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Creating Interfaces

Creating Interfaces. Show form validation examples, Hangman. HTML5 with Google Maps API. Add in localStorage. Design pitfalls. Homework: Make proposal for your project. Bring earphones to next class. Show homework. form examples Hangman. Maps app.

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Creating Interfaces

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  1. Creating Interfaces Show form validation examples, Hangman. HTML5 with Google Maps API. Add in localStorage. Design pitfalls. Homework: Make proposal for your project. Bring earphones to next class.

  2. Show homework • form examples • Hangman

  3. Maps app • Use Google Maps API to bring up map at actual current location. • geolocation • Respond to clicking by placing a marker and calculating distance. • Provide way to change to fixed set of locations or the last marker. • http://faculty.purchase.edu/jeanine.meyer/html5workshop/geolocationdistance2.html • need to give permission to Share Location

  4. Opening screen

  5. Brings up ….

  6. After click on map

  7. After choose CUNY

  8. Mapping • Google Maps API (and other applications) defines positions using special latitude/longitude data object • Access to Google Map is created for a place in the HTML document, using specified map options • HTML has a specification for doing geolocation. • navigator.geolocation produces latitude and longitude values

  9. How to get positions? • Google Maps • get to a map • Browser location javascript:void(prompt('',gApplication.getMap().getCenter())); OR • Click on green beaker and enable the drop latlng marker • right click then normal click

  10. Basics • if (navigator.geolocation) checks if this object exists. Does NOT cause any errors. • map = new google.maps.Map(document.getElementById("place"), myOptions); brings up Google Maps in the div with id "place" using the parameters in myOptions.

  11. style, external script <style> header {font-family:Georgia,"Times New Roman",serif; font-size:20px; display:block; } </style> <script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script> <script language="Javascript">

  12. standalone code if (navigator.geolocation) { navigator.geolocation.getCurrentPosition(function(position) {doStuff(position.coords.latitude, position.coords.longitude); }); } else { if (document.getElementById("place")) { document.getElementById("place").innerHTML = "I'm sorry but geolocation services are not supported by your browser"; document.getElementById("place").style.color = "#FF0000"; } }

  13. variables var listener; var map; var markersArray =[]; var blatlng; var myOptions; var locations = [ [40.82276,-73.94806, "CUNY"], [41.04796,-73.70539,"Purchase College/SUNY"], [41.878928, -87.641926,"IIT"] ];

  14. create/access map function doStuff(mylat, mylong) { blatlng = new google.maps.LatLng(mylat,mylong); myOptions = { zoom: 14, center: blatlng, mapTypeId: google.maps.MapTypeId.ROADMAP }; map = new google.maps.Map(document.getElementById("place"), myOptions); listener = google.maps.event.addListener(map, 'click', function(event) { checkit(event.latLng);}); }

  15. response to click on map function checkit(clatlng) { var distance = dist(clatlng,blatlng); distance = Math.floor((distance+.005)*100)/100; var distanceString = String(distance)+" miles"; marker = new google.maps.Marker({ position: clatlng, title: distanceString, map: map }); markersArray.push(marker); document.getElementById("answer").innerHTML = "The distance from base to most recent marker is "+String(distance) +" miles."; }

  16. distance function function dist(point1, point2) { //spherical law of cosines //var R = 6371; // km var R = 3959; // miles var lat1 = point1.lat()*Math.PI/180; var lat2 = point2.lat()*Math.PI/180 ; var lon1 = point1.lng()*Math.PI/180; var lon2 = point2.lng()*Math.PI/180; var d = Math.acos(Math.sin(lat1)*Math.sin(lat2) + Math.cos(lat1)*Math.cos(lat2) * Math.cos(lon2-lon1)) * R; return d; }

  17. change base using radio buttons function changebase() { for(var i=0;i<locations.length;i++) { if (document.f.loc[i].checked) { doStuff(locations[i][0],locations[i][1]); document.getElementById("header").innerHTML = "Base location is "+locations[i][2]; } } return false; }

  18. </script> </head> <body> <header id="header">Base location is your current geolocation</header> <div id="place" style="width:70%; height:70%"></div> <div id="answer"></div> Change base location: <br/> <form name="f" onSubmit=" return changebase();"> <input type="radio" name="loc" /> CUNY<br/> <input type="radio" name="loc" /> Purchase College<br/> <input type="radio" name="loc" /> Illinois Institute of Technology<br/> <input type="submit" value="CHANGE"> </form> </body> </html>

  19. Add persistent storage • Use localStorage to save and recall the base location. • REMEMBER: Firefox requires the program to run on a server! Chrome allows running locally. • http://faculty.purchase.edu/jeanine.meyer/html5workshop/geolocationdistance4.html

  20. Opening (after permission)

  21. New base

  22. Objective: add to maps app • 3 buttons: store base, retrieve base stored, change base to last marker • localStorage used name-value pairs. • Do error checking! • check for ability to do localStorage • check if there is a stored time.

  23. Strategy • Three buttons, invoking store(), retrieve(), and changebasetomarker() • Use try { } catch(e) { } . The code in try will NOT trigger an error, but if there is one, will go to catch. • Also use typeof(localStorage) to test if this is defined.

  24. <button onClick="javascript:store();">Store base. </button> <button onClick="javascript:retrieve();">Restore last base. </button> <button onClick="javascript:changebasetomarker();">Change base location to last marker. </button> <br/>

  25. function store() { if (typeof(localStorage) == "undefined") { alert("Browser does not recognize HTML local storage."); } else { try { localStorage.setItem("baselat",blatlng.lat()); localStorage.setItem("baselng",blatlng.lng()); localStorage.setItem("basename",basename); } catch(e) { alert("Error with use of local storage: "+e);} } return false; }

  26. function retrieve() { if (typeof(localStorage) == "undefined") { alert("Browser does not recognize HTML local storage."); } else { try { oldlat= localStorage.getItem("baselat"); oldlng = localStorage.getItem("baselng"); oldname = localStorage.getItem("basename"); if (oldlat==null) { alert("No base stored");} else {doStuff(Number(oldlat),Number(oldlng)); basename = oldname; document.getElementById("header").innerHTML = "Base location is "+basename; } } catch(e) { alert("Error with use of local storage: "+e);} } return false; }

  27. changes base to marker function changebasetomarker() { if (lastmarker!="undefined") { doStuff(lastmarker.lat(),lastmarker.lng()); basename = "marker"; } }

  28. Comments • Error checking good! • Many GIS programs with common/similar features • Need to determine where information goes • my locations array kept information in my JavaScript

  29. Messy example • Reasons/excuses THAT ARE VERY COMMON • application grew: piled on more features. • Technology driven rather than Need driven • My need is/was to learn features and make available to students. • Added directionshttp://faculty.purchase.edu/jeanine.meyer/html5workshop/geolocationdistance5.html

  30. Anthropomorphic fallacy • Term used to attributing human thought, feelings, habits to…animals, inanimate beings… • NOT SURE HOW WIDESPREAD THIS IS/WAS: when doing robotics back at IBM Research, we used the term to assuming that the best way to automate something was to work directly from the manual way • Consider: washing clothes at the stream

  31. What is focus / unit of analysis • Robotics / manufacturing example • Replace manufacturing station Versus • Redesigning the whole line

  32. New interface design challenge • Replicate manual way • Replicate current/existing computer way with different hardware • Do something totally different • IPod • Change / reconsider what the problem is • Velcro for shoes

  33. Abdominal report • 1974! • Doctor wants to analyze data gathered in emergency room and follow-up • "Please don't make me ask for it in English. It is too complicated."

  34. Discussion • Examples?

  35. HTML5 project • Must have interaction. • Must have objective / purpose. • May be small / pilot of larger application • choosing from sets of 3 instead of tens or 100s or more • may be significant (reasoned) improvement on any of my examples • Example: directions on how to do something, cooking, travel information, teaching something, soliciting information, survey • Note: Other courses focus on database and other middleware / server-side applications.

  36. Homework • Post proposal for your HTML5 project. • Proposal ASAP. I will respond with approval and/or suggestions. • Presentation with 1-pager (abstract, relevant screen shot, all sources used INCLUDING my examples) • Presentations on March 7th.

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