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Slice Data Plot using API

FusionCharts Suite XT includes advanced features that offers a wide range of APIs that you can use for different stages in the ife cycle of a chart or when you interact with a chart. These features include completion of rendering of the chart, handling the radio button at runtime, etc.

This article focuses on how you can slice out the data plots of a Pie 2D chart using chart specific custom API. The chart will be rendered using a Python function.

A chart configured to slice out the data plots of a pie2d chart, is shown below:

FusionCharts will load here..
{
    "chart": {
        "caption": "Market Share of Web Servers",
        "plottooltext": "<b>$percentValue</b> of web servers run on $label servers",
        "showPercentValues": "1",
        "useDataPlotColorForLabels": "1",
        "enableMultiSlicing": "0",
        "showlegend": "0",
        "theme": "fusion"
    },
    "data": [
        {
            "label": "Apache",
            "value": "32647479"
        },
        {
            "label": "Microsoft",
            "value": "22100932"
        },
        {
            "label": "Zeus",
            "value": "14376"
        },
        {
            "label": "Other",
            "value": "18674221"
        }
    ]
}

The full code for the above chart is shown below:

from django.shortcuts import render
from django.http import HttpResponse

# Include the `fusioncharts.py` file which has required functions to embed the charts in html page
from ..fusioncharts import FusionCharts

# Loading Data from a Static JSON String
# It is a example to show how to attach event in chart.
# The `chart` method is defined to load chart data from an JSON string.

def chart(request):

    # Create an object for the pie2d chart using the FusionCharts class constructor
    pie2d = FusionCharts("pie2d", "ex1", '450', '250', "chart-1", "json", 
          # The chart data is passed as a string to the `dataSource` parameter.
        """{  
            "chart": 
            { 
                "caption": "Market Share of Web Servers",
                "plottooltext": "<b>$percentValue</b> of web servers run on $label servers",
                "showLegend": "0",
                "enableMultiSlicing": "0",
                "showPercentValues": "1",
                "legendPosition": "bottom",
                "useDataPlotColorForLabels": "1",
                "theme": "fusion"
            },
            "data": [{ 
                    "label": "Apache",
                    "value": "32647479"
                }, { 
                    "label": "Microsoft", 
                    "value": "22100932" 
                }, { 
                    "label": "Zeus", 
                    "value": "14376" 
                }, { 
                    "label": "Other",
                    "value": "18674221" 
            }]
        }""")        

    # Attach event with method name, and the callee method defined in html page.)
    pie2d.addEvent("dataplotClick", "plotClickHandler")

     # returning complete JavaScript and HTML code, which is used to generate chart in the browsers. 
    return  render(request, 'special-chart-type-api.html', {'output' : pie2d.render(),'chartTitle': 'Special chart type API'})

The HTML template to render the above chart is shown below:

<!DOCTYPE html>
<html>

<head>
    <title>FC-python wrapper</title>

    <script type="text/javascript" src="//cdn.fusioncharts.com/fusioncharts/latest/fusioncharts.js"></script>
    <script type="text/javascript" src="//cdn.fusioncharts.com/fusioncharts/latest/themes/fusioncharts.theme.fusion.js"></script>
    <script>
        plotClickHandler = function(event){
           clickedPlot = (event.data.categoryLabel).toLowerCase();
             if (selectedItem !== clickedPlot) {
                   selectedItem = clickedPlot;
             } else{
                   selectedItem = 'none';
             }
       };
       selectedItem = "none";
       getFusionChart = function(){
           return FusionCharts("ex1");
       }
       noneChecked = function(){
            getFusionChart().slicePlotItem(0,false);
            getFusionChart().slicePlotItem(1,false);
            getFusionChart().slicePlotItem(2,false);
            getFusionChart().slicePlotItem(3,false);
       }
       apacheChecked = function(){
            getFusionChart().slicePlotItem(0,true);
       }
       microsoftChecked = function(){
            getFusionChart().slicePlotItem(1,true);
       }
       zeusChecked = function(){
            getFusionChart().slicePlotItem(2,true);
       }
       otherChecked = function(){
            getFusionChart().slicePlotItem(3,true);
       }
   </script>
</head>

<body style="font-family:'Helvetica Neue', Arial; font-size: 16px;">
    <h3>{{ chartTitle|safe }}</h3>
    <div align="center" id="chart-1">{{ output|safe }}</div>
    <br />
    <br />
    <div id="controllers" align="center" style="font-family:'Helvetica Neue', Arial; font-size: 14px;">
        <label style="padding: 0px 5px !important;">
            <input type="radio" name="rdGrp-options" checked onClick="noneChecked()" /> None
        </label>
        <label style="padding: 0px 5px !important;">
            <input type="radio" name="rdGrp-options" onClick="apacheChecked()" /> Apache
        </label>
        <label style="padding: 0px 5px !important;">
            <input type="radio" name="rdGrp-options" onClick="microsoftChecked()" /> Microsoft
        </label>
        <label style="padding: 0px 5px !important;">
            <input type="radio" name="rdGrp-options" onClick="zeusChecked()" /> Zeus
        </label>
        <label style="padding: 0px 5px !important;">
            <input type="radio" name="rdGrp-options" onClick="otherChecked()" /> Other
        </label>
    </div>
</body>

</html>

The sample code provided above corresponds to the following tasks:

  1. Import and resolve dependencies:

    • render from django.shortcuts, and HttpResponse from django.http

    • FusionCharts from fusioncharts

  2. Define a function chart, which takes request as an argument:

    • Create a variable pie2d, which is an instance of the FusionCharts class. As argument values for FusionCharts, pass the chart details and the configuration (JSON string):

      • Set the chart type as pie2d. Find the complete list of chart types with their respective alias here.

      • Set the id as ex1.

      • Set the width and height of the chart in pixels. You can also provide them as percentages.

      • Set the renderAt as chart-1.

      • Set the dataFormat as json.

      • Embed the json data (string) as the value of dataSource.

    • Return the output of the render function (defined in FusionCharts):

      • Pass the request, which is also the only argument accepted by the chart function you are defining.

      • Pass the relative path of the HTML template, where the chart will be rendered.

      • Pass a dictionary to set the output to pie2d.render().

When you change the values of id and renderAt, ensure that the corresponding changes are reflected in the HTML template. The string values for renderAt in the code, and the corresponding div id in the HTML template, should be the exact same.