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What is a NullPointerException, and how do I fix it?
... community wiki
11 revs, 7 users 85%Stephen C
Image resizing client-side with JavaScript before upload to the server
...
Here's a gist which does this:
https://gist.github.com/dcollien/312bce1270a5f511bf4a
(an es6 version, and a .js version which can be included in a script tag)
You can use it as follows:
<input type="file" id="select">
<img id="preview">
<script>
document.getElementById('select'...
How many files can I put in a directory?
...rformance hit on displaying the file. e.g. www.website.com/thumbdir/gh3hg4h2b4h234b3h2.jpg has a wait time of 200-400 ms. As a comparison on another site I have with a around 100 files in a directory the image is displayed after just ~40ms of waiting.
I've given this answer as most people have just...
Generate a heatmap in MatPlotLib using a scatter data set
...import cm as CM
from matplotlib import mlab as ML
import numpy as NP
n = 1e5
x = y = NP.linspace(-5, 5, 100)
X, Y = NP.meshgrid(x, y)
Z1 = ML.bivariate_normal(X, Y, 2, 2, 0, 0)
Z2 = ML.bivariate_normal(X, Y, 4, 1, 1, 1)
ZD = Z2 - Z1
x = X.ravel()
y = Y.ravel()
z = ZD.ravel()
gridsize=30
PLT.subplot...
Why do I need an IoC container as opposed to straightforward DI code? [closed]
... community wiki
8 revs, 7 users 85%Ben Scheirman
28
...
How to properly URL encode a string in PHP?
...= ['%21', '%2A', '%27', '%28', '%29', '%3B', '%3A', '%40', '%26', '%3D', '%2B', '%24', '%2C', '%2F', '%3F', '%25', '%23', '%5B', '%5D'];
$replacements = ['!', '*', "'", "(", ")", ";", ":", "@", "&", "=", "+", "$", ",", "/", "?", "%", "#", "[", "]"];
return str_rep...
Difference between add(), replace(), and addToBackStack()
...oy() App is closed, nothing is visible
Case 2B - adding, replacing, removing, and clicking Back button
Activity : onCreate() - onStart() - onResume() Activity is visible
add Fragment A : onAttach() - onCreate() - onCreateView() - on...
Rounded table corners CSS only
...n;
border-radius: 10px;
-pie-background: linear-gradient(#ece9d8, #E5ECD8);
box-shadow: #666 0px 2px 3px;
behavior: url(Include/PIE.htc);
overflow: hidden;
}
Don't worry if your Visual Studio CSS intellisense gives you the green underline for unknown properites, it still wor...
What is the best way to trigger onchange event in react js
... event.
https://github.com/jquense/react/blob/9a93af4411a8e880bbc05392ccf2b195c97502d1/src/renderers/dom/client/eventPlugins/ChangeEventPlugin.js#L128
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Moving average or running mean
... more points you accumulate over the greater the floating point error (so 1e5 points is noticable, 1e6 points is more significant, more than 1e6 and you may want to resetting the accumulators)
you can cheat by using np.longdouble but your floating point error still will get significant for relativel...