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How to properly reuse connection to Mongodb across NodeJs application and modules
...rs). You can test it yourself quickly, but I threw a quick pen together to demo: codesandbox.io/s/awesome-water-cexno
– EddieDean
Apr 23 at 5:42
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Efficient way to apply multiple filters to pandas DataFrame or Series
... return df[ops[op](df[col], val)]
pandas.DataFrame.filt_spec = filt_spec
Demo:
df = pd.DataFrame({'a': [1,2,3,4,5], 'b':[5,4,3,2,1]})
df.filt_spec('a', 2, 'ge')
Result:
a b
1 2 4
2 3 3
3 4 2
4 5 1
You can see that column 'a' has been filtered where a >=2.
This is slightly...
Do DOM tree elements with ids become global variables?
...this functionality in standards mode. Microsoft even released a marketing demo that did, preventing the demo from working in Firefox.
Webkit has recently considered the opposite, relegating named access on the window object to quirks mode only. They decided against it by the same reasoning as Gec...
How to convert an enum type variable to a string?
...#include <boost/preprocessor.hpp> line, can be compiled as posted to demonstrate the solution.
This particular solution is for C++ as it uses C++-specific syntax (e.g., no typedef enum) and function overloading, but it would be straightforward to make this work with C as well.
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JavaScript curry: what are the practical applications?
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I have tried to explain it with some example and demos in my written article.
– Zaheer Ahmed
Mar 22 '14 at 15:55
6
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Using the HTML5 “required” attribute for a group of checkboxes?
...
we can do this easily with html5 also, just need to add some jquery code
Demo
HTML
<form>
<div class="form-group options">
<input type="checkbox" name="type[]" value="A" required /> A
<input type="checkbox" name="type[]" value="B" required /> B
<input type="c...
Easiest way to open a download window without navigating away from the page
...ng it this way:
downloadFile('report/xls/myCustomReport.xlsx');
Working Demo:
function downloadFile(filePath) {
var link = document.createElement('a');
link.href = filePath;
link.download = filePath.substr(filePath.lastIndexOf('/') + 1);
link.click();
}
downloadFile("http://w...
Principal component analysis in Python
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PCA using numpy.linalg.svd is super easy. Here's a simple demo:
import numpy as np
import matplotlib.pyplot as plt
from scipy.misc import lena
# the underlying signal is a sinusoidally modulated image
img = lena()
t = np.arange(100)
time = np.sin(0.1*t)
real = time[:,np.newaxis,np...
How to return PDF to browser in MVC?
I have this demo code for iTextSharp
11 Answers
11
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Set opacity of background image without affecting child elements
... absolutely positioned child with a relatively positioned parent.
Check demo at http://www.impressivewebs.com/css-opacity-that-doesnt-affect-child-elements/
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