将外部JSON加载到ChartJs中 [英] Loading an external JSON into ChartJs
问题描述
在使用库在JavaScript中绘制图表时，我是一个新手.我刚刚开始尝试使用Chartjs，但我一直无法使用getJson或其他任何方式加载我的json对象并替换标签和数据.我以前使用过HighCharts，与之相比，它非常简单.另外，我将如何将其放入Angular的指令中并显示出来.
I am a newbie when it comes to using libraries for drawing charts in JavaScript/ I just started experimenting with Chartjs and I have been unable to how to use getJson or anything else to load my json object and replace the labels and data. I have used HighCharts before and its quite simple compared to this. Also, how would I go about putting this into a directive in Angular and displaying it.
https://jsfiddle.net/0u9Lpttx/1/
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<div style="width: 100%; height: 100%;">
<canvas id="myChart" style="width: 100%; height: auto;"></canvas>
</div>
<div id="js-legend" class="chart-legend"></div>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.0.6/angular.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/Chart.js/1.0.1/Chart.min.js"></script>
<script src="js/chartJsControl.js"></script>
</body>
</html>
data.json
[
{
"timestamp": "Monday",
"original_tweet": "756",
"retweets": "345",
"shared": "34",
"quoted": "14"
},
{
"timestamp": "Tuesday",
"original_tweet": "756",
"retweets": "345",
"shared": "34",
"quoted": "14"
},
{
"timestamp": "Wednesday",
"original_tweet": "756",
"retweets": "345",
"shared": "34",
"quoted": "14"
}
]
chartJsControl.js
var test = [];
$.getJSON("data.json", function (json) {
test.push(json[i].timestamp);
});
var data = {
labels: test,
datasets: [
{
label: "My First dataset",
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)",
data: [65, 59, 80, 81, 56, 55, 40]
},
{
label: "My Second dataset",
fillColor: "rgba(151,187,205,0.5)",
strokeColor: "rgba(151,187,205,0.8)",
highlightFill: "rgba(151,187,205,0.75)",
highlightStroke: "rgba(151,187,205,1)",
data: [28, 48, 40, 19, 86, 27, 90]
}
]
};
var ctx = document.getElementById("myChart").getContext("2d");
ctx.canvas.width = 1000;
ctx.canvas.height = 800;
var myChart = new Chart(ctx).Bar(data);
推荐答案
如果要使用从data.json返回的JSON，则需要在回调函数中执行以下操作:
If you want to use the returned JSON from data.json you need to do this in the callback function like this:
$.getJSON("data.json", function (json) {
// will generate array with ['Monday', 'Tuesday', 'Wednesday']
var labels = json.map(function(item) {
return item.timestamp;
});
var data = {
labels: labels,
datasets: [
{
label: "My First dataset",
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)",
data: [65, 59, 80, 81, 56, 55, 40]
},
{
label: "My Second dataset",
fillColor: "rgba(151,187,205,0.5)",
strokeColor: "rgba(151,187,205,0.8)",
highlightFill: "rgba(151,187,205,0.75)",
highlightStroke: "rgba(151,187,205,1)",
data: [28, 48, 40, 19, 86, 27, 90]
}
]
};
var ctx = document.getElementById("myChart").getContext("2d");
ctx.canvas.width = 1000;
ctx.canvas.height = 800;
var myChart = new Chart(ctx).Bar(data);
});
如果将它与Angular一起使用，我建议使用angular chart.js版本，请参见: http://jtblin.github.io/angular-chart.js/
If you are using it with Angular I would recommend using the angular chart.js version, see: http://jtblin.github.io/angular-chart.js/
那么您已经有了一个可以使用的角度指令！
Then you already have an angular directive, which you can use!
这篇关于将外部JSON加载到ChartJs中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
