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Apache Velocity first released in April 2001, is a Java-based template engine that provides a template language to reference objects defined in Java code. It aims to ensure clean separation between the presentation tier and business tiers in a Web application (the model–view–controller design pattern).
HTML can be embedded directly in Hop code. HTML generated on the server (Line 2–14) is passed to the client. HTML generated on the client can be added to the page using the standard DOM API (Line 6). Hop supports bidirectional communication between a running server and a running client instance through its standard library.
The most widespread use of multitier architecture is the three-tier architecture (for example, Cisco's Hierarchical internetworking model). N-tier application architecture provides a model by which developers can create flexible and reusable applications. By segregating an application into tiers, developers acquire the option of modifying or ...
A template processor (also known as a template engine or template parser) is software designed to combine templates with data (defined by a data model) to produce resulting documents or programs. [ 2 ] [ 3 ] [ 4 ] The language that the templates are written in is known as a template language or templating language.
The HTML code provides a "target" to insert generated contents into. Provide a template named "president-template". Last is a function grasping the JSON data, and for each president's subitem, grasping one template and filling it to finally select the HTML page's target appending the whole to it.
Rather, it is a description or a template for solving a particular type of problem that can be deployed in many different situations. [2] Design patterns can be viewed as formalized best practices that the programmer may use to solve common problems when designing a software application or system.
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The client on web applications is a web browser that runs HTML generated by the application layer. [11] [12] The term should not be confused with MVC, where, unlike in three-tier architecture, it is considered a good practice to keep business logic away from the controller, the "middle layer". [13] [14]