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<!DOCTYPE html>
<html lang="en">
<head>
<!-- Global site tag (gtag.js) - Google Analytics -->
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<meta charset="utf-8">
<title>Line chart | the D3 Graph Gallery</title>
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta name="description" content="The linechart section provides many examples of line charts built with Javascript and D3.js. It provides explanation and reproducible code.">
<meta name="keywords" content="Data,Dataviz,Datavisualization,Javascript,D3,D3.js,lineplot,linechart">
<meta name="author" content="Yan Holtz">
<link rel="icon" href="img/logo/D3_single_small.png">
<meta property="og:title" content="Line chart | the D3 Graph Gallery">
<meta property="og:image" content="img/overview_RGG.png">
<meta property="og:description" content="The linechart section provides many examples of line charts built with Javascript and D3.js. It provides explanation and reproducible code.">
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<!-- Header -->
<header class="masthead" style="padding-top: 150px; padding-bottom: 80px">
<div class="textlanding">
<h1>Line chart</h1>
<hr class="short_hr">
<br>
<ul class="list-inline social-buttons">
<li class="list-inline-item">
<a href="https://twitter.com/R_Graph_Gallery">
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<a href="https://github.com/holtzy">
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<br><br>
<p style="max-width: 700px; margin: auto">This is the <a href="https://www.data-to-viz.com/graph/line.html">line chart</a> section of the gallery. If you want to know more about this kind of chart, visit <a href="https://www.data-to-viz.com/graph/line.html">data-to-viz.com</a>. If you're looking for a simple way to implement it in d3.js, pick an example below.</p>
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<section class="bg" id="portfolio" style="padding-top: 10px">
<div class="container">
<div class="mySeryTitle">Step by step</div>
<hr>
<p>Line chart are built thanks to the <code>d3.line()</code> helper function. I strongly advise to have a look to the <a href="https://www.d3-graph-gallery.com/graph/shape.html#myline">basics of this function</a> before trying to build your first chart. First example here is the <a href="graph/line_basic.html">most basic line plot</a> you can do. Next one shows how to display <a href="graph/line_several_group.html">several groups</a>, and how to use <a href="graph/line_smallmultiple.html">small multiple</a> to avoid the <a href="https://www.data-to-viz.com/caveat/spaghetti.html">spaghetti chart</a>.</p>
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<p>Most basic</p>
<hr>
<p class="explanation_portfolio">The most basic line chart you can do in d3.js. Keeping only the core code.</p>
</div>
</div>
<img class="img-fluid" src="img/graph/line_basic.png" alt="">
</a>
</div>
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<a class="portfolio-link" href="graph/line_several_group.html">
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<p>Several groups</p>
<hr>
<p class="explanation_portfolio">Learn how to represent several groups on the line plot. This requires to group the data using the d3.nest function.</p>
</div>
</div>
<img class="img-fluid" src="img/graph/line_several_group.png" alt="">
</a>
</div>
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<a class="portfolio-link" href="graph/line_smallmultiple.html">
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<p>Small multiple</p>
<hr>
<p class="explanation_portfolio">Learn how to apply the small multiple technique on line plot. It allows to avoid the spaghetti plot where lines become unreadable.</p>
</div>
</div>
<img class="img-fluid" src="img/graph/line_smallmultiple.png" alt="">
</a>
</div>
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<a class="portfolio-link" href="graph/line_confidence_interval.html">
<div class="portfolio-hover">
<div class="portfolio-hover-content">
<p>Confidence interval</p>
<hr>
<p class="explanation_portfolio">Display confidence interval around main trend</p>
</div>
</div>
<img class="img-fluid" src="img/graph/line_confidence_interval.png" alt="">
</a>
</div>
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<a class="portfolio-link" href="graph/line_color_gradient_svg.html">
<div class="portfolio-hover">
<div class="portfolio-hover-content">
<p>Color gradient</p>
<hr>
<p class="explanation_portfolio">How to apply a color gradient on the line that is a unique svg element</p>
</div>
</div>
<img class="img-fluid" src="img/graph/line_color_gradient_svg.png" alt="">
</a>
</div>
</div>
<br><br>
<div class="mySeryTitle">Interactivity: switch data</div>
<hr>
<p>Three examples showing how to <u>switch</u> from one data series to another with smooth transition. <u>Three</u> situations are described. <u>1/</u> series are stored in <a href="graph/line_change_data.html">different input file</a>. <u>2/</u> series are stored in the same dataset, each in a <a href="graph/line_select.html">different columns</a> (wide format). <u>3/</u> same dataset, same column: long or tidy format.</p>
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<a class="portfolio-link" href="graph/line_change_data.html">
<div class="portfolio-hover">
<div class="portfolio-hover-content">
<p>1/ Transition between<br>input data</p>
<hr>
<p class="explanation_portfolio">Add a button that allows to go from one dataset to another with a smooth transition. Useful to understand how to build a <code>update()</code> function.</p>
</div>
</div>
<img class="img-fluid" src="img/graph/line_change_data.gif" alt="">
</a>
</div>
<div class="col-md-4 col-sm-6 portfolio-item">
<a class="portfolio-link" href="graph/line_select.html">
<div class="portfolio-hover">
<div class="portfolio-hover-content">
<p>2/ Transition between<br>column of input</p>
<hr>
<p class="explanation_portfolio">Dropdown button controls which columns of the dataset is displayed on the chart.<br><br>Wide format</p>
</div>
</div>
<img class="img-fluid" src="img/graph/line_select.gif" alt="">
</a>
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<a class="portfolio-link" href="graph/line_filter.html">
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<div class="portfolio-hover-content">
<p>3/ Transition between<br>value of a column</p>
<hr>
<p class="explanation_portfolio">Dropdown button controls which value of a column is displayed on the chart.<br><br>Long format</p>
</div>
</div>
<img class="img-fluid" src="img/graph/line_filter.gif" alt="">
</a>
</div>
</div>
<br><br>
<div class="mySeryTitle">Interactivity: other</div>
<hr>
<p>Interactivity can also be useful to zoom on a part of the chart or highlight a specific set of the chart</p>
<div id="portfolio-items" class="row">
<div class="col-md-4 col-sm-6 portfolio-item">
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<p>Brush for zooming</p>
<hr>
<p class="explanation_portfolio">How to use Brush to zoom on a specific part of the line chart.<br><br>Double click to reinitialize</p>
</div>
</div>
<img class="img-fluid" src="img/graph/line_brushZoom.gif" alt="">
</a>
</div>
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<div class="portfolio-hover">
<div class="portfolio-hover-content">
<p>Add cursor for exact value</p>
<hr>
<p class="explanation_portfolio">Recover the closest X position in the dataset and display its exact value</p>
</div>
</div>
<img class="img-fluid" src="img/graph/line_cursor.gif" alt="">
</a>
</div>
</div>
</div>
</section>
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<p class="mySeryTitle">Related chart types</p>
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<div class="captionPortfolio">Line plot</div>
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<div class="captionPortfolio">Stacked area</div>
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