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Warn user before leaving web page with unsaved changes
... to show this message when the user hasn't changed anything on your forms. One solution is to use the beforeunload event in combination with a "dirty" flag, which only triggers the prompt if it's really relevant.
var isDirty = function() { return false; }
window.onload = function() {
window.a...
How do I test which class an object is in Objective-C?
... the advantage to using class_getName over NSStringFromClass? If there is none, this answer should be adjusted.
– Dan Rosenstark
Aug 20 '13 at 1:04
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Unsigned keyword in C++
...can be modified using the keywords signed, unsigned, short, and long. When one of these type modifiers is used by itself, a data type of int is assumed
This means that you can assume the author is using ints.
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What are the aspect ratios for all Android phone and tablet devices?
...looking for a list of all screen aspect ratios for popular Android based Phones and Tablets.
5 Answers
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Spark java.lang.OutOfMemoryError: Java heap space
...distributed single-JVM deployment mode, Spark spawns all the execution components - driver, executor, backend, and master - in the same JVM. This is the only mode where a driver is used for execution.
Thus, if you are experiencing OOM errors with the heap, it suffices to adjust the driver-memory r...
What does 'wb' mean in this code, using Python?
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Great explanation. One clarification, however: you say "Text mode should therefore be used when writing text files". For completeness I'd refer back to your earlier comment that "Python makes no changes [in binary mode]", and add that you would...
NULL vs nil in Objective-C
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You can. void * is any pointer. Nonetheless, you are absolutely right that NULL is the correct constant there.
– Peter Hosey
Feb 17 '09 at 18:16
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What is a practical use for a closure in JavaScript?
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The example you give is an excellent one. Closures are an abstraction mechanism that allow you to separate concerns very cleanly. Your example is a case of separating instrumentation (counting calls) from semantics (an error-reporting API). Other uses include:
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Can I update a component's props in React.js?
...eems like props are intended to be static (passed in from the parent component), while state changes based upon events. However, I noticed in the docs a reference to componentWillReceiveProps , which specifically includes this example:
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What exactly is Apache Camel?
...ose between mule ESB & Camel. what should be my demacation on choosing one ove the other
– kuhajeyan
Jan 7 '13 at 9:11
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