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<p>Data renderers allow jqPlot to pull data from any external source (e.g. a function implementing an AJAX call). Simply assign the external source to the "dataRenderer" plot option. The only requirement on data renderers is that it must return a valid jqPlot data array.</p>
<div id="chart1" style="height:300px; width:500px;"></div>
<pre class="code prettyprint brush: js"></pre>
<p>Data renderers get passed options by the plot. The signiture for a data renderer is:</p>
<pre class="brush: js">
function(userData, plotObject, options) {
...
return data;
}
</pre>
<p>Where userData is whatever data was passed into the plot, plotObject is a reference back to the plot itself, and options are any options passed into the plots "dataRendererOption" option. The following example shows a more complicated example which uses ajax pulls data from an external json data source.</p>
<div id="chart2" style="height:300px; width:500px;"></div>
<pre class="code prettyprint brush: js"></pre>
<script class="code" type="text/javascript">
$(document).ready(function(){
// Our data renderer function, returns an array of the form:
// [[[x1, sin(x1)], [x2, sin(x2)], ...]]
var sineRenderer = function() {
var data = [[]];
for (var i=0; i<13; i+=0.5) {
data[0].push([i, Math.sin(i)]);
}
return data;
};
// we have an empty data array here, but use the "dataRenderer"
// option to tell the plot to get data from our renderer.
var plot1 = $.jqplot('chart1',[],{
title: 'Sine Data Renderer',
dataRenderer: sineRenderer
});
});
</script>
<script class="code" type="text/javascript">
$(document).ready(function(){
// Our ajax data renderer which here retrieves a text file.
// it could contact any source and pull data, however.
// The options argument isn't used in this renderer.
var ajaxDataRenderer = function(url, plot, options) {
var ret = null;
$.ajax({
// have to use synchronous here, else the function
// will return before the data is fetched
async: false,
url: url,
dataType:"json",
success: function(data) {
ret = data;
}
});
return ret;
};
// The url for our json data
var jsonurl = "./jsondata.txt";
// passing in the url string as the jqPlot data argument is a handy
// shortcut for our renderer. You could also have used the
// "dataRendererOptions" option to pass in the url.
var plot2 = $.jqplot('chart2', jsonurl,{
title: "AJAX JSON Data Renderer",
dataRenderer: ajaxDataRenderer,
dataRendererOptions: {
unusedOptionalUrl: jsonurl
}
});
});
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