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How can I get all the request headers in Django?
...ng HTTP_ part. Is this possible through lambda functions? (I think they're called lambda functions) I'm asking this because I would probably go on do it the long way by first iterating over them, then checking to see if it begins with a HTTP_ and then adding it to the new dictionary. Thanks again.
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Testing if a checkbox is checked with jQuery
...rs (omits the variable assignment). Just to clarify:
// this structure is called a ternary operator
var cbAns = ( $("#ans").is(':checked') ) ? 1 : 0;
It works like this:
var myVar = ( if test goes here ) ? 'ans if yes' : 'ans if no' ;
Example:
var myMath = ( 1 > 2 ) ? 'yes' : 'no' ;
alert...
Can we pass parameters to a view in SQL?
...ring must be done outside the view (like "Get all the orders for customers called Miller" or "Get unprocessed orders that came in on Dec 24th").
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Why use String.Format? [duplicate]
...n a single expression it will be converted, by the compiler, into a single call to string.Concat, and there will not be any intermediate strings created. Using a StringBuilder would in fact hurt performance, not help it, since Concat can create an internal buffer of exactly the right size from the ...
jQuery $(“#radioButton”).change(…) not firing during de-selection
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Looks like the change() function is only called when you check a radio button, not when you uncheck it. The solution I used is to bind the change event to every radio button:
$("#r1, #r2, #r3").change(function () {
Or you could give all the radio buttons the sam...
CHECK constraint in MySQL is not working
...END$$
DELIMITER ;
Prior to MySQL 5.5 you had to cause an error, e.g. call a undefined procedure.
In both cases this causes an implicit transaction rollback.
MySQL does not allow the ROLLBACK statement itself within procedures and triggers.
If you don't want to rollback the transaction ( INSERT...
Numbering rows within groups in a data frame
...n plyr and dplyr as explained in this post It can be avoided by explicitly calling dplyr::mutate(...)
– EcologyTom
Apr 10 '18 at 14:16
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What's the difference between lapply and do.call?
I'm learning R recently and confused by two function: lapply and do.call . It seems that they're just similar to map function in Lisp. But why are there two functions with such a different name? Why doesn't R just use a function called map ?
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Cannot set property 'innerHTML' of null
...load. As that can load before the DOM loads and there's no error. Only its call needs to be.jsfiddle.net/fbz6wLpd/8
– barlop
Jul 26 '19 at 14:30
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Use “ENTER” key on softkeyboard instead of clicking button
...ample from my own code. I have an EditText named addCourseText, which will call the function addCourseFromTextBox when either the enter key or the d-pad is clicked.
addCourseText = (EditText) findViewById(R.id.clEtAddCourse);
addCourseText.setOnKeyListener(new OnKeyListener()
{
public boolean o...