server-side programming 2 - stanford university · server-side programming 2 cs147l lecture 7 mike...
TRANSCRIPT
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Server-side programming 2
CS147L Lecture 7Mike Krieger
Friday, November 13, 2009
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Intro
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Welcome back!
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By the end of today...
- Questions from implementations
- A note on Wizard of Oz
- Debugging PHP & Javascript
- More SQLite examples
- Full app: Where my friends at?
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Administrative Stuff
- One more lecture next week
- No lecture dead week
- Email me with an honor code statement stating you attended 7/8 of the lectures
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Question from Google Group
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Action on link before changing page?
- http://groups.google.com/group/cs147-tech-2009/browse_thread/thread/7b26b35f41041a28
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SolutionGive link an id:
Respond & return true:
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Any other current Qs?
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A note on WoZ
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Wizard of Oz
- Have gotten some questions about camera, SMS, phone...
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My app needs to take a picture
- Problem: iPod Touch has no camera
- WoZ: Take a screenshot of camera app from iPhone, bring it up at appropriate moment (or a video of the camera app moving around)
- I put some screenshots & video in the "resources" section
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My app needs to make a call
- Problem: iPod Touch has no phone app
- WoZ: Present fake phone call screen (or build quick one in JS), have users act out call
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App needs SMS send/receive
- WoZ: pop up Javascript alert() or prompt() with SMS message, have your app respond
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Debugging Webapps
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Quick Note
- WebKit nightly builds have terrific debugging tools
- http://webkit.org
- Windows, Mac, & Linux
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Key Questions
- Is the right data living on the server?
- Is the right data making it back from the server?
- Is the Javascript parsing the data correctly?
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Is the right data living on the server?
- Run same SELECT command using command-line tool
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dumpdb.phpIn this week's folder, will go through all your entries in all your tables and print them out.
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Running PHP from commandline
php yourfilename.php
No browser required!
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Is it making it back?
- Just browser will work
- On Mac, can also use HTTP Analyzer
- Use Inspector's Request view
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DemosJust browser (friends-1.php)HTTP ClientSafari Inspector
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Debugging Javascript
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General approach
- Set breakpoints in Safari
- Use console.log when breakpoints are impractical / too much work
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Demosdebug-1 to debug-3.html
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FriendFinder
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Demo app features
- Locate user (we know how to do this)
- Update a central DB of locations
- Show:
- People around me
- Friend list
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Approach
- Write JS and PHP separately, join near the end (you can do this on your team too)
- Use browser/HTTP Client to debug PHP calls
- Use Inspector to debug & develop JS & use fake data in meantime
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Getting started
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friends-0
- jQTouch template
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friends-0.html
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friends-1.html
- Skeleton menu
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friends-1.html
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friends-2.html
- Get location
- Get a user's status
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Now-familiar location
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prompt()
- Takes a string, returns whatever was entered into the prompt window
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Callback
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friends-3.html
- Provide confirmation that the status was sent to server
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Feedback
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friends-4.html
- Get a username and save it for this particular user using window.localStorage
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localStorage
- HTML5 specification
- Provides key/value store
- Easier & more robust than using cookies
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Two functionswindow.localStorage.getItem("itemName");
window.localStorage.setItem("itemName", "value");
// example:
if (!window.localStorage.getItem("city")) {� // prompt user for city� var city = prompt("What city are you in?");� window.localStorage.setItem("city", city);}
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global object
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friends-5.php
- Cache the found location globally so we don't have to fetch it every time we switch pages
- Have getLocation handle different callbacks
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Save Position
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Callbacks
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Flexibility
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friends-6
- Beginning of findNearby function
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friends-7.php
- Import geoutil from last week's code
- Adding placeholder JSON object for response
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friends-8.php
- getFriends() function
-
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Server-side
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Preparing the DB
- preparedb.php
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Make the tables
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Clear the tables
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Fixture data
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DB Commands
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Iterate over friends
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Iterate over others
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checkin.php// grab data
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Insert row
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nearby.php// grab params
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Grab all checkins// in real app we would search in the SELECT
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Find nearby
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Sort & Print
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friends.php// JOIN
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Run command
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Iterate over results
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Sort & Print
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Closing the loop
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friends-9.html
- .get -> .getJSON
- Remove placeholder data
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Final Demo
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Q’s?
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