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