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JQuery: 'Uncaught TypeError: Illegal invocation' at ajax request - several elements

...er correct entries). So, instead of: var data = { 'mode': 'filter_city', 'id_A': e[e.selectedIndex] }; it should be: var data = { 'mode': 'filter_city', 'id_A': e[e.selectedIndex].value }; Note: check Jason Kulatunga's answer, it quotes JQuery doc to explain wh...
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filter for complete cases in data.frame using dplyr (case-wise deletion)

...data.frame for complete cases using dplyr? complete.cases with a list of all variables works, of course. But that is a) verbose when there are a lot of variables and b) impossible when the variable names are not known (e.g. in a function that processes any data.frame). ...
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What does `unsigned` in MySQL mean and when to use it?

... MySQL says: All integer types can have an optional (nonstandard) attribute UNSIGNED. Unsigned type can be used to permit only nonnegative numbers in a column or when you need a larger upper numeric range for the column. For e...
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How to send HTML-formatted email? [duplicate]

... Setting isBodyHtml to true allows you to use HTML tags in the message body: msg = new MailMessage("xxxx@gmail.com", "yyyy@gmail.com", "Message from PSSP System", "This email sent by the PSSP system<br />" + ...
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Fit image into ImageView, keep aspect ratio and then resize ImageView to image dimensions?

...nsity); } The xml code for the ImageView: <ImageView a:id="@+id/image_box" a:background="#ff0000" a:src="@drawable/star" a:layout_width="wrap_content" a:layout_height="wrap_content" a:layout_marginTop="20dp" a:layout_gravity="center_horizontal"/> Thanks to this di...
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Reshaping data.frame from wide to long format

...s melt/cast. Here is a solution with reshape, assuming your data frame is called d: reshape(d, direction = "long", varying = list(names(d)[3:7]), v.names = "Value", idvar = c("Code", "Country"), timevar = "Year", times = 1950:1954) ...
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How to track child process using strace?

...ously search for the parent thread, then the grandparent thread, and so on all the way to the root process. 4 Answers ...
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How to style SVG with external CSS?

... want them to have different fill colors, this won't work, but if you want all your paths to be the same, this should work. In your html file, you want something like this: <style> .fill-red { fill: red; } .fill-blue { fill: blue; } </style> <a href="//www.example.com/"> &...
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Get the IP address of the machine

...hould be the same below. I've done a quick example below which will print all of the machine's IPv4 address, (you should also check the getifaddrs was successful ie returns 0). I've updated it show IPv6 addresses too. #include <stdio.h> #include <sys/types.h> #include <ifaddr...
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How do you get the index of the current iteration of a foreach loop?

...or iterating over collections that implement IEnumerable. It does this by calling GetEnumerator on the collection, which will return an Enumerator. This Enumerator has a method and a property: MoveNext() Current Current returns the object that Enumerator is currently on, MoveNext updates Current t...