大约有 44,000 项符合查询结果（耗时：0.0715秒） [XML]
How do I check how many options there are in a dropdown menu?
...
for the length of selected options is this correct "$('.search-select option:selected').length"
– Youssef Boudaya
Jun 12 '19 at 11:00
...
How can I check if a checkbox is checked?
...;
} else {
alert("You didn't check it! Let me check it for you.");
}
}
</script>
share
|
improve this answer
|
follow
...
Fragment onCreateView and onActivityCreated called twice
...
I was scratching my head about this for a while too, and since Dave's explanation is a little hard to understand I'll post my (apparently working) code:
private class TabListener<T extends Fragment> implements ActionBar.TabListener {
private Fragment...
sqlalchemy: how to join several tables by one query?
...
A good style would be to setup some relations and a primary key for permissions (actually, usually it is good style to setup integer primary keys for everything, but whatever):
class User(Base):
__tablename__ = 'users'
email = Column(String, primary_key=True)
name = Column(St...
“Keep Me Logged In” - the best approach
My web application uses sessions to store information about the user once they've logged in, and to maintain that information as they travel from page to page within the app. In this specific application, I'm storing the user_id , first_name and last_name of the person.
...
How many concurrent AJAX (XmlHttpRequest) requests are allowed in popular browsers?
... Wow. This is a good trick. This also explains why tile-servers for map engines create a number of fake sub-domains (typically something like maps1.whatever.com, maps2.whatever.com, maps3.whatever.com) to accelerate things.
– meawoppl
May 23 '13 at 1...
How can I select rows with most recent timestamp for each key value?
...amp, and other fields. I want to select a single row with latest timestamp for each sensor, including some of the other fields.
...
Deep copy of a dict in python
I would like to make a deep copy of a dict in python. Unfortunately the .deepcopy() method doesn't exist for the dict . How do I do that?
...
There is already an open DataReader associated with this Command which must be closed first
...
This worked for me. If you want to read more about Enabling Multiple Active Result Sets (MARS) see msdn.microsoft.com/en-us/library/h32h3abf(v=vs.100).aspx. Consider reading up on Disadvantages of MARS too stackoverflow.com/questions/374...
How to list all users in a Linux group?
...
Unfortunately, there is no good, portable way to do this that I know of. If you attempt to parse /etc/group, as others are suggesting, you will miss users who have that group as their primary group and anyone who has been adde...