你好堆栈溢出程序员，我有一个问题涉及使用ajax从我的数据库获取数据并在chartjs库的饼图中显示它。现在我正在尝试使用饼图格式的格式接受动态数据。
这是我的ajax及其回应:(仍然没有显示我的饼图。我不知道为什么）
function getpieclinic() {
$.ajax({
type: "POST",
url: siteurl+"patients_report/piedataclinic",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: OnSuccess_,
error: OnErrorCall_
});
function OnSuccess_(response) {
// alert("hi");
var aData = response.d;
var arr = [];
$.each(aData, function (inx, val) {
var obj = {};
obj.color = val.color;
obj.value = val.value;
obj.label = val.label;
arr.push(obj);
});
var ctx = $("#myChart").get(0).getContext("2d");
var myPieChart = new Chart(ctx).Pie(arr);
}
function OnErrorCall_(response) {}
}
我的ajax的反应是：
[{"clinic_name":"Clinic 1","total_checked_up":"4"},{"clinic_name":"Clinic 2","total_checked_up":"0"},{"clinic_name":"Clinic 3","total_checked_up":"0"},{"clinic_name":"Clinic 4","total_checked_up":"0"}]
现在，我想制作一个动态格式的饼图chartjs数据格式，以便能够显示它。这是示例中的默认格式：
var pieChartCanvas = $("#pieChart").get(0).getContext("2d");
var pieChart = new Chart(pieChartCanvas);
var PieData = [
{
value: 700,
color: "#f56954",
highlight: "#f56954",
label: "Chrome"
},
{
value: 500,
color: "#00a65a",
highlight: "#00a65a",
label: "IE"
},
{
value: 400,
color: "#f39c12",
highlight: "#f39c12",
label: "FireFox"
},
{
value: 600,
color: "#00c0ef",
highlight: "#00c0ef",
label: "Safari"
},
{
value: 300,
color: "#3c8dbc",
highlight: "#3c8dbc",
label: "Opera"
},
{
value: 100,
color: "#d2d6de",
highlight: "#d2d6de",
label: "Navigator"
}
];
var pieOptions = {
//Boolean - Whether we should show a stroke on each segment
segmentShowStroke: true,
//String - The colour of each segment stroke
segmentStrokeColor: "#fff",
//Number - The width of each segment stroke
segmentStrokeWidth: 2,
//Number - The percentage of the chart that we cut out of the middle
percentageInnerCutout: 50, // This is 0 for Pie charts
//Number - Amount of animation steps
animationSteps: 100,
//String - Animation easing effect
animationEasing: "easeOutBounce",
//Boolean - Whether we animate the rotation of the Doughnut
animateRotate: true,
//Boolean - Whether we animate scaling the Doughnut from the centre
animateScale: false,
//Boolean - whether to make the chart responsive to window resizing
responsive: true,
// Boolean - whether to maintain the starting aspect ratio or not when responsive, if set to false, will take up entire container
maintainAspectRatio: true,
//String - A legend template
legendTemplate: "<ul class=\"<%=name.toLowerCase()%>-legend\"><% for (var i=0; i<segments.length; i++){%><li><span style=\"background-color:<%=segments[i].fillColor%>\"></span><%if(segments[i].label){%><%=segments[i].label%><%}%></li><%}%></ul>"
};
//Create pie or douhnut chart
// You can switch between pie and douhnut using the method below.
pieChart.Doughnut(PieData, pieOptions);
答案 0 :(得分：1)
您可以通过以下方式完成此操作......
// for demonstration purposes only
// use response.d in real case scenario
var response = [{ "clinic_name": "Clinic 1", "total_checked_up": "10" }, { "clinic_name": "Clinic 2", "total_checked_up": "20" }, { "clinic_name": "Clinic 3", "total_checked_up": "30" }, { "clinic_name": "Clinic 4", "total_checked_up": "40" }]; // response from ajax request
OnSuccess_(response);
function OnSuccess_(response) {
var pieChartCanvas = $("#pieChart").get(0).getContext("2d");
var pieChart = new Chart(pieChartCanvas);
var PieData = [];
// create PieData dynamically
response.forEach(function(e) {
var random_color = '#' + Math.floor(Math.random() * 16777215).toString(16);
PieData.push({
value: e.total_checked_up,
color: random_color,
highlight: random_color,
label: e.clinic_name
});
});
var pieOptions = {
//Boolean - Whether we should show a stroke on each segment
segmentShowStroke: true,
//String - The colour of each segment stroke
segmentStrokeColor: "#fff",
//Number - The width of each segment stroke
segmentStrokeWidth: 2,
//Number - The percentage of the chart that we cut out of the middle
percentageInnerCutout: 0, // This is 0 for Pie charts
//Number - Amount of animation steps
animationSteps: 100,
//String - Animation easing effect
animationEasing: "easeOutBounce",
//Boolean - Whether we animate the rotation of the Doughnut
animateRotate: true,
//Boolean - Whether we animate scaling the Doughnut from the centre
animateScale: false,
//Boolean - whether to make the chart responsive to window resizing
responsive: true,
// Boolean - whether to maintain the starting aspect ratio or not when responsive, if set to false, will take up entire container
maintainAspectRatio: true,
//String - A legend template
legendTemplate: "<ul class=\"<%=name.toLowerCase()%>-legend\"><% for (var i=0; i<segments.length; i++){%><li><span style=\"background-color:<%=segments[i].fillColor%>\"></span><%if(segments[i].label){%><%=segments[i].label%><%}%></li><%}%></ul>"
};
//Create pie or douhnut chart
// You can switch between pie and douhnut using the method below.
pieChart.Doughnut(PieData, pieOptions);
}<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/1.0.2/Chart.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<canvas id="pieChart"></canvas>