Computer Science and Engineering
Christian R. Shelton, Professor
Current Course (Fall )
- CS Fundamentals of Machine Learning
- CS 14 (Introduction to Data Structures and Algorithms): Fall
- CS (Introduction to Artificial Intelligence): Winter , Winter , Fall , Winter
- CS (Introduction to Machine Learning and Data Mining): Fall , Fall , Fall , Fall , Spring , Spring
- CS M (Project in Computer Science: AI): Summer , Winter , Fall , Spring
- CS (Principles of Programming Languages): Winter , Fall , Spring , Spring , Winter , Winter
- CS (Artificial Intelligence): Spring , Spring Fall , Winter , Spring
- CS (Fundamentals of Machine Learning): Winter
- CS (Probabilistic Models for Artificial Intelligence): Winter , Winter , Fall , Winter , Fall , Fall , Spring , Spring
- CS (Machine Learning): Spring , Spring , Spring , Fall , Fall , Fall , Spring
- CS / (Seminar in Computer Science): Spring (deep learning), Spring (dynamic processes), Spring (deep learning), Winter (dynamic processes), Winter (point processes), Spring (dynamic processes) Spring (supervised learning), Fall (machine learning)
- CS (Colloquium in Computer Science):
- CS Seminar on Advanced C++
CS Text Analytics in the Big Data Era
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Shortest version: The commented out call in the needs to be uncommented.
Longer explanation: In the during the a is set for ms which then triggers the /s if present (and conditionally triggered). Since is called in the event handling call chain for an , the internal method is invoked that verifies that the calling thread is from the correct context. Without , this work is processed in the context of the callback thread which throws an and includes the message:
'The current thread is not associated with the Dispatcher. Use InvokeAsync() to switch execution to the Dispatcher when triggering rendering or component state.'
Worth noting per the official docs that normally the event handler swallows all exceptions, except in handling where the exception is captured on the and propagated back to the calling thread. https://docs.microsoft.com/en-us/dotnet/api/system.timers.timer?view=net#remarks
This manifests in true multithreaded environments like server side Blazor, and units testing that involves a component in the render.
By uncommenting the the correct context is used to execute the code and the issue is resolved.
In a debugging session, on the rendering of the above code an exception should be detected from the thread that is triggered by the timer.
CS-290-Week8 Git/Post program
Requirements This week you will write single page web application that will receive incoming POST and GET requests. If it is a POST request it should say at the top of the page, in an H1 tag "POST Request Received". If a GET request is received it should say "GET Request Received" in the same H1 tag.
Below that you can, at your discretion, create either a list or a table which clearly shows all parameter names and values which were sent in the URL query string for both a GET and POST request (you can still send stuff in the URL when making a POST request).
Below that, if it is a POST request, you should list, again either in a list or a table, all the property names and values that were received in the request body. It should be able to accepter either a well formatted URL encoded query string (x-www-form-urlencoded) or JSON data.
Deliverables You should submit a single zip file containing all of your source code.
As an exception to the general call rule you can copy and paste the code from the lecture without citing or explaining it. This does not apply to the routes used for the GET and POST submissions. So all the boilerplate code about setting up handlebars, handling 404's, launching the app can all be copied because it is really boring and you will be using it a lot. The handlers for the routes providing the data should not be copied from the lectures.
This should include the .js files, your package.json file, and the directories containing your views, templates and static files. Do not include the node_modules directories in this zip file.
In addition include a URL as a comment added to your submission which links to a live, functioning version of your page. It is your responsibility to keep this running until you get a posted grade back. When you are done and happy with your code, I recommend you start a new instance of node.js using the forever application on a different port than you use for development. Then never touch it again until we are done grading. If you have questions of making it running on the engineering flip, please check out the Week one content and assignment. (If on engineering flip, the URL should be something like http://flipX.engr.oregonstate.edu:YYYY, do not use localhost)
If it is not up and running when we try to grade it then there will be a flat 5% deduction and we will contact you to get it up and running so we can grade it.
Note this is graded like a full HW assignment so it is weighted more heavily than an activity. That said, if all goes well it should not take that long. Do not expect the coming weeks assignments to be as quick. I want to make sure to leave some buffer here for problems that will arise given you are brand new to server side programming.
Github cs 290
Assignment and Code Blog entry due at pm on Monday, 6/4/
Demo due by pm on Friday, 6/15/
The goal of this assignment is to start working with Handlebars and Express. The code that's currently in this repo implements a site that's served completely statically. Specifically, there is a directory that contains a number of static files that are served by a simple Express server in . Your job in this assignment is to templatize this existing site. Specifically, you must complete the following tasks:
1. Implement a twit template and use it on the client side
When the user adds a new twit using the "create twit" button in the current site, the client-side code in calls a function , which uses native JS methods to construct a DOM element representing a new twit based on data passed as arguments to the function and inserts that new twit element into the DOM at the appropriate location.
Your first task in this assignment is to write a Handlebars template to represent a single twit and then to use that template in instead of the native JS methods currently used to create a new twit and insert it into the DOM. Here are some specific things you'll have to do to make this happen:
Implement your twit template in its own file. You'll use this template in later steps, too.
Add to your file a new build script that uses to pre-compile your twit template into a JS file. Note that you'll need to install as a dependency of your package in order to do this pre-compilation. Make sure your server process in serves this generated JS file, and make sure to hook your build script up so it's run every time you use to start the server, just in case you change your template.
Make sure your client-side HTML code includes your generated JS script for the twit template. Also make sure your client-side HTML code includes the Handlebars runtime library, so it can actually use your template.
Replace the native JS functions currently used in to build and insert a new twit element with a call to your twit template function, making sure to pass the appropriate arguments into the twit template function. Note that your twit template function will generate an HTML string, not a DOM element, so you'll have to use a slightly different approach to insert the new twit into the DOM.
2. Templatize the twits page to replace
The current site uses a hard-coded page in to display a page containing 8 twits. Your next task in the assignment is to implement a templatized version of this twits page, and to use data stored on the server side to dynamically generate the twits page when a client requests it. Specifically, you are provided with raw data in representing the current set of 8 twits. You should use that data in conjunction with a set of templates you write to replace the functionality . Here are some specific things you'll have to do to make this happen:
Implement one or more template files to replicate the structure of .
- Your new set of templates can use a layout template if you'd like. This isn't strictly necessary here, but you'll have to do it eventually to earn full credit for the assignment.
In these new templates, instead of hard-coding the twits to be displayed, use the twit template you created in step 1 as a partial to render each twit in an array of twits that's passed as a template argument.
In your server process in , set up your Express server to use as the view engine. Note that you'll need to install as a dependency of your package.
Implement a route in your server process for the root path . Make sure this route's middleware is called before the middleware function that serves . Within this new route, you should respond to the client by using your newly-created template(s) to render the twits page (which should look the same as ). In particular, make sure you load the raw twit data from and pass all of this twit data into your template(s) using the appropriate template argument(s). When you render the twits page this way, make sure to respond with status
3. Templatize the page
The current site contains a route in the server process in that responds with a status and an error page hard-coded in whenever a client requests an unknown path. Your next task for the assignment is to turn this page into a template.
There are two ways to do this. The "easy" way is just to basically copy into a new Handlebars template, e.g. . However, if you do this, you'll notice that there is a lot of duplicated code between your template and your twits page template. To earn full credit, you must templatize all of the elements that are common to both pages and re-use those templates whenever those elements need to be rendered. Specifically, here are some of the things you'll need to do to accomplish this:
Write a layout template that contains the HTML skeleton that's common to both the page and the twits page. Make sure all of the needed CSS and client-side JS is included in this layout template. Also make sure you set your server process up to use this layout template. Remove this HTML skeleton from the and twits page templates, and allow it to be provided via your new layout template.
Write a partial representing each of the visual elements that are common to both the page and the twits page, e.g. the page header. Use these partials to render these elements in each page. You can go even further than this if you like, writing and using a partial for each discrete "component" in the site, e.g. the create twit button/modal, but this is not necessary.
4. Implement a page to render a single twit
Finally, use the twit template you implemented in step 1 to create a new route that displays a single twit. This route should behave as follows:
When a client requests a path of the form , where is an integer that is within the bounds of the array of twits stored in (i.e. is between 0 and 7), you should respond with a page that contains only the corresponding twit. If is not within the bounds of the array of twits, or if it's not an integer, you should respond with a status and the page you implemented in step 3.
Your single-twit page should contain only the site header and the individual twit that was requested, the following things should not be displayed or even present in the DOM:
- Any twits other than the one that was requested.
- The "create twit" button.
- The "create twit" modal and its backdrop.
For full credit, you should use the same template to render both your root path and the path. You can still earn partial credit by implementing separate templates for each of these paths.
Add an entry to your Code Blog reflecting on your experience with this assignment. Here are some questions you could answer (though these aren't the only ones):
What was challenging about the assignment, and what specific kinds of problems did you have. How did you solve those problems?
What did you learn from the assignment? Were there any special insights you had? What did you find that you already knew?
What kinds of resources were helpful for completing the assignment? Specific websites? Lectures? The class Piazza forum? The TAs? How did you use each of these resources?
What are one or two things you had to Google to complete the assignment?
As always, we'll be using GitHub Classroom for this assignment, and you will submit your assignment via GitHub. Just make sure your completed files are committed and pushed by the assignment's deadline to the master branch of the GitHub repo that was created for you by GitHub Classroom. A good way to check whether your files are safely submitted is to look at the master branch your assignment repo on the github.com website (i.e. https://github.com/OSU-CSSp18/assignmentYourGitHubUsername/). If your changes show up there, you can consider your files submitted.
In addition to submitting your assignment via GitHub, you must submit the URL to your code blog entry (e.g. http://web.engr.oregonstate.edu/~YOUR_ONID_ID/cs/blog.html) via Canvas by the due date specified above.
The assignment is worth points total:
25 points: the client-side JS uses a pre-compiled twit template to insert new twits, as described above
20 points: the server uses your twit template as a partial within a larger template to render the page of all twits on the root path , as described above
10 points: the server uses a template to render the page, as described above
25 points: the server renders a page displaying a single twit on the path , as described above
10 points: the site is fully templatized, i.e. no HTML code is duplicated; re-used components of the site are written in partials, and the HTML skeleton common to every page is written in a layout
10 points: the same template is used to render both the page displaying all twits (i.e. ) and the page displaying a single twit (i.e. )
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