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Understanding exactly when a data.table is a reference to (vs a copy of) another data.table
...od does. When wrapped with invisible() or when called within a function or script, the print method isn't called.
All this applies inside functions too; i.e., := and set() do not copy on write, even within functions. If you need to modify a local copy, then call x=copy(x) at the start of the funct...
log4j logging hierarchy order
...messages and java logging level are almost important because you can setup alert on these logging messages in java and let your support team monitor health of your java application and react on this warning messages. In Summary WARN level is used to log warning message for logging in Java.
ERROR is...
jQuery: Test if checkbox is NOT checked
...$(this).is(':checked')) {
//$(this).prop('checked',false);
alert("is checked");
} else {
//$(this).prop('checked',true);
alert("not checked");
}
});
I commented out the way to toggle the checked attribute.
...
How do you return a JSON object from a Java Servlet
...m doing this to send response to javascript and displaying the response in alert. why is it displaying the html code inside the alert..why am i getting the html code as response. i did the exact same thing like you said.
– Abhi
Mar 11 '16 at 4:21
...
Populating a database in a Laravel migration file
...l to consider the long term implications of calling seeders from migration scripts. The migration scripts are date/time versioned, while seeders are typically not. During development, seeder needs often change, resulting in the possibility of versioned migration scripts running non-versioned seeders...
HTML5 record audio to file
...e recorded.
You can view the source of that page to find links to the javascript, but to summarize, there's a Recorder object that contains an exportWAV method, and a forceDownload method.
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CSRF Token necessary when using Stateless(= Sessionless) Authentication?
...rage
User clicks a link, which loads a new page (= a real link, and no javascript content-replace)
You can still access the token from sessionStorage
To logout, you can either manually delete the token from sessionStorage or wait for the user to close the browser window, which will clear all stored ...
How to break out of jQuery each Loop
...groupName').each(function() {
if($(this).text() == groupname){
alert('This group already exists');
breakOut = true;
return false;
}
});
if(breakOut) {
breakOut = false;
return false;
}
...
What is a callback?
...rver code from the
client without performing a postback.
If the client script in the page is
maintaining some state information
(for example, local variable values),
posting the page and getting a new
copy of it destroys that state.
Additionally, page postbacks introduce
processing o...
Accessing the web page's HTTP Headers in JavaScript
How do I access a page's HTTP response headers via JavaScript?
17 Answers
17
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