我有一个d3图表，它是从某些json生成的，而json又是由php生成的。所有这一切都运行良好 - PHP正确格式化json和图表正确显示。可以看到here，我包括以下javascript部分的完整代码：
var margin = {top: 50, right: 150, bottom: 50, left: 150},
w = 2500 - margin.left - margin.right,
h = 500 - margin.top - margin.bottom;
var json = <?php echo $json; ?>;
console.log(json);
d3.json("MM_chart.json", function(error, json) {
if (error) throw error;
var items = json.items;
var locations = json.locations;
var directions = json.stage_directions;
console.log(items);
console.log(locations);
console.log(directions);
var stage_directions = ([44, 49, 114, 140, 209, 217, 249, 257, 265, 277, 305, 334, 358, 381, 398, 409, 440, 470, 491, 547, 555, 564, 572, 587, 614, 630, 640, 691, 704, 725, 743, 775, 793, 818, 823, 841, 845, 868, 872, 888, 902, 910, 920, 925, 963, 993, 1005, 1023, 1031, 1047, 1061, 1096, 1125, 1133, 1143, 1178, 1210, 1228, 1281, 1293, 1336, 1349, 1376, 1395, 1439, 1446, 1454, 1538, 1554, 1562, 1578, 1598, 1610, 1618, 1642, 1646, 1716, 1725, 1743, 1781, 1791, 1797, 1843, 1863, 1887, 1915, 1923, 1939 ,1972, 1989, 2019, 2031, 2039, 2045, 2073, 2085, 2101, 2123]);
var x = d3.scale.linear()
.domain([0, 2200])
.range([0, w]);
var y = d3.scale.ordinal()
.domain(locations.map(function(d) {return d["location"];}))
.rangeBands([0, h]);
var yAxis = d3.svg.axis()
.scale(y)
.orient("left");
var xAxis = d3.svg.axis()
.scale(x)
.orient("bottom");
var tip = d3.tip()
.attr('class', 'd3-tip')
.offset([-10, 0])
.html(function(d, i) {return console.log(d.line_text) + "<strong>(" + d.starting_line + ")</strong> <i>" + d.character + "</i>: " + d.line_text;});
var stage_tip = d3.tip()
.attr('class', 'd3-tip')
.offset([-10, 0])
.html(function(d, i) {return console.log(d.direction_text) + "<strong>(" + d.line_after + ") s.d.</strong> <i>" + d.direction_text;});
var svg = d3.select("body").append("svg")
.attr("width", w + margin.left + margin.right)
.attr("height", h + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
svg.append("text")
.attr("transform", "translate(" + (w / 2) + " ," + (h + margin.bottom - 5) +")")
.style("text-anchor", "middle")
.text("Line Number");
var stage_bars = svg.selectAll(".stage_bar")
.data(directions)
.enter()
.append("rect")
.attr("class", "overlay")
.attr("class", function(d, i) {return "stage_bar " + d.direction_text;})
.attr("x", function(d, i) {return d.line_after;})
.attr("width", 1)
.attr("height", h)
.style("fill", "black")
.style("opacity",0.3)
.call(stage_tip)
.on('mouseover', stage_tip.show)
.on('mouseout',stage_tip.hide);
svg.append("rect")
.attr("class", "overlay")
.attr("x",1)
.attr("width", 1133)
.attr("height", h)
.style ("fill", "red")
.style ("opacity", 0.1);
svg.append("rect")
.attr("class", "overlay")
.attr("x",1133)
.attr("width", 857)
.attr("height", h)
.style ("fill", "yellow")
.style ("opacity", 0.1);
svg.append("rect")
.attr("class", "overlay")
.attr("x",1990)
.attr("width", 134)
.attr("height", h)
.style ("fill", "green")
.style ("opacity", 0.1);
svg.append("rect")
.attr("class", "overlay")
.attr("x",5)
.attr("y", 10)
.attr("width", 485)
.attr("height", 155)
.style ("fill", "aliceblue")
// .style ("opacity", 0.1);
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + h + ")")
.call(xAxis);
svg.append("g")
.attr("class", "y axis")
.call(yAxis)
//.call(bars);
var bars = svg.selectAll(".bar")
.data(items)
.enter()
.append("rect")
.attr("class", function(d, i) {return "bar " + d.character;})
.attr("x", function(d, i) {return d.starting_line;})
.attr("y", function(d, i) {return y(d.location);})
.attr("width", function(d, i) {return d.duration;})
.attr("height", 15)
.style("fill", function(d,i) {return "#" + d.color;})
.call(tip)
.on('mouseover', tip.show)
.on('mouseout', tip.hide);
var listCharacters = d3.set(items.map(function(d) {return d.character})).values();
listColors = [];
listPositions = [];
for (l = 0; l < listCharacters.length; l++) {
for (var key in items) {
if (listCharacters[l] === items[key].character) {
if (listColors.indexOf(items[key].color) > -1) {} else {
listColors.push(items[key].color);
var xlegend = (Math.floor(l / 10) * 100);
var ycounter;
var ylegend;
var oldxlegend;
if (l === 0) {
ycounter = 1;
}
if (ycounter < 10) {
listPositions.push(ycounter * 15);
ycounter++;
} else {
listPositions.push(ycounter * 15);
ycounter = 1;
}
}
} else {}
}
}
console.log(listCharacters);
console.log(listColors);
console.log(listPositions);
var legend = svg.selectAll(".legend")
.data(listCharacters)
.enter().append("g")
.attr("class", "legend")
.attr("transform", function(d, i) { return "translate(" + (Math.floor(i / 10) * 105) + ", " + listPositions[i] + ")"; })
legend.append("rect")
.attr("x", 10)
.attr("width", 10)
.attr("height", 10)
.attr("fill", function(d,i) {return "#" + listColors[i];});
legend.append("text")
.attr("x", 22)
.attr("y", 5)
.attr("dy", ".35em")
.text(function(d,i){ return listCharacters[i]});
svg.append("g")
.attr("class", "legend")
.call(legend)
});
我的问题是我想要包含两个工具提示，它们是从JSON的两个独立子部分中提取的。工具提示由以下两个var声明定义：
var tip = d3.tip()
.attr('class', 'd3-tip')
.offset([-10, 0])
.html(function(d, i) {return console.log(d.line_text) + "<strong>(" + d.starting_line + ")</strong> <i>" + d.character + "</i>: " + d.line_text;});
var stage_tip = d3.tip()
.attr('class', 'd3-tip')
.offset([-10, 0])
.html(function(d, i) {return console.log(d.direction_text) + "<strong>(" + d.line_after + ") s.d.</strong> <i>" + d.direction_text;});
并在两次调用中声明项目和方向的条形图：
var stage_bars = svg.selectAll(".stage_bar")
.data(directions)
.enter()
.append("rect")
.attr("class", "overlay")
.attr("class", function(d, i) {return "stage_bar " + d.direction_text;})
.attr("x", function(d, i) {return d.line_after;})
.attr("width", 1)
.attr("height", h)
.style("fill", "black")
.style("opacity",0.3)
.call(stage_tip)
.on('mouseover', stage_tip.show)
.on('mouseout',stage_tip.hide);
var bars = svg.selectAll(".bar")
.data(items)
.enter()
.append("rect")
.attr("class", function(d, i) {return "bar " + d.character;})
.attr("x", function(d, i) {return d.starting_line;})
.attr("y", function(d, i) {return y(d.location);})
.attr("width", function(d, i) {return d.duration;})
.attr("height", 15)
.style("fill", function(d,i) {return "#" + d.color;})
.call(tip)
.on('mouseover', tip.show)
.on('mouseout', tip.hide);
我的问题是bar的工具提示（调用提示的工具提示）有效，但stage_bars的工具提示（调用stage-tip的工具提示）不起作用。我认为问题在于我在tip和stage_tip中调用了同一个类，但是将其声明为tip以外的其他内容没有任何区别。
我的问题是如何让两个工具提示都起作用。这甚至可能吗？我已经看过似乎这样做的例子，但代码并不清楚。
答案 0 :(得分：0)
解决方案实际上非常简单。我在svg.append（＆＃34; rect＆＃34;）语句之前声明了stage_bars变量，这意味着指示阶段方向的行低于其他对象。因此，鼠标永远不会将鼠标悬停在它们上面以触发工具提示。在这些svg.append语句解决了问题后，将var声明移动到某个位置。