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POd3 map with checkbox filtering
 

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    <p>I have a made a d3 symbolic map and would like the user to be able to filter points by an attribute called 'type'. There are three types: a, b, c, each of which has an associated html checkbox, that when checked should display points of type a, and when un-checked should remove those points. I was wondering what the best way to pass the check/uncheck event into d3? I am thinking if there was a way to pass the checked types into a select.filter(), that would be the best way to go. Here is the code:</p> <p>HTML</p> <pre><code>&lt;div class="filter_options"&gt; &lt;input class="filter_button" id="a_button" type="checkbox"&gt;a&lt;/input&gt;&lt;br&gt; &lt;input class="filter_button" id="b_button" type="checkbox"&gt;b&lt;/input&gt;&lt;br&gt; &lt;input class="filter_button" id="c_button" type="checkbox"&gt;c&lt;/input&gt;&lt;br&gt; &lt;/div&gt; </code></pre> <p>js</p> <pre><code>queue() .defer(d3.json, "basemap.json") .defer(d3.json, "points.json") .await(ready); function ready(error, base, points) { var button = svg.append("path") .attr("class", "polys") .datum(topojson.object(us, base.objects.polys)) .attr("d", path); svg.selectAll(".symbol") .data(points.features) .enter().append("path") .filter(function(d) { return d.properties.type != null ? this : null; }) .attr("class", "symbol") .attr("d", path.pointRadius(function(d) { return radius(d.properties.frequency * 50000); })) .style("fill", function(d) { return color(d.properties.type); });; </code></pre> <p>Currently, the filter is set to catch all points:</p> <pre><code>.filter(function(d) { return d.properties.type != null ? this : null; }) </code></pre> <p>I would like the user to be able to change this.</p> <p>Cheers</p>
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