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How Can I Effectively Structure Go Templates in App Engine for Hierarchy, Easy Editing, and Automatic Reloading?
How Can I Effectively Structure Go Templates in App Engine for Hierarchy, Easy Editing, and Automatic Reloading?
Structuring Go Templates in AppEngine Applications for Hierarchies, Editing, and Reloading
This article delves into the structuring of templates in Go-based AppEngine applications, addressing hierarchical structures, ease of editing, and automatic template reloading.
Hierarchical Structure
To create a hierarchical structure for templates, it's recommended to store templates in the root directory of your package, under a dedicated templates subdirectory. This allows for organized organization and simplifies traversal by template.ParseFiles().
Ease of Editing
Embedding template text in .go files can hinder editing using HTML tools. To resolve this, store templates as raw text files in the templates subdirectory. While it's recommended not to upload templates directly due to performance concerns, there are alternative approaches.
Automatic Reloading
Automatic template reloading on the dev server can be achieved by defining a package-level template variable. This variable is populated during package initialization and updated on any template changes.
Example Project Structure
Consider the following project structure:
|-- app.yaml
|-- app
| +-- http.go
|-- templates
| +-- base.html
+-- github.com
+-- storeski
+-- appengine
|-- products
| +-- http.go
| +-- templates
| |-- list.html
| |-- detail.html
+-- account
|-- http.go
+-- templates
|-- overview.html
|-- notifications.html Modular Approach with Package Ownership
The recommended approach involves using packages to handle specific URL prefixes. Each package owns a dedicated templates subdirectory where its templates reside. This modularity allows for template handling specific to the package's functionality.
Extending a Base Template
To maintain consistency, establish a base template that other templates can extend. For instance, you can define a templates/base.html template and have other templates inherit from it using the extended template function.
Code Example
Here's an example of defining a base template and parsing additional templates within a handler:
templates/base.html
<!DOCTYPE HTML> <html> <head>
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