diff --git a/umap/static/umap/js/modules/global.js b/umap/static/umap/js/modules/global.js
index c7fce53f1..fa6f4d933 100644
--- a/umap/static/umap/js/modules/global.js
+++ b/umap/static/umap/js/modules/global.js
@@ -1,10 +1,20 @@
 import * as L from '../../vendors/leaflet/leaflet-src.esm.js'
 import URLs from './urls.js'
 import Browser from './browser.js'
+import Importer from './importer.js'
 import { Request, ServerRequest, RequestError, HTTPError, NOKError } from './request.js'
 // Import modules and export them to the global scope.
 // For the not yet module-compatible JS out there.
 
 // Copy the leaflet module, it's expected by leaflet plugins to be writeable.
 window.L = { ...L }
-window.U = { URLs, Request, ServerRequest, RequestError, HTTPError, NOKError, Browser }
+window.U = {
+  URLs,
+  Request,
+  ServerRequest,
+  RequestError,
+  HTTPError,
+  NOKError,
+  Browser,
+  Importer,
+}
diff --git a/umap/static/umap/js/modules/importer.js b/umap/static/umap/js/modules/importer.js
new file mode 100644
index 000000000..2135ab009
--- /dev/null
+++ b/umap/static/umap/js/modules/importer.js
@@ -0,0 +1,143 @@
+export default class Importer {
+  constructor(map) {
+    this.map = map
+  }
+
+  open() {
+    if (!this.form) this._build()
+    this.map.ui.openPanel({
+      data: { html: this.form },
+      className: 'dark',
+    })
+  }
+
+  openFiles() {
+    this.open()
+    this.fileInput.showPicker()
+  }
+
+  _build() {
+    const template = document.querySelector('#umap-upload')
+    this.form = template.content.firstElementChild.cloneNode(true)
+
+    this.typeLabel = this.form.querySelector('#type-label')
+    const helpButton = this.typeLabel.querySelector('button')
+    this.map.help.button(this.typeLabel, 'importFormats', '', helpButton)
+
+    this.layerSelect = this.form.querySelector('[name="datalayer"]')
+    this._buildDatalayerOptions(this.layerSelect)
+    this.presetSelect = this.form.querySelector('[name="preset-select"]')
+    this._buildPresetsOptions(this.presetSelect)
+
+    this.fileInput = this.form.querySelector('[name="file-input"]')
+    this.formatSelect = this.form.querySelector('[name="format"]')
+
+    this._connectedCallback()
+  }
+
+  _buildDatalayerOptions(layerSelect) {
+    const options = []
+    this.map.eachDataLayerReverse((datalayer) => {
+      if (datalayer.isLoaded() && !datalayer.isRemoteLayer()) {
+        options.push(
+          `<option value="${L.stamp(datalayer)}">${datalayer.options.name}</option>`
+        )
+      }
+    })
+    options.push(`<option value="">${L._('Import in a new layer')}</option>`)
+    layerSelect.innerHTML = options.join('')
+  }
+
+  _buildPresetsOptions(presetSelect) {
+    const presets = this.map.options.importPresets
+    if (!presets.length) return
+    const options = []
+    presetSelect.parentElement.removeAttribute('hidden')
+    options.push(
+      `<option value="${L._('Choose a preset')}">${L._('Choose a preset')}</option>`
+    )
+    for (const preset of presets) {
+      options.push(`<option value="${preset.url}">${preset.label}</option>`)
+    }
+    presetSelect.innerHTML = options.join('')
+  }
+
+  _connectedCallback() {
+    const controller = new AbortController()
+    const signal = controller.signal
+    this.form
+      .querySelector('[name="submit-input"]')
+      .addEventListener('click', this._submit.bind(this), { signal })
+
+    this.fileInput.addEventListener(
+      'change',
+      (e) => {
+        let type = ''
+        let newType
+        for (const file of e.target.files) {
+          newType = L.Util.detectFileType(file)
+          if (!type && newType) {
+            type = newType
+          }
+          if (type && newType !== type) {
+            type = ''
+            break
+          }
+        }
+        this.formatSelect.value = type
+      },
+      { signal }
+    )
+
+    this.map.ui.once(
+      'panel:closed',
+      () => {
+        this.fileInput.value = null
+        controller.abort()
+      },
+      { signal }
+    )
+  }
+
+  _submit() {
+    const urlInputValue = this.form.querySelector('[name="url-input"]').value
+    const rawInputValue = this.form.querySelector('[name="raw-input"]').value
+    const clearFlag = this.form.querySelector('[name="clear"]')
+    const type = this.formatSelect.value
+    const layerId = this.layerSelect[this.layerSelect.selectedIndex].value
+    let layer
+    if (type === 'umap') {
+      this.map.once('postsync', this.map._setDefaultCenter)
+    }
+    if (layerId) layer = this.map.datalayers[layerId]
+    if (layer && clearFlag.checked) layer.empty()
+    if (this.fileInput.files.length) {
+      for (const file of this.fileInput.files) {
+        this.map.processFileToImport(file, layer, type)
+      }
+    } else {
+      if (!type)
+        return this.map.ui.alert({
+          content: L._('Please choose a format'),
+          level: 'error',
+        })
+      if (rawInputValue && type === 'umap') {
+        try {
+          this.map.importRaw(rawInputValue, type)
+        } catch (e) {
+          this.ui.alert({ content: L._('Invalid umap data'), level: 'error' })
+          console.error(e)
+        }
+      } else {
+        if (!layer) layer = this.map.createDataLayer()
+        if (rawInputValue) layer.importRaw(rawInputValue, type)
+        else if (urlInputValue) layer.importFromUrl(urlInputValue, type)
+        else if (this.presetSelect.selectedIndex > 0)
+          layer.importFromUrl(
+            this.presetSelect[this.presetSelect.selectedIndex].value,
+            type
+          )
+      }
+    }
+  }
+}
diff --git a/umap/static/umap/js/umap.core.js b/umap/static/umap/js/umap.core.js
index 1dcda4b2f..2edba8637 100644
--- a/umap/static/umap/js/umap.core.js
+++ b/umap/static/umap/js/umap.core.js
@@ -598,12 +598,10 @@ U.Help = L.Class.extend({
     return typeof this[name] === 'function' ? this[name]() : this[name]
   },
 
-  button: function (container, entries, classname) {
-    const helpButton = L.DomUtil.createButton(
-      classname || 'umap-help-button',
-      container,
-      L._('Help')
-    )
+  button: function (container, entries, classname, button) {
+    const helpButton =
+      button ||
+      L.DomUtil.createButton(classname || 'umap-help-button', container, L._('Help'))
     if (entries) {
       L.DomEvent.on(helpButton, 'click', L.DomEvent.stop).on(
         helpButton,
diff --git a/umap/static/umap/js/umap.importer.js b/umap/static/umap/js/umap.importer.js
deleted file mode 100644
index 461932000..000000000
--- a/umap/static/umap/js/umap.importer.js
+++ /dev/null
@@ -1,167 +0,0 @@
-U.Importer = L.Class.extend({
-  TYPES: ['geojson', 'csv', 'gpx', 'kml', 'osm', 'georss', 'umap'],
-  initialize: function (map) {
-    this.map = map
-    this.presets = map.options.importPresets
-  },
-
-  build: function () {
-    this.container = L.DomUtil.create('div', 'umap-upload')
-    this.title = L.DomUtil.add('h3', '', this.container, L._('Import data'))
-    this.presetBox = L.DomUtil.create('div', 'formbox', this.container)
-    this.presetSelect = L.DomUtil.create('select', '', this.presetBox)
-    this.fileBox = L.DomUtil.create('div', 'formbox', this.container)
-    this.fileInput = L.DomUtil.element(
-      'input',
-      { type: 'file', multiple: 'multiple', autofocus: true },
-      this.fileBox
-    )
-    this.map.ui.once('panel:closed', () => (this.fileInput.value = null))
-    this.urlInput = L.DomUtil.element(
-      'input',
-      { type: 'text', placeholder: L._('Provide an URL here') },
-      this.container
-    )
-    this.rawInput = L.DomUtil.element(
-      'textarea',
-      { placeholder: L._('Paste your data here') },
-      this.container
-    )
-    this.typeLabel = L.DomUtil.add(
-      'label',
-      '',
-      this.container,
-      L._('Choose the format of the data to import')
-    )
-    this.layerLabel = L.DomUtil.add(
-      'label',
-      '',
-      this.container,
-      L._('Choose the layer to import in')
-    )
-    this.clearLabel = L.DomUtil.add(
-      'label',
-      '',
-      this.container,
-      L._('Replace layer content')
-    )
-    this.submitInput = L.DomUtil.element(
-      'input',
-      { type: 'button', value: L._('Import'), className: 'button' },
-      this.container
-    )
-    this.map.help.button(this.typeLabel, 'importFormats')
-    this.typeInput = L.DomUtil.element('select', { name: 'format' }, this.typeLabel)
-    this.layerInput = L.DomUtil.element(
-      'select',
-      { name: 'datalayer' },
-      this.layerLabel
-    )
-    this.clearFlag = L.DomUtil.element(
-      'input',
-      { type: 'checkbox', name: 'clear' },
-      this.clearLabel
-    )
-    let option
-    this.map.eachDataLayerReverse((datalayer) => {
-      if (datalayer.isLoaded() && !datalayer.isRemoteLayer()) {
-        const id = L.stamp(datalayer)
-        option = L.DomUtil.add('option', '', this.layerInput, datalayer.options.name)
-        option.value = id
-      }
-    })
-    L.DomUtil.element(
-      'option',
-      { value: '', textContent: L._('Import in a new layer') },
-      this.layerInput
-    )
-    L.DomUtil.element(
-      'option',
-      { value: '', textContent: L._('Choose the data format') },
-      this.typeInput
-    )
-    for (let i = 0; i < this.TYPES.length; i++) {
-      option = L.DomUtil.create('option', '', this.typeInput)
-      option.value = option.textContent = this.TYPES[i]
-    }
-    if (this.presets.length) {
-      const noPreset = L.DomUtil.create('option', '', this.presetSelect)
-      noPreset.value = noPreset.textContent = L._('Choose a preset')
-      for (let j = 0; j < this.presets.length; j++) {
-        option = L.DomUtil.create('option', '', presetSelect)
-        option.value = this.presets[j].url
-        option.textContent = this.presets[j].label
-      }
-    } else {
-      this.presetBox.style.display = 'none'
-    }
-    L.DomEvent.on(this.submitInput, 'click', this.submit, this)
-    L.DomEvent.on(
-      this.fileInput,
-      'change',
-      (e) => {
-        let type = '',
-          newType
-        for (let i = 0; i < e.target.files.length; i++) {
-          newType = L.Util.detectFileType(e.target.files[i])
-          if (!type && newType) type = newType
-          if (type && newType !== type) {
-            type = ''
-            break
-          }
-        }
-        this.typeInput.value = type
-      },
-      this
-    )
-  },
-
-  open: function () {
-    if (!this.container) this.build()
-    this.map.ui.openPanel({ data: { html: this.container }, className: 'dark' })
-  },
-
-  openFiles: function () {
-    this.open()
-    this.fileInput.showPicker()
-  },
-
-  submit: function () {
-    let type = this.typeInput.value
-    const layerId = this.layerInput[this.layerInput.selectedIndex].value
-    let layer
-    if (type === 'umap') {
-      this.map.once('postsync', this.map._setDefaultCenter)
-    }
-    if (layerId) layer = this.map.datalayers[layerId]
-    if (layer && this.clearFlag.checked) layer.empty()
-    if (this.fileInput.files.length) {
-      for (let i = 0, file; (file = this.fileInput.files[i]); i++) {
-        this.map.processFileToImport(file, layer, type)
-      }
-    } else {
-      if (!type)
-        return this.map.ui.alert({
-          content: L._('Please choose a format'),
-          level: 'error',
-        })
-      if (this.rawInput.value && type === 'umap') {
-        try {
-          this.map.importRaw(this.rawInput.value, type)
-        } catch (e) {
-          this.ui.alert({ content: L._('Invalid umap data'), level: 'error' })
-          console.error(e)
-        }
-      } else {
-        if (!layer) layer = this.map.createDataLayer()
-        if (this.rawInput.value) layer.importRaw(this.rawInput.value, type)
-        else if (this.urlInput.value) layer.importFromUrl(this.urlInput.value, type)
-        else if (this.presetSelect.selectedIndex > 0)
-          layer.importFromUrl(
-            this.presetSelect[this.presetSelect.selectedIndex].value,
-            type
-          )
-      }
-    }
-  },
-})
diff --git a/umap/static/umap/test/index.html b/umap/static/umap/test/index.html
index 23c9d52fd..068a9ce55 100644
--- a/umap/static/umap/test/index.html
+++ b/umap/static/umap/test/index.html
@@ -44,7 +44,6 @@
     <script src="../js/umap.controls.js" defer></script>
     <script src="../js/umap.slideshow.js" defer></script>
     <script src="../js/umap.tableeditor.js" defer></script>
-    <script src="../js/umap.importer.js" defer></script>
     <script src="../js/umap.share.js" defer></script>
     <script src="../js/umap.js" defer></script>
     <script src="../js/umap.ui.js" defer></script>
diff --git a/umap/templates/umap/js.html b/umap/templates/umap/js.html
index ca839ae1d..2f1221929 100644
--- a/umap/templates/umap/js.html
+++ b/umap/templates/umap/js.html
@@ -45,7 +45,6 @@
 <script src="{% static 'umap/js/umap.controls.js' %}" defer></script>
 <script src="{% static 'umap/js/umap.slideshow.js' %}" defer></script>
 <script src="{% static 'umap/js/umap.tableeditor.js' %}" defer></script>
-<script src="{% static 'umap/js/umap.importer.js' %}" defer></script>
 <script src="{% static 'umap/js/umap.share.js' %}" defer></script>
 <script src="{% static 'umap/js/umap.js' %}" defer></script>
 <script src="{% static 'umap/js/umap.ui.js' %}" defer></script>
diff --git a/umap/templates/umap/map_init.html b/umap/templates/umap/map_init.html
index 91713b35d..398022e4a 100644
--- a/umap/templates/umap/map_init.html
+++ b/umap/templates/umap/map_init.html
@@ -1,5 +1,45 @@
-{% load umap_tags %}
+{% load i18n umap_tags %}
 <div id="map"></div>
+
+<template id="umap-upload">
+  <form class="umap-upload">
+    <h4>{% blocktrans %}Import data{% endblocktrans %}</h4>
+    <div id="preset-box" class="formbox" hidden>
+      <select name="preset-select"></select>
+    </div>
+    <div class="formbox">
+      <input type="file" name="file-input" multiple>
+    </div>
+    <input type="url" name="url-input" placeholder="{% blocktrans %}Provide an URL here{% endblocktrans %}">
+    <textarea name="raw-input" placeholder="{% blocktrans %}Paste your data here{% endblocktrans %}"></textarea>
+
+    <label id="type-label">
+      {% blocktrans %}Choose the format of the data to import{% endblocktrans %}
+      <button class="umap-help-button" type="button">{% blocktrans %}Help{% endblocktrans %}</button>
+      <select name="format">
+        <option value disabled selected>
+          {% blocktrans %}Choose the data format{% endblocktrans %}
+        </option>
+        <option value="geojson">geojson</option>
+        <option value="csv">csv</option>
+        <option value="gpx">gpx</option>
+        <option value="kml">kml</option>
+        <option value="osm">osm</option>
+        <option value="georss">georss</option>
+        <option value="umap">umap</option>
+      </select>
+    </label>
+    <label id="layer-label">
+      {% blocktrans %}Choose the layer to import in{% endblocktrans %}
+      <select name="datalayer"></select>
+    </label>
+    <label>
+      {% blocktrans %}Replace layer content{% endblocktrans %}
+      <input type="checkbox" name="clear">
+    </label>
+    <input type="button" class="button" name="submit-input" value="{% blocktrans %}Import{% endblocktrans %}">
+  </form>
+</template>
 <!-- djlint:off -->
 <script defer type="text/javascript">
   let MAP