我有一个基于 this example 的日/小时热图。我正在尝试编写 updateHeatMap 方法,以便可以使用新数据动态更新热图。
我正在使用几个教程中建议的输入/更新/退出方法,这是我注意到的行为。我打开页面,数据就在那里,太棒了。我更新数据,它的元素更少,所以旧元素消失,这正是我想要的。我再次用新元素更新数据,但它们没有出现,这不是我想要的。
initHeatMap函数仅在加载时调用一次,updateHeatMap函数在每次更新数据时调用。
我稍微更改了原始的日/小时热图示例,如下所示:
$scope.heatMapData = $http.get(...
$scope.initHeatMap = function() {
$scope.margin = { top: 50, right: 0, bottom: 100, left: 30 },
width = 960 - margin.left - margin.right,
height = 430 - margin.top - margin.bottom,
gridSize = Math.floor(width / 24),
legendElementWidth = gridSize*2,
buckets = 9,
colors = ["#ffffd9","#edf8b1","#c7e9b4","#7fcdbb","#41b6c4","#1d91c0","#225ea8","#253494","#081d58"], // alternatively colorbrewer.YlGnBu[9]
days = ["Mo", "Tu", "We", "Th", "Fr", "Sa", "Su"],
times = ["1a", "2a", "3a", "4a", "5a", "6a", "7a", "8a", "9a", "10a", "11a", "12a", "1p", "2p", "3p", "4p", "5p", "6p", "7p", "8p", "9p", "10p", "11p", "12p"];
$scope.colorScale = d3.scale.quantile()
.domain([0, buckets - 1, d3.max($scope.heatMapData, function (d) { return d.value; })])
.range(colors);
var svg = d3.select("#heatmap").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 + ")");
var dayLabels = svg.selectAll(".dayLabel")
.data(days)
.enter().append("text")
.text(function (d) { return d; })
.attr("x", 0)
.attr("y", function (d, i) { return i * gridSize; })
.style("text-anchor", "end")
.attr("transform", "translate(-6," + gridSize / 1.5 + ")")
.attr("class", function (d, i) { return ((i >= 0 && i <= 4) ? "dayLabel mono axis axis-workweek" : "dayLabel mono axis"); });
var timeLabels = svg.selectAll(".timeLabel")
.data(times)
.enter().append("text")
.text(function(d) { return d; })
.attr("x", function(d, i) { return i * gridSize; })
.attr("y", 0)
.style("text-anchor", "middle")
.attr("transform", "translate(" + gridSize / 2 + ", -6)")
.attr("class", function(d, i) { return ((i >= 7 && i <= 16) ? "timeLabel mono axis axis-worktime" : "timeLabel mono axis"); });
var heatMap = svg.selectAll(".hour")
.data($scope.heatMapData)
.enter().append("rect")
.attr("x", function(d) { return (d.hour - 1) * gridSize; })
.attr("y", function(d) { return (d.day - 1) * gridSize; })
.attr("rx", 4)
.attr("ry", 4)
.attr("class", "hour bordered")
.attr("width", gridSize)
.attr("height", gridSize)
.style("fill", colors[0]);
heatMap.transition().duration(1000)
.style("fill", function(d) { return $scope.colorScale(d.value); });
heatMap.append("title").text(function(d) { return d.value; });
var legend = svg.selectAll(".legend")
.data([0].concat($scope.colorScale.quantiles()), function(d) { return d; })
.enter().append("g")
.attr("class", "legend");
legend.append("rect")
.attr("x", function(d, i) { return legendElementWidth * i; })
.attr("y", height)
.attr("width", legendElementWidth)
.attr("height", gridSize / 2)
.style("fill", function(d, i) { return colors[i]; });
legend.append("text")
.attr("class", "mono")
.text(function(d) { return "≥ " + Math.round(d); })
.attr("x", function(d, i) { return legendElementWidth * i; })
.attr("y", height + gridSize);
};
更新方法如下:
$scope.rowSelected() = function(){
$http.get(...).then(function(result){
$scope.heatMapData = result.data;
$scope.updateHeatMap();
});
}
$scope.updateHeatMap = function(){
var selection = d3.select("#heatmap");
var heatMap = selection.selectAll(".hour").data($scope.heatMapData);
heatMap.enter().append("rect")
.attr("x", function(d) { return (d.hour - 1) * gridSize; })
.attr("y", function(d) { return (d.day - 1) * gridSize; })
.attr("rx", 4)
.attr("ry", 4)
.attr("class", "hour bordered")
.attr("width", gridSize)
.attr("height", gridSize)
.style("fill", colors[0]);
heatMap.transition().duration(1000)
.style("fill", function(d) {return $scope.colorScale(d.value);});
heatMap.exit().remove();
};
最佳答案
我解决了这个问题。在 initHeatMap 中,svg 元素附加了“g”,然后在该“g”内创建 heatMap 变量。
var svg = d3.select("#heatmap").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 + ")");
var heatMap = svg.selectAll(".hour")...
因此,当我更新热图时,我需要先选择“g”,然后再添加数据。
这是解决方案:
var heatMap = selection.selectAll('g').selectAll(".hour")...
关于javascript - D3.js 输入/更新/退出未按预期添加元素,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/32747811/