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POFully update pie chart using ExtJS 4.2.0 and external datasource
 

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  1. POFully update pie chart using ExtJS 4.2.0 and external datasource
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    <p>I am currently creating a "drill-down" style pie chart, where clicking on a "slice" should update the pie chart with data within that slice.</p> <p>Imagine for example an E-commerce report which shows sales by top level categories:</p> <p>Shirts - $10,000 Pants - $8,000 Shoes - $3,500</p> <p>Then clicking on the "Shirts" slice would display detailed information about sales in the Shirts category:</p> <p>T-Shirts - $7,000 Polo Shirts - $2,000 Tank Tops - $1,000</p> <p>I have a basic example here using a data source that returns random information:</p> <p><a href="http://jsfiddle.net/informationarchitech/BrMeh/" rel="nofollow">http://jsfiddle.net/informationarchitech/BrMeh/</a></p> <pre><code>Ext.onReady(function () { var level = 1; Ext.define('Report', { extend: 'Ext.data.Model', fields: [{ name: 'category', type: 'string' }, { name: 'purchases', type: 'string' }], }); var store = Ext.create('Ext.data.Store', { id: 'store', model: 'Report', autoLoad: true, proxy: { type: 'jsonp', url: 'http://informationarchitech.com/demos/rand.php', reader: { root: 'content', } } }); Ext.create('Ext.chart.Chart', { renderTo: Ext.getBody(), width: 500, height: 350, animate: true, store: store, series: [{ listeners: { itemmousedown: function (obj) { level++; store.getProxy().url = 'http://informationarchitech.com/demos/rand.php?parent=' + obj.storeItem.data['category'] + '&amp;level=' + level; store.load(); } }, type: 'pie', angleField: 'purchases', showInLegend: true, label: { field: 'category', display: 'rotate', contrast: true, font: '18px Arial' } }] }); }); </code></pre> <p>As you can see, clicking on a slice results in inconsistent behavior. Sometimes it seems to update correctly, but often it seems to somehow be merging or overwriting the previous data.</p> <p>I have tried every "clear," "update," "reset" method I can find, on the chart, the store, etc, and nothing I have tried seems to successfully "fully" update the pie chart with the new data. Can anyone tell me what I am doing wrong?</p>
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