landxml/examples/web-converter/main.js

(function() {
    const xmlTextarea = document.getElementById("xml-editor");
    const geojsonTextarea = document.getElementById("geojson-editor");
    const transformButton = document.getElementById("transform-button");
    const projectionSelect = document.getElementById("projection-select");
    const downloadLink = document.getElementById("download-link");
    const fileSelector = document.getElementById("file-selector");
    const loadFileButton = document.getElementById("load-file-button");

    const xmlEditor = CodeMirror.fromTextArea(xmlTextarea, {
        lineNumbers: true,
        mode: 'application/xml',
    });
    const geojsonEditor = CodeMirror.fromTextArea(geojsonTextarea, {
        lineNumbers: true,
        mode: 'application/json',
    });

    const map = L.map('map', {zoomSnap: 0}).setView([0, 0], 1);

    L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
        maxZoom: 50,
        maxNativeZoom: 18,
        attribution: '&copy; <a href="https://openstreetmap.org/copyright">OpenStreetMap contributors</a>'
    }).addTo(map);

    let geojsonLayer;
    let projection = "auto_detect";
    
    const lastXML = localStorage.getItem("lastXML");
    const lastProjection = localStorage.getItem("lastProjection");

    if (lastXML) xmlEditor.setValue(lastXML);
    if (lastProjection) {
        projection = lastProjection;
        projectionSelect.value = projection;
    }

    projectionSelect.addEventListener("change", () => {
        projection = projectionSelect.value;
        localStorage.setItem("lastProjection", projection);
    });

    transformButton.addEventListener("click", () => {
        const xml = xmlEditor.getValue();
        const converter = new landxml.Converter();

        try {
            localStorage.setItem("lastXML", xml);
        } catch(err) {
            console.error(err);
        }

        converter.toGeoJSON(xml, { projection })
            .then(geojson => {
                if(!geojson) return;
                console.log("Generated GeoJSON:", geojson);
                geojsonEditor.setValue(JSON.stringify(geojson, null, 2));
                updatePreview();
            })
            .catch(err => {
                console.error(err);
                alert(err.message);
            })
        ;
    });


    let downloadLinkTimeout;
    let refreshTimeout;

    geojsonEditor.on("change", () => {
        clearTimeout(downloadLinkTimeout);
        downloadLinkTimeout = setTimeout(() => {
            const geojson = geojsonEditor.getValue();
            downloadLink.setAttribute('href', 'data:application/json;charset=utf-8,' + encodeURIComponent(geojson));
            downloadLink.setAttribute('download', "geojson_"+Date.now()+".json");
        }, 1000);

        clearTimeout(refreshTimeout);
        refreshTimeout = setTimeout(updatePreview, 1000);
    });

    fileSelector.addEventListener('change', (event) => {
        const fileList = event.target.files;
        console.log(fileList);
        const reader = new FileReader();
        const onLoad = (evt) => {
            reader.removeEventListener('load', onLoad);
            xmlEditor.setValue(evt.target.result);
            fileSelector.value = null;
        };
        reader.addEventListener('load', onLoad);
        reader.readAsText(fileList[0]);
    });

    loadFileButton.addEventListener('click', () => {
        fileSelector.click();
    });

    let selectedFeature;

    function updatePreview() {
        let geojson;
        try {
            geojson = JSON.parse(geojsonEditor.getValue());
        } catch(err) {
            console.error(err);
            return;
        }
        
        if (geojsonLayer) {
            geojsonLayer.remove();
        }

        geojsonLayer = L.geoJSON(geojson, { 
            style: feature => {
                return {
                    color: feature.properties.color,
                    fillColor: feature.properties.fill,
                    fillOpacity: feature.properties['fill-opacity'],
                    weight: feature.properties['stroke-width'],
                }
            },
            onEachFeature: (f, l) => {
                l.bringToBack();
            }
        }).on('click', (e) => {
            // Check for selected
            if (selectedFeature) {
              // Reset selected to default style
              e.target.resetStyle(selectedFeature)
            }

            // Assign new selected
            selectedFeature = e.layer
            const feature = selectedFeature.feature;

            console.log('Selected feature:', feature);

            // Bring selected to front
            //selectedFeature.bringToFront()
            // Style selected
            selectedFeature.setStyle({
              'fillColor': 'blue'
            })

            selectedFeature.bindPopup(`<b>${feature.properties.name}</b><br>${feature.properties.description}`).openPopup();
        }).addTo(map);
        const bounds = geojsonLayer.getBounds();
        map.fitBounds(bounds);
    }

    

}());