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Meta Comment thread leads to "404 Not Found" error page

1 answer  ·  posted 6mo ago by clemens‭  ·  edited 5mo ago by Monica Cellio‭

Question bug status-completed
#8: Post edited by user avatar Monica Cellio‭ · 2026-04-19T02:30:51Z (5 months ago)
bug
bug status-completed
#7: Post edited by user avatar clemens‭ · 2026-04-02T01:56:10Z (6 months ago)
  • [This answer](https://math.codidact.com/posts/295855/295859#answer-295859) has one comment, $X\times X \cong X$. But when I attempt to click on the comment to show it, it leads to a 404 page.
  • Why is this?
  • (Update: the comment is not deleted as I had previously thought; it is accessible at https://math.codidact.com/comments/thread/11717 , and one can access it by Ctrl-clicking to open it in a new tab. The problem is that some JavaScript function in Codidact is returning "undefined" as the comment thread number and so the Codidact website makes an XHR request to https://math.codidact.com/comments/thread/undefined/content?inline=true&show_deleted_comments=0 ---the "undefined" there ought to be "11717".)
  • (Update 2: It seems to have something to do with math in the comment thread title---see the test comment I made to this post, titled $X × X$.)
  • (Update 3: The problem is with the event-listener code in line 73 of https://math.codidact.com/assets/application-ba1f9d37b09ac57d363a53b8936f4b70438bff1fbe2ae8408013ec99fc833225.js . The event-listener sets the "i" object, whose "data-thread" attribute yields the comment thread number, as the target of the "click" event. This works when one clicks on normal text (because the immediately enclosing element is then an a.js--comment-link element) but does not work when one clicks on math (because the immediately enclosing element is then an mjx-container or similar element). Hence the [previous bug-report](https://meta.codidact.com/posts/295715) appears incorrect when it says that refreshing the page fixed the problem: in fact, the issue is still present if you click on the MathJax $+1$, but when you click elsewhere the comment expands correctly (so, probably, the user clicked on the $+1$ the first time around and then clicked elsewhere the next time). You can confirm that this is the root of the problem by using the inspector to edit (say, italicize) a part of the text in a comment title and then clicking on the italicized part; it will give a 404 error.)
  • (Hence, to fix the problem, change the code
  • `async e => {
  • if (e.ctrlKey || e.metaKey) return;
  • e.preventDefault();
  • const i = $(e.target),
  • a = i.data("thread");
  • t(n(i), a)
  • }` to something like `async e => {
  • if (e.ctrlKey || e.metaKey) return;
  • e.preventDefault();
  • const i = $(e.target);
  • while (!i.classNames.contains("js--comment-link")) i=i.parentElement;
  • a = i.data("thread");
  • t(n(i), a)
  • }`; I don't know what code this corresponds to in the non-minified JS, though.)
  • [This answer](https://math.codidact.com/posts/295855/295859#answer-295859) has one comment, $X\times X \cong X$. But when I attempt to click on the comment to show it, it leads to a 404 page.
  • Why is this?
  • (Update: the comment is not deleted as I had previously thought; it is accessible at https://math.codidact.com/comments/thread/11717 , and one can access it by Ctrl-clicking to open it in a new tab. The problem is that some JavaScript function in Codidact is returning "undefined" as the comment thread number and so the Codidact website makes an XHR request to https://math.codidact.com/comments/thread/undefined/content?inline=true&show_deleted_comments=0 ---the "undefined" there ought to be "11717".)
  • (Update 2: It seems to have something to do with math in the comment thread title---see the test comment I made to this post, titled $X × X$.)
#6: Post edited by user avatar clemens‭ · 2026-04-02T01:55:36Z (6 months ago)
  • [This answer](https://math.codidact.com/posts/295855/295859#answer-295859) has one comment, $X\times X \cong X$. But when I attempt to click on the comment to show it, it leads to a 404 page.
  • Why is this?
  • (Update: the comment is not deleted as I had previously thought; it is accessible at https://math.codidact.com/comments/thread/11717 , and one can access it by Ctrl-clicking to open it in a new tab. The problem is that some JavaScript function in Codidact is returning "undefined" as the comment thread number and so the Codidact website makes an XHR request to https://math.codidact.com/comments/thread/undefined/content?inline=true&show_deleted_comments=0 ---the "undefined" there ought to be "11717".)
  • (Update 2: It seems to have something to do with math in the comment thread title---see the test comment I made to this post, titled $X × X$.)
  • (Update 3: The problem is with the event-listener code in line 73 of https://math.codidact.com/assets/application-ba1f9d37b09ac57d363a53b8936f4b70438bff1fbe2ae8408013ec99fc833225.js . The event-listener sets the "t" object, whose "data-thread" attribute yields the comment thread number, as the target of the "click" event. This works when one clicks on normal text (because the immediately enclosing element is then an a.js--comment-link element) but does not work when one clicks on math (because the immediately enclosing element is then an mjx-container or similar element). Hence the [previous bug-report](https://meta.codidact.com/posts/295715) appears incorrect when it says that refreshing the page fixed the problem: in fact, the issue is still present if you click on the MathJax $+1$, but when you click elsewhere the comment expands correctly (so, probably, the user clicked on the $+1$ the first time around and then clicked elsewhere the next time). You can confirm that this is the root of the problem by using the inspector to edit (say, italicize) a part of the text in a comment title and then clicking on the italicized part; it will give a 404 error.)
  • (Hence, to fix the problem, change the code
  • `async e => {
  • if (e.ctrlKey || e.metaKey) return;
  • e.preventDefault();
  • const i = $(e.target),
  • a = i.data("thread");
  • t(n(i), a)
  • }` to something like `async e => {
  • if (e.ctrlKey || e.metaKey) return;
  • e.preventDefault();
  • const i = $(e.target);
  • while (!i.classNames.contains("js--comment-link") i=i.parentElement;
  • a = i.data("thread");
  • t(n(i), a)
  • }`; I don't know what code this corresponds to in the non-minified JS, though.)
  • [This answer](https://math.codidact.com/posts/295855/295859#answer-295859) has one comment, $X\times X \cong X$. But when I attempt to click on the comment to show it, it leads to a 404 page.
  • Why is this?
  • (Update: the comment is not deleted as I had previously thought; it is accessible at https://math.codidact.com/comments/thread/11717 , and one can access it by Ctrl-clicking to open it in a new tab. The problem is that some JavaScript function in Codidact is returning "undefined" as the comment thread number and so the Codidact website makes an XHR request to https://math.codidact.com/comments/thread/undefined/content?inline=true&show_deleted_comments=0 ---the "undefined" there ought to be "11717".)
  • (Update 2: It seems to have something to do with math in the comment thread title---see the test comment I made to this post, titled $X × X$.)
  • (Update 3: The problem is with the event-listener code in line 73 of https://math.codidact.com/assets/application-ba1f9d37b09ac57d363a53b8936f4b70438bff1fbe2ae8408013ec99fc833225.js . The event-listener sets the "i" object, whose "data-thread" attribute yields the comment thread number, as the target of the "click" event. This works when one clicks on normal text (because the immediately enclosing element is then an a.js--comment-link element) but does not work when one clicks on math (because the immediately enclosing element is then an mjx-container or similar element). Hence the [previous bug-report](https://meta.codidact.com/posts/295715) appears incorrect when it says that refreshing the page fixed the problem: in fact, the issue is still present if you click on the MathJax $+1$, but when you click elsewhere the comment expands correctly (so, probably, the user clicked on the $+1$ the first time around and then clicked elsewhere the next time). You can confirm that this is the root of the problem by using the inspector to edit (say, italicize) a part of the text in a comment title and then clicking on the italicized part; it will give a 404 error.)
  • (Hence, to fix the problem, change the code
  • `async e => {
  • if (e.ctrlKey || e.metaKey) return;
  • e.preventDefault();
  • const i = $(e.target),
  • a = i.data("thread");
  • t(n(i), a)
  • }` to something like `async e => {
  • if (e.ctrlKey || e.metaKey) return;
  • e.preventDefault();
  • const i = $(e.target);
  • while (!i.classNames.contains("js--comment-link")) i=i.parentElement;
  • a = i.data("thread");
  • t(n(i), a)
  • }`; I don't know what code this corresponds to in the non-minified JS, though.)
#5: Post edited by user avatar clemens‭ · 2026-04-02T01:53:21Z (6 months ago)
Completed the diagnosis for the problem
  • [This answer](https://math.codidact.com/posts/295855/295859#answer-295859) has one comment, $X\times X \cong X$. But when I attempt to click on the comment to show it, it leads to a 404 page.
  • Why is this?
  • (Update: the comment is not deleted as I had previously thought; it is accessible at https://math.codidact.com/comments/thread/11717 , and one can access it by Ctrl-clicking to open it in a new tab. The problem is that some JavaScript function in Codidact is returning "undefined" as the comment thread number and so the Codidact website makes an XHR request to https://math.codidact.com/comments/thread/undefined/content?inline=true&show_deleted_comments=0 ---the "undefined" there ought to be "11717".)
  • (Update 2: It seems to have something to do with math in the comment thread title---see the test comment I made to this post, titled $X × X$.)
  • [This answer](https://math.codidact.com/posts/295855/295859#answer-295859) has one comment, $X\times X \cong X$. But when I attempt to click on the comment to show it, it leads to a 404 page.
  • Why is this?
  • (Update: the comment is not deleted as I had previously thought; it is accessible at https://math.codidact.com/comments/thread/11717 , and one can access it by Ctrl-clicking to open it in a new tab. The problem is that some JavaScript function in Codidact is returning "undefined" as the comment thread number and so the Codidact website makes an XHR request to https://math.codidact.com/comments/thread/undefined/content?inline=true&show_deleted_comments=0 ---the "undefined" there ought to be "11717".)
  • (Update 2: It seems to have something to do with math in the comment thread title---see the test comment I made to this post, titled $X × X$.)
  • (Update 3: The problem is with the event-listener code in line 73 of https://math.codidact.com/assets/application-ba1f9d37b09ac57d363a53b8936f4b70438bff1fbe2ae8408013ec99fc833225.js . The event-listener sets the "t" object, whose "data-thread" attribute yields the comment thread number, as the target of the "click" event. This works when one clicks on normal text (because the immediately enclosing element is then an a.js--comment-link element) but does not work when one clicks on math (because the immediately enclosing element is then an mjx-container or similar element). Hence the [previous bug-report](https://meta.codidact.com/posts/295715) appears incorrect when it says that refreshing the page fixed the problem: in fact, the issue is still present if you click on the MathJax $+1$, but when you click elsewhere the comment expands correctly (so, probably, the user clicked on the $+1$ the first time around and then clicked elsewhere the next time). You can confirm that this is the root of the problem by using the inspector to edit (say, italicize) a part of the text in a comment title and then clicking on the italicized part; it will give a 404 error.)
  • (Hence, to fix the problem, change the code
  • `async e => {
  • if (e.ctrlKey || e.metaKey) return;
  • e.preventDefault();
  • const i = $(e.target),
  • a = i.data("thread");
  • t(n(i), a)
  • }` to something like `async e => {
  • if (e.ctrlKey || e.metaKey) return;
  • e.preventDefault();
  • const i = $(e.target);
  • while (!i.classNames.contains("js--comment-link") i=i.parentElement;
  • a = i.data("thread");
  • t(n(i), a)
  • }`; I don't know what code this corresponds to in the non-minified JS, though.)
#4: Post edited by user avatar clemens‭ · 2026-04-01T18:04:22Z (6 months ago)
  • [This answer](https://math.codidact.com/posts/295855/295859#answer-295859) has one comment, $X\times X \cong X$. But when I attempt to click on the comment to show it, it leads to a 404 page.
  • Why is this?
  • (Update: the comment is not deleted as I had previously thought; it is accessible at https://math.codidact.com/comments/thread/11717 , and one can access it by Ctrl-clicking to open it in a new tab. The problem is that some JavaScript function in Codidact is returning "undefined" as the comment thread number and so the Codidact website makes an XHR request to https://math.codidact.com/comments/thread/undefined/content?inline=true&show_deleted_comments=0 ---the "undefined" there ought to be "11717".)
  • [This answer](https://math.codidact.com/posts/295855/295859#answer-295859) has one comment, $X\times X \cong X$. But when I attempt to click on the comment to show it, it leads to a 404 page.
  • Why is this?
  • (Update: the comment is not deleted as I had previously thought; it is accessible at https://math.codidact.com/comments/thread/11717 , and one can access it by Ctrl-clicking to open it in a new tab. The problem is that some JavaScript function in Codidact is returning "undefined" as the comment thread number and so the Codidact website makes an XHR request to https://math.codidact.com/comments/thread/undefined/content?inline=true&show_deleted_comments=0 ---the "undefined" there ought to be "11717".)
  • (Update 2: It seems to have something to do with math in the comment thread title---see the test comment I made to this post, titled $X × X$.)
#3: Post edited by user avatar clemens‭ · 2026-04-01T18:01:04Z (6 months ago)
  • [This answer](https://math.codidact.com/posts/295855/295859#answer-295859) has one comment, $X\times X \cong X$. But when I attempt to click on the comment to show it, it leads to a 404 page.
  • Why is this? Was the comment deleted? If so, why does it still appear?
  • (Update: the comment is not deleted but accessible at https://math.codidact.com/comments/thread/11717. One can access it by Ctrl-clicking to open it in a new tab. The problem is that some JavaScript function in Codidact is returning "undefined" as the comment thread number and so the Codidact website makes an XHR request to https://math.codidact.com/comments/thread/undefined/content?inline=true&show_deleted_comments=0 ---the "undefined" there ought to be "11717".)
  • [This answer](https://math.codidact.com/posts/295855/295859#answer-295859) has one comment, $X\times X \cong X$. But when I attempt to click on the comment to show it, it leads to a 404 page.
  • Why is this?
  • (Update: the comment is not deleted as I had previously thought; it is accessible at https://math.codidact.com/comments/thread/11717 , and one can access it by Ctrl-clicking to open it in a new tab. The problem is that some JavaScript function in Codidact is returning "undefined" as the comment thread number and so the Codidact website makes an XHR request to https://math.codidact.com/comments/thread/undefined/content?inline=true&show_deleted_comments=0 ---the "undefined" there ought to be "11717".)
#2: Post edited by user avatar clemens‭ · 2026-04-01T18:00:31Z (6 months ago)
Added more info about the bug
  • [This answer](https://math.codidact.com/posts/295855/295859#answer-295859) has one comment, $X\times X \cong X$. But when I attempt to click on the comment to show it, it leads to a 404 page.
  • Why is this? Was the comment deleted? If so, why does it still appear?
  • [This answer](https://math.codidact.com/posts/295855/295859#answer-295859) has one comment, $X\times X \cong X$. But when I attempt to click on the comment to show it, it leads to a 404 page.
  • Why is this? Was the comment deleted? If so, why does it still appear?
  • (Update: the comment is not deleted but accessible at https://math.codidact.com/comments/thread/11717. One can access it by Ctrl-clicking to open it in a new tab. The problem is that some JavaScript function in Codidact is returning "undefined" as the comment thread number and so the Codidact website makes an XHR request to https://math.codidact.com/comments/thread/undefined/content?inline=true&show_deleted_comments=0 ---the "undefined" there ought to be "11717".)
#1: Initial revision by user avatar clemens‭ · 2026-04-01T17:30:57Z (6 months ago) 
Comment thread leads to "404 Not Found" error page
[This answer](https://math.codidact.com/posts/295855/295859#answer-295859) has one comment, $X\times X \cong X$. But when I attempt to click on the comment to show it, it leads to a 404 page. 

Why is this? Was the comment deleted? If so, why does it still appear?
bug