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Replace selector images programmatically
...that has a drawable image resource set to a selector. How do I programmatically access the selector and change the images of the highlighted and non-highlighted state?
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How do you know a variable type in java?
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I just figured that was what the OP was really looking for since the declaration of a is pretty obvious at compile time
– Martin
Apr 20 '10 at 11:22
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Django Forms: if not valid, show form with error message
...ee. I return the same form that I got in. The error messages have automatically been added to it by the is_valid() function.
– user984003
Feb 1 '13 at 13:57
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“ValueError: zero length field name in format” error in Python 3.0,3.1,3.2
... it! Had to change my shebangs to: #! /usr/local/bin/python3 after looking all over. There is 3 different locations of python installs on Mac -_- wtf.
– Oscar Godson
Mar 27 '11 at 4:16
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How to delay the .keyup() handler until the user stops typing?
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I use this small function for the same purpose, executing a function after the user has stopped typing for a specified amount of time or in events that fire at a high rate, like resize:
function delay(callback, ms) {
var timer = 0;
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Mongoose's find method with $or condition does not work properly
...everyone to use Mongoose's query builder language and promises instead of callbacks:
User.find().or([{ name: param }, { nickname: param }])
.then(users => { /*logic here*/ })
.catch(error => { /*error logic here*/ })
Read more about Mongoose Queries.
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How to enable C++11 in Qt Creator?
...The problem was, I wasn't able to delete your duplicate/incomplete answer, all I could do was to downvote it. Now that you have edited it to make it more presentable, I am happy with just the downvote.
– nurettin
Aug 21 '14 at 12:55
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Setting JDK in Eclipse
...f available compilers in the Window -> Preferences -> Java -> Installed JRE's tab.
In the project build path configuration dialog, under the libraries tab, you can delete the entry for JRE System Library, click on Add Library and choose the installed JRE to compile with. Some compilers ca...
Specifying and saving a figure with exact size in pixels
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plt.figure(figsize=(800/my_dpi, 800/my_dpi), dpi=my_dpi)
So you basically just divide the dimensions in inches by your DPI.
If you want to save a figure of a specific size, then it is a different matter. Screen DPIs are not so important anymore (unless you ask for a figure that won't fit in ...
Most efficient way to concatenate strings?
...o" + var1 + "bar" + var2 + "hello" + var3 + "world", the compiler automatically turns that into a string.concat call, which is as efficient as it gets. This answer is incorrect, there are plenty of better answers to choose from
– csauve
Jan 12 '11 at 17:56
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