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Khan Academy Javascript Technical Q&A

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A forum for technical Javascript programming questions in the Khan Academy Computer Science classroom.

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Larry Serflaten

9/20/16

How to run KA programs on my own website?

You need to create a page with a canvas element and include some script to run the processing.js

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How to run KA programs on my own website?

You need to create a page with a canvas element and include some script to run the processing.js

9/20/16

Larry Serflaten

2/9/13

Welcome to the unofficial Khan Academy Javascript programming forum!

The purpose of this forum is to provide programmers a place to ask questions about javascript

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Welcome to the unofficial Khan Academy Javascript programming forum!

The purpose of this forum is to provide programmers a place to ask questions about javascript

2/9/13

3/8/22

Urgent Need for Java Developer w/ Oracle PL/SQL Experience

Java Developer w/ Oracle PL/SQL Experience REMOTE 12+ Months Phone/Skype Hire Requirements : •

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Urgent Need for Java Developer w/ Oracle PL/SQL Experience

Java Developer w/ Oracle PL/SQL Experience REMOTE 12+ Months Phone/Skype Hire Requirements : •

3/8/22

Inger Hohler, … Larry Serflaten9

2/11/22

When, if ever, would it be a good idea to add or delete properties on an object?

This is an attempt to create a code section using three tildes: ```no indentation three spaces

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When, if ever, would it be a good idea to add or delete properties on an object?

This is an attempt to create a code section using three tildes: ```no indentation three spaces

2/11/22

11/23/21

The Hitchhiker's Guide to the Technical Interview

How many interviews have you gone through before ending up in the current company? Have you ever

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The Hitchhiker's Guide to the Technical Interview

How many interviews have you gone through before ending up in the current company? Have you ever

11/23/21

Hunter R. Shaw, Inger Hohler2

7/28/21

Scrolling in Processing.js programs; prevent default and do what you please

I'm no HTML/CSS/JS specialist either, but I'm wondering what you need this code for. This

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Scrolling in Processing.js programs; prevent default and do what you please

I'm no HTML/CSS/JS specialist either, but I'm wondering what you need this code for. This

7/28/21

Shiva sandupatla

3/24/21

Can't capture network requests in iframe using service worker

I am unable to intercept the fetch request from iframe using service worker Firstly I have used

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Can't capture network requests in iframe using service worker

I am unable to intercept the fetch request from iframe using service worker Firstly I have used

3/24/21

Inger Hohler, … Larry Serflaten8

3/23/21

Shallow copying in Javascript - what for?

Again, both answers are very helpful. When I read things online there is lots of information about

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Shallow copying in Javascript - what for?

Again, both answers are very helpful. When I read things online there is lots of information about

3/23/21

imleg...@gmail.com

7/26/20

how to keep the phrase when I delete the charactor of the abbrev?

Here is the thing. I have a phrase which abbrev is 'ck'. ck is for check. When I type ck and

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how to keep the phrase when I delete the charactor of the abbrev?

Here is the thing. I have a phrase which abbrev is 'ck'. ck is for check. When I type ck and

7/26/20

Liam Donohue, Larry Serflaten2

4/29/20

is it possible to use require(); in js?

Not at Khan Academy. Require is not a part of JS. it is apart of node, which KA does not support in

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is it possible to use require(); in js?

Not at Khan Academy. Require is not a part of JS. it is apart of node, which KA does not support in

4/29/20

openin...@gmail.com, … ling...@gmail.com4

2/11/20

TypeError: document.getelementbyid(...) is null

Got it. Thank you. On Monday, February 10, 2020 at 12:26:16 PM UTC+5:30, ling...@gmail.com wrote:

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TypeError: document.getelementbyid(...) is null

Got it. Thank you. On Monday, February 10, 2020 at 12:26:16 PM UTC+5:30, ling...@gmail.com wrote:

2/11/20

Roman Gelfand, Larry Serflaten3

5/15/19

Displaying Query Progress in Web Page

Roman Gelfand wrote: I forgot to attach doloading and hideloading function I would venture to say you

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Displaying Query Progress in Web Page

Roman Gelfand wrote: I forgot to attach doloading and hideloading function I would venture to say you

5/15/19

rahulka...@gmail.com

4/24/19

want to rewrite a text file inside existing zip folder

How to rewrite the existing text file inside zip archive through javascript JSZip? Want to change the

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want to rewrite a text file inside existing zip folder

How to rewrite the existing text file inside zip archive through javascript JSZip? Want to change the

4/24/19

prabhat...@gmail.com, Arto2

1/8/19

scrollTo not working on inside of div

Hi, Are You tried to search in https://stackoverflow.com.? On Tuesday, January 8, 2019 at 3:14:20 PM

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scrollTo not working on inside of div

Hi, Are You tried to search in https://stackoverflow.com.? On Tuesday, January 8, 2019 at 3:14:20 PM

1/8/19

Inger Hohler, Larry Serflaten3

8/27/18

Variable scope surprise

Just letting you know I'm working on it. It will take a while before I'm entirely comfortable

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Variable scope surprise

Just letting you know I'm working on it. It will take a while before I'm entirely comfortable

8/27/18

Inger Hohler, … Larry Serflaten4

8/24/18

typeof - some unexpected results

Bob Lyon wrote: The typeof null is "object" which is neither an anomaly or bug. null is the

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typeof - some unexpected results

Bob Lyon wrote: The typeof null is "object" which is neither an anomaly or bug. null is the

8/24/18

phillip jordan, … Jett Burns3

5/26/18

Platforms for gaming

This isn't about Khan Academy, please Google your question. On Friday, May 22, 2015 at 10:24:47

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Platforms for gaming

This isn't about Khan Academy, please Google your question. On Friday, May 22, 2015 at 10:24:47

5/26/18

zaba...@gmail.com

5/5/18

WHY MARKER IS NOT VISIBLE IN THE GOOGLE MAP WHICH IS IN THE WHILE LOOP OF THE CODE

<script type="text/javascript" > var latt=<?php echo json_encode($latt); ?>;

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WHY MARKER IS NOT VISIBLE IN THE GOOGLE MAP WHICH IS IN THE WHILE LOOP OF THE CODE

<script type="text/javascript" > var latt=<?php echo json_encode($latt); ?>;

5/5/18

Larry Serflaten, rachae...@gmail.com8

3/13/18

WORKING OFFLINE

Ahh I figured it out. I didn't have the newest version of processing JS. I had made my way to

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WORKING OFFLINE

Ahh I figured it out. I didn't have the newest version of processing JS. I had made my way to

3/13/18

Inger Hohler, … Larry Serflaten3

1/6/18

Interest in KACP Challenge Council

Bob Lyon wrote: The URL that you posted is broken. Can you try again? Thanks. It works for me. Here

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Interest in KACP Challenge Council

Bob Lyon wrote: The URL that you posted is broken. Can you try again? Thanks. It works for me. Here

1/6/18

Larry Serflaten, … Bob Lyon5

1/5/18

If you look at the implementation of `text`, it splits its first argument into separate lines and

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If you look at the implementation of `text`, it splits its first argument into separate lines and

1/5/18

Larry Serflaten

9/1/17

How to wave hands for space key?

Paste the code below into a new program and see if this is close to what you want: var keys = []; var

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How to wave hands for space key?

Paste the code below into a new program and see if this is close to what you want: var keys = []; var

9/1/17

Bob Lyon, keit...@gmail.com3

3/10/17

Porting Khan Academy Javascript to jsFiddle.net

I am uncertain as to what I did to lose it, or what it contained. This fsFiddle template is how I

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Porting Khan Academy Javascript to jsFiddle.net

I am uncertain as to what I did to lose it, or what it contained. This fsFiddle template is how I

3/10/17

Bob Lyon, Larry Serflaten2

2/8/16

baffled by text positioning for ONE user

Bob Lyon wrote: The program only uses the Processing.js default font. What can explain such a

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baffled by text positioning for ONE user

Bob Lyon wrote: The program only uses the Processing.js default font. What can explain such a

2/8/16

Bob Lyon, … Larry Serflaten8

10/13/15

Browsers' misbehavior of COPY from println's console

On Monday, October 12, 2015 at 10:32:21 PM UTC-7, Larry Serflaten wrote: Using IE the code looks OK

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Browsers' misbehavior of COPY from println's console

On Monday, October 12, 2015 at 10:32:21 PM UTC-7, Larry Serflaten wrote: Using IE the code looks OK

10/13/15

SpongeJr, … primenum...@gmail.com5

10/11/15

What determines a line of code?

On Saturday, June 20, 2015 at 10:40:03 PM UTC-4, SpongeJr wrote: > I've done a little Googling

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What determines a line of code?

On Saturday, June 20, 2015 at 10:40:03 PM UTC-4, SpongeJr wrote: > I've done a little Googling

10/11/15

Bob Lyon, Element1182

9/25/15

should rending matrix functions get along with shape functions?

I think what vertex does is to push a coordinate (in that case (0, 0)) to memory such that endShape

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should rending matrix functions get along with shape functions?

I think what vertex does is to push a coordinate (in that case (0, 0)) to memory such that endShape

9/25/15

9/2/15

#SeleniumWebdriver #LiveTraining

#SeleniumWebdriver #LiveTraining Visit: www.itelearn.com/events/selenium-webdriver-training You are

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#SeleniumWebdriver #LiveTraining

#SeleniumWebdriver #LiveTraining Visit: www.itelearn.com/events/selenium-webdriver-training You are

9/2/15

SpongeJr, Larry Serflaten6

6/27/15

"Making the move" (working title): converting your JS+PJS projects to HTML+JS projects

SpongeJr wrote: I've been thinking more on this, quite a bit. I think the Killer App here is

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"Making the move" (working title): converting your JS+PJS projects to HTML+JS projects

SpongeJr wrote: I've been thinking more on this, quite a bit. I think the Killer App here is

6/27/15

SpongeJr, Bob Lyon2

6/27/15

[PJS] Custom cursors and no cursors

noCurse(); should work, but it doesn't. I complained months ago to no avail. cursor("none

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[PJS] Custom cursors and no cursors

noCurse(); should work, but it doesn't. I complained months ago to no avail. cursor("none

6/27/15

SpongeJr, … Bob Lyon5

6/18/15

precision in JavaScript numbers

Thanks for all of the great information, both of you! I'm more confident now in how I'm

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precision in JavaScript numbers

Thanks for all of the great information, both of you! I'm more confident now in how I'm

6/18/15

Larry Serflaten, … Element1183

6/17/15

Open a new window to about:blank

To write things that can be copied/pasted, you can always use println().

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Open a new window to about:blank

To write things that can be copied/pasted, you can always use println().

6/17/15

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