Templatingteknikker

Templatingteknikker are methods used to generate text or markup from templates by combining a static template with dynamic data. They play a central role in web development, document generation, and email campaigns by separating content from presentation and enabling automated production of pages, messages, or reports.

Templates differ in where rendering happens: server-side templates are processed on a back-end before sending output to clients, while client-side templates render in the browser using data from APIs. Most templating systems use placeholders for data, and offer features such as conditionals, loops, and include/partial templates to compose complex output. Some templates are logicless, emphasizing data binding and simple syntax; others provide richer programming constructs and filters.

Common techniques include: variable interpolation, sections or loops to repeat blocks for arrays, conditionals, and template inheritance or includes to reuse layouts. Partials or macros let templates be composed of reusable components. Patterns such as escaping handlers are used to prevent cross-site scripting and other injection risks. Precompilation and caching improve performance.

Examples of templating engines and formats include Mustache, Handlebars, Jinja2, Django templates, EJS, Liquid and Pug. Although names vary by language, the underlying ideas—data binding, layout composition, and safe rendering—remain similar.

Best practices emphasize keeping templates logic-light, validating and escaping data, avoiding business logic in templates, and testing render outputs with representative data. Security and performance considerations are central to robust templating projects.