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How does “304 Not Modified” work exactly?
... @VenomVendor: ETag is just a field where the server can store a unique ID (typically a hash or version number or vector clock). It doesn't help you calculate that ID at all; that's up to your server-side code.
– SLaks
Jan 7 '14 at 18:24
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What does SQL clause “GROUP BY 1” mean?
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SELECT account_id, open_emp_id
^^^^ ^^^^
1 2
FROM account
GROUP BY 1;
In above query GROUP BY 1 refers to the first column in select statement which is
account_id.
You also can specify in ORDER BY....
How to select an option from drop down using Selenium WebDriver C#?
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Did you try other drivers or just Firefox? Also, the package's technical name is currently Selenium.Support.
– Dan Csharpster
Apr 21 '19 at 12:58
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Scheduling recurring task in Android
...timer.scheduleAtFixedRate(new TimerTask() {
synchronized public void run() {
\\ here your todo;
}
}}, TimeUnit.MINUTES.toMillis(1), TimeUnit.MINUTES.toMillis(1));
Timer has some drawbacks that are solved by ScheduledThreadPoolExecutor. So it's not the best...
'printf' vs. 'cout' in C++
...cription is placeholder, the code would look like this. Both examples work identically (well, sort of, std::endl actually flushes the buffer).
printf("Error %d: %s.\n", id, errors[id]);
std::cout << "Error " << id << ": " << errors[id] << "." << std::endl;
Whil...
Regex using javascript to return just numbers
...'.match( numberPattern )
This would return an Array with two elements inside, '102' and '1948948'. Operate as you wish. If it doesn't match any it will return null.
To concatenate them:
'something102asdfkj1948948'.match( numberPattern ).join('')
Assuming you're not dealing with complex decimal...
What's the best way to communicate between view controllers?
...ects when appropriate (per the MVC design pattern). Usually you want to avoid putting state information inside a controller, unless it's strictly "presentation" data.
Second, see page 10 of the Stanford presentation for an example of how to programmatically push a controller onto the navigation con...
How to check if element exists using a lambda expression?
...I have TabPane, and I would like to know if there is element with specific ID in it.
3 Answers
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Using JQuery to check if no radio button in a group has been checked
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var len = $('#your_form_id input:radio:checked').length;
if (!len) {
alert("None checked");
};
alert("checked: "+ len);
share
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HTML select form with option to enter custom value
... datalist. Then you add a list attribute to the input, with a value of the id of the datalist.
Update: As of March 2019 all major browsers (now including Safari 12.1 and iOS Safari 12.3) support datalist to the level needed for this functionality. See caniuse for detailed browser support.
It looks...