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How can I check if an element exists in the visible DOM?
...w do you test an element for existence without the use of the getElementById method?
25 Answers
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How can I see the SQL that will be generated by a given ActiveRecord query in Ruby on Rails
...ion statement just by putting ".to_sql" at the end. This question also provides that answer: stackoverflow.com/questions/3814738/…
– Steve Midgley
Sep 17 '14 at 5:03
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Is is possible to check if an object is already attached to a data context in Entity Framework?
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Here's what I ended up with, which works very nicely:
public static void AttachToOrGet<T>(this ObjectContext context, string entitySetName, ref T entity)
where T : IEntityWithKey
{
ObjectStateEntry entry;
// Track whether we need to perform an attach
bool attach = false;
...
What is Normalisation (or Normalization)?
...y to design a database schema such that duplicate and redundant data is avoided. If some piece of data is duplicated several places in the database, there is the risk that it is updated in one place but not the other, leading to data corruption.
There is a number of normalization levels from 1. no...
What does the LayoutInflater attachToRoot parameter mean?
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I'm a bit confused here, @JosephEarl you said if set to true, the view is attached to 2nd parameter which is the container, but then you say fragment is automatically attached from onCreateView(), so to my understanding, third parameter is useless and should be set fa...
how to replicate pinterest.com's absolute div stacking layout [closed]
... would like the results sorted left to right. Any direction you could provide to make it myself would be greatly appreciated.
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REST API Authentication
...fer following on how to implement:
Working Link from comments: https://www.ida.liu.se/~TDP024/labs/hmacarticle.pdf
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SQLiteDatabase.query method
... null, null, orderBy);
// since we have a named column we can do
int idx = c.getColumnIndex("max");
is equivalent to the following raw query
String queryString =
"SELECT column1, (SELECT max(column1) FROM table1) AS max FROM table1 " +
"WHERE column1 = ? OR column1 = ? ORDER BY colu...
cartesian product in pandas
...e cartesian product on.
My use case was that I needed a list of all store IDs on for each week in my list. So, I created a list of all the weeks I wanted to have, then a list of all the store IDs I wanted to map them against.
The merge I chose left, but would be semantically the same as inner in t...
Strangest language feature
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In JavaScript, the following construct
return
{
id : 1234,
title : 'Tony the Pony'
};
returns undefined is a syntax error due to the sneaky implicit semicolon insertion on the newline after return. The following works as you would expect though:
return {
id : 12...