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django admin - add custom form fields that are not part of the model

I have a model registered in the admin site. One of its fields is a long string expression. I'd like to add custom form fields to the add/update page of this model in the admin that based on these fields values I will build the long string expression and save it in the relevant model field. ...
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Javascript seconds to minutes and seconds

...ng code to pretty-print the time (suggested by Dru) function str_pad_left(string,pad,length) { return (new Array(length+1).join(pad)+string).slice(-length); } var finalTime = str_pad_left(minutes,'0',2)+':'+str_pad_left(seconds,'0',2); ...
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Should I use encodeURI or encodeURIComponent for encoding URLs?

...cial meaning, so you use it for components of URIs such as var world = "A string with symbols & characters that have special meaning?"; var uri = 'http://example.com/foo?hello=' + encodeURIComponent(world); share ...
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What's a good hex editor/viewer for the Mac? [closed]

... Mac - Synalyze It!. It costs 7 € / 40 € (Pro version) and offers some extra features like histogram, incremental search, support of many text encodings and interactive definition of a "grammar" for your file format. The grammar helps to interpret the files and colors the hex view for easier an...
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What's the best way to check if a String represents an integer in Java?

I normally use the following idiom to check if a String can be converted to an integer. 38 Answers ...
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What is the point of function pointers?

...orithm, but also data: class functor { public: functor(const std::string& prompt) : prompt_(prompt) {} void operator()(int i) {std::cout << prompt_ << i << '\n';} private: std::string prompt_; }; functor f("the answer is: "); f(42); Another advantage is ...
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Split string, convert ToList() in one line

I have a string that has numbers 10 Answers 10 ...
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What is a lambda expression in C++11?

...n false ; return true ; }()) // i is all whitespace, assuming i is an std::string – Blacklight Shining Mar 2 '13 at 1:13 ...
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const char *, char const *, char * const 异同?const修饰符各位置有何区...

const char * p = new char('a'); 这个是常字符,即p的内容不能被修改。 char const * p 意义同上,没有区别。 这时,*p = 'c'; 会报错。 char * const p = new char('a'); 这个是常指针,即p指针本身不可被修改。 这时,p = new char; 会报...
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What is the difference between char * const and const char *?

... The difference is that const char * is a pointer to a const char, while char * const is a constant pointer to a char. The first, the value being pointed to can't be changed but the pointer can be. The second, the value being pointed at can change but t...