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How to wait until an element exists?

...atch the DOM. It's only supported in newer browsers though, so you should fall back onto DOMNodeInserted when MutationObserver isn't available. let observer = new MutationObserver((mutations) => { mutations.forEach((mutation) => { if (!mutation.addedNodes) return for (let i = 0; i &...
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Java: Calling a super method which calls an overridden method

... The keyword super doesn't "stick". Every method call is handled individually, so even if you got to SuperClass.method1() by calling super, that doesn't influence any other method call that you might make in the future. That means there is no direct way to call SuperClass.m...
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JavaScript hard refresh of current page

...aScript? Hard refresh means getting a fresh copy of the page AND refresh all the external resources (images, JavaScript, CSS, etc.). ...
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Android webview slow

... I have noticed that turning off hardware acceleration actually makes my app faster. With android:hardwareAccelerated="true" CSS 3D animations had long delays before they started, scrolling of DIVs inside other scrollable DIVs didn't work, and the app was more unstable. ...
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How to obtain the number of CPUs/cores in Linux from the command line?

... Note that both of these will end up counting twice as many cores as actually exist if you're on a system with hyperthreading (e.g, P4, or Core i7). – duskwuff -inactive- Jun 26 '11 at 0:04 ...
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What is the simplest way to convert a Java string from all caps (words separated by underscores) to

The title pretty much says it all. What's the simplest/most elegant way that I can convert, in Java, a string from the format "THIS_IS_AN_EXAMPLE_STRING" to the format " ThisIsAnExampleString "? I figure there must be at least one way to do it using String.replaceAll() and a regex. ...
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Reading a huge .csv file

... You are reading all rows into a list, then processing that list. Don't do that. Process your rows as you produce them. If you need to filter the data first, use a generator function: import csv def getstuff(filename, criterion): with ...
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UnicodeEncodeError: 'ascii' codec can't encode character u'\xa0' in position 20: ordinal not in rang

...read the Python Unicode HOWTO. This error is the very first example. Basically, stop using str to convert from unicode to encoded text / bytes. Instead, properly use .encode() to encode the string: p.agent_info = u' '.join((agent_contact, agent_telno)).encode('utf-8').strip() or work entirely i...
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JPA: what is the proper pattern for iterating over large result sets?

...er way to iterate over a query against that table, such that I don't have all an in-memory List with millions of objects? ...
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How can I check if an element exists in the visible DOM?

...f the browser's selecting method, and checking it for a truthy value (generally). For example, if my element had an id of "find-me", I could simply use... var elementExists = document.getElementById("find-me"); This is specified to either return a reference to the element or null. If you must ha...