add coordinate_input plugin

folium/plugins/__init__.py

@@ -3,6 +3,7 @@
 from folium.plugins.antpath import AntPath
 from folium.plugins.beautify_icon import BeautifyIcon
 from folium.plugins.boat_marker import BoatMarker
+from folium.plugins.coordinate_input import CoordinateInput
 from folium.plugins.draw import Draw
 from folium.plugins.dual_map import DualMap
 from folium.plugins.encoded import PolygonFromEncoded, PolyLineFromEncoded
@@ -49,6 +50,7 @@
     "BeautifyIcon",
     "BoatMarker",
     "CirclePattern",
+    "CoordinateInput",
     "Draw",
     "DualMap",
     "FastMarkerCluster",

folium/plugins/coordinate_input.py

@@ -0,0 +1,166 @@
+from branca.element import MacroElement
+from folium.template import Template
+
+
+class CoordinateInput(MacroElement):
+    """
+    Add input form to the map for entering coordinates and placing markers at those locations.
+    Supports marker removal by double-clicking.
+
+    Parameters
+    ----------
+    position : str, default 'topleft'
+        Corner of the map where the input form will be placed.
+        Options: 'topleft', 'topright', 'bottomleft', 'bottomright'
+    placeholder : str, default 'Latitude, Longitude'
+        Placeholder text for the coordinate input field (e.g., "40.7128, -74.0060")
+    button_text : str, default 'Add Marker'
+        Text displayed on the submit button
+    popup_text : str, default None
+        Text to display in marker popups. Use ${lat} and ${lng} for coordinates.
+        If None, will show 'Lat: {lat}, Lon: {lng}'
+    show_instructions : bool, default True
+        Whether to show instructions for removing markers
+
+    Examples
+    --------
+    >>> m = folium.Map([45.5, -122.3], zoom_start=13)
+    >>> CoordinateInput().add_to(m)
+    >>> m.save('map.html')
+
+    >>> # With custom settings
+    >>> CoordinateInput(
+    ...     position='topright',
+    ...     placeholder='Enter coordinates',
+    ...     button_text='Place Marker',
+    ...     popup_text='<b>Coordinates:</b><br>Lat: ${lat}<br>Lon: ${lng}'
+    ... ).add_to(m)
+
+    To remove a marker, double-click on it.
+    """
+
+    _template = Template(
+        r"""
+        {% macro script(this, kwargs) %}
+            (function() {
+                var {{ this.get_name() }}_control = L.control({position: '{{ this.position }}'});
+
+                {{ this.get_name() }}_control.onAdd = function (map) {
+                    var div = L.DomUtil.create('div', 'leaflet-control leaflet-bar');
+                    div.id = '{{ this.get_name() }}_container';
+                    div.style.backgroundColor = 'white';
+                    div.style.padding = '10px';
+                    div.style.borderRadius = '5px';
+                    div.style.boxShadow = '0 2px 4px rgba(0,0,0,0.1)';
+
+                    var instructionsHtml = '{% if this.show_instructions %}<div style="margin-bottom: 8px; font-size: 10px; color: #666; max-width: 150px;"><em>Double-click marker to remove</em></div>{% endif %}';
+
+                    div.innerHTML = '<div style="font-family: Arial, sans-serif; font-size: 12px; width: 150px;">' +
+                        '<div style="margin-bottom: 8px; font-weight: bold;">Add Marker</div>' +
+                        instructionsHtml +
+                        '<input type="text" id="{{ this.get_name() }}_coords" placeholder="{{ this.placeholder }}" style="width: 100%; padding: 5px; margin-bottom: 5px; box-sizing: border-box;">' +
+                        '<button id="{{ this.get_name() }}_btn" style="width: 100%; background-color: #4CAF50; color: white; border: none; border-radius: 3px; cursor: pointer; font-size: 12px;">{{ this.button_text }}</button>' +
+                        '<button id="{{ this.get_name() }}_clear_btn" style="width: 100%; margin-top: 5px; background-color: #f44336; color: white; border: none; border-radius: 3px; cursor: pointer; font-size: 12px;">Clear All</button>' +
+                        '</div>';
+
+                    L.DomEvent.disableClickPropagation(div);
+
+                    return div;
+                };
+
+                {{ this.get_name() }}_control.addTo({{ this._parent.get_name() }});
+
+                setTimeout(function() {
+                    var btnElement = document.getElementById('{{ this.get_name() }}_btn');
+                    var clearBtnElement = document.getElementById('{{ this.get_name() }}_clear_btn');
+                    var coordsElement = document.getElementById('{{ this.get_name() }}_coords');
+                    var map = {{ this._parent.get_name() }};
+                    var markerGroup = L.featureGroup();
+                    markerGroup.addTo(map);
+
+                    if (btnElement && coordsElement) {
+                        var addMarker = function() {
+                            var input = coordsElement.value.trim();
+                            var parts = input.split(',');
+
+                            if (parts.length !== 2) {
+                                alert('Please enter coordinates in format: latitude, longitude');
+                                return;
+                            }
+
+                            var lat = parseFloat(parts[0].trim());
+                            var lng = parseFloat(parts[1].trim());
+
+                            if (isNaN(lat) || isNaN(lng)) {
+                                alert('Please enter valid numbers for coordinates');
+                                return;
+                            }
+
+                            if (lat < -90 || lat > 90) {
+                                alert('Latitude must be between -90 and 90');
+                                return;
+                            }
+
+                            if (lng < -180 || lng > 180) {
+                                alert('Longitude must be between -180 and 180');
+                                return;
+                            }
+
+                            var marker = L.marker([lat, lng]);
+
+                            var popupText = '{{ this.popup_text }}';
+                            if (popupText === '') {
+                                popupText = 'Lat: ' + lat.toFixed(4) + '<br>Lon: ' + lng.toFixed(4);
+                            } else {
+                                popupText = popupText.replace(/\$\{lat\}/g, lat.toFixed(4));
+                                popupText = popupText.replace(/\$\{lng\}/g, lng.toFixed(4));
+                            }
+                            marker.bindPopup(popupText);
+
+                            // Add double-click to remove marker
+                            marker.on('dblclick', function() {
+                                markerGroup.removeLayer(marker);
+                            });
+
+                            markerGroup.addLayer(marker);
+                            coordsElement.value = '';
+                            marker.openPopup();
+                        };
+
+                        btnElement.addEventListener('click', addMarker);
+
+                        coordsElement.addEventListener('keypress', function(e) {
+                            if (e.key === 'Enter') {
+                                addMarker();
+                            }
+                        });
+
+                        clearBtnElement.addEventListener('click', function() {
+                            if (confirm('Are you sure you want to remove all markers?')) {
+                                markerGroup.clearLayers();
+                                coordsElement.value = '';
+                            }
+                        });
+                    }
+                }, 100);
+            })();
+        {% endmacro %}
+        """
+    )
+
+    def __init__(
+        self,
+        position: str = "topleft",
+        placeholder: str = "Latitude, Longitude",
+        button_text: str = "Add Marker",
+        popup_text: str = "",
+        show_instructions: bool = True,
+    ):
+        super().__init__()
+        self._name = "CoordinateInput"
+
+        self.position = position
+        self.placeholder = placeholder
+        self.button_text = button_text
+        self.popup_text = popup_text if popup_text else "Lat: ${lat}<br>Lon: ${lng}"
+        self.show_instructions = show_instructions