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HTML form: select onselect Fires when a user selects some text in a text field, including input and textarea Yes No change onchange Fires when a control loses the input focus and its value has been modified since gaining focus Yes No submit onsubmit Fires when a form is submitted Yes Yes reset onreset Fires when a form is reset Yes No focus onfocus
console. log (a || b); // if a is true, return a, otherwise return b console. log (a && b); // if a is false, return a, otherwise return b Programmers who are more familiar with the behavior in C might find this feature surprising, but it allows for a more concise expression of patterns like null coalescing :
The API's return message is diverted into a hidden <iframe> element, whose onLoad event then triggers the function that displays the success message and hides the main questionnaire (thus "faking" an asynchronous AJAX call – this is necessary because a normal AJAX call cannot access file upload data). The second <form> element, <form id ...
Diagram of a double POST problem encountered in user agents. Diagram of the double POST problem above being solved by PRG. Post/Redirect/Get (PRG) is a web development design pattern that lets the page shown after a form submission be reloaded, shared, or bookmarked without ill effects, such as submitting the form another time.
Some designs, notably some Forth implementations, used two separate stacks, one mainly for control information (like return addresses and loop counters) and the other for data. The former was, or worked like, a call stack and was only indirectly accessible to the programmer through other language constructs while the latter was more directly ...
Setting a user's login shell to false, in /etc/passwd, effectively denies them access to an interactive shell, but their account may still be valid for other services, such as FTP. (Although /sbin/nologin , if available, may be more fitting for this purpose, as it prints a notification before terminating the session.)
The value range form is as follows: for i from f by b to t while w do # loop body od; All parts except do and od are optional. The for I part, if present, must come first. The remaining parts (from f, by b, to t, while w) can appear in any order. Iterating over a container is done using this form of loop: for e in c while w do # loop body od;
In some programming language environments (at least one proprietary Lisp implementation, for example), [citation needed] the value used as the null pointer (called nil in Lisp) may actually be a pointer to a block of internal data useful to the implementation (but not explicitly reachable from user programs), thus allowing the same register to be used as a useful constant and a quick way of ...