A class that takes a required dependency as a constructor argument can only be instantiated if that argument is provided (you should have a guard clause to make sure the argument is not null) (or use a non-nullable type in Kotlin). A constructor therefore enforces the dependency requirement whether or not you’re using Spring, making … Read more
I’ve run into this issue myself. The key to a solution is that the function po::store populates the variables_map while po::notify raises any errors encountered, so vm can be used prior to any notifications being sent. So, as per Tim, set each option to required, as desired, but run po::notify(vm) after you’ve dealt with the … Read more
RequiredIf validation attribute I’ve written a RequiredIfAttribute that requires a particular property value when a different property has a certain value (what you require) or when a different property has anything but a specific value. This is the code that may help: /// <summary> /// Provides conditional validation based on related property value. /// </summary> … Read more
This was a little tricky but I’ve set up this exmaple: http://jsfiddle.net/c5aTe/ which is working for me. Basically the trick seems to be getting around having placeholder text which is invalid. Otherwise you should be able do this: input:required { box-shadow:none; } input:invalid { box-shadow:0 0 3px red; } or something similar… BUT since FF4 … Read more
AngularJS form elements look for the required attribute to perform validation functions. ng-required allows you to set the required attribute depending on a boolean test (for instance, only require field B – say, a student number – if the field A has a certain value – if you selected “student” as a choice) As an … Read more
Mandatory: Have the first value empty – required works on empty values Prerequisites: correct html5 DOCTYPE and a named input field <select name=”somename” required> <option value=””>Please select</option> <option value=”one”>One</option> </select> As per the documentation (the listing and bold is mine) The required attribute is a boolean attribute. When specified, the user will be required to … Read more
TL;DR: Set the required attribute for at least one input of the radio group. Setting required for all inputs is more clear, but not necessary (unless dynamically generating radio-buttons). To group radio buttons they must all have the same name value. This allows only one to be selected at a time and applies required to … Read more