Input with pattern not working

Most likely because widgets are saved via AJAX, and, as far as I’m aware, the submit handler will bypass any HTML5 input rules unless they are explicitly checked with JavaScript. Your best bet is to validate/sanitize the data server-side, and pass back any messages if there is an input error. Chrome adding =”” is just … Read more

Frontend Category Checkbox

Your select tag doesn’t have a name attribute, it only has a type and value. The name is used as an ID when you POST most likely the reason your data isn’t saving. Quick Example: <form action=”/action_page.php”> <select name=”cars”> <option value=”volvo”>Volvo XC90</option> <option value=”saab”>Saab 95</option> <option value=”mercedes”>Mercedes SLK</option> <option value=”audi”>Audi TT</option> </select> <input type=”submit” value=”Submit”> … Read more

C++ – pointer being freed was not allocated error

Welcome to the exciting world of C++! Short answer: you’re passing Store as a value. All your menu functions should take a Store& or Store* instead. When you’re passing Store as a value then an implicit copy is done (so the mainStore variable is never actually modified). When you return from the function the Store::~Store … Read more

Data Manipulation in R: ‘X’ must be atomic

The problem is that salary_var is a list containing a single-element. The call to sort() is then trying to sort a list, not an atomic element. You can see that salary_var is a list by running str(salary_var). If you omit the c(), you’ll instead end up with a data frame with a single column, which … Read more

What is EOF in the C programming language?

On Linux systems and OS X, the character to input to cause an EOF is Ctrl–D. For Windows, it’s Ctrl–Z. Depending on the operating system, this character will only work if it’s the first character on a line, i.e. the first character after an Enter. Since console input is often line-oriented, the system may also not recognize the … Read more