Chart.js使用来自MySQL的json数据
[英]Chart.js using json data from MySQL
问题描述
I am fairly new to Chart.js and I have tried a lot of different ways of doing this but I just can not seem to resolve loading data from JSON in to a bar type chart. 
我对Chart.js相当陌生，我尝试了许多不同的方法来执行此操作，但我似乎无法解决将JSON中的数据加载到条形图中的问题。
I am trying to display a chart of monthly expenses with latest version of Chart.js. 我正在尝试显示Chart.js最新版本的每月费用图表。
The JSON string is as follows: 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"}]
My code is as follows: 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!");
}
});
}
});
I can most likely imagine myself doing something very silly that is causing an undefined error, and I would love to see someone help me please. 我最有可能想象自己做的事情很愚蠢，导致未定义的错误，我很乐意看到有人请我帮忙。
Much appreciated and thank you. 非常感谢，谢谢。
3 个解决方案
解决方案1
1 已采纳 2018-04-10 02:00:33
Your chart does a POST? 您的图表执行POST吗？
Try something along that lines: 尝试以下方法：
$.ajax({
url: '/expenses/',
async: false,
dataType: 'json',
type: "GET",
success: function (d) {
chartData = {
labels: d.AxisLabels,
datasets: [
{
fillColor: "rgba(220,220,220,0.5)",
strokeColor: "rgba(220,220,220,1)",
pointColor: "rgba(220,220,220,1)",
pointStrokeColor: "#fff",
data: d.DataSets[0]
}
]
};
max = Math.max.apply(Math, d.DataSets[0]);
steps = 10;
respondCanvas();
}
});
};
解决方案2
1 2018-04-10 02:51:18
Minimal reproduction of your code seems to indicate that it is working fine, except the 2 options responsive and maintainAspectRatio (they works fine if the chart is contained in a div). 最小程度地复制代码似乎表明它工作正常，除了2个选项responsive和maintainAspectRatio （如果图表包含在div中，则它们工作正常）。 Copy and paste as a new html file into your web server to view. 复制并粘贴为新的html文件到您的Web服务器中进行查看。
Key changes made from your sample code: 根据您的示例代码进行的主要更改：
- AJAX API call changed to GET from ./ AJAX API调用从./更改为GET
- Added fake success data 添加了假的成功数据
Note: responsive and maintainAspectRatio seems to cause the chart to "tremble", unless the chart is wrapped in a div 注： responsive和maintainAspectRatio似乎会导致该图表以“颤抖”，除非图表被包裹在一个div
The problem could lie in elsewhere, maybe in your server response? 问题可能出在其他地方，也许在您的服务器响应中？
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<script
src="https://code.jquery.com/jquery-3.3.1.min.js"
integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8="
crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.2/Chart.bundle.js" integrity="sha256-JG6hsuMjFnQ2spWq0UiaDRJBaarzhFbUxiUTxQDA9Lk=" crossorigin="anonymous"></script>
<div style="width:500px;">
<canvas id="ChartExpenseBar" width="200" height="200"></canvas>
</div>
<script>
$(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: 'GET',
url: './',
data: {'expense_chart': 'monthly'},
success: function(data) {
var months = [];
var amount = [];
// fill with fake data
data = [{"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"}];
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!");
}
});
}
});
</script>
解决方案3
1 2018-04-10 10:42:39
In case anyone finds themselves in a similar position, I have highlighted the answer to the above problem below - thank you to wp78de and Edwin. 万一有人发现自己处于类似的位置，我在下面强调了上述问题的答案-感谢wp78de和Edwin。
$(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 ){
$.ajax({
type: 'GET',
async: false,
dataType: 'json',
url: '/expenses/',
data: {'expense_chart': 'monthly'},
success: function(data) {
var months = [];
var amount = [];
for (var i in data) {
months.push(data[i].month);
amount.push(data[i].amount);
}
var ctx = document.getElementById("ChartExpenseBar").getContext('2d');
var myChart = new Chart(ctx, {
type: 'bar',
data: {
labels: months,
datasets: [{
label: 'Monthly expenses',
backgroundColor: [
chartColors.red,
chartColors.blue,
chartColors.yellow,
chartColors.purple,
chartColors.green,
chartColors.orange,
chartColors.red,
chartColors.blue,
chartColors.yellow,
chartColors.purple,
chartColors.green,
chartColors.orange
],
borderColor: [
chartColors.red,
chartColors.blue,
chartColors.yellow,
chartColors.purple,
chartColors.green,
chartColors.orange,
chartColors.red,
chartColors.blue,
chartColors.yellow,
chartColors.purple,
chartColors.green,
chartColors.orange
],
borderWidth: 1,
data: amount
}]
},
options: {
responsive: true,
maintainAspectRatio: false,
tooltips: {
displayColors: false,
callbacks: {
// use label callback to return the desired label
label: function(tooltipItem, data) {
return "£" + tooltipItem.yLabel;
},
// remove title
title: function(tooltipItem, data) {
return;
}
}
},
legend: {
display: false
},
scales: {
xAxes: [{
gridLines: {
display: false
}
}],
yAxes: [{
gridLines: {
display: false
},
ticks: {
beginAtZero:true,
userCallback: function(value, index, values) {
// Convert the number to a string and splite the string every 3 charaters from the end
value = value.toString();
value = value.split(/(?=(?:...)*$)/);
// 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!");
}
});
}
});
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