bug#69132: [ELPA] Remove jQuery from elpa.gnu.org

[Philip Kaludercic <philipk@posteo.net>]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>> I was recently surprised to see that elpa.gnu.org uses a jQuery library,
>> where it really isn't necessary.  Re-implementing the same functionality
>> can be done in a few more lines of plain Javascript, without the need
>> for any minified code.  Tested with relatively recent versions of
>> Firefox and Chromium, so perhaps it would be nice if someone with an
>> older browser could check if I didn't make any bold assumptions. 
>
> Works for me, but I'm not using an "older browser" 🙁

I have a few older machines that I could try it out on.

>> diff --git a/html/javascript/package-search.js b/html/javascript/package-search.js
>> index 47134045eb..92f29703a3 100644
>> --- a/html/javascript/package-search.js
>> +++ b/html/javascript/package-search.js
>> @@ -1,6 +1,35 @@
>> -$(document).ready(function() {
>> -	$('table').filterTable({
>> -		label: '',
>> -		placeholder: 'Search packages...'
>> -	});
>> +window.addEventListener("load", function (event) {
>> +	const table = document.getElementById("packages");
>> +
>> +	const search = document.createElement("input");
>> +	search.setAttribute("placeholder", "Search packages...");
>> +	search.setAttribute("type", "search");
> [...]
>
> I know very little about Javascript, but I'm curious: can't we add the
> `input` element directly in the HTML file, and skip those first 4 lines or so?

Of course, I just replicated what the jquery plugin did.  I suppose the
idea was to not have a broken search field labelled "Search
packages...", if there is no Javascript to make it work in the first
place.

>> diff --git a/html/layout.css b/html/layout.css
>> index 4f5c50d393..434220f8c1 100644
>> --- a/html/layout.css
>> +++ b/html/layout.css
>
> A rationale/description of this part of the change would be welcome.
>
>> From 73a9335634f54b71e9723047f327cf782cfb7244 Mon Sep 17 00:00:00 2001
>> From: Philip Kaludercic <philipk@posteo.net>
>> Date: Wed, 14 Feb 2024 20:37:37 +0100
>> Subject: [PATCH] Update HTML generation for new filter implementation
>>
>> ---
>>  elpa-admin.el | 27 +++++++++++----------------
>>  1 file changed, 11 insertions(+), 16 deletions(-)
>
> Same here.

The idea is just to not use CSS classes to pinpoint specific Elements in
the DOM.  That is what IDs are for (ideally the "ID -> elements" map
should be injective).  I needed that to use document.getElementById in
the new script.

Should I update the commit messages to explain the change?

>
>         Stefan