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Make sure only a single instance of a program is running
Is there a Pythonic way to have only one instance of a program running?
20 Answers
20...
Setting “checked” for a checkbox with jQuery
...yCheckbox').prop('checked', false);
DOM API
If you're working with just one element, you can always just access the underlying HTMLInputElement and modify its .checked property:
$('.myCheckbox')[0].checked = true;
$('.myCheckbox')[0].checked = false;
The benefit to using the .prop() and .attr(...
How do you allow spaces to be entered using scanf?
...t maximum buffer size in scanf format, you just can't put runtime computed one without building the format at runtime (there isn't the equivalent of * for printf, * is a valid modificator for scanf with another behavior: suppressing assignation).
– AProgrammer
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INSERT IF NOT EXISTS ELSE UPDATE?
...ould be" solutions for the classic "How do I insert a new record or update one if it already exists" but I cannot get any of them to work in SQLite.
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What would be C++ limitations compared C language? [closed]
...o a current question which asks about a generics library for C - the questioner specifically states that they do not want to use C++.
C is a complete programming language. C is not an arbitrary subset of C++. C is not a subset of C++ at all.
This is valid C:
foo_t* foo = malloc ( sizeof(foo_t) ...
Change key pair for ec2 instance
...i.e. you lost your private key).
If you still have SSH access, please use one of the answers below.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-key-pairs.html#replacing-lost-key-pair
Here is what I did, thanks to Eric Hammond's blog post:
Stop the running EC2 instance
Detach its /de...
Disable Required validation attribute under certain circumstances
...on attribute in certain controller actions. I am wondering this because on one of my edit forms I do not require the user to enter values for fields that they have already specified previously. However I then implement logic that when they enter a value it uses some special logic to update the model...
Find CRLF in Notepad++
...is topic:
"How To Replace Line Ends, thus changing the line layout".
(mentioned by georgiecasey in his/her answer below)
Some relevant extracts includes the following search processes:
Simple search (Ctrl+F), Search Mode = Normal
You can select an EOL in the editing window.
Just m...
How to write a simple Html.DropDownListFor()?
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Hi here is how i did it in one Project :
@Html.DropDownListFor(model => model.MyOption,
new List<SelectListItem> {
new SelectListItem { Value = "0" , Text = "Option A" },
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Are (non-void) self-closing tags valid in HTML5?
... production of void elements or self-closing elements: you can't even have one rule to say write all empty elements as <tag></tag>.
– Bruno
Oct 23 '14 at 16:06
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