Soma at 18:01, 21 November 2013

2013-11-21T18:01:11Z

← Older revision		Revision as of 18:01, 21 November 2013
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			The audio from the lecture given on November 11, 2013 is [http://homeostasis.scs.carleton.ca/~soma/webfund-2013f/lectures/comp2406-2013f-lec15-11Nov2013.m4a here].

	==Notes==		==Notes==

Sarahmathieson: Created page with "==Notes== ===Assignment 3 Tips=== * Question 6 : Every time the user score changes, you can update the high score ** Cheating! It doesn’t have to be constantly updated in ..."

2013-11-11T23:42:06Z

Created page with "==Notes== ===Assignment 3 Tips=== * Question 6 : Every time the user score changes, you can update the high score ** Cheating! It doesn’t have to be constantly updated in ..."

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==Notes==

===Assignment 3 Tips===
* Question 6 : Every time the user score changes, you can update the high score
** Cheating! It doesn’t have to be constantly updated in the background
** Or could use long poling
*** Do ajax type call on the client
*** On the server you would wait, set up a callback for when the high score changes
* Question 4:
** var container = $(‘#container’);
*** returns a jQuery object
** //for the canvas:
*** c = $(‘canvas’)[0];
** Anil will post something online about the problem errorsount.play();
** Need to use jQuery equivalent for the container.offsetLeft etc in function init()

===Going through tutorial 9===
* In package.json there is a new line:
** "validator": "*"
*** used for sanitizing user input
*** req.session.player = sanitize(player).escape();
**** sanitize sooner rather than later
**** we only used this in the start function because this is the only user input that was taken
* Want to send something back to the client?
** You can just use ‘send’ in node
* Complexity has been moved to the client code
* On the browser:
** If you want privacy, the only way you have it is doing it within functions!
*** In public/javascripts/adventure.js
**** Anonymous function is defined
**** Prevents you from polluting the global file scope
** In public/javascripts/adventure.js
*** $.getJSON("/getContents", function(room)
**** Get JSON object from server
**** getContents is a function in routes/index.js
**** this will return a page with an enoded JSON object
***** jQuery will happily convert this
** var exits;
*** doesn’t do anything
$('.exits').remove();
room.roomExits.forEach(function(theExit) {
$('#exitList').append(
'<button type="button" id="' + theExit +
'" class="btn btn-default exits">'
+ theExit + '</button>');
$('#'+theExit).on('click', function() {
$.post("/doAction", {action: "move",
room: theExit});
getRoom();
});
});
*** Get rid of all of the exits
*** Add button
*** Add even handler
*** When someone clicks on the mouse, it creates another post
*** The value of the exit is coming from the argument to the function
*** Array objects in JavaScript have a standard object called foreach
** Every webpage defines its own JavaScript scope
*** Script is similar to include in C
** Implications of scripts
*** You don’t know what code you’re incorporating
*** It changes from minute to minute
*** It runs in the same executions context of your code
*** You have to deal with the DOM – it is global and everyone potentially has access to it
**** What’s to say that code isn’t changing your code
**** There are some things you can do, but it’s not easy

WebFund 2013F Lecture 15 - Revision history

Soma at 18:01, 21 November 2013

Sarahmathieson: Created page with "==Notes== ===Assignment 3 Tips=== * Question 6 : Every time the user score changes, you can update the high score ** Cheating! It doesn’t have to be constantly updated in ..."