ویژگیهای دادهای را طوری تنظیم کنید که به رویدادهای mousemove و click واکنش نشان دهند و از آنها برای تغییر ظاهر یک ویژگی بر اساس تعامل کاربر استفاده کنید.
فعال کردن رویدادهای لایه مجموعه داده
برای فعال کردن رویدادها در یک لایه مجموعه داده، مراحل زیر را دنبال کنید:
با فراخوانی تابع
addListener()در لایه مجموعه داده برای هر رویدادی که میخواهید ثبت کنید، یک لایه مجموعه داده برای اعلانهای رویداد ثبت کنید. در این مثال، نقشه همچنین یک شنونده (listener) دریافت میکند.تایپ اسکریپت
datasetLayer = map.getDatasetFeatureLayer(datasetId); datasetLayer.style = applyStyle; datasetLayer.addListener('click', handleClick); datasetLayer.addListener('mousemove', handleMouseMove); // Map event listener. map.addListener('mousemove', () => { // If the map gets a mousemove, that means there are no feature layers // with listeners registered under the mouse, so we clear the last // interacted feature ids. if (lastInteractedFeatureIds?.length) { lastInteractedFeatureIds = []; datasetLayer.style = applyStyle; } });
جاوا اسکریپت
datasetLayer = map.getDatasetFeatureLayer(datasetId); datasetLayer.style = applyStyle; datasetLayer.addListener("click", handleClick); datasetLayer.addListener("mousemove", handleMouseMove); // Map event listener. map.addListener("mousemove", () => { // If the map gets a mousemove, that means there are no feature layers // with listeners registered under the mouse, so we clear the last // interacted feature ids. if (lastInteractedFeatureIds?.length) { lastInteractedFeatureIds = []; datasetLayer.style = applyStyle; } });
کد مدیریت رویداد را برای استایلدهی به ویژگی انتخابشده بر اساس نوع تعامل اضافه کنید.
تایپ اسکریپت
// Note, 'globalid' is an attribute in this Dataset. function handleClick(/* MouseEvent */ e) { if (e.features) { lastClickedFeatureIds = e.features.map((f) => f.datasetAttributes['globalid']); } //@ts-ignore datasetLayer.style = applyStyle; } function handleMouseMove(/* MouseEvent */ e) { if (e.features) { lastInteractedFeatureIds = e.features.map((f) => f.datasetAttributes['globalid']); } //@ts-ignore datasetLayer.style = applyStyle; }
جاوا اسکریپت
// Note, 'globalid' is an attribute in this Dataset. function handleClick(/* MouseEvent */ e) { if (e.features) { lastClickedFeatureIds = e.features.map( (f) => f.datasetAttributes["globalid"], ); } //@ts-ignore datasetLayer.style = applyStyle; } function handleMouseMove(/* MouseEvent */ e) { if (e.features) { lastInteractedFeatureIds = e.features.map( (f) => f.datasetAttributes["globalid"], ); } //@ts-ignore datasetLayer.style = applyStyle; }
از یک تابع سبک ویژگی برای اعمال سبکها استفاده کنید. تابع سبک ویژگی نشان داده شده در اینجا، سبک را به صورت شرطی بر اساس نوع تعامل اعمال میکند. سه سبک در اینجا تعریف شده است: یکی برای پررنگ کردن حاشیه با
mousemove، یکی برای تغییر پسزمینه باclickو یک سبک پیشفرض.تایپ اسکریپت
const styleDefault = { strokeColor: 'green', strokeWeight: 2.0, strokeOpacity: 1.0, fillColor: 'green', fillOpacity: 0.3, }; const styleClicked = { ...styleDefault, strokeColor: 'blue', fillColor: 'blue', fillOpacity: 0.5, }; const styleMouseMove = { ...styleDefault, strokeWeight: 4.0 }; function applyStyle(/* FeatureStyleFunctionOptions */ params) { const datasetFeature = params.feature; // Note, 'globalid' is an attribute in this dataset. //@ts-ignore if (lastClickedFeatureIds.includes(datasetFeature.datasetAttributes['globalid'])) { return styleClicked; } //@ts-ignore if (lastInteractedFeatureIds.includes(datasetFeature.datasetAttributes['globalid'])) { return styleMouseMove; } return styleDefault; }
جاوا اسکریپت
const styleDefault = { strokeColor: "green", strokeWeight: 2.0, strokeOpacity: 1.0, fillColor: "green", fillOpacity: 0.3, }; const styleClicked = { ...styleDefault, strokeColor: "blue", fillColor: "blue", fillOpacity: 0.5, }; const styleMouseMove = { ...styleDefault, strokeWeight: 4.0, }; function applyStyle(/* FeatureStyleFunctionOptions */ params) { const datasetFeature = params.feature; // Note, 'globalid' is an attribute in this dataset. //@ts-ignore if ( lastClickedFeatureIds.includes(datasetFeature.datasetAttributes["globalid"]) ) { return styleClicked; } //@ts-ignore if ( lastInteractedFeatureIds.includes( datasetFeature.datasetAttributes["globalid"], ) ) { return styleMouseMove; } return styleDefault; }
کد مثال کامل
تایپ اسکریپت
let map: google.maps.Map; let lastInteractedFeatureIds = []; let lastClickedFeatureIds = []; let datasetLayer; // Note, 'globalid' is an attribute in this Dataset. function handleClick(/* MouseEvent */ e) { if (e.features) { lastClickedFeatureIds = e.features.map((f) => f.datasetAttributes['globalid']); } //@ts-ignore datasetLayer.style = applyStyle; } function handleMouseMove(/* MouseEvent */ e) { if (e.features) { lastInteractedFeatureIds = e.features.map((f) => f.datasetAttributes['globalid']); } //@ts-ignore datasetLayer.style = applyStyle; } async function initMap() { // Request needed libraries. const { Map } = await google.maps.importLibrary('maps') as google.maps.MapsLibrary; const position = {lat: 40.780101, lng: -73.967780}; map = new Map(document.getElementById('map') as HTMLElement, { zoom: 13, center: position, mapId: 'b98e588c46685dd7', mapTypeControl: false, }); // Dataset ID for NYC park data. const datasetId = '6fe13aa9-b900-45e7-b636-3236672c3f4f'; //@ts-ignore datasetLayer = map.getDatasetFeatureLayer(datasetId); datasetLayer.style = applyStyle; datasetLayer.addListener('click', handleClick); datasetLayer.addListener('mousemove', handleMouseMove); // Map event listener. map.addListener('mousemove', () => { // If the map gets a mousemove, that means there are no feature layers // with listeners registered under the mouse, so we clear the last // interacted feature ids. if (lastInteractedFeatureIds?.length) { lastInteractedFeatureIds = []; datasetLayer.style = applyStyle; } }); const attributionDiv = document.createElement('div'); const attributionControl = createAttribution(map); attributionDiv.appendChild(attributionControl); map.controls[google.maps.ControlPosition.LEFT_BOTTOM].push(attributionDiv); } const styleDefault = { strokeColor: 'green', strokeWeight: 2.0, strokeOpacity: 1.0, fillColor: 'green', fillOpacity: 0.3, }; const styleClicked = { ...styleDefault, strokeColor: 'blue', fillColor: 'blue', fillOpacity: 0.5, }; const styleMouseMove = { ...styleDefault, strokeWeight: 4.0 }; function applyStyle(/* FeatureStyleFunctionOptions */ params) { const datasetFeature = params.feature; // Note, 'globalid' is an attribute in this dataset. //@ts-ignore if (lastClickedFeatureIds.includes(datasetFeature.datasetAttributes['globalid'])) { return styleClicked; } //@ts-ignore if (lastInteractedFeatureIds.includes(datasetFeature.datasetAttributes['globalid'])) { return styleMouseMove; } return styleDefault; } function createAttribution(map) { const attributionLabel = document.createElement('div'); // Define CSS styles. attributionLabel.style.backgroundColor = '#fff'; attributionLabel.style.opacity = '0.7'; attributionLabel.style.fontFamily = 'Roboto,Arial,sans-serif'; attributionLabel.style.fontSize = '10px'; attributionLabel.style.padding = '2px'; attributionLabel.style.margin = '2px'; attributionLabel.textContent = 'Data source: NYC Open Data'; return attributionLabel; } initMap();
جاوا اسکریپت
let map; let lastInteractedFeatureIds = []; let lastClickedFeatureIds = []; let datasetLayer; // Note, 'globalid' is an attribute in this Dataset. function handleClick(/* MouseEvent */ e) { if (e.features) { lastClickedFeatureIds = e.features.map( (f) => f.datasetAttributes["globalid"], ); } //@ts-ignore datasetLayer.style = applyStyle; } function handleMouseMove(/* MouseEvent */ e) { if (e.features) { lastInteractedFeatureIds = e.features.map( (f) => f.datasetAttributes["globalid"], ); } //@ts-ignore datasetLayer.style = applyStyle; } async function initMap() { // Request needed libraries. const { Map } = await google.maps.importLibrary("maps"); const position = { lat: 40.780101, lng: -73.96778 }; map = new Map(document.getElementById("map"), { zoom: 13, center: position, mapId: "b98e588c46685dd7", mapTypeControl: false, }); // Dataset ID for NYC park data. const datasetId = "6fe13aa9-b900-45e7-b636-3236672c3f4f"; //@ts-ignore datasetLayer = map.getDatasetFeatureLayer(datasetId); datasetLayer.style = applyStyle; datasetLayer.addListener("click", handleClick); datasetLayer.addListener("mousemove", handleMouseMove); // Map event listener. map.addListener("mousemove", () => { // If the map gets a mousemove, that means there are no feature layers // with listeners registered under the mouse, so we clear the last // interacted feature ids. if (lastInteractedFeatureIds?.length) { lastInteractedFeatureIds = []; datasetLayer.style = applyStyle; } }); const attributionDiv = document.createElement("div"); const attributionControl = createAttribution(map); attributionDiv.appendChild(attributionControl); map.controls[google.maps.ControlPosition.LEFT_BOTTOM].push(attributionDiv); } const styleDefault = { strokeColor: "green", strokeWeight: 2.0, strokeOpacity: 1.0, fillColor: "green", fillOpacity: 0.3, }; const styleClicked = { ...styleDefault, strokeColor: "blue", fillColor: "blue", fillOpacity: 0.5, }; const styleMouseMove = { ...styleDefault, strokeWeight: 4.0, }; function applyStyle(/* FeatureStyleFunctionOptions */ params) { const datasetFeature = params.feature; // Note, 'globalid' is an attribute in this dataset. //@ts-ignore if ( lastClickedFeatureIds.includes(datasetFeature.datasetAttributes["globalid"]) ) { return styleClicked; } //@ts-ignore if ( lastInteractedFeatureIds.includes( datasetFeature.datasetAttributes["globalid"], ) ) { return styleMouseMove; } return styleDefault; } function createAttribution(map) { const attributionLabel = document.createElement("div"); // Define CSS styles. attributionLabel.style.backgroundColor = "#fff"; attributionLabel.style.opacity = "0.7"; attributionLabel.style.fontFamily = "Roboto,Arial,sans-serif"; attributionLabel.style.fontSize = "10px"; attributionLabel.style.padding = "2px"; attributionLabel.style.margin = "2px"; attributionLabel.textContent = "Data source: NYC Open Data"; return attributionLabel; } initMap();