大约有 45,668 项符合查询结果（耗时：0.0342秒） [XML]
Django: multiple models in one template using forms [closed]
...
This really isn't too hard to implement with ModelForms. So lets say you have Forms A, B, and C. You print out each of the forms and the page and now you need to handle the POST.
if request.POST():
a_valid = formA.is_valid()
b_valid = formB.is_valid()
c...
Proper way to exit iPhone application?
I am programming an iPhone app, and I need to force it to exit due to certain user actions. After cleaning up memory the app allocated, what's the appropriate method to call to terminate the application?
...
JavaScript open in a new window, not tab
I have a select box that calls window.open(url) when an item is selected. Firefox will open the page in a new tab by default. However, I would like the page to open in a new window, not a new tab.
...
Why is it faster to check if dictionary contains the key, rather than catch the exception in case it
...to be unwound etc.
On the other hand, accessing a value in a dictionary by its key is cheap, because it's a fast, O(1) operation.
BTW: The correct way to do this is to use TryGetValue
obj item;
if(!dict.TryGetValue(name, out item))
return null;
return item;
This accesses the dictionary only ...
How do I connect to this localhost from another computer on the same network?
I'm currently working on a project and I would like to test it out on two laptops at home where one laptop connects to the localhost on the other. I am using XAMPP. How do I do this?
...
How to search contents of multiple pdf files?
...les in a directory/subdirectory? I am looking for some command line tools. It seems that grep can't search PDF files.
13 ...
Why shouldn't Java enum literals be able to have generic type parameters?
Java enums are great. So are generics. Of course we all know the limitations of the latter because of type erasure. But there is one thing I don't understand, Why can't I create an enum like this:
...
How do I create an average from a Ruby array?
...r.inject(0.0) { |sum, el| sum + el } / arr.size
=> 6.5
You can define it as part of Array as another commenter has suggested, but you need to avoid integer division or your results will be wrong. Also, this isn't generally applicable to every possible element type (obviously, an average only ma...
Split string to equal length substrings in Java
How to split the string "Thequickbrownfoxjumps" to substrings of equal size in Java.
Eg. "Thequickbrownfoxjumps" of 4 equal size should give the output.
...
Bomb dropping algorithm
...s to a simple sub-problem.
There are 2 parts to the explanation, the algorithm, and the reason the algorithm
provides an optimal solution. The first won't make sense without the second, so I'll
start with the why.
If you think of bombing the rectangle (assume a big rectangle - no edge cases yet...