大约有 44,000 项符合查询结果（耗时：0.0765秒） [XML]
How do I make a transparent canvas in html5?
...und on mobile so layering canvases doesn't work there. (At least on Chrome for Android)
– nicholeous
Jul 6 '15 at 23:25
...
Unique BooleanField value in Django?
...needed to accomplish this task, what I've done is override the save method for the model and have it check if any other model has the flag already set (and turn it off).
class Character(models.Model):
name = models.CharField(max_length=255)
is_the_chosen_one = models.BooleanField()
def...
Building executable jar with maven?
I am trying to generate an executable jar for a small home project called "logmanager" using maven, just like this:
4 Answe...
Specify width in *characters*
...
1em is the height of an M, rather than the width. Same holds for ex, which is the height of an x. More generally speaking, these are the heights of uppercase and lowercase letters.
Width is a totally different issue....
Change your example above to
<div>
<span>1<...
Best way to check if a Data Table has a null value in it
...Value value to filter and manage null values in whatever way you see fit.
foreach(DataRow row in table.Rows)
{
object value = row["ColumnName"];
if (value == DBNull.Value)
// do something
else
// do something else
}
More information about the DBNull class
If you wan...
Laravel orderBy on a relationship
...
Someone already suggested this on the Laravel Forum, but I want to be able to do this in the Controller so that I can choose which field to sortby based on user input. May be I should I have made this clearer in the question.
– PrestonDocks
...
In ASP.NET, when should I use Session.Clear() rather than Session.Abandon()?
...specific session and the user will get a new session key. You could use it for example when the user logs out.
Use Session.Clear(), if you want that the user remaining in the same session (if you don't want the user to relogin for example) and reset all the session specific data.
...
git - Find commit where file was added
...ff-filter=A -- foo.js
Check the documentation. You can do the same thing for Deleted, Modified, etc.
https://git-scm.com/docs/git-log#Documentation/git-log.txt---diff-filterACDMRTUXB82308203
I have a handy alias for this, because I always forget it:
git config --global alias.whatadded 'log --di...
What does git rev-parse do?
...
git rev-parse is an ancillary plumbing command primarily used for manipulation.
One common usage of git rev-parse is to print the SHA1 hashes given a revision specifier. In addition, it has various options to format this output such as --short for printing a shorter unique SHA1.
There...
How to display full (non-truncated) dataframe information in html when converting from pandas datafr
...h option to -1:
pd.set_option('display.max_colwidth', -1)
set_option docs
For example, in iPython, we see that the information is truncated to 50 characters. Anything in excess is ellipsized:
If you set the display.max_colwidth option, the information will be displayed fully:
...