An instance of the Text::CSVXS class will combine fields into a CSV string and parse a CSV string into fields. A large radius may display unevenly when using fill="outline" if needed, use shape="round" instead or increase -padding-start. Text::CSVXS provides facilities for the composition and decomposition of comma-separated values. Don't use fetchrowarray in a scalar context unless you really know what you are doing as it can return the first or last column (dependent on the driver) which could be a NULL value and hence undef. undef is not a string or a number, and if used as a string it is equivalent to the empty string, if used as a number it is equivalent to 0 (as is the empty. eq tests if the string form of each value is lexicographically equal. If the input is cleared on edit, the type is null.Ĭolor of the border below the input when using helper text, error text, or counter NOTE that NULL fields are returned as undef in the array returned by fetchrowarray (more about NULL values later). tests if the numeric form of each value is numerically equal. The ionInput event fires when the value of an element has been changed.įor elements that accept text input ( type=text, type=tel, etc.), the interface is InputEvent for others, the interface is Event. When storing the value in a state variable, we recommend updating both the state variable and the ion-input component value. This is useful for filtering out invalid or unwanted characters. When the element loses focus after its value has changed: for elements where the user's interaction is typing. Developers can use the ionInput event to update the input value in response to user input such as a keypress. by selecting a date from a date picker for, pressing the "Enter" key, etc.). Unlike the ionInput event, the ionChange event is not necessarily fired for each alteration to an element's value.ĭepending on the way the users interacts with the element, the ionChange event fires at a different moment: - When the user commits the change explicitly (e.g. The ionChange event is fired for elements when the user modifies the element's value. Developers can set the legacy property on ion-input to true to force that instance of the input to use the legacy syntax. In some instances, it may be preferable to continue using the legacy syntax. Ionic uses heuristics to detect if an app is using the modern input syntax. Provide more context on a input, consider using an IonNote If you use any of these conventions, you will quickly find that the code that you write does not behave as nicely as normal Perl code.Metadata such as counters and helper text should notīe used when an input is in an item/list. (Credit to for the partial list of scalar values accepted as true or false by Perl.)īut given all of these values that are treated as true or false, what should a Perl boolean function return? Plus, array-to-scalar and list-to-scalar conversions mean that you can often get away with using an empty array as a false value. Perl treats the following as true: any other scalar values, 1, -1, a string with a space in it ( ' '), '00' multiple 0s in a string, "0\n" (a '0' followed by a newline), 'true', 'false', 'undef', etc. If you use it in a string operation, it pretends to be the empty string. We all know that Perl is very flexible with regard to booleans, as with most things.įor example, Perl treats the following as false: undef(), the number 0 (even if written as 000 or 0.0), an empty string, '0' (a string containing a single 0 digit). If you use a variable that is undef in a numerical operation, it pretends to be 0. What are the best ways to represent true and false consistently in libraries of Perl code?ġ / the special empty string that Perl's native boolean operators
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