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Null/nodata feature handling logic
- new option `noDataColor`: fill color to use for features with null/nodata attribute values. In polygon, point-color and line-color modes. (default: '#606060'). Also appears in legend as a separate class/category. Currently, null/nodata features are not assigned a distinctive symbol when in point-size and line-width modes. - new option `noDataIgnore`: if true, features with null attribute values are not shown on the map. This also means the legend will not have a nodata classs (default: false) - new option `nodata` in `legendTemplate`: you can now customize the nodata text in Legend - modified classification code to filter out null attribute values when generating classes - more thorough check for non-existing attribute field vs. null as attribute value (with more concise error messages) - legend data rows (symbol + key) now have a css class (`legendDataRow`), set in leaflet-dataclassification.css, resulting in a cleaner legend-generation code - updated examples (`combined.html` dataset: density value for North Dakota has been nulled to showcase nodata handling; all show an info panel about the plugin; overriding Chrome's built-in CSS rules to avoid focus rectangle on clicking polygons on a Leaflet map) - updated documentation - updated main screenshot
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‎README.md

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@@ -18,6 +18,7 @@ Aims to simplify data visualization and creation of elegant thematic web maps wi
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- Supports ColorBrewer2 color ramps and custom color ramps (thanks to [chroma.js](https://github.com/gka/chroma.js))
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- Various SVG shapes/symbols for Point features
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- For size/width based symbology, min and max values can be adjusted to create a telling visualization with distinguishable classes
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- Handling of null/nodata feature attributes
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- Legend generation with options for:
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- class order (ascending/descending)
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- legend header (title)
@@ -62,6 +63,8 @@ const layer = L.dataClassification(data, {
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lineWidth: {min: 1, max: 15},
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colorRamp: 'OrRd',
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colorCustom: ['rgba(210,255,178,1)', '#fec44fff', 'f95f0eff'], // if specified, overrides colorRamp!
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noDataColor: '#101010',
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noDataIgnore: false,
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reverseColorRamp: false,
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middlePointValue: 0,
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classRounding: 2,
@@ -71,7 +74,8 @@ const layer = L.dataClassification(data, {
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legendTemplate: {
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highest: '{low} and above',
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middle: '{low} – {high}',
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lowest: 'below {high}'
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lowest: 'below {high}',
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nodata: 'No data'
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},
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unitModifier: {action: 'divide', by: 1000},
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style: {
@@ -107,6 +111,8 @@ const layer = L.dataClassification(data, {
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#### General options
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- `colorRamp <string>`: color ramp to use for symbology. Based on ColorBrewer2 color ramps (https://colorbrewer2.org/), included in Chroma.js. Custom colors (`colorCustom`) override this. (default: 'PuRd')
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- `colorCustom <array<string>>`: custom color ramp defined as an array, colors in formats supported by Chroma.js, with opacity support. A minimum of two colors are required. If defined, custom colors override `colorRamp`. Example: ['rgba(210,255,178,1)', '#fec44fff', 'f95f0eff']. Examples for yellow in different color formats: 'ffff00', '#ff0', 'yellow', '#ffff0055', 'rgba(255,255,0,0.35)', 'hsla(58,100%,50%,0.6)', chroma('yellow').alpha(0.5). For more formats, see: https://gka.github.io/chroma.js/. For an interactive color palette helper, see: https://gka.github.io/palettes/.
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- `noDataColor <string>`: fill color to use for features with null/nodata attribute values. In polygon, point-color and line-color modes. (default: '#606060')
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- `noDataIgnore <boolean>`: if true, features with null attribute values are not shown on the map. This also means the legend will not have a nodata classs (default: false)
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- `reverseColorRamp <boolean>`: if true, reverses the chosen color ramp, both in symbology on map and legend colors. Useful when you found a great looking colorramp (green to red), but would prefer reversed colors to match visual implications about colors: green implies positive, red implies negative phenomena. (default: false)
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- `middlePointValue <number>`: adjust boundary value of middle classes (only when classifying into even classes). Useful for symmetric classification of diverging data around 0. Only use a value within the range of the two middle classes.
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- `classRounding <integer>`: class boundary value rounding. When positive numbers are used for this option, class boundary values are rounded to x decimals, zero will round to whole numbers, while negative numbers will round values to the nearest 10, 100, 1000, etc. Example: with a setting of "1", a value of 254777.253 will get rounded up to 254777.3, with "0" it will be 254777, with "-2" it will become 254800. (default: null - no rounding happens, values are used as-is)
@@ -117,6 +123,7 @@ const layer = L.dataClassification(data, {
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- `highest <string>`: template for the upper end of classes, "highest value and above" (default: '{low} <')
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- `middle <string>`: template for rows in the middle, "low to high" (default: '{low} – {high}')
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- `lowest <string>`: template for the lower end of classes, "lowest value and below" (default: '< {high}')
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- `nodata <string>`: text to show for null/nodata class (default: 'No data')
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- `unitModifier <object>`: modifies the final class boundary values in order to multiply/divide them by a number. Useful for example when a dataset attribute is in metres, but kilometres would fit the legend better (786000 metres shown as 786 km). Purely visual, only affects legend. Happens after classRounding.
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- `action <string>`: ['divide'|'multiply'] action to take on the number specified by `by`. Required for `unitModifier`.
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- `by <number>`: a number to divide/multiply class boundary values with. Required for `unitModifier`.

‎examples/combined.html

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bottom: 0;
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left: 0;
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right: 0;
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}
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}
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/* Overriding Chrome's built-in CSS rules to avoid focus rectangle on clicking polygons on a Leaflet map */
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path.leaflet-interactive:focus {
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outline: none;
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}
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</style>
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</head>
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<body>
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layer.on('mousemove',e=>{
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e.target.getTooltip().setLatLng(e.latlng);
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});
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} else {
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layer.bindTooltip('<b>' + feature.properties.name + '</b><br> No data');
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layer.on('mousemove',e=>{
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e.target.getTooltip().setLatLng(e.latlng);
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});
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}
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}
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function onEachFeature(feature, layer) {
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layer.bindPopup(feature.properties.name);
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}
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window.testdata = L.dataClassification(d, {
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mode: 'quantile',
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classes: 5,
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field: 'density',
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colorRamp: 'YlGnBu',
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noDataColor: '#505050',
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legendAscending: false,
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reverseColorRamp: false,
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legendTitle: 'Density (pop/mi²)',
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classRounding: 1,
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classRounding: 1,
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onEachFeature: tooltip,
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// polygon outline styling example (standard L.Path styling options):
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style: {
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});
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//testdata3.bringToFront();
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map.fitBounds([[17, -170],[68, -65]]);
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map.fitBounds([[17, -150],[68, -65]]);
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var infopanel = L.control({position: 'bottomright'});
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infopanel.onAdd = function (map) {
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var div = L.DomUtil.create('div', 'info');
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div.innerHTML +=
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'<div style="display: flex; flex-direction: column; max-width: 500px; text-align: center;">' +
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'<div style="font-weight: bold; margin-bottom: 5px;">' +
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'Leaflet-dataclassification plugin demo page: "combined"' +
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'</div>'+
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'<div style="justify-content: center; ">' +
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'This is an example page showcasing some of the features of Leaflet plugin <i>leaflet-dataclassification</i> for three layers simultaneously. '+
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'Feature tooltips on hover (native feature of Leaflet) were added to provide an easy check of attribute values used. '+
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'<br><i>Note: population density for North Dakota has been manually removed to showcase handling of Null data (nodata) in feature attributes.</i>'+
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'<br><br>'+
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'Single-step data classification, symbology and legend creation for GeoJSON data powered thematic maps.'+
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'<br><br>'+
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'Project page: <a href="https://github.com/balladaniel/leaflet-dataclassification">https://github.com/balladaniel/leaflet-dataclassification</a>'
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'</div>'+
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'</div>';
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return div;
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}
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infopanel.addTo(map);
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</script>
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</body>

‎examples/data/us-states.geojson

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‎examples/lines_c.html

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map.fitBounds(testdata.getBounds());
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});
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var infopanel = L.control({position: 'bottomright'});
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infopanel.onAdd = function (map) {
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var div = L.DomUtil.create('div', 'info');
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div.innerHTML +=
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'<div style="display: flex; flex-direction: column; max-width: 500px; text-align: center;">' +
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'<div style="font-weight: bold; margin-bottom: 5px;">' +
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'Leaflet-dataclassification plugin demo page: "lines_color"' +
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'</div>'+
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'<div style="justify-content: center; ">' +
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'This is an example page showcasing some of the features of Leaflet plugin <i>leaflet-dataclassification</i>. '+
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'Feature tooltips on hover (native feature of Leaflet) were added to provide an easy check of attribute values used. '+
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'<br><br>'+
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'Single-step data classification, symbology and legend creation for GeoJSON data powered thematic maps.'+
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'<br><br>'+
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'Project page: <a href="https://github.com/balladaniel/leaflet-dataclassification">https://github.com/balladaniel/leaflet-dataclassification</a>'
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'</div>'+
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'</div>';
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return div;
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}
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infopanel.addTo(map);
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</script>
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</body>
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</html>

‎examples/lines_w.html

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map.fitBounds(testdata.getBounds());
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});
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var infopanel = L.control({position: 'bottomright'});
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infopanel.onAdd = function (map) {
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var div = L.DomUtil.create('div', 'info');
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div.innerHTML +=
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'<div style="display: flex; flex-direction: column; max-width: 500px; text-align: center;">' +
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'<div style="font-weight: bold; margin-bottom: 5px;">' +
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'Leaflet-dataclassification plugin demo page: "lines_width"' +
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'</div>'+
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'<div style="justify-content: center; ">' +
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'This is an example page showcasing some of the features of Leaflet plugin <i>leaflet-dataclassification</i>. '+
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'Feature tooltips on hover (native feature of Leaflet) were added to provide an easy check of attribute values used. '+
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'<br><br>'+
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'Single-step data classification, symbology and legend creation for GeoJSON data powered thematic maps.'+
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'<br><br>'+
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'Project page: <a href="https://github.com/balladaniel/leaflet-dataclassification">https://github.com/balladaniel/leaflet-dataclassification</a>'
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'</div>'+
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'</div>';
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return div;
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}
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infopanel.addTo(map);
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</script>
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</body>
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</html>

‎examples/points_c.html

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map.fitBounds(testdata.getBounds());
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});
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var infopanel = L.control({position: 'bottomleft'});
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infopanel.onAdd = function (map) {
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var div = L.DomUtil.create('div', 'info');
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div.innerHTML +=
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'<div style="display: flex; flex-direction: column; max-width: 500px; text-align: center;">' +
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'<div style="font-weight: bold; margin-bottom: 5px;">' +
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'Leaflet-dataclassification plugin demo page: "points_color"' +
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'</div>'+
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'<div style="justify-content: center; ">' +
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'This is an example page showcasing some of the features of Leaflet plugin <i>leaflet-dataclassification</i>. '+
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'Feature tooltips on hover (native feature of Leaflet) were added to provide an easy check of attribute values used. '+
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'<br><br>'+
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'Single-step data classification, symbology and legend creation for GeoJSON data powered thematic maps.'+
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'<br><br>'+
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'Project page: <a href="https://github.com/balladaniel/leaflet-dataclassification">https://github.com/balladaniel/leaflet-dataclassification</a>'
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'</div>'+
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'</div>';
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return div;
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}
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infopanel.addTo(map);
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</script>
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</html>

‎examples/points_s.html

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map.fitBounds(testdata.getBounds());
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});
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var infopanel = L.control({position: 'bottomright'});
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infopanel.onAdd = function (map) {
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var div = L.DomUtil.create('div', 'info');
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div.innerHTML +=
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'<div style="display: flex; flex-direction: column; max-width: 500px; text-align: center;">' +
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'<div style="font-weight: bold; margin-bottom: 5px;">' +
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'Leaflet-dataclassification plugin demo page: "points_size"' +
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'</div>'+
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'<div style="justify-content: center; ">' +
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'This is an example page showcasing some of the features of Leaflet plugin <i>leaflet-dataclassification</i>. '+
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'Feature tooltips on hover (native feature of Leaflet) were added to provide an easy check of attribute values used. '+
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'<br><br>'+
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'Single-step data classification, symbology and legend creation for GeoJSON data powered thematic maps.'+
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'<br><br>'+
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'Project page: <a href="https://github.com/balladaniel/leaflet-dataclassification">https://github.com/balladaniel/leaflet-dataclassification</a>'
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'</div>'+
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'</div>';
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return div;
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}
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infopanel.addTo(map);
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</script>
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</body>
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</html>

‎examples/polygons.html

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bottom: 0;
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left: 0;
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right: 0;
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}
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}
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/* Overriding Chrome's built-in CSS rules to avoid focus rectangle on clicking polygons on a Leaflet map */
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path.leaflet-interactive:focus {
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outline: none;
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}
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</style>
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</head>
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<body>
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map.fitBounds([[-48, 165], [-33, 179]]);
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});
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var infopanel = L.control({position: 'bottomright'});
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infopanel.onAdd = function (map) {
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var div = L.DomUtil.create('div', 'info');
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div.innerHTML +=
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'<div style="display: flex; flex-direction: column; max-width: 500px; text-align: center;">' +
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'<div style="font-weight: bold; margin-bottom: 5px;">' +
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'Leaflet-dataclassification plugin demo page: "polygons"' +
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'</div>'+
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'<div style="justify-content: center; ">' +
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'This is an example page showcasing some of the features of Leaflet plugin <i>leaflet-dataclassification</i>. '+
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'Feature tooltips on hover (native feature of Leaflet) were added to provide an easy check of attribute values used. '+
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'<br><br>'+
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'Single-step data classification, symbology and legend creation for GeoJSON data powered thematic maps.'+
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'<br><br>'+
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'Project page: <a href="https://github.com/balladaniel/leaflet-dataclassification">https://github.com/balladaniel/leaflet-dataclassification</a>'
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'</div>'+
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'</div>';
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return div;
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}
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infopanel.addTo(map);
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</script>
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</body>
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</html>

‎leaflet-dataclassification.css

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float: left;
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margin-right: 8px;
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opacity: 0.7;
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}
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.legendDataRow {
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display: flex;
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flex-direction: row;
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align-items: center
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}

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