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How do I auto-hide placeholder text upon focus using css or jquery?
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<input
type="text"
placeholder="enter your text"
onfocus="this.placeholder = ''"
onblur="this.placeholder = 'enter your text'" />
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What's the purpose of SQL keyword “AS”?
...specially when there doesn't seem to be much to separate the choices, consult a book on heuristics. As far as I know, the only heuristics book for SQL is 'Joe Celko's SQL Programming Style':
A correlation name is more often
called an alias, but I will be formal.
In SQL-92, they can have an o...
Django - iterate number in for loop of a template
...tarting index 0
# do your stuff
{% endfor %}
More info at: for | Built-in template tags and filters | Django documentation
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Is List a subclass of List? Why are Java generics not implicitly polymorphic?
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No, a List<Dog> is not a List<Animal>. Consider what you can do with a List<Animal> - you can add any animal to it... including a cat. Now, can you logically add a cat to a litter of puppies? Absolutely not.
// Illega...
How to set DialogFragment's width and height?
...create();
}
You can also set ThemeOverlay.AppCompat.Dialog as the default theme when creating your dialogs, by adding it to your app's xml theme.
Be careful, as many dialogs do need the default minimum width to look good.
<!-- Base application theme. -->
<style name="AppTheme" parent="...
What are the advantages of using nullptr?
...se, that is not the only advantage of nullptr. Here is another:
template<typename T, T *ptr>
struct something{}; //primary template
template<>
struct something<nullptr_t, nullptr>{}; //partial specialization for nullptr
Since in template, the type of nullp...
Instantiating a generic class in Java [duplicate]
...er type you're interested in - any way of specifying the appropriate Class<T> reference) and keep that value as a field:
public class Test {
public static void main(String[] args) throws IllegalAccessException,
InstantiationException {
Generic<Bar> x = new Generi...
Using LINQ to remove elements from a List
...authorsList instead of removing the authors from the previous collection. Alternatively, you can use RemoveAll:
authorsList.RemoveAll(x => x.FirstName == "Bob");
If you really need to do it based on another collection, I'd use a HashSet, RemoveAll and Contains:
var setToRemove = new HashSet&l...
WCF - How to Increase Message Size Quota
... increase the message size quotas, in the App.config or Web.config file:
<bindings>
<basicHttpBinding>
<binding name="basicHttp" allowCookies="true"
maxReceivedMessageSize="20000000"
maxBufferSize="20000000"
maxBufferPoo...
How can I center an absolutely positioned element in a div?
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<body>
<div style="position: absolute; left: 50%;">
<div style="position: relative; left: -50%; border: dotted red 1px;">
I am some centered shrink-to-fit content! <br />
tum te tu...