我正在使用Charts.JS创建堆积条形图,看起来相当不错:
然而,我需要的是每个条形图完全填充网格,绿色值是百分比,而不是绝对值,红色值以相同的方式为100% - 无论%绿色值是。
IOW,对于上面屏幕截图中显示的值,我需要每个条形图遍历整个宽度,并使用顶部栏作为示例,文本"标记为"在绿色部分应该是" 99%"
" 99%"标签应取代" 17,724"和" 170"应该完全消失。
这是目前使用的数据:
var priceComplianceData = {
labels: [
"Bix Produce", "Capitol City", "Charlies Portland", "Costa Fruit and Produce",
"Get Fresh Sales",
"Loffredo East", "Loffredo West", "Paragon", "Piazza Produce"
],
datasets: [
{
label: "Price Compliant",
backgroundColor: "rgba(34,139,34,0.5)",
hoverBackgroundColor: "rgba(34,139,34,1)",
data: [17724, 5565, 3806, 5925, 5721, 6635, 14080, 9027, 25553]
},
{
label: "Non-Compliant",
backgroundColor: "rgba(255, 0, 0, 0.5)",
hoverBackgroundColor: "rgba(255, 0, 0, 1)",
// The vals below have been multiplied by 10 (a 0 appended) so that the values are at least visible to the naked eye
data: [170, 10, 180, 140, 30, 10, 50, 100, 10]
}
]
}
...然后将其添加到图表中:
var priceComplianceOptions = {
scales: {
xAxes: [
{
stacked: true
}
],
yAxes: [
{
stacked: true
}
]
},
tooltips: {
enabled: false
}
};
var ctxBarChart = $("#priceComplianceBarChart").get(0).getContext("2d");
var priceBarChart = new Chart(ctxBarChart,
{
type: 'horizontalBar',
data: priceComplianceData,
options: priceComplianceOptions
});
想到的是改变数据:
datasets: [
{
label: "Price Compliant",
backgroundColor: "rgba(34,139,34,0.5)",
hoverBackgroundColor: "rgba(34,139,34,1)",
data: [99.0, 99.2, 99.4, 98.9, 99.1, 99.5, 99.6, 99.2, 99.7]
},
{
label: "Non-Compliant",
backgroundColor: "rgba(255, 0, 0, 0.5)",
hoverBackgroundColor: "rgba(255, 0, 0, 1)",
data: [1.0, 0.8, 0.6, 1.1, 0.9, 0.5, 0.4, 0.8, 0.3]
}
]
...然后使用第一个数据值作为标记绿色部分的数据值,附加"%"它。
这是一种明智的做法吗?还有更好的方法吗?
提议的beforeInit / afterDraw不起作用;导致我或多或少可接受的图表:
......为了得到更多的麻烦而不是一个干草窝消防站:
...即使我将其添加为两个函数中的第一行:
if (chartInstance.id !== 1) return;
答案 0 :(得分:3)
你的想法实际上非常好,但正如你在问题中宣称的那样,它不会是动态的,然后不会对这种类型的每个图表起作用。
使其动态化的一种方法是使用Chart.js plugins来处理beforeInit
事件,以编辑数据以适应您的百分比问题,以及处理afterDraw
事件的位置在栏上写下百分比:
Chart.pluginService.register({
// This event helps to edit the data in our datasets to fit a percentage scale
beforeInit: function(chartInstance) {
// We first get the total of datasets for every data
var totals = [];
chartInstance.data.datasets.forEach(function(dataset) {
for (var i = 0; i < dataset.data.length; i++) {
var total = 0;
chartInstance.data.datasets.forEach(function(dataset) {
total += dataset.data[i];
});
totals.push(total);
}
});
// And use it to calculate the percentage of the current data
chartInstance.data.datasets.forEach(function(dataset) {
for (var i = 0; i < dataset.data.length; i++) {
// This ----------¬ is useful to add it as a string in the dataset
// It solves V the problem of values with `.0` at decimals
dataset.data[i] = '' + (dataset.data[i] / totals[i]) * 100;
}
});
},
// This event allows us to add the percentage on the bar
afterDraw: function(chartInstance) {
// We get the canvas context
var ctx = chartInstance.chart.ctx;
// And set the properties we need
ctx.font = Chart.helpers.fontString(14, 'bold', Chart.defaults.global.defaultFontFamily);
ctx.textAlign = 'center';
ctx.textBaseline = 'bottom';
ctx.fillStyle = '#666';
// For every dataset ...
chartInstance.data.datasets.forEach(function(dataset) {
// If it is not the first dataset, we return now (no action)
if (dataset._meta[0].controller.index != 0) return;
// For ervery data in the dataset ...
for (var i = 0; i < dataset.data.length; i++) {
// We get the model of the data
var model = dataset._meta[Object.keys(dataset._meta)[0]].data[i]._model;
// And use it to display the text where we want
ctx.fillText(parseFloat(dataset.data[i]).toFixed(2) + "%", ((model.base + model.x) / 2), (model.y + model.height / 3));
}
});
}
});
<小时/> 您可以看到此代码正常工作on this jsFiddle,结果如下: