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Best way to detect when a user leaves a web page?
...ent: It is fired just before the page is unloaded. It also allows you to ask back if the user really wants to leave. See the demo onbeforeunload Demo.
Alternatively, you can send out an Ajax request when he leaves.
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Subtract two variables in Bash
...s of files between two directories but the COUNT= expression does not work. What is the correct syntax?
8 Answers
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How to set cursor position in EditText?
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NotACleverManNotACleverMan
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Undo a Git merge that hasn't been pushed yet
...ever pushed the changes to origin master. I didn't mean to merge, so I'd like to undo it. When doing a git status after my merge, I was getting this message:
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How to delete selected text in the vi editor
...linewise selection mode, then move the cursor down using j (yes, use h, j, k and l to move left, down, up, right respectively, that's much more efficient than using the arrows) and type d to delete the selection.
Also, how can I select the lines using my keyboard as I can in Windows where I pre...
How to make a background 20% transparent on Android
How do I make the background of a Textview about 20% transparent (not fully transparent), where there is a color in the background (i.e. white)?
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Custom Drawable for ProgressBar/ProgressDialog
...oogle has provided, I get the feeling that it is possible to change the look (drawable) of a ProgressBar/ProgressDialog by simply creating a new style an assigning it to the style property of the ProgressBar. But I cannot get this to work properly. Here is what I did so far:
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A Space between Inline-Block List Items [duplicate]
Why do the inline-block list items have a space in them? No matter how I make my list items into a menu, I always get spaces.
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Max length for client ip address [duplicate]
...Pv6 addresses in this format.
Edit: However, there is a caveat, see @Deepak's answer for details about IPv4-mapped IPv6 addresses. (The correct maximum IPv6 string length is 45 characters.)
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Determining if a number is either a multiple of ten or within a particular set of ranges
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For the first one, to check if a number is a multiple of use:
if (num % 10 == 0) // It's divisible by 10
For the second one:
if(((num - 1) / 10) % 2 == 1 && num <= 100)
But that's rather dense, and you might be better off just listing...