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The controller responds to the user input and performs interactions on the data model objects. The controller receives the input, optionally validates it and then passes the input to the model. As with other software patterns, MVC expresses the "core of the solution" to a problem while allowing it to be adapted for each system. [38]
On December 4, 2018, Flutter 1.0 was released at the Flutter conference in London. [31] On May 6, 2020, the Dart software development kit version 2.8 and Flutter 1.17.0 were released, adding support for the Metal API. [32] On March 3, 2021, Google released Flutter 2 during an online Flutter Engage event.
On January 31, 2012, Bootstrap 2 was released, which added built-in support for Glyphicons, several new components, as well as changes to many of the existing components. This version supports responsive web design , meaning the layout of web pages adjusts dynamically, taking into account the characteristics of the device used (whether desktop ...
The concept of a "web application" was first introduced in the Java language in the Servlet Specification version 2.2, which was released in 1999. At that time, both JavaScript and XML had already been developed, but the XMLHttpRequest object had only been recently introduced on Internet Explorer 5 as an ActiveX object.
An example of this is the val() method, which returns the current value of a text input element. In these cases, a statement such as $('#user-email').val() cannot be used for chaining as the return value does not reference a jQuery object.
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Mobile UI designers consider constraints, contexts, screen space, input methods, and mobility as outlines for design. Constraints in mobile UI design, which include the limited attention span of the user and form factors such as a mobile device's screen size for a user's hand(s).