大约有 40,000 项符合查询结果（耗时：0.0744秒） [XML]
Regex empty string or email
...
If you are using it within rails - activerecord validation you can set
allow_blank: true
As:
validates :email, allow_blank: true, format: { with: EMAIL_REGEX }
share
|
improve this answe...
Need for predictable random generator
...boundary probabilities. For instance, for a probability of 20%, you could set 10% as a lower bound and 40% as an upper bound.
Using those bounds, I found that with runs of 10 hits, 14.2% of the time the true pseudorandom implementation produced results that were out of those bounds. About 11% of ...
How can I handle time zones in my webapp?
...
As for displaying them, it would make sense to take the device's timezone setting and use that as the current timezone. That said, there should be a timezone dropdown next to the "time input" box, which defaults to the device's current timezone, so the user can change it if needed.
The majority of...
What does $$ mean in the shell?
...
Or the person who asked the question should set the higher rated answer below as the accepted answer...
– jtimberman
Sep 19 '08 at 17:31
7
...
Format JavaScript date as yyyy-mm-dd
....
Edit: @exbuddha wrote this to handle time zone in the comments:
const offset = yourDate.getTimezoneOffset()
yourDate = new Date(yourDate.getTime() + (offset*60*1000))
return yourDate.toISOString().split('T')[0]
share
...
Transaction marked as rollback only: How do I find the cause
...s stored in a thread local variable.When the spring intercepts methodC and sets the flag as rollback , your transaction is already marked for roll back. Any further suppression of exception will not help because when the final commit happens , you will get the error
– lives
...
How do HttpOnly cookies work with AJAX requests?
...cookies that are used for purposes other than authentication, these can be set without the HTTP only flag, if you want script to be able to modify or read these. You can pick and choose which cookies should be HTTP only, so for example anything non-sensitive like UI preferences (sort order, collaps...
Changing Java Date one hour back
...stance();
// remove next line if you're always using the current time.
cal.setTime(currentDate);
cal.add(Calendar.HOUR, -1);
Date oneHourBack = cal.getTime();
java.util.Date
new Date(System.currentTimeMillis() - 3600 * 1000);
org.joda.time.LocalDateTime
new LocalDateTime().minusHours(1)
Java...
Core Data: Quickest way to delete all instances of an entity
...em all:
NSFetchRequest *allCars = [[NSFetchRequest alloc] init];
[allCars setEntity:[NSEntityDescription entityForName:@"Car" inManagedObjectContext:myContext]];
[allCars setIncludesPropertyValues:NO]; //only fetch the managedObjectID
NSError *error = nil;
NSArray *cars = [myContext executeFetchRe...
Where do I find the line number in the Xcode editor?
...nt cursor location was displayed. I don't see this in Xcode 4. Is there a setting that will turn it on? Or a keypress that will give it to me?
...