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javascript - 将外部 JSON 加载到 ChartJs

转载 作者:塔克拉玛干 更新时间:2023-11-02 23:02:37 24 4
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在使用库在 JavaScript 中绘制图表时,我是一个新手/我刚开始尝试使用 Chartjs,但我一直无法使用 getJson 或其他任何东西来加载我的 json 对象并替换标签和数据。我以前使用过 HighCharts,与此相比它非常简单。另外,我将如何将它放入 Angular 的指令中并显示它。

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);

最佳答案

如果你想使用从 data.json 返回的 JSON,你需要在回调函数中这样做:

$.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);
});

如果您将它与 Angular 一起使用,我建议您使用 angular chart.js 版本,请参阅:http://jtblin.github.io/angular-chart.js/

那么您已经有了一个可以使用的 Angular Directive(指令)!

关于javascript - 将外部 JSON 加载到 ChartJs,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/32977262/

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