如何检查是否存在至少一个带attr = something的li元素？

Question

So I want to check if there is any li element that has a attribute of "data-foo" and its value is "bar".

Would this work? :

if ($('li[data-foo=bar]'))
{
//exists
}
else
{
//does not exist
}

Thanks

Answer 1

Get length of elements retured by selector if it is greater then zero then it means you have atleast one element with provided condition in selector.

if ($('li[data-foo=bar]').length > 0)
{
//exists
}
else
{
//does not exist
}