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Use Font Awesome Icon in Placeholder
...tAwesome;
font-style: normal;
font-weight: normal;
text-decoration: inherit;
}
And this (simple) jQuery
$('#iconified').on('keyup', function() {
var input = $(this);
if(input.val().length === 0) {
input.addClass('empty');
} else {
input.removeClass('empty')...
App Inventor 2 能否实现后台推送通知？源码级深度调研 - App应用开发 - 清...
...即使未打开）
关键特征：
1. 操作系统级别：由 Android/iOS 系统进程接收，不需要 App 运行
2. 持久连接：手机系统与推送服务器保持长连接（不是 App 自己的连接）
3. 省电：所有 App 共享同一条系统级连接
4. 可靠性高：操作...
live output from subprocess command
...s a driver for a hydrodynamics code. When it comes time to run the simulation, I use subprocess.Popen to run the code, collect the output from stdout and stderr into a subprocess.PIPE --- then I can print (and save to a log-file) the output information, and check for any errors. The problem is...
How do I check if a column is empty or null in MySQL?
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If you change the condition to WHERE some_col IS NULL OR some_col = ' ' (one space inserted in the string) then it works on both MySQL and Oracle, see answer of "onedaywhen". some_col = '' doesn't work on Oracle as empty strings mean NULL there.
...
What languages are Windows, Mac OS X and Linux written in?
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Windows: C++, kernel is in C
Mac: Objective C, kernel is in C (IO PnP subsystem is Embedded C++)
Linux: Most things are in C, many userland apps are in Python, KDE is all C++
All kernels will use some assembly code as well.
...
Javascript: negative lookbehind equivalent?
...eve the equivalent of a negative lookbehind in javascript regular expressions? I need to match a string that does not start with a specific set of characters.
...
Xcode 4.2 - declaration of '…' will not be visible outside of this function warning
... #import will prevent a header from being brought into a compilation unit twice. #include will allow it (and then guard macros are used to prevent duplicate symbols.) There are some headers that expect to be brought in twice.
– Jonathan Grynspan
Jul 1...
Programmatically align a toolbar on top of the iPhone keyboard
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As of iOS 3.2 there's a new way to achieve this effect:
UITextFields and UITextViews have an inputAccessoryView property, which you can set to any view, that is automatically displayed above and animated with the keyboard.
Note t...
Android: Difference between Parcelable and Serializable?
...ce and add override methods. The problem with this approach is that reflection is used and it is a slow process. This method creates a lot of temporary objects and causes quite a bit of garbage collection. However, Serializable interface is easier to implement.
Look at the example below (Serializab...
Xcode 6 Bug: Unknown class in Interface Builder file
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I resolved this issue as I was typing the question. I figured I'd answer my question and leave it here for anyone else who may face this issue when using Xcode 6 beta 4.
To resolve this issue, you need to select each of your custom class objects in Storyboard (this inclu...