = 700;
var height = 800;
//create scales
var widthScale = d3.scale.linear()
.domain([0, 58])
.range([0, width]);
var yScale = d3.scale.ordinal()
.domain(['200,000', '175,000', '150,000', '125,000', '100,000', '75,000', '50,000', '25,000', '0'])
.rangePoints([0, 300]);
//create axis using scales
var xAxis = d3.svg.axis()
.ticks(10)
.tickSize(2)
.scale(widthScale);
var yAxis = d3.svg.axis()
.orient('left')
.tickSize(2)
.scale(yScale)
//colorscale for bar color transition
var colorScale = d3.scale.linear()
.domain([0, 58])
.range(["green", "yellow"]);
//add tooltip------------------------------------------------
var tooltip = d3.select("body")
.append("div")
.attr("class", "d3-tip")
.style("position", "absolute")
.style("opacity", 0);
//create canvas
var canvas = d3.select("body")
.append("svg")
.attr("width", width)
.attr("height", height)
.append("g") //create a group
.attr("transform", "translate(150, 15)") //right, down
//create bars & add bars to canvas using data
var bars = canvas.selectAll(".bar")
.data(employees)
.enter()
.append("g")
.attr("class","bar");
bars.append("rect")
.attr("y", function(d, i) {
return i * 25;
})
.attr("width", 0)
.attr("height", 20)
.transition()
.delay(function(d, i) {
return i * 100;
})
.duration(600)
.attr("width", function(d) {
return widthScale(d.age);
})
.attr("height", 20)
.attr("fill", function(d) {
return colorScale(d.age);
})
.attr("y", function(d, i) {
return i * 25;
});
//add text to bars
bars.selectAll("text")
.data(employees)
.enter()
.append("text")
.attr("fill", "black")
.attr("y", function(d, i) {
return i * 25 + 14;
})
.text(function(d) {
return d.name
});
//append a group to canvas, transform & place xAxis on canvas
canvas.append("g")
.attr("transform", "translate(0, 300)")
.call(xAxis);
//append a group to canvas, transform & place yAxis on canvas
canvas.append("g")
.attr("transform", "translate(0, 0)")
.call(yAxis);
//show/hide tooltip-------------------------------------------
canvas.selectAll(".bar")
.on("mouseover", function(d) {
var pos = d3.mouse(this);
console.log(pos);
tooltip
.transition()
.duration(500)
.style("opacity", 1)
.style("left", d3.event.x + "px")
.style("top", d3.event.y + "px")
.text(d.name);
})
.on("mouseout", function() {
tooltip.style("opacity", 0);
});.d3-tip {
line-height: 1;
font-weight: bold;
padding: 12px;
background: rgba(0, 0, 0, 0.8);
color: #fff;
border-radius: 2px;
}<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>