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Preloading images with JavaScript
Is the function I wrote below enough to preload images in most, if not all, browsers commonly used today?
14 Answers
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Cross-Origin Request Headers(CORS) with PHP headers
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Access-Control-Allow-Headers does not allow * as accepted value, see the Mozilla Documentation here.
Instead of the asterisk, you should send the accepted headers (first X-Requested-With as the error says).
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Is it expensive to use try-catch blocks even if an exception is never thrown?
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try has almost no expense at all. Instead of doing the work of setting up the try at runtime, the code's metadata is structured at compile time such that when an exception is thrown, it now does a relatively expensive operation of walking up the stack an...
Flexbox and Internet Explorer 11 (display:flex in ?)
...youts and use CSS flexbox for future projects. I was delighted to see that all major browsers in their current versions seem to support (in one way or another) flexbox.
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Unit Testing AngularJS directive with templateUrl
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You're correct that it's related to ngMock. The ngMock module is automatically loaded for every Angular test, and it initializes the mock $httpBackend to handle any use of the $http service, which includes template fetching. The template system tries to load the template through $http and it become...
C# Sort and OrderBy comparison
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I think, it's much different of sorting a very small list (3 items) 1000000 times, or by sorting a very large list (1000000 items) just a few times. Both is very relevant. In practice, medium size of list (what's medium? ... let's say 1000 items for now) is most interesting...
Trouble comparing time with RSpec
...olution. I think it's easier and more reliable to just create the date manually:
it "updates updated_at attribute" do
freezed_time = Time.utc(2015, 1, 1, 12, 0, 0) #Put here any time you want
Timecop.freeze(freezed_time) do
patch :update
@article.reload
expect(@article.updated_at).t...
What is the difference between Polymer elements and AngularJS directives?
...js is a library that contains several polyfills for various W3C APIs that fall under the Web Components umbrella. These are:
Custom Elements
HTML Imports
<template>
Shadow DOM
Pointer Events
others
The left-nav in the documentation (polymer-project.org) has a page for all of these "Platfor...
How to extract the decision rules from scikit-learn decision-tree?
...sion of sklearn, because some values of tree.tree_.feature are -2 (specifically for leaf nodes).
There is no need to have multiple if statements in the recursive function, just one is fine.
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How to read if a checkbox is checked in PHP?
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this is the really good form to do this in pure simple php. but have to note that the value of a checkbox is string on when it is activated an a inexisting value if it is checked.
– Elvis Technologies
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