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How to have jQuery restrict file types on upload?
...ad field to only jpg/jpeg, png, and gif. I am doing backend checking with PHP already. I am running my submit button through a JavaScript function already so I really just need to know how to check for the file types before submit or alert.
...
What is the main difference between PATCH and PUT request?
...ates a new record in database.
Example: Use POST method to save new user, order etc where backend server decides the resource id for new resource.
PUT
In HTTP.PUT method the resource is first identified from the URL and if it exists then it is updated otherwise a new resource is created. When the...
Which browsers support ?
...them closely on this, and it should come out soon (I hope!).
More info on ordered-async (aka, "async=false") can be found here: http://wiki.whatwg.org/wiki/Dynamic_Script_Execution_Order
Also, to test if a browser supports the new dynamic async property behavior: http://test.getify.com/test-async/...
What is the difference between Class Path and Build Path
... these classes.
The virtual machine searches for and loads classes in this order:
bootstrap classes: the classes that are fundamental to the Java
Platform (comprising the public classes of the Java Class Library, and
the private classes that are necessary for this library to be
functional).
extensio...
Does using “new” on a struct allocate it on the heap or stack?
...hen you create an instance of a class with the new operator, memory gets allocated on the heap. When you create an instance of a struct with the new operator where does the memory get allocated, on the heap or on the stack ?
...
Append an object to a list in R in amortized constant time, O(1)?
...irthday. Some kind readers keep repeating any shortcomings with it, so by all means also see some of the comments below. One suggestion for list types:
newlist <- list(oldlist, list(someobj))
In general, R types can make it hard to have one and just one idiom for all types and uses.
...
Placing/Overlapping(z-index) a view above another view in android
...you can use a FrameLayout. In a FrameLayout, the z-index is defined by the order in which the items are added, for example:
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
&l...
Which Architecture patterns are used on Android? [closed]
...ment, check out this comprehensive course here.
This answer was updated in order to remain relevant as of November 2016
It looks like you are seeking for architectural patterns rather than design patterns.
Design patterns aim at describing a general "trick" that programmer might implement for handl...
#define macro for debug printing in C?
.... } while (0) idiom ensures that the code acts like a statement (function call). The unconditional use of the code ensures that the compiler always checks that your debug code is valid — but the optimizer will remove the code when DEBUG is 0.
If you want to work with #ifdef DEBUG, then change th...
Mac OSX Lion DNS lookup order [closed]
After upgrading to Mac OSX Lion I figured out that /etc/hosts is not looked up in first place for name resolution anymore. This leads to some side effects like:
...