大约有 40,000 项符合查询结果（耗时：0.0456秒） [XML]
href image link download on click
..."/path/to/image"><img src="/path/to/image" /></a> in a web app.
10 Answers
...
What is the most efficient way to store a list in the Django models?
...the root of all evil."
With that firmly in mind, let's do this! Once your apps hit a certain point, denormalizing data is very common. Done correctly, it can save numerous expensive database lookups at the cost of a little more housekeeping.
To return a list of friend names we'll need to create a ...
In a Django form, how do I make a field readonly (or disabled) so that it cannot be edited?
...ng get_readonly_fields.
Usually you should declare something like this in app/admin.py:
class ItemAdmin(admin.ModelAdmin):
...
readonly_fields = ('url',)
I've adapted in this way:
# In the admin.py file
class ItemAdmin(admin.ModelAdmin):
...
def get_readonly_fields(self, request...
getting the screen density programmatically in android?
...ources().getDisplayMetrics();
Though Android doesn't use a direct pixel mapping, it uses a handful of quantized Density Independent Pixel values then scales to the actual screen size. So the metrics.densityDpi property will be one of the DENSITY_xxx constants (120, 160, 213, 240, 320, 480 or 640 d...
py2exe - generate single executable file
...t release (1.3) is somewhat outdated. It's been working really well for an app which depends on PyQt, PyQwt, numpy, scipy and a few more.
share
|
improve this answer
|
follow...
When is a C++ destructor called?
...te an item in the (previously) unused part of its memory space.
Now, what happens when/if you erase an item from the vector? It can't just use delete -- that would release its entire block of memory; it needs to destroy one object in that memory without destroying any others, or releasing any of the...
About catching ANY exception
...hat being said, it's good to track down as many as you can and handle them appropriately and then have a backup catch all for the ones you miss.
– Blaze
Oct 19 '15 at 8:04
28
...
AngularJS Directive Restrict A vs E
...ng comment on pitfalls for a complete answer:
Assuming you're building an app that should run on Internet Explorer <= 8, whom support has been dropped by AngularJS team from AngularJS 1.3, you have to follow the following instructions in order to make it working: https://docs.angularjs.org/guide...
How do I use Ruby for shell scripting?
...h()
For file system operations I almost always use Pathname. This is a wrapper for many of the other file system related classes. Also useful: Dir, File...
share
|
improve this answer
|
...
Using the “animated circle” in an ImageView while loading stuff
I am currently using in my application a listview that need maybe one second to be displayed.
6 Answers
...