Ticket #4344 (closed bug: wontfix)
~, > selector with descendant fails
| Reported by: | kbae | Owned by: | john |
|---|---|---|---|
| Priority: | high | Milestone: | 1.next |
| Component: | selector | Version: | 1.4.4 |
| Keywords: | regression | Cc: | |
| Blocking: | Blocked by: |
Description
Using ~ or > selector in combination with a descendant fails in 1.3.2, but works in 1.2.x.
Example: $(' ~ tr.clsName .subClsName', obj)
See attached sample.
Change History
comment:1 Changed 4 years ago by davidserduke
Seems to work in the most recent versions of the browser that have the querySelectorAll() functionality. But in versions without that I think it is a Sizzle problem. So this problem shows in FF3.5 only if you hide the querySelectorAll().
<!DOCTYPE html>
<html>
<head>
<title>Tester</title>
<script type="text/javascript" src="../jquery.js"></script>
<script type="text/javascript">
$(function () {
document.querySelectorAll = undefined;
var $result = $("body > div span");
alert($result.length ? "found" : "not found");
});
</script>
</head>
<body>
<div id="outside_div">
<div id="inside_div">
<span>Howdy</span>
</div>
</div>
</body>
</html>
Near as I can tell (at least in this case) Sizzle works backwards on the query. So with this query:
$("body > div span");
it finds the span first. Then it looks for the nearest div parent which in this case is inside_div. Next it looks to see if body is the direct parent of inside_div which it is not and fails to make a successful connection on that basis.
I suspect to fix this Sizzle would have to keep an array of matching parents found instead of just the closest parent. Then loop over those for the various cases because sometimes you want the closest but others you might not.
All in all doesn't seem like an easy fix.
comment:2 Changed 3 years ago by rwaldron
- Priority changed from minor to high
- Status changed from new to open
- Version changed from 1.3.2 to 1.4.3
- Milestone changed from 1.4 to 1.4.4
Confirmed;
"Not Found" when using 1.4.4rc1: http://jsfiddle.net/rwaldron/SKhr8/3/
"Found" with 1.2.6 http://jsfiddle.net/rwaldron/SKhr8/4/
"Note Found" with 1.3.2 http://jsfiddle.net/rwaldron/SKhr8/5/
Incidentally, I would suspect that qSA does not like mixed descendant selectors
comment:3 Changed 3 years ago by snover
- Keywords regression added
- Milestone changed from 1.4.4 to 1.4.5
comment:4 Changed 2 years ago by jitter
- Version changed from 1.4.3 to 1.4.4
- Milestone changed from 1.4.5 to 1.next
comment:7 Changed 23 months ago by john
- Status changed from open to closed
- Resolution set to wontfix
This does not seem like something that we're going to fix - the result would be prohibitively expensive (both in terms of computation and in terms of file size). Perhaps if we end up rewriting Sizzle at some point we can tackle this issue then.
For this specific case you can do: $("body > div").find("span") to achieve a working result.
Please follow the bug reporting guidlines and use jsFiddle when providing test cases and demonstrations instead of pasting the code in the ticket.