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Popup弹出菜单扩展 · App Inventor 2 中文网
...AutoCheck，Checked是当前的新的选中状态。
为了节省大量的if... else if... else块，前五个菜单项的点击事件作为单独的事件可用。MenuItemSelected在MenuItemSelected之前触发。
属性
锚点组件
指定弹出菜单显示在其下...
Why 0 is true but false is 1 in the shell?
...ntion, but a particularly useful one when you think about it. In general, if a program succeeds that's all you need to know. If it fails, however, you might need to know all kinds of information about the failure - why it happened, how to fix it, etc. Having zero mean 'success' and non-zero mean f...
What is Java String interning?
...gs will ensure that all strings having same contents share same memory. So if you have list of names where 'john' appears 1000 times, by interning you ensure only one 'john' is actually allocated memory.
This can be useful to reduce memory requirements of your program. But be aware that the cache i...
Any way to Invoke a private method?
...
You can invoke private method with reflection. Modifying the last bit of the posted code:
Method method = object.getClass().getDeclaredMethod(methodName);
method.setAccessible(true);
Object r = method.invoke(object);
There are a couple of caveats. First, getDeclaredMethod...
How do you read from stdin?
...t():
pass
fileinput will loop through all the lines in the input specified as file names given in command-line arguments, or the standard input if no arguments are provided.
Note: line will contain a trailing newline; to remove it use line.rstrip()
...
Tracking Google Analytics Page Views with AngularJS
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If you're using ng-view in your Angular app you can listen for the $viewContentLoaded event and push a tracking event to Google Analytics.
Assuming you've set up your tracking code in your main index.html file with a name of...
How to stop event propagation with inline onclick attribute?
...fox, Safari, IE9+)
The window.event object in Internet Explorer (<=8)
If you need to support legacy browsers that don't follow the W3C recommendations, generally inside a function you would use something like the following:
function(e) {
var event = e || window.event;
[...];
}
which woul...
How to check null objects in jQuery
...e the length property of the jQuery collection returned by your selector:
if ( $('#myDiv').length ){}
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SQL update trigger only when column is modified
...t it doesn't seem to work as I would like: I want it to only update the modified information if the QtyToRepair value has been updated... but it doesn't do that.
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Automatic exit from bash shell script on error [duplicate]
I've been writing some shell script and I would find it useful if there was the ability to halt the execution of said shell script if any of the commands failed. See below for an example:
...