generalized layouts

app/templates/chartist.html

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+{% from "_render_field.html" import render_field %}
+
+<h1>Population by Nation</h1><br>
+data from 
+<a href="https://data.world/nrippner/population-by-country1980-2010">data.world</a>
+<br><br>
+Created with Flask and chartist.js
+
+<span class='nation' value='nation'></span>
+
+
+<fieldset>
+  <legend>World Population</legend>
+{{ render_field(form.nation) }}
+  
+
+<div class="ct-chart ct-perfect-fourth">
+    
+</div>

app/templates/chartist.js

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+var mychart;
+
+var nation = $("#nation option:selected").text()
+var getData = $.get('/data/'.concat(nation));
+
+getData.done(function(results){
+
+  var data = {
+    labels: results.labels,
+    series: [
+      results.results
+      ]
+  };
+
+  mychart = new Chartist.Line('.ct-chart', data);
+
+})
+
+function updateChart(){
+  var nation = $("#nation option:selected").text()
+
+  var updatedData = $.get('/data/'.concat(nation));
+
+  updatedData.done(function(results){
+  var data = {
+    labels: results.labels,
+    series: [
+      results.results
+      ]
+  };
+
+  mychart.update(data)
+  });
+
+}
+
+$('#update').on('click', updateChart)
+$('#nation').on('change', updateChart)

app/templates/chartist_head_scripts.html

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+    <link rel="stylesheet" href="https://cdn.jsdelivr.net/chartist.js/latest/chartist.min.css">
+    <script src="https://cdn.jsdelivr.net/chartist.js/latest/chartist.min.js"></script>
+    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
+    <sctipt src="static/chartist.js"></sctipt>