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HTML table headers always visible at top of window when viewing a large table
...weak" an HTML table's presentation to add a single feature: when scrolling down through the page so that the table is on the screen but the header rows are off-screen, I would like the headers to remain visible at the top of the viewing area.
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Persistence unit as RESOURCE_LOCAL or JTA?
... RESOURCE_LOCAL is fine. This would use basic JDBC-level transactions. The downside is that the transaction is local to the JPA persistence unit, so if you want a transaction that spans multiple persistence units (or other databases), then RESOURCE_LOCAL may not be good enough.
JTA is also used for...
Pointer arithmetic for void pointer in C
.... If a void pointer which points to data of size x is incremented, how does it get to point x bytes ahead? How does the compiler know to add x to value of the pointer?
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Create a new object from type parameter in generic class
...the type information erased, you can't use T to new up an object.
You can do this in a non-generic way by passing the type into the constructor.
class TestOne {
hi() {
alert('Hi');
}
}
class TestTwo {
constructor(private testType) {
}
getNew() {
return new thi...
Running Composer returns: “Could not open input file: composer.phar”
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If you followed instructions like these:
https://getcomposer.org/doc/00-intro.md
Which tell you to do the following:
$ curl -sS https://getcomposer.org/installer | php
$ mv composer.phar /usr/local/bin/composer
Then it's likely that you, like me, ran those commands and didn't read the ...
Validation of radio button group using jQuery validation plugin
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With newer releases of jquery (1.3+ I think), all you have to do is set one of the members of the radio set to be required and jquery will take care of the rest:
<input type="radio" name="myoptions" value="blue" class="required"> Blue<br />
<input type="radio" name="myop...
PHP: Return all dates between two dates in an array [duplicate]
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Note that this doesn't quite get you an array of DateTime objects; it gets you a DatePeriod object that implements the Traversable interface. If you were just planning on iterating over a list of dates with foreach, great; but otherwise, yo...
JavaScript: Object Rename Key
...
The most complete (and correct) way of doing this would be, I believe:
if (old_key !== new_key) {
Object.defineProperty(o, new_key,
Object.getOwnPropertyDescriptor(o, old_key));
delete o[old_key];
}
This method ensures that the renamed property ...
If Python is interpreted, what are .pyc files?
...wever, when I look at my Python source code I see .pyc files, which Windows identifies as "Compiled Python Files".
1...
Binary Data in MySQL [closed]
How do I store binary data in MySQL ?
9 Answers
9
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