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attributes-ui.mjs
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attributes-ui.mjs
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import { loadModules, setDefaultOptions } from 'https://unpkg.com/esri-loader/dist/esm/esri-loader.js';
(async () => {
setDefaultOptions({
css: true,
// url: 'http://localhost:8000/buildOutput/init.js',
// url: 'http://jscore.esri.com/debug/4.16/dojo/dojo.js',
// version: 'next',
});
const [
Map,
MapView,
FeatureLayer,
generateHistogram,
HistogramRangeSlider,
Histogram,
uniqueValues,
Legend,
colorRamps,
Color,
viewColorUtils,
LabelClass,
CIMSymbol,
cimSymbolUtils,
] = await loadModules([
"esri/Map",
"esri/views/MapView",
"esri/layers/FeatureLayer",
"esri/smartMapping/statistics/histogram",
"esri/widgets/HistogramRangeSlider",
"esri/widgets/Histogram",
"esri/smartMapping/statistics/uniqueValues",
"esri/widgets/Legend",
"esri/smartMapping/symbology/support/colorRamps",
"esri/smartMapping/symbology/color",
"esri/views/support/colorUtils",
"esri/layers/support/LabelClass",
"esri/symbols/CIMSymbol",
"esri/symbols/support/cimSymbolUtils",
]);
// data urls
var datasets = {
'Tucson Demographics': "35fda63efad14a7b8c2a0a68d77020b7_0",
'Citclops Water': "8581a7460e144ae09ad25d47f8e82af8_0",
'Seattle Bike Facilities': "f4f509fa13504fb7957cef168fad74f0_1",
'NYC bags': "7264acdf886941199f7c01648ba04e6b_0",
'Black Rat Range': "28b0a8a0727d4cc5a2b9703cf6ca4425_0",
'Traffic Circles': "717b10434d4945658355eba78b66971a_6",
'King County Photos': "383878300c4c4f8c940272ba5bfcce34_1036",
}
// dataset switcher
var datasetList = document.getElementById('datasetList');
// populate dropdown with all attributes
for (let [key, value] of Object.entries(datasets)) {
// create new option element and add it to the dropdown
var opt = document.createElement('option');
opt.text = key;
opt.value = value;
datasetList.appendChild(opt);
}
datasetList.addEventListener('change', async event => {
await loadDataset({ datasetId: event.target.value, env: 'prod' });
});
// track state
var state = {};
function initState() {
state = {
dataset: null,
layer: null,
view: null,
widgets: [],
bgColor: null,
legend: null,
categoricalMax: 7,
fieldName: null,
}
}
const DATASET_FIELD_UNIQUE_VALUES = {}; // cache by field name
// URL params
const params = new URLSearchParams(window.location.search);
var env = 'prod';
if (Array.from(params).length != 0) {
var datasetId = params.get('dataset');
const datasetSlug = params.get('slug');
env = params.get('env');
await loadDataset({ datasetId, datasetSlug, env });
} else {
var datasetId = datasetList.options[datasetList.selectedIndex].value;
await loadDataset({ datasetId, env });
}
//
// FILTERING
//
// add a filter, choosing the appropriate widget based on fieldType and various properties
async function addFilter({event = null, fieldName = null, fieldStats = null}) {
let {view, layer} = state;
// if no fieldName is passed directly, get it from the attribute selection event
if (fieldName == null) fieldName = event.currentTarget.dataset.field;
const field = await getDatasetField(fieldName);
let filter = document.createElement('div');
filter.classList.add('filterDiv');
fieldStats = fieldStats ? fieldStats : field.statistics;
filter.innerHTML = await generateLabel(field, fieldStats);
// actions
let icons = document.createElement('span');
icons.innerHTML = " 🅧 ";
icons.onclick = removeFilter;
icons.classList.add('filterIcons');
let tooltip = document.createElement('span');
tooltip.classList.add('tooltip')
tooltip.innerText = "Delete filter";
filter.appendChild(icons);
icons.insertBefore(tooltip, icons.firstChild)
let filtersList = document.getElementById('filtersList');
filtersList.appendChild(filter);
document.getElementById('filtersCount').innerHTML = `Applying ${filtersList.children.length} filters`;
let container = document.createElement('div');
filter.appendChild(container);
const numberLike = await datasetFieldIsNumberLike(fieldName);
// (pseudo-)categorical - most records are covered by a limited # of unique values
// or all other string values
if ((field.simpleType === 'string' && !numberLike)) {
// value list
var widget = await makeStringWidget({ fieldName, container, slider: true });
}
// numerics and dates
else {
widget = await makeHistogramWidget({ fieldName, container, slider: true });
container.classList.add('histogramWidget');
// set whereClause attribute
let whereClause = widget.generateWhereClause(fieldName);
// whereClause = whereClause.replace(fieldName, `CAST(${fieldName} AS FLOAT)`); // for number-like fields
widget.container.setAttribute('whereClause', whereClause);
}
// if (field.simpleType === 'date') {
// // Time slider
// widget = await makeTimeSliderWidget({ fieldName, container, slider: true });
// }
// scroll the sidebar down to show the most recent filter and keep the attribute search visible
let sidebar = document.getElementById('sidebar')
sidebar.scrollTop = sidebar.scrollHeight;
widget.container.setAttribute('fieldName', fieldName);
widget.container.setAttribute('numberLike', numberLike);
state = {...state, view, layer};
}
//
// WIDGETS
//
// create a histogram
async function makeHistogram ({fieldName, container, slider = false, where = null, features = null }) {
// wrap in another container to handle height without fighting w/JSAPI and rest of sidebar
const parentContainer = container;
let newcontainer = document.createElement('div');
parentContainer.appendChild(newcontainer);
const numberLike = await datasetFieldIsNumberLike(fieldName);
if (!where) {
where = "1=1";
}
if (numberLike) {
where = where.replace(fieldName, `CAST(${fieldName} AS FLOAT)`); // for number-like fields
}
try {
let params = {
layer: state.layer,
field: fieldName,
numBins: 30,
where, // optional where clause
features // optional existing set of features
};
let values, source, coverage;
try {
values = await generateHistogram(params);
source = 'widgets';
coverage = 1;
} catch(e) {
try {
// histogram generation failed with automated server call, try using features from server query
console.warn('Histogram generation failed with automated server call, try using features from server query\n', e);
// params.features = (await layer.queryFeatures()).features;
// const featureCount = await layer.queryFeatureCount();
// if (params.features.length != featureCount) throw new Error('params.features.length != featureCount');
const { features, exceededTransferLimit } = await state.layer.queryFeatures();
if (exceededTransferLimit) throw new Error('Exceeded server limit querying features');
params.features = features;
values = await generateHistogram(params);
source = 'layerQuery';
coverage = params.features.length / featureCount;
} catch(e) {
// histogram generation failed with automated server call, try using features from server query
console.warn('Histogram generation failed with server query, try reconstructing from unique values\n', e);
try {
let uniqueValues = (await getDatasetFieldUniqueValues(fieldName)).values;
let domain = [Math.min(...uniqueValues.map(a => a.value)),
Math.max(...uniqueValues.map(a => a.value))]
// manually reconstruct a feature values array from the unique values and their counts -
let arr = reconstructDataset(uniqueValues);
// use d3 to bin histograms
let d3bins = d3.histogram() // create layout object
.domain([Math.min(...uniqueValues.map(a => a.value)),
Math.max(...uniqueValues.map(a => a.value))]) // to cover range
.thresholds(29) // separated into 30 bins
(arr); // pass the array
// convert the d3 bins array to a bins object
var bins = [];
for (let x = 0; x < d3bins.length; x++) {
bins.push({
minValue: d3bins[x]['x0'],
maxValue: d3bins[x]['x1'],
count: d3bins[x].length,
});
}
// put the bins in the params object
values = {
'bins': bins,
'minValue': Math.min(...uniqueValues.map(a => a.value)),
'maxValue': Math.max(...uniqueValues.map(a => a.value)),
}
const featureCount = arr.length;
source = 'layerQuery';
coverage = 1;
} catch(e) {
// histogram generation failed with unique values, try using features in layer view
console.warn('Histogram generation failed with unique values, try using features in layer view\n', e);
let layerView = await view.whenLayerView(layer);
params.features = (await layerView.queryFeatures()).features;
// const featureCount = await layer.queryFeatureCount();
values = await generateHistogram(params);
source = 'layerView';
}
}
}
// Determine if field is an integer
const field = getDatasetField(fieldName);
const integer = await datasetFieldIsInteger(fieldName);
const widget =
slider ?
// Histogram range slider widget
new HistogramRangeSlider({
bins: values.bins,
min: values.minValue,
max: values.maxValue,
values: [values.minValue, values.maxValue],
precision: integer ? 0 : 2,
container: container,
excludedBarColor: "#dddddd",
rangeType: "between",
labelFormatFunction: (value, type) => {
// apply date formatting to histogram
if (field.simpleType == 'date') {
return formatDate(value);
}
return value;
}
})
:
// plain histogram, for miniHistogram nested in timeSlider
new Histogram({
bins: values.bins,
min: values.minValue,
max: values.maxValue,
container: container,
rangeType: "between",
})
;
return { widget, values, source, coverage };
}
catch(e) {
console.log('histogram generation failed', e);
return {};
}
}
// make and place a histogram
async function makeHistogramWidget({ fieldName, container = null, slider = true }) {
var {widgets, layer} = state;
const wrapper = document.createElement('div');
wrapper.classList.add('histogramWidget');
container = container ? container : document.getElementById('filters');
container.appendChild(wrapper);
// filter by existing widgets on creation
let features;
if (widgets.length > 0) {
const where = concatWheres({ server: true });
// query layer for all features in the other layers, filtered by the state of current layer
features = (await layer.queryFeatures( { where, outFields: [fieldName] })).features;
}
const histogram = await makeHistogram({ fieldName, features, container: wrapper, slider: true });
if (histogram.widget) {
wrapper.widget = histogram.widget;
// set event handler to update map filter and histograms when handles are dragged
histogram.widget.on(["thumb-change", "thumb-drag", "segment-drag"], event => {
updateLayerView(fieldName, histogram.widget);
updateWidgets(fieldName, histogram.widget);
});
// register widget
state.widgets.push(histogram.widget);
}
return histogram.widget;
}
// create a value list of checkboxes
async function createValueList ({ fieldName, container, onUpdateValues }) {
var {dataset, layer} = state;
container.classList.add('filter');
const list = document.createElement('div');
const header = document.createElement('div');
// header.innerText = 'Values';
header.classList.add('sidebarItemHeader');
list.appendChild(header);
const checkboxList = document.createElement('div');
list.appendChild(checkboxList);
const field = getDatasetField(fieldName);
const stats = await getDatasetFieldUniqueValues(fieldName, layer);
// if (!stats.topValues || stats.topValues.length === 0) {
// return {};
// }
let checkboxListenerDisabled = false;
function addValueListCheckbox (value, checkboxes) {
const checkbox = document.createElement('calcite-checkbox');
checkbox.value = JSON.stringify(value);
// const labelText = document.createTextNode(`${value.value} (${(value.pct * 100).toFixed(2)}% of records)`);
const labelText = document.createElement('span');
// handle null-ish, date, and other field formatting
if (value.value == null || (typeof value.value === 'string' && value.value.trim() === '')) {
labelText.innerHTML = '<span style="color: gray">No value</span>';
} else if (field.simpleType === 'date') {
labelText.innerHTML = formatDate(value.value);
} else {
labelText.innerHTML = value.value;
}
const labelSubText = document.createElement('span');
labelSubText.classList.add('subText');
labelSubText.innerText = value.pct != null ? `${(value.pct * 100).toFixed(2)}%` : '';
const onlyLink = document.createElement('a');
onlyLink.classList.add('valueListSideLink');
onlyLink.href = '#';
onlyLink.innerText = 'only';
const label = document.createElement('label');
label.classList.add('valueListCheckbox');
label.appendChild(checkbox);
label.appendChild(labelText);
label.appendChild(labelSubText);
label.appendChild(onlyLink);
checkbox.addEventListener('calciteCheckboxChange', (event) => {
if (!checkboxListenerDisabled) {
onUpdateValues({ checkboxes, event });
}
});
onlyLink.addEventListener('click', event => {
// disable change listener to keep it from firing as all checkboxes are updated
checkboxListenerDisabled = true;
// check selected box and un-check all others
checkboxes.forEach(c => {
c.checked = c === checkbox ? true : false;
});
// re-enable listener and invoke update handler just once
checkboxListenerDisabled = false;
onUpdateValues({ checkboxes, event });
});
checkboxList.appendChild(label);
return checkbox;
}
// clear all link
const clearLink = document.createElement('a');
clearLink.classList.add('valueListSideLink');
clearLink.href = '#';
clearLink.innerText = 'clear';
header.appendChild(clearLink);
clearLink.addEventListener('click', event => {
// disable change listener to keep it from firing as all checkboxes are updated
checkboxListenerDisabled = true;
// un-check all checkboxes
checkboxes.forEach(c => c.checked = false);
// re-enable listener and invoke update handler just once
checkboxListenerDisabled = false;
onUpdateValues({ checkboxes, event });
});
const checkboxes = [];
checkboxes.push(...stats.topValues.map(value => addValueListCheckbox(value, checkboxes)));
container.appendChild(list);
// search box
if (stats.uniqueCount > stats.topValues.length) {
const searchBox = document.createElement('input');
searchBox.classList.add('valueListSearchBox');
searchBox.type = 'text';
searchBox.placeholder = `Search ${stats.uniqueCount} ${fieldName} values...`;
const wrapper = document.createElement('div');
wrapper.classList.add('valueListSearchBoxWrapper');
list.appendChild(searchBox);
function searchSource(params) {
return async function doSearch(query, callback) {
const where = field.simpleType === 'date' ?
`CAST(${fieldName} AS VARCHAR(256)) LIKE lower('%${query}%')` : // convert dates to strings
`lower(${fieldName}) LIKE lower('%${query}%')`
const { features } = await layer.queryFeatures({
// where: `lower(${fieldName}) LIKE lower('%${query}%')`,
// where: `CAST(${fieldName} AS VARCHAR(256)) LIKE lower('%${query}%')`,
where,
orderByFields: [fieldName],
outFields: [fieldName],
returnDistinctValues: true,
num: 10
});
// de-dupe results (by turning into set)
const vals = new Set(features
.map(f => f.attributes[fieldName])
.map(v => typeof v === 'string' ? v.trim() : v)
.filter(value => {
// exclude any results already selected in checkboxes
return !checkboxes
.filter(c => c.checked)
.map(c => JSON.parse(c.value))
.map(v => v.value)
.includes(value);
})
);
// return values
callback([...vals].map(value => ({
value,
label: field.simpleType === 'date' ? formatDate(value) : value
})));
};
}
autocomplete(searchBox, { hint: false, clearOnSelected: false, }, [{
source: searchSource({ hitsPerPage: 5 }),
displayKey: 'label',
templates: {
suggestion: function(suggestion) {
return suggestion.label;
}
}
}]).on('autocomplete:selected', function(event, suggestion, context) {
let checkbox = checkboxes
.filter(c => !c.checked)
.find(c => JSON.parse(c.value).value === suggestion.value);
if (!checkbox) {
checkbox = addValueListCheckbox(suggestion, checkboxes);
checkboxes.push(checkbox);
}
checkbox.checked = true;
// TODO: why is this necessary? calcite event listener doesn't fire when checkbox added and set to checked in this flow
onUpdateValues({ checkboxes });
});
}
return { checkboxes, fieldStats: stats };
}
// make and place a value list of checkboxes
async function makeStringWidget({ fieldName, container = null, slider = true }) {
container.classList.add('valueListWidget');
const field = getDatasetField(fieldName);
// Build filter/where clause and update layer
const onCheckboxChange = ({ checkboxes }) => {
let checked = checkboxes.filter(c => c.checked).map(c => JSON.parse(c.value));
let whereClause = '1=1';
if (checked.length > 0) {
const hasNull = checked.find(c => c.value == null) ? true : false;
checked = checked.filter(c => c.value != null);
let whereVals;
if (field.simpleType === 'date') {
whereVals = checked.map(c => +new Date(c.value));
whereClause = whereVals.map(v => `${fieldName} = ${v}`).join(' OR ');
} else {
whereVals = checked.map(c => {
if (typeof c.value === 'string') {
return `'${c.value}'`
} else {
return c.value;
}
});
whereClause = `${fieldName} IN (${whereVals.join(', ')})`;
}
if (hasNull) {
whereClause = whereVals ? `${whereClause} OR ` : '';
whereClause = `${fieldName} IS NULL`; // need special SQL handling for null vales
}
}
container.setAttribute('whereClause', whereClause);
const where = concatWheres({ server: false });
updateLayerViewEffect({ where });
};
const { fieldStats } = await createValueList({ fieldName, container, onUpdateValues: onCheckboxChange });
fieldStats.container = container;
// register widget
state.widgets.push(fieldStats)
return fieldStats;
}
//
// UDPATE THINGS
//
// update layerview filter based on widget, throttled
const updateLayerView = _.throttle(
async (fieldName, widget, value = null) => {
let whereClause;
if (widget.label === "Histogram Range Slider") {
whereClause = widget.generateWhereClause(fieldName);
// whereClause = whereClause.replace(fieldName, `CAST(${fieldName} AS FLOAT)`); // for number-like fields
}
if (widget.label === "TimeSlider") {
// instead of unix timestamps, use SQL date formatting, as expected by layer.queryFeatures()
whereClause = `${fieldName} BETWEEN DATE ${formatSQLDate(value.start)} AND DATE ${formatSQLDate(value.end)}`;
}
// set whereClause attribute
widget.container.setAttribute('whereClause', whereClause);
const where = concatWheres({ server: false });
await updateLayerViewEffect({ where });
},
100,
{trailing: false}
);
// update the bins of all histograms except the current widget, throttled
const updateWidgets = _.throttle(
async (fieldName, currentWidget) => {
let widgets = Array.from(listWidgetElements());
// if there's only one widget, skip this
if (widgets.length === 1) return
// collect other widgets' fieldNames, skipping the current widget (handles nested widgets too)
let otherWidgets = widgets.filter(w => w.getAttribute('fieldname') != fieldName);
let fieldNames = otherWidgets.map(w => w.getAttribute('fieldname'));
// convert to a set to remove any duplicates (nested widgets), then back to array
fieldNames = [...new Set(fieldNames)];
if (fieldNames.length == 0) return;
let whereClause = currentWidget.container.getAttribute('whereClause');
const numberLike = currentWidget.container.getAttribute('numberLike') === "true";
if (numberLike) {
whereClause = whereClause.replace(fieldName, `CAST(${fieldName} AS FLOAT)`); // for number-like fields
}
try {
// query layer for all features in the other layers, filtered by the state of current layer
var { features } = await state.layer.queryFeatures( { where: whereClause, outFields: fieldNames });
} catch(e) {
throw new Error(`Failed to query layer for ${fieldName}: ${e}`)
}
try {
// update other widgets, passing in the filtered feature set
throttledUpdateOthers(otherWidgets, features);
} catch(e) {
throw new Error('Tried to update other widgets: '+e)
}
},
100,
{trailing: false}
);
// update the bins of a histogram
async function updateHistogram(widget, fieldName, features, { numberLike } = {}) {
var {layer, view} = state;
let values;
if (features) {
let valueExpression;
let sqlExpression;
if (numberLike) {
// copy features and cast string field to number
// features = features.map(f => {
// const clone = f.clone();
// const value = Number(clone.getAttribute(fieldName));
// clone.setAttribute(fieldName, value);
// // clone.sourceLayer = null;
// return clone;
// });
valueExpression = `Number($feature.${fieldName})`;
sqlExpression = `CAST(${fieldName} AS FLOAT})`;
}
let params = {
layer,
view,
features,
field: valueExpression ? null : fieldName,
valueExpression,
// field: fieldName,
// sqlExpression,
numBins: 30,
// minValue: widget.min,
// maxValue: widget.max,
// values: [widget.values[0], widget.values[1]]
// values: [widget.min, widget.max]
// sqlWhere: concatWheres()
// sqlWhere: where
};
try {
values = await generateHistogram(params);
if (values.bins) {
widget.bins = values.bins;
}
} catch(e) {
console.log('e:', e)
}
}
}
function updateOthers(otherWidgets, features) {
for (const widget of otherWidgets) {
// can't update TimeSliders
if (widget.label == "TimeSlider") continue;
const numberLike = widget.getAttribute('numberLike') === "true";
updateHistogram(widget.widget, widget.getAttribute('fieldName'), features, { numberLike });
}
}
const throttledUpdateOthers = _.throttle(updateOthers, 100, {trailing: false});
//
// UTILITY FUNCTIONS
//
// list all known widget DOM elements
function listWidgetElements() {
return [...document.getElementById('filtersList').querySelectorAll('[whereClause]')];
}
// concatenate all the where clauses from all the widgets
function concatWheres( { server = false } = {}) {
let whereClause = '';
let widgets = listWidgetElements();
// generate master here clause with simple string concatenation
for (const [x, widget] of widgets.entries()) {
if (x > 0) whereClause += ' AND ';
let widgetWhere = widget.getAttribute('whereClause');
// explicit cast for number-likes, for feature layer (server-side) queries ONLY
// skip for feature layer view (client-side) queries, which work *without* the cast (but fail with it)
const numberLike = widget.getAttribute('numberLike') === "true";
if (server && numberLike) {
const fieldName = widget.getAttribute('fieldName');
widgetWhere = widgetWhere.replace(fieldName, `CAST(${fieldName} AS FLOAT)`); // for number-like fields
}
whereClause += '(' + widgetWhere + ')';
// whereClause += '(' + widget.getAttribute('whereClause') + ')';
}
return whereClause;
}
async function removeFilter(event, fieldName = null) {
fieldName = fieldName ? fieldName : event.currentTarget.dataset.field;
let filter = event.currentTarget.parentElement;
let filtersList = filter.parentElement;
filter.remove();
document.getElementById('filtersCount').innerHTML = `Applying ${filtersList.children.length} filters`;
updateLayerViewEffect();
}
// draw whole map from scratch
async function drawMap() {
var {dataset, layer, view} = state;
const darkModeCheckbox = document.querySelector('#darkMode calcite-checkbox');
const map = new Map({
// choose a light or dark background theme as default
basemap: darkModeCheckbox?.checked ? "dark-gray-vector" : "gray-vector",
layers: layer,
});
if (view) {
// update existing view, then exit
view.map = map;
state = {...state, view}
// explicitly wait for bgColor to be updated, then update the layerView
await getBgColor().then(color => {
state.bgColor = color;
updateLayerViewEffect();
});
return view;
}
var view = new MapView({
container: "viewDiv",
map: map,
extent: getDatasetExtent(dataset),
ui: { components: [] }
});
// add toggle checkboxes
view.ui.add('zoomToData', 'top-right');
const zoomToDataCheckbox = document.querySelector('#zoomToData calcite-checkbox');
zoomToDataCheckbox.addEventListener('calciteCheckboxChange', () => {
updateLayerViewEffect();
});
view.ui.add('darkMode', 'top-right');
darkModeCheckbox.addEventListener('calciteCheckboxChange', async () => {
state.view = await drawMap();
autoStyle({fieldName: state.fieldName})
});
view.ui.add('labels', 'top-right');
const labelsCheckbox = document.querySelector('#labels calcite-checkbox');
labelsCheckbox.addEventListener('calciteCheckboxChange', () => {
autoStyle({fieldName: state.fieldName})
});
// put vars on window for debugging
Object.assign(window, { state, map, getDatasetField, getDatasetFieldUniqueValues, /*histogram, histogramValues,*/ generateHistogram, HistogramRangeSlider, uniqueValues });
// Dataset info
document.querySelector('#datasetName').innerHTML = dataset.attributes.name;
document.querySelector('#orgName').innerHTML = dataset.attributes.orgName || '';
document.querySelector('#recordCount').innerHTML = `${dataset.attributes.recordCount} records`;
// update state
state.view = view;
// bgColor needs state.view to be set first
state.bgColor = await getBgColor();
return view;
}
// update layerview filter based on histogram widget, throttled
const updateLayerViewWithHistogram = _.throttle(
async (where) => {
await updateLayerViewEffect({ where });
},
50
);
async function loadDataset (args) {
// reset state
initState();
var dataset, layer;
if (args.url) { // dataset url provided directly
const datasetURL = args.url;
try {
// dataset = (await fetch(datasetURL).then(r => r.json()));
dataset = {attributes: {url: args.url}}
} catch(e) { console.log('failed to load dataset from url:', args.url, e); }
} else if (args.datasetId) { // dataset id provided directly
// https://opendataqa.arcgis.com/api/v3/datasets/97a641ac39904f349fb5fc25b94207f6
const datasetURL = `https://opendata${args.env === 'qa' ? 'qa' : ''}.arcgis.com/api/v3/datasets/${args.datasetId}`;
try {
dataset = (await fetch(datasetURL).then(r => r.json())).data;
} catch(e) { console.log('failed to load dataset from id', args.datasetId, e); }
} else if (args.datasetSlug) { // dataset slug provided as alternate
// https://opendata.arcgis.com/api/v3/datasets?filter%5Bslug%5D=kingcounty%3A%3Aphoto-centers-for-2010-king-county-orthoimagery-project-ortho-image10-point
const filter = `${encodeURIComponent('filter[slug]')}=${encodeURIComponent(args.datasetSlug)}`
const datasetURL = `https://opendata${args.env === 'qa' ? 'qa' : ''}.arcgis.com/api/v3/datasets?${filter}`;
try {
dataset = (await fetch(datasetURL).then(r => r.json())).data[0];
} catch(e) { console.log('failed to load dataset from slug', args.datasetSlug, e); }
}
// initialize a new layer
const url = dataset.attributes.url;
layer = new FeatureLayer({
renderer: {type: 'simple'},
url,
minScale: 0,
maxScale: 0,
});
// update state
state = {...state, layer, dataset};
// clear filters list
clearFilters();
// clear widgets list
state.widgets = [];
// update attributes lists
updateAttributeList('#filterAttributeList', () => addFilter({event}) );
updateAttributeList('#styleAttributeList', () => autoStyle({event}) );
let filterAttributeSearchElement = document.getElementById("filterAttributeSearch")
filterAttributeSearchElement.addEventListener("input", filterAttributeSearchInput);
filterAttributeSearchElement.addEventListener("change", filterAttributeSearchChange); // clear input button
let filterPlaceholderText = `Search ${dataset.attributes.fields.length} Attributes by Name`;
filterAttributeSearchElement.setAttribute('placeholder', filterPlaceholderText);
let styleAttributeSearchElement = document.getElementById("styleAttributeSearch")
styleAttributeSearchElement.addEventListener("input", styleAttributeSearchInput);
styleAttributeSearchElement.addEventListener("change", styleAttributeSearchChange); // clear input button
let stylePlaceholderText = `Search ${dataset.attributes.fields.length} Attributes by Name`;
styleAttributeSearchElement.setAttribute('placeholder', stylePlaceholderText);
state.usePredefinedStyle = false; // disable for now
// draw map once before autoStyling because getBgColor() requires an initialized layerView object
state.view = await drawMap();
autoStyle({}); // guess at a style for this field
}
// manually reconstruct a feature values array from unique values and their counts
function reconstructDataset(values) {
// normalize array length to 1000, as precision isn't as important as speed here
const divisor = state.dataset.attributes.recordCount / 1000;
// const divisor = 1; // alternately, use the whole set
let arr = [];
for (let x = 0; x < values.length; x++) {
for (let y = 0; y < Math.ceil(values[x].count/divisor); y++) {
arr.push(values[x].value);
};
}
return arr;
}
// https://stackoverflow.com/questions/6122571/simple-non-secure-hash-function-for-javascript
function getHash(s) {
var hash = 0;
if (s.length == 0) {
return hash;
}
for (var i = 0; i < s.length; i++) {
var char = s.charCodeAt(i);
hash = ((hash<<5)-hash)+char;
hash = hash & hash; // Convert to 32bit integer
}
return Math.abs(hash);
}
//
// STYLING
//
// determine whether the map background is dark or light
async function getBgColor() {
const {view, layer} = state;
try {
// make sure there's a layerView, then
var bgColor = view.whenLayerView(layer).then(
// get and return the theme
async () => await viewColorUtils.getBackgroundColorTheme(view).then(theme => theme));
} catch(e) {
console.warn(`Couldn't detect basemap color theme - tab must be in foreground. Choosing "light."\n`, e)
bgColor = "light"; // set default bgColor
}
return bgColor;
}
// Choose symbology based on various dataset and theme attributes
async function autoStyle ({event = null, fieldName = null}) {
var {dataset, layer, view, usePredefinedStyle} = state;
// set colors
// get basemap color theme: "light" or "dark"
var bgColor = await getBgColor();
state.bgColor = bgColor;
// choose default colors based on background theme – dark on light, light on dark
// use rgb values because CIMSymbols don't understand web color names
var fillColor = bgColor == "dark" ? [0,196,210,255] : [173,216,230,255]; // lightblue and steelblue
var strokeColor = bgColor == "dark" ? [70,130,180,255] : [70,130,180,255]; // steelblue and white
// bad-value colors
var badStrokeColor = geotype == "line" ? bgColor == "dark" ? [128,128,128,255] : [64,64,64,255] : [128,128,128,255]; // grey outlines
var badFillColor = [255,255,255,255]; // white fills
// others color
var otherStrokeColor = [128,128,128,255]; // grey
var otherFillColor = [192,192,192,255]; // light grey
var symbol;
var renderer = {
type: "simple", // autocasts as new SimpleRenderer()
visualVariables: [],
};
const geometryType = dataset.attributes.geometryType;
var geotype = (geometryType == 'esriGeometryPoint') ? 'point'
: (geometryType == 'esriGeometryMultiPoint') ? 'point'
: (geometryType == 'esriGeometryPolygon') ? 'polygon'
: (geometryType == 'esriGeometryLine') ? 'line'
: (geometryType == 'esriGeometryPolyline') ? 'line'
: geometryType;
// SET GEOMETRY
if (geotype === 'point') {
// use CIMSymbol so we can have sub-pixel outline widths
var cimsymbol = new CIMSymbol({
data: {
type: "CIMSymbolReference",
symbol: {
type: "CIMPointSymbol",
symbolLayers: [{
type: "CIMVectorMarker",
enable: true,
size: 16,
frame: {
xmin: 0,
ymin: 0,
xmax: 14,
ymax: 14
},
markerGraphics: [{
type: "CIMMarkerGraphic",
geometry: {
// circle geo taken from https://developers.arcgis.com/javascript/latest/sample-code/sandbox/index.html?sample=cim-primitive-overrides
rings: [
[
[8.5, 0.2],[7.06, 0.33],[5.66, 0.7],[4.35, 1.31],[3.16, 2.14],[2.14, 3.16],[1.31, 4.35],[0.7, 5.66],[0.33, 7.06],[0.2, 8.5],[0.33, 9.94],[0.7, 11.34],[1.31, 12.65],[2.14, 13.84],[3.16, 14.86],[4.35, 15.69],[5.66, 16.3],[7.06, 16.67],[8.5, 16.8],[9.94, 16.67],[11.34, 16.3],[12.65, 15.69],[13.84, 14.86],[14.86, 13.84],[15.69, 12.65],[16.3, 11.34],[16.67, 9.94],[16.8, 8.5],[16.67, 7.06],[16.3, 5.66],[15.69, 4.35],[14.86, 3.16],[13.84, 2.14],[12.65, 1.31],[11.34, 0.7],[9.94, 0.33],[8.5, 0.2]
]
]},
symbol: {
type: "CIMPolygonSymbol",
symbolLayers: [
{
type: "CIMSolidStroke",
width: .45,
color: strokeColor,
},
{
type: "CIMSolidFill",
color: fillColor,
},
]
}
}]
}]
}
}
});
symbol = cimsymbol;
} else if (geotype === 'line') {
symbol = {
type: 'simple-line',
width: '2px',
color: strokeColor,
};
} else if (geotype === 'polygon') {
symbol = {
type: 'simple-fill',
color: fillColor,
outline: {
color: strokeColor,
width: 0.5,
},
};
}
// check for fieldName in args, the event object,