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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...
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
...
how to draw smooth curve through N points using javascript HTML5 canvas?
...efault tension=0.5
drawCurve(ctx, myPoints, tension);
The function above calls two sub-functions, one to calculate the smoothed points. This returns an array with new points - this is the core function which calculates the smoothed points:
function getCurvePoints(pts, tension, isClosed, numOfSegm...
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
...
Android中Java和JavaScript交互 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...html");
}
private void testMethod(WebView webView) {
String call = "javascript：sayHello()";
call = "javascript：alertMessage(\"" + "content" + "\")";
call = "javascript：toastMessage(\"" + "content" + "\")";
call = "javascript：sumToJava(1,2)";
w...
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...
How to implement the activity stream in a social network
...eveloped by a bunch of well-know people.
http://activitystrea.ms/.
Basically, every activity has an actor (who performs the activity), a verb (the action of the activity), an object (on which the actor performs on), and a target.
For example: Max has posted a link to Adam's wall.
Their JSON's ...
How to use underscore.js as a template engine?
...JsFiddle List grouped by first letter (complex example w/ images, function calls, sub-templates) fork it! have a blast...
JsFiddle Demo of XSS hack noted by @tarun_telang below
JsFiddle One non-standard method to do sub-templates
...
Is there a __CLASS__ macro in C++?
...
The closest thing there's is to call typeid(your_class).name() - but this produces compiler specific mangled name.
To use it inside class just typeid(*this).name()
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