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    <p>You should use parseFloat() to change string into number for Ask / High values. </p> <pre><code>data.push([ parseInt(jsonData[i].InserTime.substr(6)), parseFloat(jsonData[i].Ask), parseFloat(jsonData[i].High), parseFloat(jsonData[i].Low), parseFloat(jsonData[i].Bid)]); </code></pre> <p>Here's a full example:</p> <p>HTML:</p> <pre><code>&lt;div class="graphs"&gt; &lt;div id="chartEURUSDContainer" style="height: 331px; min-width: 611px"&gt;&lt;/div&gt; &lt;/div&gt; &lt;script src="http://ajax.aspnetcdn.com/ajax/jquery/jquery-1.9.0.min.js" type="text/javascript"&gt;&lt;/script&gt; &lt;script src="http://code.highcharts.com/stock/highstock.js"&gt;&lt;/script&gt; &lt;script src="http://code.highcharts.com/stock/modules/exporting.js"&gt;&lt;/script&gt; </code></pre> <p>Javascript:</p> <pre><code> $(function () { var jsonData = [{ "LastModification": "04:18:45", "Symbol": "EURUSD", "Bid": "1.33132", "Ask": "1.33157", "High": "1.33336", "Low": "1.33007", "Direction": "0", "InserTime": "\/Date(1358760060933)\/" }, { "LastModification": "04:20:05", "Symbol": "EURUSD", "Bid": "1.33151", "Ask": "1.33174", "High": "1.33336", "Low": "1.33007", "Direction": "0", "InserTime": "\/Date(1358760140625)\/" }, { "LastModification": "04:21:25", "Symbol": "EURUSD", "Bid": "1.3312", "Ask": "1.33144", "High": "1.33336", "Low": "1.33007", "Direction": "1", "InserTime": "\/Date(1358760220731)\/" }, { "LastModification": "04:22:48", "Symbol": "EURUSD", "Bid": "1.33115", "Ask": "1.33141", "High": "1.33336", "Low": "1.33007", "Direction": "-1", "InserTime": "\/Date(1358760300387)\/" }, { "LastModification": "04:23:48", "Symbol": "EURUSD", "Bid": "1.33107", "Ask": "1.33132", "High": "1.33336", "Low": "1.33007", "Direction": "-1", "InserTime": "\/Date(1358760361033)\/" }, { "LastModification": "04:25:08", "Symbol": "EURUSD", "Bid": "1.33139", "Ask": "1.33164", "High": "1.33336", "Low": "1.33007", "Direction": "0", "InserTime": "\/Date(1358760440193)\/" }, { "LastModification": "04:26:28", "Symbol": "EURUSD", "Bid": "1.33202", "Ask": "1.33222", "High": "1.33336", "Low": "1.33007", "Direction": "1", "InserTime": "\/Date(1358760520037)\/" }, { "LastModification": "04:27:48", "Symbol": "EURUSD", "Bid": "1.33212", "Ask": "1.33238", "High": "1.33336", "Low": "1.33007", "Direction": "-1", "InserTime": "\/Date(1358760600163)\/" }] var data = []; fillData(); function fillData() { for (i = 0; i &lt; jsonData.length; i++) { data.push([ parseInt(jsonData[i].InserTime.substr(6)), parseFloat(jsonData[i].Ask), parseFloat(jsonData[i].High), parseFloat(jsonData[i].Low), parseFloat(jsonData[i].Bid)]); } CreateChart(); } function CreateChart() { // create the chart chart = new Highcharts.StockChart({ chart: { renderTo: 'chartEURUSDContainer', type: 'candlestick', marginRight: 10, }, rangeSelector: { enabled: false }, scrollbar: { enabled: false }, navigator: { enabled: false }, series: [{ type: 'candlestick', color: '#00FF00', name: 'Currency Rates', data: data, }] }); } }); </code></pre> <p><a href="http://jsfiddle.net/Jj3Ws/5/" rel="nofollow">Demo on JS Fiddle</a>.</p>
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    1. POHow do I use Highcharts to display candlestick with small values?
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