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query by id - ignore context
Will not implement
- Maybe later
- Under review
- In-progress
- Implemented
- Will not implement
in Developing jQuery Core
•
12 years ago
When selecting elements jQuery provides an optional 2nd argument (context) which limits the search to a specific node. Adding this argument usually speeds up queries, but when the query is by id adding the context actually siginificantly slows down the query.
As a test, go here:
and run this script in Firebug:
- console.time("1");
- for(var i=0; i<2000; i++) {
- $("#jq-intro");
- }
- console.timeEnd("1");
- console.time("2");
- for(var i=0; i<2000; i++) {
- $("#jq-content");
- $("#jq-intro");
- }
- console.timeEnd("2");
- console.time("3");
- for(var i=0; i<2000; i++) {
- $("#jq-intro", $("#jq-content"));
- }
- console.timeEnd("3");
On my slow test computer I see the following results:
1: 53ms
2: 103ms
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