【发布时间】：2018-04-10 00:42:52
【问题描述】：
我对 Chart.js 还很陌生，我尝试了很多不同的方法，但我似乎无法解决将 JSON 中的数据加载到条形图表中的问题。
我正在尝试使用最新版本的 Chart.js 显示每月费用图表。
JSON字符串如下：
[{"month":"Jan","amount":"0.00"},{"month":"Feb","amount":"0.00"},{"month":"Mar","amount":"100.00"},{"month":"Apr","amount":"0.00"},{"month":"May","amount":"0.00"},{"month":"Jun","amount":"977.00"},{"month":"Jul","amount":"0.00"},{"month":"Aug","amount":"0.00"},{"month":"Sep","amount":"0.00"},{"month":"Oct","amount":"0.00"},{"month":"Nov","amount":"0.00"},{"month":"Dec","amount":"0.00"}]
我的代码如下：
$(function () {
var chartColors = {
red: 'rgba(255, 99, 132, 1)',
blue: 'rgba(54, 162, 235, 1)',
yellow: 'rgba(255, 205, 86, 1)',
green: 'rgba(75, 192, 192, 1)',
purple: 'rgba(153, 102, 255, 1)',
orange: 'rgba(255, 159, 64, 1)',
darkgrey: 'rgba(102, 102, 102, 1)',
maroon: 'rgba(200, 112, 91, 1)',
khaki: 'rgba(190, 204, 200, 1)'
};
if( $("#ChartExpenseBar").length > 0 ){
$.ajax({
type: 'POST',
url: '/expenses/',
data: {'expense_chart': 'monthly'},
success: function(data) {
var months = [];
var amount = [];
for (var i in data) {
months.push(data[i].month);
amount.push(data[i].amount);
}
var ctx = document.getElementById("ChartExpenseBar").getContext('2d');
var myChart = new Chart(ctx, {
type: 'bar',
data: {
//labels: ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"],
labels: months,
datasets: [{
label: 'Monthly expenses',
backgroundColor: [
chartColors.red,
chartColors.blue,
chartColors.yellow,
chartColors.purple,
chartColors.green,
chartColors.orange,
chartColors.red,
chartColors.blue,
chartColors.yellow,
chartColors.purple,
chartColors.green,
chartColors.orange
],
borderColor: [
chartColors.red,
chartColors.blue,
chartColors.yellow,
chartColors.purple,
chartColors.green,
chartColors.orange,
chartColors.red,
chartColors.blue,
chartColors.yellow,
chartColors.purple,
chartColors.green,
chartColors.orange
],
borderWidth: 1,
data: amount
}]
},
options: {
responsive: true,
maintainAspectRatio: false,
tooltips: {
displayColors: false,
callbacks: {
// use label callback to return the desired label
label: function(tooltipItem, data) {
return "£" + tooltipItem.yLabel;
},
// remove title
title: function(tooltipItem, data) {
return;
}
}
},
legend: {
display: false
},
scales: {
xAxes: [{
gridLines: {
display: false
}
}],
yAxes: [{
gridLines: {
display: false
},
ticks: {
beginAtZero:true,
userCallback: function(value, index, values) {
// Convert the number to a string and splite the string every 3 charaters from the end
value = value.toString();
value = value.split(/(?=(?:...)*$)/);
// Convert the array to a string and format the output
value = value.join('.');
return '£' + value;
}
}
}]
}
}
});
},
error: function() {
alert("There is a problem with loading the chart!");
}
});
}
});
我很可能会想象自己做了一些非常愚蠢的事情，导致了一个未定义的错误，我很想看到有人帮助我。
非常感谢，谢谢。
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标签： javascript jquery charts chart.js bar-chart