diff --git a/umap/static/umap/js/modules/global.js b/umap/static/umap/js/modules/global.js
index f42ce016..49f2822b 100644
--- a/umap/static/umap/js/modules/global.js
+++ b/umap/static/umap/js/modules/global.js
@@ -5,6 +5,7 @@ import Caption from './caption.js'
 import { Panel, EditPanel, FullPanel } from './ui/panel.js'
 import Dialog from './ui/dialog.js'
 import Tooltip from './ui/tooltip.js'
+import Rules from './rules.js'
 import * as Utils from './utils.js'
 import { SCHEMA } from './schema.js'
 import { Request, ServerRequest, RequestError, HTTPError, NOKError } from './request.js'
@@ -43,6 +44,7 @@ window.U = {
   Panel,
   Request,
   RequestError,
+  Rules,
   SCHEMA,
   ServerRequest,
   SyncEngine,
diff --git a/umap/static/umap/js/modules/rules.js b/umap/static/umap/js/modules/rules.js
new file mode 100644
index 00000000..0c60dbe1
--- /dev/null
+++ b/umap/static/umap/js/modules/rules.js
@@ -0,0 +1,175 @@
+import { DomUtil, DomEvent, stamp } from '../../vendors/leaflet/leaflet-src.esm.js'
+import * as Utils from './utils.js'
+import { translate } from './i18n.js'
+
+class Rule {
+  constructor(map, condition = '', options = {}) {
+    this.map = map
+    this.condition = condition
+    this.parse()
+    this.options = options
+    let isDirty = false
+    Object.defineProperty(this, 'isDirty', {
+      get: () => {
+        return isDirty
+      },
+      set: (status) => {
+        isDirty = status
+        if (status) {
+          this.map.isDirty = status
+        }
+      },
+    })
+  }
+
+  render(fields) {
+    this.map.render(fields)
+  }
+
+  parse() {
+    let vars = []
+    if (this.condition.includes('!=')) {
+      this.operator = (our, other) => our != other
+      vars = this.condition.split('!=')
+    } else if (this.condition.includes('=')) {
+      this.operator = (our, other) => our === other
+      vars = this.condition.split('=')
+    }
+    if (vars.length != 2) this.operator = undefined
+    this.key = vars[0]
+    this.expected = vars[1]
+  }
+
+  match(props) {
+    if (!this.operator) return false
+    return this.operator(this.expected, props[this.key])
+  }
+
+  getMap() {
+    return this.map
+  }
+
+  getOption(option) {
+    return this.options[option]
+  }
+
+  edit() {
+    const options = [
+      [
+        'condition',
+        {
+          handler: 'BlurInput',
+          label: L._('Condition'),
+          placeholder: translate('key=value or key!=value'),
+        },
+      ],
+      'options.color',
+      'options.iconClass',
+      'options.iconUrl',
+      'options.iconOpacity',
+      'options.opacity',
+      'options.weight',
+      'options.fill',
+      'options.fillColor',
+      'options.fillOpacity',
+      'options.smoothFactor',
+      'options.dashArray',
+    ]
+    const container = DomUtil.create('div')
+    const builder = new U.FormBuilder(this, options)
+    const defaultShapeProperties = L.DomUtil.add('div', '', container)
+    defaultShapeProperties.appendChild(builder.build())
+
+    this.map.editPanel.open({ content: container })
+  }
+
+  renderToolbox(container) {
+    const toggle = L.DomUtil.createButtonIcon(
+      container,
+      'icon-eye',
+      L._('Show/hide layer')
+    )
+    const edit = L.DomUtil.createButtonIcon(
+      container,
+      'icon-edit show-on-edit',
+      L._('Edit')
+    )
+    const remove = L.DomUtil.createButtonIcon(
+      container,
+      'icon-delete show-on-edit',
+      L._('Delete layer')
+    )
+    L.DomEvent.on(edit, 'click', this.edit, this)
+    L.DomEvent.on(
+      remove,
+      'click',
+      function () {
+        if (!confirm(L._('Are you sure you want to delete this rule?'))) return
+        this._delete()
+        this.map.editPanel.close()
+      },
+      this
+    )
+    DomUtil.add('span', '', container, this.condition || translate('empty rule'))
+    //L.DomEvent.on(toggle, 'click', this.toggle, this)
+  }
+
+  _delete() {
+    this.map.rules.rules = this.map.rules.rules.filter((rule) => rule != this)
+  }
+}
+
+export default class Rules {
+  constructor(map) {
+    this.map = map
+    this.rules = []
+    this.loadRules()
+  }
+
+  loadRules() {
+    if (!this.map.options.rules?.length) return
+    for (const { condition, options } of this.map.options.rules) {
+      if (!condition) continue
+      this.rules.push(new Rule(this.map, condition, options))
+    }
+  }
+
+  edit(container) {
+    const body = L.DomUtil.createFieldset(
+      container,
+      translate('Conditional style rules')
+    )
+    if (this.rules.length) {
+      const list = DomUtil.create('ul', '', body)
+      for (const rule of this.rules) {
+        rule.renderToolbox(DomUtil.create('li', '', list))
+      }
+    }
+    L.DomUtil.createButton('umap-add', body, translate('Add rule'), this.addRule, this)
+  }
+
+  addRule() {
+    const rule = new Rule(this.map)
+    rule.isDirty = true
+    this.rules.push(rule)
+    rule.edit(map)
+  }
+
+  commit() {
+    this.map.options.rules = this.rules.map((rule) => {
+      return {
+        condition: rule.condition,
+        options: rule.options,
+      }
+    })
+  }
+
+  getOption(option, feature) {
+    for (const rule of this.rules) {
+      if (rule.match(feature.properties)) {
+        if (Utils.usableOption(rule.options, option)) return rule.options[option]
+        break
+      }
+    }
+  }
+}
diff --git a/umap/static/umap/js/modules/schema.js b/umap/static/umap/js/modules/schema.js
index 07e520bb..694a4512 100644
--- a/umap/static/umap/js/modules/schema.js
+++ b/umap/static/umap/js/modules/schema.js
@@ -386,6 +386,10 @@ export const SCHEMA = {
     type: Object,
     impacts: ['remote-data'],
   },
+  rules: {
+    type: Object,
+    impacts: ['data'],
+  },
   scaleControl: {
     type: Boolean,
     impacts: ['ui'],
diff --git a/umap/static/umap/js/umap.js b/umap/static/umap/js/umap.js
index 9cc41025..13702036 100644
--- a/umap/static/umap/js/umap.js
+++ b/umap/static/umap/js/umap.js
@@ -419,6 +419,7 @@ U.Map = L.Map.extend({
     this.importer = new U.Importer(this)
     this.drop = new U.DropControl(this)
     this.share = new U.Share(this)
+    this.rules = new U.Rules(this)
     this._controls.tilelayers = new U.TileLayerControl(this)
   },
 
@@ -823,7 +824,15 @@ U.Map = L.Map.extend({
     return U.SCHEMA[option] && U.SCHEMA[option].default
   },
 
-  getOption: function (option) {
+  getRuleOption: function (option, feature) {
+    return this.rules.getOption(option, feature)
+  },
+
+  getOption: function (option, feature) {
+    if (feature) {
+      const value = this.getRuleOption(option, feature)
+      if (value !== undefined) return value
+    }
     if (U.Utils.usableOption(this.options, option)) return this.options[option]
     return this.getDefaultOption(option)
   },
@@ -1031,6 +1040,7 @@ U.Map = L.Map.extend({
   },
 
   saveSelf: async function () {
+    this.rules.commit()
     const geojson = {
       type: 'Feature',
       geometry: this.geometry(),
@@ -1561,6 +1571,7 @@ U.Map = L.Map.extend({
     this._editShapeProperties(container)
     this._editDefaultProperties(container)
     this._editInteractionsProperties(container)
+    this.rules.edit(container)
     this._editTilelayer(container)
     this._editOverlay(container)
     this._editBounds(container)
diff --git a/umap/static/umap/js/umap.layer.js b/umap/static/umap/js/umap.layer.js
index faf2d5d4..177f278a 100644
--- a/umap/static/umap/js/umap.layer.js
+++ b/umap/static/umap/js/umap.layer.js
@@ -1496,7 +1496,7 @@ U.DataLayer = L.Evented.extend({
     } else if (this.layer && this.layer.defaults && this.layer.defaults[option]) {
       return this.layer.defaults[option]
     } else {
-      return this.map.getOption(option)
+      return this.map.getOption(option, feature)
     }
   },