Chartjs 是一个非常出色的开源工具，但我对我尝试创建的条形图有一个快速的问题。鉴于此图表数据:
var chartData = {
labels : labels,
datasets :[
{
fillColor : "rgba(220,220,220,0.5)",
strokeColor : "rgba(220,220,220,0.8)",
highlightFill: "rgba(220,220,220,0.75)",
highlightStroke: "rgba(220,220,220,1)",
scaleOverride: true,
scaleSteps: 9,
data : values
}
]
}
我曾希望图表将以 10 的最高值绘制，无论是否有 10 的任何值。我认为 scaleOverride 和 scaleSteps 可以实现这一点。
是否有可能获得该输出？我浏览了文档，没有看到任何其他明显的设置选项。
更新
让它工作。我的原始帖子底部没有包含 javascript 函数。
<div class="barChartTest" id="rating_12229" onload="drawChart();">
<input type="hidden" class="rating-component" comp-name="test1" comp-value="6"/>
<input type="hidden" class="rating-component" comp-name="test2" comp-value="7"/>
<input type="hidden" class="rating-component" comp-name="test3" comp-value="6"/>
<input type="hidden" class="rating-component" comp-name="test4" comp-value="5"/>
<input type="hidden" class="rating-component" comp-name="test5" comp-value="1"/>
</div>
<canvas id="rating_12229" width="50" height="20"></canvas>
这是我的 javascript:
function buildRatingChartData(ratingId){
var comps = document.getElementById(ratingId).getElementsByClassName("rating-component");
var labels = [];
var values = [];
for(var i=0; i<comps.length; i++){
labels.push(comps[i].getAttribute("comp-name"));
values.push(comps[i].getAttribute("comp-value"));
}
var chartData = {
labels : labels,
datasets :[
{
scale: 10,
fillColor : "rgba(220,220,220,0.5)",
strokeColor : "rgba(220,220,220,0.8)",
highlightFill: "rgba(220,220,220,0.75)",
highlightStroke: "rgba(220,220,220,1)",
scaleOverride:true,
scaleSteps:9,
scaleStartValue:0,
scaleStepWidth:1,
data : values
}
]
}
return chartData;
}
这是我添加这些选项并获得我想要的输出的地方:
function drawCharts(){
var ratings = document.getElementsByClassName("brewRatingData");
for(var i=0; i<ratings.length; i++){
var ratingId = ratings[i].getAttribute("id");
var canvasId = ratingId.replace("brewRating", "coffeeBarChart");
var brewChartData = buildRatingChartData(ratingId);
var ctx = document.getElementById(canvasId).getContext("2d");
window.myBar = new Chart(ctx).Bar(brewChartData, {
responsive : true,
scaleOverride:true,
scaleSteps:10,
scaleStartValue:0,
scaleStepWidth:1,
});
}
}
最佳答案
还包括 scaleStartValue 和 scaleStepWidth，如 docs 中所述。
示例
此示例创建一个 Y 轴从 0 开始到 900 结束的条形图。为此，步长设置为 100，步长数设置为 9。
HTML
<!DOCTYPE html>
<html lang="en">
<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/1.0.2/Chart.min.js"></script>
<meta charset="utf-8">
<title>JS Bin</title>
</head>
<body>
<canvas id="income" width="600" height="400"></canvas>
</body>
</html>
JS
var barData = {
labels : ["January","February","March","April","May","June"],
datasets : [
{
fillColor : "#48A497",
strokeColor : "#48A4D1",
data : [456,479,324,569,702,600]
},
{
fillColor : "rgba(73,188,170,0.4)",
strokeColor : "rgba(72,174,209,0.4)",
data : [364,504,605,400,345,320]
}
]
};
var income = document.getElementById("income").getContext("2d");
new Chart(income).Bar(barData, {
animation:false,
scaleOverride:true,
scaleSteps:9,
scaleStartValue:0,
scaleStepWidth:100
});
关于javascript - 图表 : how to set custom scale in bar chart，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31632967/