I have the following HTML node structure:
<
-
Try this for immediate child elements of type div
$("#foo > div")[0].children.length
讨论(0)
-
In response to mrCoders answer using jsperf why not just use the dom node ?
var $foo = $('#foo');
var count = $foo[0].childElementCount
You can try the test here: http://jsperf.com/jquery-child-ele-size/7
This method gets 46,095 op/s while the other methods at best 2000 op/s
讨论(0)
-
$("#foo > div")
selects all divs that are immediate descendants of #foo
once you have the set of children you can either use the size function:
$("#foo > div").size()
or you can use
$("#foo > div").length
Both will return you the same result
讨论(0)
-
var divss = 0;
$(function(){
$("#foo div").each(function(){
divss++;
});
console.log(divss);
});
<div id="foo">
<div id="bar" class="1"></div>
<div id="baz" class="1"></div>
<div id="bam" class="1"></div>
</div>
讨论(0)
-
I recommend using $('#foo').children().size()
for better performance.
I've created a jsperf test to see the speed difference and the children()
method beaten the child selector (#foo > div) approach by at least 60% in Chrome (canary build v15) 20-30% in Firefox (v4).
By the way, needless to say, these two approaches produce same results (in this case, 1000).
[Update] I've updated the test to include the size() vs length test, and they doesn't make much difference (result: length
usage is slightly faster (2%) than size()
)
[Update] Due to the incorrect markup seen in the OP (before 'markup validated' update by me), both $("#foo > div").length
& $('#foo').children().length
resulted the same (jsfiddle). But for correct answer to get ONLY 'div' children, one SHOULD use child selector for correct & better performance
讨论(0)
-
var n_numTabs = $("#superpics div").size();
or
var n_numTabs = $("#superpics div").length;
As was already said, both return the same result.
But the size() function is more jQuery "P.C".
I had a similar problem with my page.
For now on, just omit the > and it should work fine.
讨论(0)
- 热议问题