[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"site-config":3,"blog-categories":6,"topic:html-geolocation-api":35,"course-tree":111},{"data":4},{"google_site_verification":5,"ga4_measurement_id":5,"site_name":5,"default_og_image":5,"twitter_handle":5},null,{"data":7},[8,14,19,25,30],{"name":9,"slug":10,"description":11,"post_count":12,"subcategories":13},"CSS","css","Learn CSS with practical tutorials and examples covering layouts, Flexbox, Grid, responsive design, typography, positioning, animations, and more.",2,[],{"name":15,"slug":16,"description":17,"post_count":12,"subcategories":18},"HTML","html","Learn HTML with practical tutorials and examples for beginners. 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Explore Java syntax, variables, data types, classes, objects, methods, inheritance, exceptions, collections, and more with clear explanations and real code examples.",[],{"data":36},{"id":37,"title":38,"slug":39,"content":40,"course":41,"subcategory":43,"author":46,"reading_time_minutes":12,"cornerstone":52,"schema_type":53,"faq_json":5,"video_url":5,"canonical_url":54,"meta_title":55,"meta_description":56,"og_image":5,"toc_json":57,"code_examples":85,"quiz":5,"exercises":94,"published_at":5,"updated_at":102,"prev":103,"next":107},62,"HTML Geolocation API","html-geolocation-api","\u003Ch2 id=\"html-geolocation-api\">HTML Geolocation API\u003C\u002Fh2>\u003Cp>The Geolocation API lets a web page request the user's physical location — latitude, longitude, and accuracy — directly from the browser, using GPS on mobile devices or IP\u002FWi-Fi triangulation on desktops. It's the technology behind \"find stores near me,\" delivery-tracking apps, weather widgets, and ride-sharing platforms.\u003C\u002Fp>\u003Ch3 id=\"how-it-works\">How It Works\u003C\u002Fh3>\u003Cp>The API is exposed through \u003Ccode>navigator.geolocation\u003C\u002Fcode>, available in every modern browser. Because location data is sensitive, browsers always show a permission prompt asking the user to allow or deny access, and the API only works on secure (HTTPS) origins.\u003C\u002Fp>\u003Ch3 id=\"getting-the-current-position\">Getting the Current Position\u003C\u002Fh3>\u003Cp>\u003Ccode>navigator.geolocation.getCurrentPosition()\u003C\u002Fcode> takes a success callback, an optional error callback, and an optional options object. The success callback receives a \u003Ccode>position\u003C\u002Fcode> object containing \u003Ccode>coords.latitude\u003C\u002Fcode>, \u003Ccode>coords.longitude\u003C\u002Fcode>, and \u003Ccode>coords.accuracy\u003C\u002Fcode> (in meters).\u003C\u002Fp>\u003Ch3 id=\"watching-position-over-time\">Watching Position Over Time\u003C\u002Fh3>\u003Cp>For apps that need continuous updates (like live navigation), \u003Ccode>watchPosition()\u003C\u002Fcode> keeps calling the success callback whenever the device's location changes, and returns a watch ID that can later be passed to \u003Ccode>clearWatch()\u003C\u002Fcode> to stop tracking.\u003C\u002Fp>\u003Ch3 id=\"handling-errors-and-permissions\">Handling Errors and Permissions\u003C\u002Fh3>\u003Cp>Users can deny the permission prompt, location services can be turned off, or the device may simply fail to get a fix. The error callback receives an error object with a \u003Ccode>code\u003C\u002Fcode> (1 = permission denied, 2 = position unavailable, 3 = timeout) and a \u003Ccode>message\u003C\u002Fcode>, so always handle this gracefully instead of assuming success.\u003C\u002Fp>\u003Ch3 id=\"useful-options\">Useful Options\u003C\u002Fh3>\u003Cul>\n\u003Cli>\u003Cstrong>enableHighAccuracy\u003C\u002Fstrong> — requests GPS-level precision (uses more battery).\u003C\u002Fli>\n\u003Cli>\u003Cstrong>timeout\u003C\u002Fstrong> — how long to wait (in ms) before giving up.\u003C\u002Fli>\n\u003Cli>\u003Cstrong>maximumAge\u003C\u002Fstrong> — allows reusing a cached position up to a given age in ms.\u003C\u002Fli>\n\u003C\u002Ful>\u003Ch3 id=\"common-use-cases\">Common Use Cases\u003C\u002Fh3>\u003Cp>Store locators, weather apps, delivery ETA tracking, geo-tagged photos, ride-sharing pickup detection, and location-based content personalization all build on this API.\u003C\u002Fp>\u003Cdiv class=\"try-it-yourself language-javascript\">\u003Cpre>\u003Ccode>if ('geolocation' in navigator) {\n  navigator.geolocation.getCurrentPosition(\n    (position) => {\n      const { latitude, longitude, accuracy } = position.coords;\n      console.log(`Lat: ${latitude}, Lng: ${longitude}, Accuracy: ${accuracy}m`);\n    },\n    (error) => {\n      console.error('Geolocation error:', error.code, error.message);\n    },\n    {\n      enableHighAccuracy: true,\n      timeout: 10000,\n      maximumAge: 0\n    }\n  );\n} else {\n  console.log('Geolocation is not supported by this browser.');\n}\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>\u003Cdiv class=\"try-it-yourself language-javascript\">\u003Cpre>\u003Ccode>\u002F\u002F Continuously track the user's position and stop after 30 seconds\nconst watchId = navigator.geolocation.watchPosition(\n  (position) => {\n    console.log('Updated position:', position.coords.latitude, position.coords.longitude);\n  },\n  (error) => console.error('Watch error:', error.message)\n);\n\nsetTimeout(() => {\n  navigator.geolocation.clearWatch(watchId);\n  console.log('Stopped watching position.');\n}, 30000);\u003C\u002Fcode>\u003C\u002Fpre>\u003C\u002Fdiv>",{"name":15,"slug":42},"html-tutorial",{"name":44,"slug":45},"HTML5 Web APIs (Advanced\u002FTrending)","html5-web-apis-advancedtrending",{"slug":47,"display_name":48,"job_title":5,"short_bio":5,"expertise_tags":49,"headshot":5,"long_bio":5,"credentials":5,"twitter_url":5,"linkedin_url":5,"github_url":5,"personal_website_url":5,"other_sameas_urls":5,"topics":50,"posts":51},"badar-khalil","Badar Khalil",[],[],[],false,"Article","https:\u002F\u002Fwpfsharp.com\u002Ftopics\u002Fhtml-geolocation-api","HTML Geolocation API: Get User Location in JavaScript","Learn the HTML5 Geolocation API — getting user coordinates, handling permissions, watching position changes, and error handling with code examples.",[58],{"id":39,"text":38,"level":12,"children":59},[60,65,69,73,77,81],{"id":61,"text":62,"level":63,"children":64},"how-it-works","How It Works",3,[],{"id":66,"text":67,"level":63,"children":68},"getting-the-current-position","Getting the Current Position",[],{"id":70,"text":71,"level":63,"children":72},"watching-position-over-time","Watching Position Over Time",[],{"id":74,"text":75,"level":63,"children":76},"handling-errors-and-permissions","Handling Errors and Permissions",[],{"id":78,"text":79,"level":63,"children":80},"useful-options","Useful Options",[],{"id":82,"text":83,"level":63,"children":84},"common-use-cases","Common Use Cases",[],[86,91],{"id":87,"language":88,"code":89,"is_editable":90},136,"javascript","if ('geolocation' in navigator) {\n  navigator.geolocation.getCurrentPosition(\n    (position) => {\n      const { latitude, longitude, accuracy } = position.coords;\n      console.log(`Lat: ${latitude}, Lng: ${longitude}, Accuracy: ${accuracy}m`);\n    },\n    (error) => {\n      console.error('Geolocation error:', error.code, error.message);\n    },\n    {\n      enableHighAccuracy: true,\n      timeout: 10000,\n      maximumAge: 0\n    }\n  );\n} else {\n  console.log('Geolocation is not supported by this browser.');\n}",true,{"id":92,"language":88,"code":93,"is_editable":90},137,"\u002F\u002F Continuously track the user's position and stop after 30 seconds\nconst watchId = navigator.geolocation.watchPosition(\n  (position) => {\n    console.log('Updated position:', position.coords.latitude, position.coords.longitude);\n  },\n  (error) => console.error('Watch error:', error.message)\n);\n\nsetTimeout(() => {\n  navigator.geolocation.clearWatch(watchId);\n  console.log('Stopped watching position.');\n}, 30000);",[95],{"id":96,"title":97,"slug":98,"prompt":99,"starter_code":100,"expected_output":101,"language":88,"order_index":23},60,"Show Location or a Friendly Error","show-location-or-a-friendly-error","Write code that calls getCurrentPosition(). 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