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POjQuery XML via AJAX: missing some nodes occasionally
 

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  1. POjQuery XML via AJAX: missing some nodes occasionally
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    <p>I have a flot graph that polls data via <code>ajax</code> from an XML document. I use mode: <code>time for x axis</code>. It works fine, except intermittently, some values from the <code>xml Document</code> gets dropped. Here is the code that fetches <code>xml</code> via <code>ajax</code>.</p> <pre><code>function graphUpdate() { $.ajax( { url: "EnergyDM.xml", type:"GET", dataType: "XML", success: onxmlReceived, error: function(xhr, textStatus, errorThrown) { alert(textStatus + ' ' + errorThrown); } }); // setTimeout(graphUpdate,10000); } function onxmlReceived(data) { var xmlData = null; //for Non IE Browsers if(window.DOMParser) { //xmlData = data; parser = new DOMParser(); xmlData = parser.parseFromString(data, "text/xml"); } // For IE else { xmlData = new ActiveXObject("Microsoft.XMLDOM"); xmlData.async = false; xmlData.loadXML(data); } $(xmlData).find('energyDM').each(function(){ Rec_Count = parseInt($(this).find('edNum').text()); d1=[]; for(var i = 0; i &lt; Rec_Count; i++) { if(i &lt; 10) { d1.push([(parseInt($(this).find('et000'+i).text(),10))*1000, parseFloat($(this).find('ed000'+i).text())]); } else if(i &lt; 100) { d1.push([(parseInt($(this).find('et00'+i).text(),10))*1000, parseFloat($(this).find('ed00'+i).text())]); } else { d1.push([(parseInt($(this).find('et0'+i).text(),10))*1000, parseFloat($(this).find('ed0'+i).text())]); } } plotWithOptions(); }); } </code></pre> <p>The XML file looks like this:</p> <pre><code>&lt;energyDM&gt; &lt;edNum&gt;305&lt;/edNum&gt; &lt;TMF&gt;UTC &lt;/TMF&gt; &lt;pm339&gt; 1.271&lt;/pm339&gt;&lt;!-- pm339 max energy demand value --&gt; &lt;pm340&gt;1325033716&lt;/pm340&gt;&lt;!-- pm340 max energy demand occured time --&gt; &lt;ed0000&gt; 0.282&lt;/ed0000&gt; &lt;et0000&gt;1325545093&lt;/et0000&gt; &lt;ed0001&gt; 0.283&lt;/ed0001&gt; &lt;et0001&gt;1325544792&lt;/et0001&gt; &lt;ed0002&gt; 0.284&lt;/ed0002&gt; &lt;et0002&gt;1325544492&lt;/et0002&gt; ... &lt;ed0305&gt; 0.284&lt;/ed0305&gt; &lt;et0305&gt;1325544492&lt;/et0305&gt; &lt;/energyDM&gt; </code></pre> <p>When the returned XML misses nodes, if I use Chrome to view the values, it shows something like: </p> <pre><code> &lt;ed0023&gt; 0.283&lt;/ed0023&gt; &lt;et0023&gt;1325538176&lt;/et0023&gt; &lt;ed0024&gt; 0.281&lt;/ed0024&gt; &lt;et0024&gt;1325537875&lt;/et0024&gt; &lt;ed0035&gt; 0.281&lt;/ed0035&gt; &lt;et0035&gt;1325534564&lt;/et0035&gt; &lt;ed0036&gt; 0.280&lt;/ed0036&gt; &lt;et0036&gt;1325534263&lt;/et0036&gt; </code></pre> <p>And this does not always happen. If I keep refreshing the page, it may drop few nodes, then the whole thing comes up, etc. And it is not always the same nodes getting dropped either.</p> <p>I'd appreciate any hints.</p>
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    1. COFYI you can simplify your node name code to `'et' + ('0000' + i).substr(-4)` and get rid of obnoxious `if`s
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      1. USIlia G
    2. COAlso, shouldn't `data` already be an XML document? Why are you parsing it again?
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    3. COAre the nodes dropped because of your parsing or in the raw XML? If the latter, what is generating the xml document?
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      1. USMark
 

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