为Charts.js添加for循环/ foreach循环

Question

我试图在foreach中添加或为以下代码中的for循环创建charts.js的多个数据集。这将允许我在该线图上创建多行。

我有一个PHP对象，我可以编码以便稍后填写变量，但是如何以及在哪里可以注入一个循环以仅创建多个数据集？

<script> 
var chart1Handler = function() { 
var data = { 
    labels: {!! json_encode($month_array) !!}, 
    datasets: [{ 
      label:'', 
      fillColor: 'rgba(220,220,220,0.2)', 
      strokeColor: 'rgba(220,220,220,1)', 
      pointColor: 'rgba(220,220,220,1)', 
      pointStrokeColor: '#fff', 
      pointHighlightFill: '#fff', 
      pointHighlightStroke: 'rgba(220,220,220,1)', 
      data: {{ json_encode($new_taco) }} 
    }] 
}; 

var options = { 

    maintainAspectRatio: false, 

    // Sets the chart to be responsive 
    responsive: true, 

    ///Boolean - Whether grid lines are shown across the chart 
    scaleShowGridLines: true, 

    //String - Colour of the grid lines 
    scaleGridLineColor: 'rgba(0,0,0,.05)', 

    //Number - Width of the grid lines 
    scaleGridLineWidth: 1, 

    //Boolean - Whether the line is curved between points 
    bezierCurve: false, 

    //Number - Tension of the bezier curve between points 
    bezierCurveTension: 0.4, 

    //Boolean - Whether to show a dot for each point 
    pointDot: true, 

    //Number - Radius of each point dot in pixels 
    pointDotRadius: 4, 

    //Number - Pixel width of point dot stroke 
    pointDotStrokeWidth: 1, 

    //Number - amount extra to add to the radius to cater for hit detection outside the drawn point 
    pointHitDetectionRadius: 20, 

    //Boolean - Whether to show a stroke for datasets 
    datasetStroke: true, 

    //Number - Pixel width of dataset stroke 
    datasetStrokeWidth: 2, 

    //Boolean - Whether to fill the dataset with a colour 
    datasetFill: true, 

    // Function - on animation progress 
    onAnimationProgress: function() { 
    }, 

    // Function - on animation complete 
    onAnimationComplete: function() { 
    }, 

    //String - A legend template 
    legendTemplate: '<ul class="tc-chart-js-legend"><% for (var i=0; i<datasets.length; i++){%><li><span style="background-color:<%=datasets[i].strokeColor%>"></span><%if(datasets[i].label){%><%=datasets[i].label%><%}%></li><%}%></ul>' 
}; 
// Get context with jQuery - using jQuery's .get() method. 
var ctx = $("#chart1").get(0).getContext("2d"); 
// This will get the first returned node in the jQuery collection. 
var chart1 = new Chart(ctx).Line(data, options); 
//generate the legend 
var legend = chart1.generateLegend(); 
//and append it to your page somewhere 
$('#chart1Legend').append(legend); 

}; 

</script> 

Answer 1

你可以在你的PHP代码中创建你的数据集数组，并将它作为json传递给JS。然后你只需要在使用之前解析它。

在PHP：

$datasets = [ 
    [ 
     'label'=>'', 
     'fillColor'=> 'rgba(220,220,220,0.2)', 
     'strokeColor'=> 'rgba(220,220,220,1)', 
     'pointColor'=> 'rgba(220,220,220,1)', 
     'pointStrokeColor'=> '#fff', 
     'pointHighlightFill'=> '#fff', 
     'pointHighlightStroke'=> 'rgba(220,220,220,1)', 
     'data' => [1,2,3] 
    ], 
    [ 
     'label'=>'', 
     'fillColor'=> 'rgba(220,220,220,0.2)', 
     'strokeColor'=> 'rgba(220,220,220,1)', 
     'pointColor'=> 'rgba(220,220,220,1)', 
     'pointStrokeColor'=> '#fff', 
     'pointHighlightFill'=> '#fff', 
     'pointHighlightStroke'=> 'rgba(220,220,220,1)', 
     'data' => [1,2,3] 
    ] 
]; 
$datasets = json_encode($datasets); 

在JS：

var data = { 
    labels: {!! json_encode($month_array) !!}, 
    datasets: JSON.parse('<?=$datasets?>') 
}; 

BTW，我认为这是值得一提的是JS数组没有被对待的方式作为一个JSON字符串相同，甚至尽管它们看起来很相似。所以，即使我没有看到有关实现的更多细节，我假设您需要传递一个数组而不是JSON作为labels的值。您也可以使用与数据集相同的方法。