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Extension · App Inventor 2 中文网
...ives the url which started this activity/screen if there is any else empty string
Methods
GetStartUrl()
Returns the url which started the current activity
ClientSocketAI2Ext
TCP Socket 客户端扩展。
该组件用于主动连接...
How to store arrays in MySQL?
...u'll want to use JSON_ARRAYAGG, rather than hack the array together from a string.
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How do I log a Python error with debug information?
... problem is that traceback lines could have \n inside, so we need to do an extra work to get rid of this line endings:
import logging
logger = logging.getLogger('your_logger_here')
def log_app_error(e: BaseException, level=logging.ERROR) -> None:
e_traceback = traceback.format_exception(e...
Can I change multiplier property for NSLayoutConstraint?
...NSLayoutConstraint to respond for bounds change or device rotation without extra code.
– tzaloga
Jul 5 '16 at 14:40
...
@RequestBody and @ResponseBody annotations in Spring
...abbits");
}
// domain / value objects
public class UserStats{
private String firstName;
private String lastName;
// + getters, setters
}
public class Description{
private String description;
// + getters, setters, constructor
}
Now if you have Jackson on your classpath (and ha...
How to perform a real time search and filter on a HTML table
... this approach because it is quite resource consuming. Put all the refined strings into an array of objects with two fields: a reference to the <tr> DOMElement and the string. This way, on keyup() you search those strings (which is way faster) and have the corresponding rows ready to be manipu...
How to strike through obliquely with css
...e a border, then rotate it with a CSS transform. Doing it this way adds no extra elements to the DOM, and adding/removing the strikethrough is a simple as adding/removing the class.
Here's a demo
Caveats
This will only work down to IE8. IE7 does not support :before, however will degrade graceful...
Select Last Row in the Table
...derBy(id', 'desc')->first(); Order by date works longer because date is string and most likely not indexed. While primary key is indexed and works super fast. Even if created_at indexed, it is indexed string and not INT in case of primary. Index string has less performance.
–...
Restoring state of TextView after screen rotation?
... @Gautam my guess would be that often TextViews are built from static strings stored in XML, in which case it's redundant for the system to remember the values.
– anderspitman
Jul 31 '14 at 1:24
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differentiate null=True, blank=True in django
...ngo are never saved as NULL. Blank values are stored in the DB as an empty string ('').
A few examples:
models.DateTimeField(blank=True) # raises IntegrityError if blank
models.DateTimeField(null=True) # NULL allowed, but must be filled out in a form
Obviously, Those two options don't make logi...