Angularjs multiple scope: In case of multiple controllers AngularJS framework creates and pass a different $scope object to each controller so that data and methods of one controller not be accessed in another controller. Example Explanation: First include the AngularJS library in the application. The ng-app directive initializes the application. The ng-model directive binds (two … Read more
AngularJS Scope: AngularJS Scope is a special JavaScript object which transfers data from the controller to view and vice-versa. AngularJS Scope is represented by $scope which contains application data and methods. We can define properties and functions in $scope object inside controller. AngularJS Scope: Example Explanation: First include the AngularJS library in the application. … Read more
JSF provides system event listeners to handle application events which fired when application start or stop or during JSF lifecycle. JSF application events: Application Event Description PostConstructApplicationEvent JSF fires PostConstructApplicationEvent when application starts. It can be used to perform initialization tasks after application has started. PreDestroyApplicationEvent JSF fires PreDestroyApplicationEvent when application is about to shut … Read more
JSF fired action events when user clicks on a button or link component like h:commandButton or h:commandLink etc. An action event can be handled by following ways: 1. Method Binding. 2. ActionListener Interface. Method Binding: Use the managed bean method directly into actionListener attribute of the corresponding JSF component. Bean class: @ManagedBean(name="testBean") @SessionScoped public class … Read more
JSF fired value change events when user make changes in input components like h:inputText or h:selectOneMenu etc. A value change event can be handled by following ways: 1. Method Binding. 2. ValueChangeListener Interface. Method Binding: Use the managed bean method directly into valueChangeListener attribute of the corresponding JSF component. Bean class: @ManagedBean(name="testBean") @SessionScoped public class … Read more
Event: Happening of something is known as an event. JSF event handling: In JSF when a button is clicked or change value in text filed etc then corresponding JSF component create an instance of the corresponding event class and adds the event to the event list. After adding the event in the event list JSF … Read more
Let us discuss how to create custom validator in JSF with example. Steps to create custom validator in JSF: 1. First create a validator class by implementing javax.faces.validator.Validator interface 2. Override validate() method of above interface. 3. Assign a unique validator ID to the custom validator by using @FacesValidator annotation. 4. Use custom validator class … Read more
JSF f validateRequired tag: JSF f:validateRequired tag is used to validate that the input field is not empty. Syntax: <f:validateRequired /><f:validateRequired /> Example: test.xhtml <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core"> <h:head> <title>JSF f validate required example.</title> </h:head> <h:body> <h2>JSF f validate required example.</h2> <h:form> … Read more
JSF f validateRegex tag: JSF f: validateRegex tag is used to validate JSF component with a given regular expression pattern. Syntax: <f:validateRegex pattern="regularExpressionPatern" /><f:validateRegex pattern="regularExpressionPatern" /> JSF f validateRegex tag attribute: Attribute Description pattern Formatting pattern Example: test.xhtml <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core"> <h:head> … Read more
JSF f validateDoubleRange tag: JSF f: validateDoubleRange tag is used to validate the range of a float value. Syntax: <f:validateDoubleRange minimum="m.a" maximum="n.b" /><f:validateDoubleRange minimum="m.a" maximum="n.b" /> JSF f validateDoubleRange tag attribute: Attribute Description 1. minimum It specify minimum double value within an optional range 2. maximum It specify maximum double value within an optional range … Read more