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POdojox.charting.Chart dataRange not restricting the chart x axis properly
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  1. POdojox.charting.Chart dataRange not restricting the chart x axis properly
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    copied!<p>I am building an application that monitors the number of services running on an application server. Information about the services running will be stored on a database, and I want to display some of that information on a webpage. At this point I just want to build a graphical representation of the number of services actively running, which updates dynamically as the database is updated. The goal is to create a simple chart that displays the most recent 10 (or so) values for the number of services running, similar to what an ekg readout looks like. I am using the dojox.charting.Chart widget, but I am having trouble updating the chart properly, so that it only displays the ten most recent values for numFailedAttempts:"0". As it is right now, the chart displays all the values, and the x axis values continuously get closer and closer together to accommidate everything. Based on the dojo api reference and documentation on dojotoolkit.org, I thought that the "displayRange" attribute for the dojox.charting.Chart was supposed to solve this problem. So my question is, what am I doing wrong? Here's the code: </p> <pre><code>&lt;html&gt; &lt;head&gt; &lt;meta http-equiv="Content-Type" content="text/html; charset=UTF-8"&gt; &lt;link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/dojo/1.6/dojo/resources/dojo.css"&gt; &lt;script src="http://ajax.googleapis.com/ajax/libs/dojo/1.6.0/dojo/dojo.xd.js" data-dojo-config="isDebug: true, parseOnLoad: true"&gt;&lt;/script&gt; &lt;script type="text/javascript"&gt; dojo.require("dojox.charting.StoreSeries"); dojo.require("dojox.charting.Chart2D"); dojo.require("dojo.store.Memory"); dojo.require("dojo.store.Observable"); dojo.require("dojox.charting.Chart"); dojo.require("dojox.charting.plot2d.Areas"); dojo.ready(function(){renderDataChart()}); function renderDataChart(){ //data from a database var dataChartData = { itentifier: 'id', items: [ {id: 1, serviceName:"service1", startDate:"today", endDate:"today", numFailedAttempts:"1", errorTime:"null", errorMessage:"null", suppressError:"null"}, {id: 2, serviceName:"service2", startDate:"today", endDate:"today", numFailedAttempts:"1", errorTime:"now", errorMessage:"broken", suppressError:"click"}, {id: 3, serviceName:"service3", startDate:"today", endDate:"today", numFailedAttempts:"0", errorTime:"now", errorMessage:"broken", suppressError:"click"}, {id: 4, serviceName:"service4", startDate:"today", endDate:"today", numFailedAttempts:"1", errorTime:"now", errorMessage:"broken", suppressError:"click"}, {id: 5, serviceName:"service5", startDate:"today", endDate:"today", numFailedAttempts:"0", errorTime:"null", errorMessage:"null", suppressError:"null"} ] }; //data store var dataChartStore = dojo.store.Observable(new dojo.store.Memory({ data: { identifier: "id", label: "runningServices", items: dataChartData } })); var dataChart = new dojox.charting.Chart("myDataChart", { displayRange: 10, stretchToFit: false, scrolling: true, fieldName: "runningServices", type: dojox.charting.plot2d.Areas }); dataChart.addAxis("x", {microTickStep: 1, minorTickStep: 1}); dataChart.addAxis("y", {vertical: true, minorTickStep: 1, natural: true}); dataChart.addSeries("y", new dojox.charting.StoreSeries(dataChartStore, {query: {numFailedAttempts: 0}}, "value")); dataChart.render(); //update datastore to simulate new data var startNumber = dataChartData.length; var interval = setInterval(function(){ dataChartStore.notify({value: Math.ceil(Math.random()*29), id: ++startNumber, numFailedAttempts: 0}); }, 1000); } &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;div id="myDataChart" style="width: 500px; height: 200px;"&gt;&lt;/div&gt; &lt;/body&gt; </code></pre> <p></p>
 

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